feat(abilities): add Revive

Complete US-012 with consent-based player parties, lifecycle rules, session-bound book controls and current-session native damage protection. Preserve the existing approved inventory/input and read-only book prerequisites without claiming their broader stories complete.

Verify 516 tests with clean and versioned builds; scoped Semgrep and npm audit report no findings. No deployment changes.

.gitea/workflows/ci.yml

@@ -2,6 +2,8 @@ name: CI
 
 on:
   push:
+    branches-ignore: [main]
+    tags-ignore: ['**']
   pull_request:
 
 jobs:

README.md

@@ -1,14 +1,15 @@
 # Fantasy Stick
 
-**Development foundation only. No playable gameplay is registered, and this JAR is not ready for deployment.**
+**Transferable characters and standalone names (US-001), equipment restoration (US-002), inventory safety (US-003), paginated character inspection (US-005), native session health/defeat (US-006), book parties/native damage protection (US-012), and switch delay (US-023) have automated implementation coverage. The full RPG remains in development and is not deployment-ready.**
 
-Fantasy Stick is the proposed transferable-character RPG plugin for Social Minecraft. Its approved design uses Paper character sheets, native equipment storage and a book/basic-stick/seven-ability hotbar. These remain planned native features. The server-independent progression core now tests initial stats/points, stat purchases, CON's equal maximum/current-health gain, capped XP and `MAX` presentation. YAML persistence, backend death/revival transitions and a native signed-book factory are also present. None is yet wired into playable crafting, health, session or spell interactions.
+Fantasy Stick is the proposed transferable-character RPG plugin for Social Minecraft. Its approved design uses Paper character sheets, native equipment storage and a book/basic-stick/seven-ability hotbar. Crafting, native-health offhand sessions, read-only character books and book-managed parties with native damage protection are assembled; active food overrides, stat/ability book actions, combat progression and spells remain incomplete. The server-independent progression core now tests initial stats/points, stat purchases, CON's equal maximum/current-health gain, capped XP and `MAX` presentation. YAML persistence, backend death/revival transitions and a native signed-book factory are also present. Saved-sheet crafting and accepted anvil-name persistence are wired. Stat purchases and spell execution remain incomplete.
 
 ## Build and verify
 
 - Java 25 toolchain (Gradle can resolve it), Gradle wrapper 9.6.1.
 - Purpur API/runtime `26.2.build.2618-stable`; `plugin.yml` declares API `26.2`.
 - Node.js 20 or later and npm for the TypeScript release-tool tests.
+- ProtocolLib **5.4.0** is required at runtime and declared as a compile-only dependency; it is not bundled. Install the official [server distribution](https://github.com/dmulloy2/ProtocolLib/releases/tag/5.4.0), not the Maven library JAR (which lacks bundled runtime dependencies).
 
 ```sh
 ./gradlew clean check jar
@@ -17,7 +18,7 @@ Fantasy Stick is the proposed transferable-character RPG plugin for Social Minec
 
 `check` runs Java packaging tests, TypeScript release-client/credential-helper tests, and a native compatibility test against the checksum-verified Purpur runtime. Native preparation downloads and patches the declared runtime and loads vanilla registries/components **without starting a listening server or creating a gameplay world**. The item tests decode signed written books with Minecraft's real codec, without a plugin instance or YAML lookup. A clean build repeats that preparation. Dependencies and runtime downloads require network access.
 
-Build output is `build/libs/purpur-fantasy-stick-<version>.jar`. Server APIs, tests, credentials, and Node tooling are not bundled in the plugin. Runtime identity is `FantasyStick`, entrypoint `games.dmg.fantasystick.FantasyStickPlugin`, data folder `FantasyStick`, namespace `fantasystick`. Bootstrap registers no commands, permissions, recipes, sessions or gameplay listeners.
+Build output is `build/libs/purpur-fantasy-stick-<version>.jar`. Server APIs, tests, credentials, and Node tooling are not bundled in the plugin. Runtime identity is `FantasyStick`, entrypoint `games.dmg.fantasystick.FantasyStickPlugin`, data folder `FantasyStick`, namespace `fantasystick`. Startup registers the manual crafting controller and automated-Crafter guard before the character-sheet recipe. Equipment sessions and permission-gated administration are registered; spell execution remains absent.
 
 ## Character storage and keepsakes
 
@@ -27,15 +28,93 @@ The file adapter uses safe YAML construction, duplicate-key rejection, bounded r
 
 `CharacterStorage` queues disk operations on its persistence worker and acknowledges successful writes only after commit. Its backend restoration checks the saved dead flag, matching current death ID and death age strictly under 24 hours at the request/selection time. It preserves progress/cooldowns and restores full character health; old books do not become eligible after a later death. This method is **not** a complete Revive spell: the engine must still validate the caster and native dialog, spend its cooldown, recheck item possession and perform physical conversion safely.
 
-`TailBooks` creates vanilla `WRITTEN_BOOK` items with static pages. The full character name remains in display/pages; the native title is bounded to vanilla's 32 UTF-16 units without splitting a surrogate pair. `fantasystick:tail_version`, `character_id` and `death_id` identify the saved record. Pages/title are never read as authoritative stats or revival eligibility. Plugin absence does not remove the vanilla written-book contents. The factory does not yet deliver books from a death event.
+`TailBooks` creates vanilla `WRITTEN_BOOK` items with static pages. The full character name remains in display/pages; the native title is bounded to vanilla's 32 UTF-16 units without splitting a surrogate pair. `fantasystick:tail_version`, `character_id` and `death_id` identify the saved record. Pages/title are never read as authoritative stats or revival eligibility. Plugin absence does not remove the vanilla written-book contents. The equipment coordinator now intercepts active-session native death, restores gear and normal health, attempts the entry-location return, and saves authoritative death before guarded one-book conversion. Stale/offline/uncertain delivery is reported without reissue; this is not the complete Revive spell. Native health/session integration is described below.
 
-File-level atomic replacement is **not** atomicity with Minecraft inventory/player saves. This checkpoint does not implement cross-save reconciliation, an administrator lock, automatic overflow drops or player/session persistence.
+File-level atomic replacement is **not** atomicity with Minecraft inventory/player saves. Player/session receipts and proof-based equipment reconciliation are implemented below, not an administrator lock, automatic overflow drops or guaranteed cross-save recovery.
+
+## Craft preparation and conservative cleanup
+
+`CharacterStorage.prepareCraft` accepts an immutable batch of distinct fresh character records and returns a process-local `CraftPreparation` handle. Allocation/configured starting points remain the caller's responsibility. Retain this handle until delivery or abandonment: `ready()` returns an observation copy, and cancelling/timing out that future does **not** cancel the owned operation. Use `abandon()` to invalidate the attempt, including while writes are queued/in progress. Writes acknowledge the complete prepared batch; `claimForDelivery()` exposes it once, immediately before native delivery. Claiming permanently rules out cleanup, even if later delivery throws.
+
+Abandonment skips remaining queued writes and schedules cleanup for acknowledged, never-issued creations. Cleanup checks the original file identity/creation and modification attributes and exact bytes under the repository lock. Changed, replaced, corrupt, symlinked, busy or unidentifiable files are retained. Partial-save failure cleans only acknowledged creations and reports uncertain targets without deleting them. Shutdown rejection preserves records rather than inventing successful cleanup. Repeated cleanup cannot delete a later file. Restart never reconstructs cleanup authority from revision zero or scans records for automatic deletion/reissue.
+
+Thirteen craft-persistence tests cover these backend boundaries, including worker timing, partial/post-rename failures, ownership changes, restart, shutdown, claim/abandon races, and mutated/cancelled observer futures. This backend alone is **not native inventory delivery**: the assembled controller separately contains vanilla consumption, validates current view/lifecycle/content and commits actual items. Filesystem locks coordinate cooperating writers; concurrent external filesystem mutation must be excluded/coordinated. File flush/atomic rename does not establish directory power-loss durability or Minecraft/plugin-save atomicity. All create/update/cleanup mutations now share one fail-fast `characters/.records.lock` coordination file, so abandoning new characters does not accumulate one lock file per ID. Read-only atomic-file loads remain unlocked. The file stays present but its OS lock is held only for an operation, not an administrator-unlock flag. Never unlink it while writers may use it. Old per-ID lock files are left intact; no new ones are created.
+
+**Upgrade boundary:** stop all older per-ID-protocol writers before opening the same data directory with this shared-lock implementation. Mixing versions or hot-reloading while old worker writes remain queued is unsafe. YAML format and record filenames are unchanged; no deployment or existing-server data migration has been performed. Contention between cooperating repository instances fails without mutation and can be retried, rather than blocking a server tick or deleting coordination files.
 
 ## Paper sheet and recipe definition
 
-`CharacterSheets` renders one Paper sheet from a saved live record, with its current name and the exact offhand instruction. `fantasystick:sheet_version` (integer 1) and `character_id` (UUID string) identify the character, with no owner lock or duplicated progress snapshot. Identification is only a reference: it does not authorize entry or replace saved-state/session validation. Rendering from a dead record is refused.
+`CharacterSheets` renders one Paper sheet from a saved live record, with its current name and three separate lore lines: `Character sheet:`, `Place in off hand`, `to enter fantasy world.` Recipe previews and acknowledged crafted sheets use the same layout; existing items are not bulk-rewritten. `fantasystick:sheet_version` (integer 1) and `character_id` (UUID string) identify the character, with no owner lock or duplicated progress snapshot. Identification is only a reference: it does not authorize entry or replace saved-state/session validation. Rendering from a dead record is refused.
 
-The `fantasystick:character_sheet` shapeless recipe definition contains one stick, paper, feather and ink sac. Its preview has no character metadata and allocates no identity/name. It is deliberately **not registered** yet: actual completion, bulk crafting, cancellation/save handling and anvil rename persistence still need their event adapters. Presentation edits preserving metadata are tested, not a claim that complete anvil transactions work.
+`CharacterFactory` allocates a fresh UUID and randomized two-part character name when explicitly called. It reuses the progression initializer for zero stats, level 1/zero XP, configured unspent points and full base health, with empty abilities/loadout/cooldowns and no prior death. Name collisions are allowed; identity is independent. Construction and recipe previews do not invoke allocation. Unit tests check fresh defaults/configured arbitrary-precision points, request-time allocation, seeded name variation and same-name/different-ID characters. A native composition test prepares a planned batch through YAML and verifies individually named sheets/IDs after native serialization without consuming or delivering inventory items. The assembled craft-event controller now invokes this allocator only for accepted current attempts.
+
+The `fantasystick:character_sheet` shapeless recipe definition contains one stick, paper, feather and ink sac. Character creation is **manual player crafting only** (inventory grid or crafting table). `ManualCraftingGuard` cancels this recipe's automated `CrafterCraftEvent` before native consumption/ejection, without touching other recipes or reversing cancellations. Startup installs this guard and the manual controller before exposing the recipe. Its preview has no character metadata and allocates no identity/name. Manual completion, bulk crafting, cancellation/save handling and accepted anvil-name persistence are registered. Presentation edits preserving metadata are tested, not a claim that complete anvil transactions work.
+
+## Manual craft planning (not delivery)
+
+`ManualCraftPlan` reads real crafting inventories without mutation. It calculates one result for cursor/number/offhand clicks, distinct empty destination slots for shift-click, and single/bulk intent for Q/Ctrl-Q. It bounds quantity by ingredients and storage capacity, preserves native reverse storage order, rejects cancelled/non-craft/wrong-recipe/malformed input, and snapshots full item data rather than retaining mutable native stack mirrors. Returned leftovers are detached copies; `matches` detects changed inputs, result, recipe, cursor or planned destinations without overwriting intervening items.
+
+This is **not a transaction commit**. Eleven native planner/composition tests use actual 2×2/3×3 crafting containers, player storage, menu-carried stacks and recipe holders, with the absent player/network boundary stubbed. They do not execute packet dispatch or vanilla result consumption. The assembled controller separately supplies one-use lifecycle tokens (a native menu may be reused after close/reopen), allocation/persistence wiring, reentrant update handling and delivery. Drop intent is not proof that a cancellable native drop succeeds. No recipe/listener registration, recovery policy or cross-save atomicity is added by this planner.
+
+## Fixed-destination craft delivery
+
+`ManualCraftDelivery` can apply a validated plan and exact-sized saved batch to the cursor, selected hotbar/offhand slot or bulk storage destinations. It rechecks current contents before claiming delivery, constructs all sheets first, then debits fresh native input mirrors and places all outputs before triggering one matrix recomputation. This deliberately relies on the pinned Purpur 2618 mirror/count/setter behavior. No further adapter-planned writes occur after the prepare-callback boundary. Existing native setters may send packets; this is not packet-silent or exception/crash-atomic.
+
+Nine native delivery tests cover normal/right-click, bulk and exact-slot delivery, partial ingredient metadata, empty first matrix cells, stale context refusal, mismatched/abandoned/reused batches, reentrancy, callback item changes, new-menu cursor safety and post-callback exceptions. The fixture uses actual containers/cursor stacks and intercepts `slotsChanged`; it does not execute a listening server's recipe manager or event dispatch. A mismatch refuses before consuming cleanup authority; an exception after claiming delivery conservatively retains records rather than replaying or rolling back.
+
+The caller still must contain vanilla consumption, validate a one-use lifecycle/attempt token, schedule on the server thread, pass the player's actual current view and synchronize the appropriate client menu afterward. World-drop plans return `UNSUPPORTED_ROUTE` unchanged in this component; that is not a registered gameplay policy. The registered controller uses this component only for fixed destinations and routes Q/Ctrl-Q separately.
+
+## Q/Ctrl-Q craft delivery
+
+Q/Ctrl-Q remain supported scope; no shortcut restriction was accepted or enabled. `ManualDropDelivery` executes saved drop plans one unit at a time, checking original contents minus completed debits before every next unit. `PlayerSheetDrops` creates an unspawned item, dispatches `PlayerDropItemEvent`, revalidates, and uses native `Item.spawnAt` for the cancellable `ItemSpawnEvent` path. It never uses inventory-source dropping or cancellation's return-to-inventory fallback. A successful unit consumes one ingredient set, then recomputes; cancellation stops the suffix without charging it.
+
+Thirteen additional tests cover sequential/bulk/cancelled drops, exact remaining-input validation, stale context, changed/removed entities, same-batch reentry and exceptions. Tests combine real native matrices, serialized sheets, YAML and Paper's event dispatcher; world insertion itself remains an explicit API boundary double, supplemented by pinned-runtime bytecode inspection. No live world or packet dispatch is claimed.
+
+After public callbacks, records are conservatively retained—including unused batch records. Repeated late cancellations can therefore accumulate records. A spawn callback can change inventory after an output escapes but before a safe debit; `UNCONFIRMED` means stop/report without speculative charging, deletion, rollback or replay. This is not arbitrary-plugin/cross-save atomicity. The controller must hold a per-attempt guard across callbacks (including against newly started attempts), revalidate actual current view/lifecycle, and synchronize the client. The registered controller supplies these guards and has native lifecycle coverage as described below.
+
+## Manual craft controller
+
+`ManualCraftingController` contains vanilla handling before deferred work, allocates/saves accepted plans, returns delivery to an always-deferred server-thread callback and synchronizes the player's actual current inventory afterward. It uses attempt-object identity plus a delivery reservation that survives close/reopen and remains held through client-sync callbacks. It invalidates on close, accepted open, quit and disable; stale callbacks cannot clear a newer attempt, and rejected scheduling abandons owned unissued records without worker-side player access.
+
+Twelve native controller tests cover saved deferred delivery, Q/Ctrl-Q routing with full storage, replay/reentrancy, menu reuse, client-sync reentry, pre-existing cancellation/unrelated recipes, rejected intents, allocation/save/scheduler failures, postclaim exceptions and retained-file reporting. Review reproduced a planning exception escaping before vanilla cancellation; capture now always cancels in `finally`. Async diagnostics are collected and asserted on the test thread rather than lost inside discarded futures. These tests invoke controller callbacks with real native grids/items/YAML and explicit player/scheduler/world boundaries, not a listening server. The controller checkpoint passed all 153 tests, audit and static analysis. The newer registration assembly is described below.
+
+Scheduler injection must always enqueue (never run inline) or throw on rejection. Diagnostic callbacks must be nonthrowing, thread-safe and avoid native player access. The existing cancellation boolean cannot distinguish this handler's containment from a later plugin's independent veto; prior cancellations are preserved. No new Q/Ctrl-Q restriction, global inventory lock or automatic uncertain-delivery replay is introduced.
+
+## Startup, configuration and shutdown
+
+The packaged `FantasyStickPlugin` now wires storage, allocation, deferred scheduling, native drop-event dispatch and logger diagnostics. Both protective listeners are installed before `fantasystick:character_sheet` is exposed. Recipe-key collisions and partial registration failures clean up this enable attempt without replacing an existing recipe. Shutdown invalidates attempts before closing storage, unregisters its listeners and removes its recipe; removal exceptions are reported while remaining cleanup continues.
+
+An optional `<plugin data>/config.yml` setting controls **new** characters' initial points:
+
+```yaml
+starting-points: 40
+```
+
+The default is 40; nonnegative arbitrary-precision integers are supported. Invalid values fail before gameplay registration. Existing saved characters are not rewritten. Configuration is read on enable; no reload command or automatic data migration is supplied.
+
+Nine native lifecycle tests load the actual packaged entrypoint through a test configured classloader and native `JavaPlugin.setEnabled`, then register/dispatch through Paper. They cover registration ordering, configured points, all craft routes, distinct persisted sheets, installed Crafter cancellation, failed startup and shutdown/queued-callback cleanup. Server registry/scheduler/player/world insertion are explicit test ports; this is not a listening world/client test. The assembled checkpoint passes clean/incremental packaging, all 162 tests, audit and static analysis; remote publication is tracked separately. This historical crafting checkpoint predates the equipment-session integration below; the remaining RPG is not complete.
+
+## Accepted anvil names
+
+`CharacterAnvilNames` observes Purpur's non-cancellable accepted-take event, not anvil previews. Matching input/result character identities and changed displayed text are captured on the server thread; `CharacterStorage.renameCharacter` then changes only name/revision on the persistence worker against the latest live record. It preserves stats, XP, levels, points, health, loadout, cooldowns and historical death identity. Same-name requests do not rewrite; missing/dead records cannot be created or revived by renamed items. Clearing the custom name uses the native item-factory name, including an explicit item-name component where present.
+
+Vanilla retains responsibility for item movement, XP charging and anvil damage. The inspected event fires at the start of native accepted-take processing, before that continuation; the observer does not make native completion contingent on YAML acknowledgment. Failure/crash may leave item presentation ahead of the saved name. The original saved progress is retained and captured IDs are logged; there is no automatic item/XP rollback, reissue or guaranteed retry.
+
+Six backend tests, seven native observer tests and an added packaged-entrypoint registration test cover preservation, sequencing, failures, shutdown, preview/take separation, name fallbacks and later serialized sheet/Tail rendering. Native XP/damage execution and live clients are not exercised by these fixtures. Active overhead/chat/tab presentation now refreshes after acknowledged saves, including renaming a copied reference held by someone else; stale session/revision callbacks cannot rename a replacement holder. This slice passes 176 tests, clean/incremental packaging, three additional native-suite repeats, audit and static analysis. A controller test's leftover retry was explicitly drained before fixture reuse (12 focused stress runs pass); production shutdown remains nonblocking. Remote publication is tracked separately.
+
+## Native health ceiling (historical core checkpoint)
+
+`CharacterProgress` now limits base maximum health to `min(10 + CON, supplied native limit)` without limiting CON purchases. A purchase adds only the actual maximum-health gain to current health: fractional gain when crossing the ceiling, zero gain once capped. Injury and revision/idempotency protections remain intact. The two-argument initializer uses the pinned runtime's default 1,024 HP; runtime adapters must pass their actual ceiling explicitly.
+
+`NativeHealthLimit.read()` reads the current native ranged attribute through the pinned runtime's public Craft/native accessors, without setting attributes or changing configuration. It must run on the server thread after registry initialization. Incompatible accessors or nonpositive/nonfinite/unrepresentable native ranges fail explicitly instead of guessing. This is not a refusal based on CON. Tests cover core purchases and actual native attribute compatibility at 10.5, 1,024 and 2,048 HP; native tests restore their temporary in-process range changes in `finally`.
+
+At this historical checkpoint, no virtual health, global configuration change, stored-data migration or active-player health adapter was introduced. The persisted schema's raw `10 + CON` validation envelope remains unchanged for compatibility. The later native session integration is described below; a complete Revive spell remains unfinished. Current-health gain is calculated against the core instance's fixed supplied limit; callers must obtain/revalidate the applicable limit at their native operation boundary. This slice passes 186 tests, clean/incremental packaging, audit and static analysis. Remote publication is tracked separately.
+
+## Session claims
+
+`SessionClaims` supplies process-local exclusion for pending/active character sessions. A single shared registry atomically prevents simultaneous claims for either the same character identity or the same player's active mode. This does not limit how many sheets a player may own or permanently bind a character to a holder. Released characters can transfer; a stale token cannot release a replacement claim. Private claim objects carry distinct session UUIDs for future equipment/callback correlation. Dead/zero-health DTOs refuse unchanged; shutdown invalidates all claims and refuses new ones.
+
+Six unit tests cover exclusion, transfer/switch release, stale callbacks, invalid input, shutdown/restart boundaries, same-name identities, uncapped values and 24 rounds of 16 competing callbacks. The registry does no persistence or native work and does not impose a native-health cap. It must be shared across entry routes; separate processes do not coordinate. Callers still must load current authoritative state, validate sheet possession/context/deadlines, preflight native equipment/health, retain/release claims across their lifecycle and reconcile interrupted state. `isCurrent()` is a lifetime check, not saved-state or effect authorization. The equipment coordinator now uses one shared registry for its entry/exit routes. The historical foundation passed 182 tests, clean/incremental packaging, audit and static analysis; remote publication is tracked separately.
 
 ## Native equipment adapter
 
@@ -43,7 +122,81 @@ The `fantasystick:character_sheet` shapeless recipe definition contains one stic
 
 Version-1 box metadata uses `fantasystick:storage_version`, `storage_owner_id`, `storage_session_id` and `storage_slots`. Box positions 0–8 contain original hotbar slots 0–8; positions 9–12 contain boots, leggings, chest and head from player slots 36–39. These metadata fields are for identity/restoration, not the only copy of the items. Restoration searches main slots 9–35, so sorting relocation does not lose the box. Repeated requests, wrong identity, duplicate/malformed boxes, unexpected extra contents or occupied restoration slots do not overwrite/delete items. These are adapter error results, not a persistent administrator lock or completed recovery policy.
 
-The caller must remove authenticated fantasy controls before restoration. One new head stack uses the slot freed by removing the box, even with a full main inventory; there is no drop fallback. The adapter does not yet route sheet/cursor events, emit entry warnings, manage character/player snapshots or register a playable session. Native tests use real player-slot storage with only the absent network recipient stubbed; client packets and live gameplay remain unverified.
+The coordinator supplies authenticated control ownership to the adapter, which validates all destinations before replacing controls. One new head stack uses the slot freed by removing the box, even with a full main inventory; there is no drop fallback. The equipment coordinator/event bridge now routes sheet/cursor events, emits entry warnings and registers sessions. Native health/vitals integration is described below; active nutrition overrides remain unfinished. Standalone display projection is implemented below. Native tests use real player-slot storage with only the absent network recipient stubbed; client packets and live gameplay remain unverified.
+
+## Equipment sessions and safe box movement
+
+The historical US-002 completion checkpoint passed all acceptance criteria and **359 automated tests** (315 Java/native and 44 release-tool tests), clean/incremental packaging, dependency audit and static analysis. The new equipment path loads authoritative characters, claims player/character identity, and acknowledges `<plugin data>/sessions/<player UUID>.yml` before packing. Preparation failure leaves gear unchanged. Nine typed bound controls occupy the hotbar; book/ability actions were not yet implemented at that checkpoint. Current inspection and party actions are described below; basic/learned attacks remain unfinished.
+
+The genuine **Fantasy Storage Box** contains actual original items. Picking it up for a move leaves it in main storage and issues a harmless bound cursor move-control. Confirming a valid main-storage destination exchanges the real box and that destination's contents; closing the inventory cancels the move. Sorting, stale callbacks and lifecycle changes cannot confer movement authority on a copied control. Full storage needs no extra space or overflow drops. Ordinary sheet movements, including Q/Ctrl-Q, remain supported.
+
+Exit removes controls and restores original slots once, locating the genuine box by owner/session rather than original index. A new head uses the freed box slot. Native player phase markers and the persisted receipt must agree for recovery; ambiguous state is preserved/reported, never guessed into replacement gear. Shutdown is best-effort and nonblocking; accepted cleanup drains before its receipt worker closes. Equipment stays vanilla-readable without this plugin.
+
+Optional `character-swap-cooldown-seconds` defaults to `900`; zero bypasses the player-bound restriction. Existing absolute deadlines survive configuration changes; only a new actual exit starts a new deadline, and repeated cleanup does not extend it. The switch-delay setting is read on enable; there is no general reload command or deployed configuration change.
+
+Administration (permission `fantasystick.admin`, default operators):
+
+- `/fantasystick inspect <player-uuid>` — asynchronous receipt/native-session inspection.
+- `/fantasystick recover <player-uuid>` — validated online equipment/game-mode restoration only; no forced overwrite, progression grant or ambiguous replay.
+- `/fantasystick config adventure-mode [true|false]` — show or persist the policy for new sessions; no change to active sessions.
+
+Tests use actual native items, inventories, serialization, Paper event dispatch and menu-close behavior, with explicit scheduler/player/world ports. Drag continuation ordering includes a model based on pinned bytecode. The packaged lifecycle fixture isolates the entrypoint but delegates helpers parent-first. Live clients, production PluginClassLoader execution and arbitrary-plugin/crash atomicity are not claimed verified. No deployment or existing-data migration is authorized by story completion.
+
+## Standalone character presentation
+
+Saved character identity/progress transfers between holders; ordinary equipment, vitals, return location and switch deadline do not. Native reference/session tests cover live/dead/invalid/copied identities, concurrent exclusion, orderly switches and legitimate backend revival. The complete Revive spell remains unfinished.
+
+ProtocolLib-backed presentation shows the full literal saved name above the player, in chat and in the player list, without changing the server account name/UUID/profile, scoreboard membership, ordinary display/list fields or authoritative name-tag-distance attribute. A detached client-only TextDisplay replaces the native overhead label; display-name-only player-info packets and the chat renderer's sender-name argument cover the other surfaces. No signed message-body or recipient rewrite is introduced.
+
+Output resources belong to a player connection/session, not the sheet. Exit/defeat/lifecycle cleanup withdraws them independently of successful gear restoration, using current ordinary server state rather than replaying stale fantasy names. Renames refresh only after authoritative file acknowledgment; future sessions also reload saved names. Reconnect/restart discards client-only labels, not ordinary identity data.
+
+**Cross-plugin display compatibility is unsupported**, as explicitly requested. There is no Stealth/Leaf/Ignis bridge or nickname/concealment guarantee. Native/platform visibility and ordinary cancellations are covered; supplemental presentation-owned packets bypass ProtocolLib filters to avoid recursive projection. Names can therefore conflict with other plugins' presentation or packet-only concealment. This does not disable ordinary protection or inventory safeguards.
+
+Tests exercise actual native codecs, renderer inputs and ProtocolLib dispatch with explicit transport/server/player ports. They do not prove live-client appearance or client delivery acknowledgments. Unknown transport outcomes are reported without speculative spawn replay; cleanup remains best-effort. Label reconciliation is tick-driven; live-client/network-load observation remains a follow-up. Optional Adventure mode is described below; its verification does not complete the remaining fantasy health, nutrition or combat features.
+
+## Optional Adventure mode
+
+`adventure-mode: true` is the default. A new entry captures this policy; enabled entries save the holder's original game mode in the player/session receipt before changing it to Adventure. Disabled entries leave the mode untouched, as do holders already in Adventure. This state never transfers with the character.
+
+The admin command saves on a worker, preserving unrelated configuration values, before publishing its effective value. Invalid values and failed writes leave that value unchanged. Already active sessions keep their captured policy. Accepted writes drain without blocking shutdown; immediate re-enable defers startup asynchronously until those writes finish, then reads the saved policy.
+
+Exit, defeat and best-effort lifecycle/recovery cleanup restore only an owned Adventure change. Observed later admin changes relinquish ownership, including an observed change away and back. Native cancellation refuses entry without packing; a cancelled restoration retains its receipt for inspection/retry. Interrupted or mismatched player markers are not replay permission. Mode cleanup is independent of uncertain equipment cleanup.
+
+A same-process retry can acknowledge gear already verified restored for that exact player while retrying a vetoed mode restoration; a serialized `RESTORED` marker alone cannot establish this after restart. Missing game-mode proof leaves the mode and receipt retained even when independently verified gear can be restored and synchronized. Player-data and YAML saves are not one transaction; unobserved out-of-band state edits are not detectable history. No forced player save, blanket Survival reset or deployment is introduced.
+
+## Native fantasy health, exit and defeat
+
+Offhand entry applies actual native maximum health `min(10 + CON, native health limit)`, resumes saved remaining character health, and shows public blue particles. A fresh character's saved health starts full. CON has no gameplay cap; high values do not reject entry. Native damage/healing rules remain in effect, with the existing party/mixed-mode protection. The book reports current native health rather than waiting for an exit save.
+
+`NativeMaximumHealth` owns only the effective-value cache/dirty callback of that player's existing native maximum-health instance. Base values, modifiers and native potion expiry remain owned by their original sources; nothing is copied back from an old modifier snapshot. The native player health methods and client attribute snapshot are tested. This adapter uses **pinned Purpur 2618 internals**, including private fields; a detached startup probe exercises installation, recalculation and removal before gameplay is registered. Runtime upgrades require renewed native compatibility verification, not a guessed fallback or global attribute-limit changes. Matching native health scaling displays the real fantasy maximum, not a separate virtual health pool; a later unrelated display-scale change is preserved on exit.
+
+Ordinary health, food, saturation, exhaustion and health-display state belong to the holder/session, not the character sheet. The session receipt acknowledges this snapshot before native mutation; versioned player PDC records its application/restoration phase. Voluntary exit restores ordinary gear/vitals at the current location, with ordinary health capped by the current legitimate maximum. Character damage is saved on the worker, and the character claim/receipt cannot complete ahead of that acknowledgment. Quit and disable perform the same best-effort cleanup. Failed or uncertain saves retain the receipt and acknowledged character record instead of permitting a stale-health reentry. Missing/ambiguous native proof never authorizes a snapshot heal; process-owned maximum overrides are still retired independently of equipment/client-write failures.
+
+An intercepted fantasy defeat records authoritative death once, removes session state, restores ordinary health to its current maximum and attempts return to the entry location. Ordinary health is restored before health-scale setters can send or queue client health packets: cancelled defeat must not deliver zero health and strand an otherwise alive player on a death screen. Refused/failed return leaves the player at the current location with a warning, not an alternate destination or invulnerability. A public red burst marks the defeat location. After the death acknowledgment, guarded conversion replaces the unchanged sheet stack with one signed Tail book. New Tails group ordinary-sized name/level/XP/points/stats on a summary page, then give each learned ability its own section with saved ID, assigned ability slots and cooldown deadline. Unknown IDs, saved unlearned cooldowns, empty abilities and death time stay explicit; long content continues onto additional pages without truncation. No ability descriptions are invented and existing books are not rewritten. Static Unicode-safe Tail pagination survives native serialization without a plugin; signed books use a different codec from the 100-page writable-book format. Stale or ambiguous conversion never overwrites another item or automatically reissues a book.
+
+Interrupted recovery requires matching player/session receipt and native proof. It preserves current native modifier ownership and does not resurrect expired effects. Repeated/stale recovery cannot replay ordinary health or recreate an already released claim. This is **not crash-atomic** across player, inventory and plugin files; unresolved native setter phases and unacknowledged progress may require inspection. Legacy equipment-only receipts remain readable but do not grant health-restoration authority. Older binaries do not understand the new optional ordinary-vitals receipt field; do not downgrade across unresolved newer receipts.
+
+Active hunger/exhaustion suppression and food-regeneration discrimination remain US-026 work. Book stat purchases, XP delivery, basic/learned attacks and Revive remain separate unfinished stories. The preceding equipment/progression checkpoint sections are historical evidence, not the current health scope.
+
+## Character inspection and inventory safety
+
+The first-hotbar-slot book reads the active character's authoritative name, six stats, health, level, XP/MAX, points and learned identities. Inspection does not change character data or inventory. Plain-text pages wrap conservatively for the vanilla font without splitting Unicode code points. Large supported records use volumes of at most 80 inspection pages, leaving room for navigation and party controls while bounding each opened view's payload. This is a plugin presentation bound, not Minecraft's 100-page writable-book cap; signed books use a different codec. `[Next pages]` / `[Previous pages]` reread current data; unknown ability IDs and arbitrarily large saved numbers are not silently discarded.
+
+Deferred reads and single-use navigation validate the player, session, character and held control. Superseded requests, ended sessions, quit/disable and invalid client tokens cannot open a stale view. Read failures preserve data and allow reopening. Native tests cover overflow, multiple volumes, rename, transfer, reload and unchanged inventory/data; actual client rendering and custom resource-pack fonts are not claimed as tested.
+
+All nine hotbar controls remain bound, with seven selectable placeholders on a new character. Native containment tests cover export/consumption, hidden swaps, recipe autofill, armor/cosmetics, cursor custody and sorting relocation. The packaged inventory journey proves that these guards still permit the real book action and that removing the transferable offhand sheet restores ordinary equipment. Future attack/ability consumers must retain these same safeguards.
+
+## Character-book parties and combat protection
+
+Use the slot-1 book to create a party, invite online players, accept invitations, leave, kick members or disband. Parties hold up to six consenting players. Only the creator/leader may invite, kick or disband; a leader leaving disbands rather than transferring leadership. Invitations last 60 real seconds and reserve no capacity. Book actions are single-use and bound to the current player/session/view, with authority and capacity rechecked on execution. Membership belongs to the player, not a traded character sheet, and grants no XP by itself.
+
+A disconnected leader remains leader while another member is online. All-offline parties, invitations and book views are discarded on shutdown/restart. This does not persist or restore party rosters.
+
+Native damage protection blocks friendly fire between active fantasy party members and player-attributable mixed-mode damage in both directions. Ordinary-versus-ordinary and environmental/mob combat retain their native rules and prior cancellations. Projectiles, TNT, fangs, clouds, fireworks and pet attacks retain player attribution; delayed fantasy sources cannot borrow a new session after exit, transfer or reconnect. Valid native healing is unchanged; stale projectile impacts are rejected before execution. Full RPG attacks and support/XP abilities remain separate unfinished work.
+
+Attributable poison, wither and burning retain bounded source/recipient provenance in native entity/player PDC (`combat_origin_v1`, `combat_dot_*_v1`). Each damage tick checks current membership, source/recipient session identity and native effect state. Poison/wither hidden layers keep their own source rather than inheriting a covering effect's origin. Removal, expiry and unrelated replacement clear only the matching provenance; cleanup does not remove native effects or change health, equipment, character YAML or XP. A tick-driven cleanup checks only the three relevant player metadata keys and stops on disable. Native PDC serialization retains source proofs across reload; ended fantasy sessions remain invalid, while parties themselves never survive restart. These are native save guarantees, not cross-save atomicity or dedicated cross-plugin integration.
+
+Automated party tests exercise actual packaged listeners, native book custom-click payloads, native event dispatch, effect-merging semantics and PDC serialization. Player/network/world execution remains represented by explicit test ports; live multiplayer testing and deployment are separate.
 
 ## CI and publication
 
@@ -61,4 +214,4 @@ The release credential must be a repository-write credential authorized for `dmg
 
 Stories, design, open decisions and evidence are in the private [SoMC wiki project](https://git.garvis.dev/dmg/somc-okf/src/branch/main/projects/purpur-fantasy-stick/index.md). See [AGENTS.md](AGENTS.md) for the shared process. Source builds do not need wiki access.
 
-No inventory recovery guarantees, gameplay balance, multiplayer behavior, or production compatibility have been verified by this bootstrap. Production rollout and GitOps changes remain separately approved; the development cycle never pushes GitOps.
+The documented crafting/cleanup boundaries are automated-test evidence, not cross-save atomicity, complete RPG balance, live multiplayer or production-compatibility verification. Production rollout and GitOps changes remain separately approved; the development cycle never pushes GitOps.

build.gradle.kts

@@ -25,6 +25,8 @@ tasks.withType<JavaCompile>().configureEach {
 
 dependencies {
     compileOnly("org.purpurmc.purpur:purpur-api:26.2.build.2618-stable")
+    compileOnly("net.dmulloy2:ProtocolLib:5.4.0")
+    testImplementation("net.dmulloy2:ProtocolLib:5.4.0")
     testImplementation("org.purpurmc.purpur:purpur-api:26.2.build.2618-stable")
     testImplementation(platform("org.junit:junit-bom:5.13.4"))
     testImplementation("org.junit.jupiter:junit-jupiter")
@@ -71,6 +73,8 @@ val nativeTest = sourceSets.create("nativeTest")
 dependencies {
     add(nativeTest.implementationConfigurationName, platform("org.junit:junit-bom:5.13.4"))
     add(nativeTest.implementationConfigurationName, "org.junit.jupiter:junit-jupiter")
+    add(nativeTest.implementationConfigurationName, "net.dmulloy2:ProtocolLib:5.4.0")
+    add(nativeTest.implementationConfigurationName, "org.mockito:mockito-core:5.18.0")
     add(nativeTest.compileOnlyConfigurationName, "org.jetbrains:annotations:26.0.2")
     add(nativeTest.compileOnlyConfigurationName, "org.checkerframework:checker-qual:3.49.2")
     add(nativeTest.runtimeOnlyConfigurationName, "org.junit.platform:junit-platform-launcher")
@@ -78,6 +82,8 @@ dependencies {
 val nativeRuntimeJars = files(fileTree(nativeRuntime) {
     include("versions/**/*.jar", "libraries/**/*.jar")
 }).builtBy(prepareNativeRuntime)
+// Pinned output-only packet codec; native classes remain provided by the server, never bundled.
+sourceSets.main.get().compileClasspath += nativeRuntimeJars
 nativeTest.compileClasspath += sourceSets.main.get().output + nativeRuntimeJars
 nativeTest.runtimeClasspath += sourceSets.main.get().output + nativeRuntimeJars
 val nativeCompatibilityTest = tasks.register<Test>("nativeCompatibilityTest") {

src/main/java/games/dmg/fantasystick/FantasyStickPlugin.java

@@ -1,7 +1,365 @@
 package games.dmg.fantasystick;
 
+import com.comphenix.protocol.ProtocolLibrary;
+import games.dmg.fantasystick.presentation.CharacterPresentation;
+import games.dmg.fantasystick.presentation.CharacterChatNames;
+import games.dmg.fantasystick.presentation.ProtocolPresentation;
+import games.dmg.fantasystick.crafting.CharacterFactory;
+import games.dmg.fantasystick.crafting.CharacterAnvilNames;
+import games.dmg.fantasystick.crafting.ManualCraftingController;
+import games.dmg.fantasystick.crafting.ManualCraftingGuard;
+import games.dmg.fantasystick.crafting.PlayerSheetDrops;
+import games.dmg.fantasystick.items.CharacterSheets;
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import games.dmg.fantasystick.persistence.EquipmentSessionStore;
+import games.dmg.fantasystick.session.EquipmentAdminCommand;
+import games.dmg.fantasystick.session.EquipmentSessionEvents;
+import games.dmg.fantasystick.session.EquipmentSessions;
+import games.dmg.fantasystick.persistence.YamlCharacterRepository;
+import games.dmg.fantasystick.progression.ProgressionRules;
+import java.time.Clock;
+import java.util.logging.Level;
 import org.bukkit.plugin.java.JavaPlugin;
 
-/** Build foundation only; gameplay is not yet registered or ready for deployment. */
+/** Crafting, native fantasy sessions, books, parties, names and permanent-stat progression. */
 public final class FantasyStickPlugin extends JavaPlugin {
+    private CharacterStorage characters;
+    private ManualCraftingController crafting;
+    private ManualCraftingGuard guard;
+    private CharacterAnvilNames anvilNames;
+    private boolean recipeRegistered;
+    private EquipmentSessionStore receipts;
+    private EquipmentSessions sessions;
+    private EquipmentSessionEvents sessionEvents;
+    private games.dmg.fantasystick.book.CharacterBookController books;
+    private games.dmg.fantasystick.party.PartyRoster parties;
+    private games.dmg.fantasystick.party.PartyEvents partyEvents;
+    private games.dmg.fantasystick.party.PartyCombat partyCombat;
+    private EquipmentAdminCommand admin;
+    private volatile Object lifetime;
+    private CharacterPresentation presentation;
+    private ProtocolPresentation protocolPresentation;
+    private CharacterChatNames chatNames;
+    private games.dmg.fantasystick.persistence.AdventureSettings adventureSettings;
+    private games.dmg.fantasystick.session.AdventureModeLease gameModes;
+    private games.dmg.fantasystick.session.SessionVitals vitals;
+    private games.dmg.fantasystick.session.SessionVisuals sessionVisuals;
+    private games.dmg.fantasystick.combat.BasicAttack basicAttack;
+    private games.dmg.fantasystick.party.CombatExperience combatExperience;
+    private games.dmg.fantasystick.ability.AbilityRegistry abilityRegistry;
+    private games.dmg.fantasystick.ability.AbilityEngine abilityEngine;
+    private games.dmg.fantasystick.ability.Fireball fireball;
+    private games.dmg.fantasystick.ability.Revive revive;
+    private games.dmg.fantasystick.persistence.RevivalStore revivals;
+    private games.dmg.fantasystick.session.NutritionPolicy nutritionPolicy;
+    private java.util.concurrent.CompletionStage<Void> configurationDrain = java.util.concurrent.CompletableFuture.completedStage(null);
+
+    @Override public void onEnable() {
+        try {
+            Object generation = new Object();
+            lifetime = generation;
+            if (!configurationDrain.toCompletableFuture().isDone()) {
+                configurationDrain.whenComplete((ignored, failure) -> {
+                    if (lifetime != generation) return;
+                    try {
+                        getServer().getScheduler().runTask(this, () -> {
+                            if (lifetime == generation && isEnabled()) onEnable();
+                        });
+                    } catch (RuntimeException rejected) {
+                        getLogger().log(Level.WARNING, "Configuration startup continuation unavailable", rejected);
+                    }
+                });
+                return;
+            }
+            reloadConfig();
+            var adventure = games.dmg.fantasystick.persistence.AdventureSettings.validate(getConfig().get("adventure-mode"));
+            adventureSettings = new games.dmg.fantasystick.persistence.AdventureSettings(getDataFolder().toPath(), adventure);
+            var switchDelay = switchDelay();
+            var rules = progressionRules();
+            var rewardRules = combatRewardRules();
+            var fireballSettings = fireballSettings();
+            var factory = new CharacterFactory();
+            characters = new CharacterStorage(new YamlCharacterRepository(getDataFolder().toPath()), Clock.systemUTC());
+            crafting = new ManualCraftingController(characters, () -> factory.create(rules),
+                task -> getServer().getScheduler().runTask(this, task),
+                player -> new PlayerSheetDrops(player, event -> getServer().getPluginManager().callEvent(event)),
+                problem -> getLogger().log(Level.WARNING, "Character craft " + problem.operation() + " for player "
+                    + problem.player() + "; character records " + problem.characters(), problem.cause()));
+            java.util.function.Consumer<Runnable> nextTick = task -> getServer().getScheduler().runTask(this, task);
+            java.util.function.Consumer<Throwable> presentationFailures = problem ->
+                getLogger().log(Level.WARNING, "Character presentation failed", problem);
+            // This supplier belongs to one enable, never the mutable plugin field after re-enable.
+            var localPresentation = new java.util.concurrent.atomic.AtomicReference<CharacterPresentation>();
+            var installationFailure = new java.util.concurrent.atomic.AtomicReference<Throwable>();
+            protocolPresentation = new ProtocolPresentation(this, ProtocolLibrary.getProtocolManager(),
+                () -> localPresentation.get().snapshot(), problem -> {
+                    installationFailure.compareAndSet(null, problem);
+                    presentationFailures.accept(problem);
+                });
+            presentation = new CharacterPresentation(protocolPresentation, nextTick,
+                () -> getServer().isPrimaryThread(), presentationFailures, characters::find);
+            localPresentation.set(presentation);
+            chatNames = new CharacterChatNames(presentation::name);
+            protocolPresentation.install();
+            if (installationFailure.get() != null) {
+                throw new IllegalStateException("Could not install character presentation", installationFailure.get());
+            }
+            guard = new ManualCraftingGuard();
+            anvilNames = new CharacterAnvilNames(characters,
+                problem -> getLogger().log(Level.WARNING, "Character name update was refused or failed for player "
+                    + problem.player() + "; character " + problem.character(), problem.cause()), getServer().getItemFactory(),
+                presentation::acknowledged);
+            receipts = new EquipmentSessionStore(getDataFolder().toPath(), Clock.systemUTC());
+            java.util.function.Consumer<EquipmentSessions.Failure> diagnostics = problem ->
+                getLogger().log(Level.WARNING, "Equipment transition/recovery for player " + problem.player()
+                    + "; session " + problem.session(), problem.cause());
+            gameModes = new games.dmg.fantasystick.session.AdventureModeLease();
+            sessions = new EquipmentSessions(characters, receipts, switchDelay, Clock.systemUTC(), nextTick,
+                notice -> notifyPlayer(generation, notice), diagnostics, presentation, adventureSettings::enabled, gameModes);
+            abilityRegistry = new games.dmg.fantasystick.ability.AbilityRegistry();
+            fireball = new games.dmg.fantasystick.ability.Fireball(fireballSettings);
+            revivals = new games.dmg.fantasystick.persistence.RevivalStore(getDataFolder().toPath());
+            revive = new games.dmg.fantasystick.ability.Revive(characters, revivals, Clock.systemUTC(), nextTick,
+                (size, title) -> getServer().createInventory(null, size, title),
+                problem -> getLogger().log(Level.WARNING, "Revive transition failed", problem));
+            abilityRegistry.register(fireball.definition());
+            abilityRegistry.register(revive.definition());
+            sessions.attachAbilityRegistry(abilityRegistry);
+            vitals = new games.dmg.fantasystick.session.SessionVitals();
+            sessions.attachVitals(vitals);
+            nutritionPolicy = new games.dmg.fantasystick.session.NutritionPolicy(sessions);
+            parties = new games.dmg.fantasystick.party.PartyRoster(Clock.systemUTC(), id -> {
+                var player = getServer().getPlayer(id);
+                return player != null && player.isOnline();
+            });
+            partyEvents = new games.dmg.fantasystick.party.PartyEvents(parties);
+            partyCombat = new games.dmg.fantasystick.party.PartyCombat(parties, sessions);
+            combatExperience = new games.dmg.fantasystick.party.CombatExperience(characters, rules, rewardRules,
+                sessions, Clock.systemUTC(), nextTick, id -> getServer().getPlayer(id),
+                problem -> getLogger().log(Level.WARNING, "Combat reward failed for character " + problem.character(), problem.cause()));
+            games.dmg.fantasystick.ability.AbilityScheduler abilityScheduler = (delay, action) -> {
+                long ticks = Math.max(1, (delay.toNanos() + 49_999_999L) / 50_000_000L);
+                var task = getServer().getScheduler().runTaskLater(this, action, ticks);
+                return task::cancel;
+            };
+            abilityEngine = new games.dmg.fantasystick.ability.AbilityEngine(abilityRegistry, characters, sessions, parties,
+                Clock.systemUTC(), nextTick, abilityScheduler, report -> { },
+                problem -> getLogger().log(Level.WARNING, "Ability engine failed for character " + problem.character()
+                    + "; ability " + problem.ability(), problem.cause()));
+            abilityEngine.install(this);
+            books = new games.dmg.fantasystick.book.CharacterBookController(characters, rules, sessions, nextTick,
+                problem -> getLogger().log(Level.WARNING, "Character book failed for player " + problem.player()
+                    + "; character " + problem.character(), problem.cause()), parties, getServer(), id -> {
+                    String name = localPresentation.get().name(id);
+                    var player = getServer().getPlayer(id);
+                    return net.kyori.adventure.text.Component.text(name != null ? name : player == null ? id.toString() : player.getName());
+                }, abilityRegistry, abilityEngine);
+            var localBasicAttack = new games.dmg.fantasystick.combat.BasicAttack(sessions);
+            basicAttack = localBasicAttack;
+            sessionEvents = new EquipmentSessionEvents(sessions, nextTick, diagnostics, input -> {
+                books.accept(input);
+                localBasicAttack.accept(input);
+                abilityEngine.accept(input);
+            });
+            sessionEvents.attachAbilityRegistry(abilityRegistry);
+            admin = new EquipmentAdminCommand(receipts, sessions, getServer(), nextTick,
+                problem -> getLogger().log(Level.WARNING, "Equipment admin " + problem.operation()
+                    + " for player " + problem.player(), problem.cause()), adventureSettings);
+            var command = java.util.Objects.requireNonNull(getCommand("fantasystick"), "Missing packaged fantasystick command");
+            command.setExecutor(admin);
+            command.setTabCompleter(admin);
+            getServer().getPluginManager().registerEvents(crafting, this);
+            getServer().getPluginManager().registerEvents(guard, this);
+            getServer().getPluginManager().registerEvents(anvilNames, this);
+            getServer().getPluginManager().registerEvents(sessionEvents, this);
+            getServer().getPluginManager().registerEvents(chatNames, this);
+            getServer().getPluginManager().registerEvents(partyEvents, this);
+            getServer().getPluginManager().registerEvents(partyCombat, this);
+            partyCombat.install(this);
+            getServer().getPluginManager().registerEvents(combatExperience, this);
+            combatExperience.install(this);
+            getServer().getPluginManager().registerEvents(fireball, this);
+            getServer().getPluginManager().registerEvents(revive, this);
+            getServer().getPluginManager().registerEvents(localBasicAttack, this);
+            getServer().getPluginManager().registerEvents(nutritionPolicy, this);
+            getServer().getPluginManager().registerEvents(books, this);
+            getServer().getPluginManager().registerEvents(gameModes, this);
+            sessionVisuals = new games.dmg.fantasystick.session.SessionVisuals(sessions,
+                failure -> getLogger().log(Level.WARNING, "Fantasy session particle delivery failed", failure));
+            sessionVisuals.install(this);
+            recipeRegistered = getServer().addRecipe(new CharacterSheets().recipe());
+            if (!recipeRegistered) throw new IllegalStateException("Character-sheet recipe key is already registered");
+            for (var player : getServer().getOnlinePlayers()) { sessions.arrive(player); revive.reconcile(player); }
+        } catch (RuntimeException | LinkageError failure) {
+            try { onDisable(); }
+            catch (RuntimeException | LinkageError cleanupFailure) { failure.addSuppressed(cleanupFailure); }
+            throw failure;
+        }
+    }
+
+    @Override public void onDisable() {
+        lifetime = null;
+        // Detach this enable's resources before any native callback can reenter disable.
+        var closingPresentation = presentation; presentation = null;
+        var closingProtocol = protocolPresentation; protocolPresentation = null;
+        var closingChat = chatNames; chatNames = null;
+        var closingAdmin = admin; admin = null;
+        var closingEvents = sessionEvents; sessionEvents = null;
+        var closingBooks = books; books = null;
+        var closingPartyEvents = partyEvents; partyEvents = null;
+        var closingPartyCombat = partyCombat; partyCombat = null;
+        var closingParties = parties; parties = null;
+        var closingCrafting = crafting; crafting = null;
+        var closingGuard = guard; guard = null;
+        var closingAnvil = anvilNames; anvilNames = null;
+        var closingSessions = sessions; sessions = null;
+        var closingReceipts = receipts; receipts = null;
+        var closingCharacters = characters; characters = null;
+        var closingSettings = adventureSettings; adventureSettings = null;
+        var closingModes = gameModes; gameModes = null;
+        var closingVitals = vitals; vitals = null;
+        var closingVisuals = sessionVisuals; sessionVisuals = null;
+        var closingBasicAttack = basicAttack; basicAttack = null;
+        var closingCombatExperience = combatExperience; combatExperience = null;
+        var closingAbilityEngine = abilityEngine; abilityEngine = null;
+        var closingFireball = fireball; fireball = null;
+        var closingRevive = revive; revive = null;
+        var closingRevivals = revivals; revivals = null;
+        abilityRegistry = null;
+        var closingNutrition = nutritionPolicy; nutritionPolicy = null;
+        // Retire client resources independently of successful ordinary-equipment restoration.
+        if (closingPresentation != null) cleanup("presentation", closingPresentation::close);
+        if (closingProtocol != null) cleanup("protocol presentation", closingProtocol::close);
+        if (closingAdmin != null) cleanup("admin command", closingAdmin::close);
+        if (closingSettings != null) {
+            configurationDrain = closingSettings.drained();
+            cleanup("configuration", closingSettings::close);
+        }
+        if (closingBooks != null) cleanup("character book", closingBooks::close);
+        if (closingBasicAttack != null) cleanup("basic attack", closingBasicAttack::close);
+        if (closingCombatExperience != null) cleanup("combat experience", closingCombatExperience::close);
+        if (closingFireball != null) cleanup("Fireball", closingFireball::close);
+        if (closingRevive != null) cleanup("Revive", closingRevive::close);
+        if (closingAbilityEngine != null) cleanup("ability engine", closingAbilityEngine::close);
+        if (closingNutrition != null) cleanup("nutrition policy", closingNutrition::close);
+        if (closingVisuals != null) cleanup("session particles", closingVisuals::close);
+        if (closingParties != null) cleanup("parties", closingParties::close);
+        if (closingPartyCombat != null) cleanup("party combat", closingPartyCombat::close);
+        if (closingEvents != null) cleanup("session events", closingEvents::close);
+        if (closingCrafting != null) cleanup("craft attempts", closingCrafting::close);
+        if (closingSessions != null) cleanup("equipment sessions", closingSessions::close);
+        if (closingVitals != null) cleanup("native health hooks", closingVitals::close);
+        unregister(closingModes);
+        unregister(closingChat);
+        unregister(closingPartyEvents);
+        unregister(closingPartyCombat);
+        unregister(closingCombatExperience);
+        unregister(closingFireball);
+        unregister(closingRevive);
+        unregister(closingBasicAttack);
+        unregister(closingNutrition);
+        unregister(closingBooks);
+        unregister(closingEvents);
+        unregister(closingCrafting);
+        unregister(closingGuard);
+        unregister(closingAnvil);
+        if (recipeRegistered) cleanup("character-sheet recipe", () -> {
+            getServer().removeRecipe(CharacterSheets.RECIPE);
+            recipeRegistered = false; // Retain ownership for a later retry if removal failed.
+        });
+        if (closingCharacters != null) cleanup("character storage", closingCharacters::close);
+        if (closingRevivals != null) cleanup("revival storage", closingRevivals::close);
+        // Never await IO on the server thread or close receipts ahead of accepted preparations.
+        if (closingReceipts != null) cleanup("equipment receipt drain", () -> {
+            if (closingSessions == null) closingReceipts.close();
+            else closingSessions.drained().whenComplete((ignored, failure) -> closingReceipts.close());
+        });
+    }
+
+    private void unregister(org.bukkit.event.Listener listener) {
+        if (listener != null) cleanup("listener " + listener.getClass().getSimpleName(),
+            () -> org.bukkit.event.HandlerList.unregisterAll(listener));
+    }
+
+    private void cleanup(String resource, Runnable action) {
+        try { action.run(); }
+        catch (RuntimeException | LinkageError failure) {
+            try { getLogger().log(Level.WARNING, "Could not close " + resource + "; continuing shutdown cleanup", failure); }
+            catch (RuntimeException | LinkageError ignored) { /* Diagnostics must not prevent remaining cleanup. */ }
+        }
+    }
+
+    private ProgressionRules progressionRules() {
+        try {
+            var starting = new java.math.BigInteger(getConfig().getString("starting-points", "40"));
+            var threshold = new java.math.BigInteger(getConfig().getString("xp-per-level", "100"));
+            var maximum = new java.math.BigInteger(getConfig().getString("maximum-level", "30")).intValueExact();
+            return new ProgressionRules(starting, threshold, maximum);
+        } catch (ArithmeticException invalid) {
+            throw new IllegalArgumentException("maximum-level exceeds the supported integer range", invalid);
+        }
+    }
+
+    private games.dmg.fantasystick.progression.CombatRewardRules combatRewardRules() {
+        try {
+            var passive = new java.math.BigInteger(getConfig().getString("passive-xp", "1"));
+            var ordinary = new java.math.BigInteger(getConfig().getString("ordinary-xp", "10"));
+            var boss = new java.math.BigInteger(getConfig().getString("boss-xp", "100"));
+            var spacing = new java.math.BigDecimal(getConfig().getString("restricted-kill-spacing-blocks", "3"));
+            return new games.dmg.fantasystick.progression.CombatRewardRules(passive, ordinary, boss, spacing);
+        } catch (NumberFormatException invalid) {
+            throw new IllegalArgumentException("Combat reward settings must be decimal numbers", invalid);
+        }
+    }
+
+    private games.dmg.fantasystick.ability.Fireball.Settings fireballSettings() {
+        try {
+            var base = new java.math.BigInteger(getConfig().getString("fireball-base-damage", "6"));
+            var cooldown = java.time.Duration.ofSeconds(new java.math.BigInteger(
+                getConfig().getString("fireball-cooldown-seconds", "4")).longValueExact());
+            double range = new java.math.BigDecimal(getConfig().getString("fireball-range-blocks", "32")).doubleValue();
+            var lifetime = java.time.Duration.ofSeconds(new java.math.BigInteger(
+                getConfig().getString("fireball-lifetime-seconds", "5")).longValueExact());
+            return new games.dmg.fantasystick.ability.Fireball.Settings(base, cooldown, range, lifetime);
+        } catch (ArithmeticException | NumberFormatException invalid) {
+            throw new IllegalArgumentException("Fireball settings must use supported nonnegative numeric values", invalid);
+        }
+    }
+
+    private java.time.Duration switchDelay() {
+        Object configured = getConfig().get("character-swap-cooldown-seconds", 900);
+        String value = String.valueOf(configured);
+        if (!value.matches("[0-9]+")) {
+            throw new IllegalArgumentException("character-swap-cooldown-seconds must be a nonnegative integer");
+        }
+        try {
+            var delay = java.time.Duration.ofSeconds(new java.math.BigInteger(value).longValueExact());
+            var deadline = java.time.Instant.now().plus(delay);
+            if (deadline.atOffset(java.time.ZoneOffset.UTC).getYear() > 9999) {
+                throw new IllegalArgumentException("character-swap-cooldown-seconds exceeds the persisted UTC timestamp range");
+            }
+            return delay;
+        } catch (ArithmeticException | java.time.DateTimeException invalid) {
+            throw new IllegalArgumentException("character-swap-cooldown-seconds exceeds the supported duration range", invalid);
+        }
+    }
+
+    private void notifyPlayer(Object generation, EquipmentSessions.Notice notice) {
+        Runnable delivery = () -> {
+            if (lifetime != generation) return;
+            var player = getServer().getPlayer(notice.player());
+            if (player == null || !player.isOnline()) return;
+            String message = switch (notice.code()) {
+                case "NO_SPACE" -> "Equipment entry refused: free one slot in your main inventory for the Fantasy Storage Box.";
+                case "INELIGIBLE_EQUIPMENT" -> "Equipment entry refused: a hotbar or armor item cannot fit in a vanilla shulker box. Move it before retrying.";
+                default -> notice.message();
+            };
+            player.sendMessage(message);
+            if (notice.code().equals("DEFEAT")) games.dmg.fantasystick.session.SessionVisuals.burst(player, org.bukkit.Color.RED, 12);
+            else player.spawnParticle(org.bukkit.Particle.ANGRY_VILLAGER, player.getLocation().add(0, 1, 0), 8, 0.3, 0.4, 0.3, 0);
+        };
+        if (lifetime != generation) return;
+        if (getServer().isPrimaryThread()) delivery.run();
+        else getServer().getScheduler().runTask(this, delivery);
+    }
 }

src/main/java/games/dmg/fantasystick/ability/AbilityDefinition.java

@@ -0,0 +1,40 @@
+package games.dmg.fantasystick.ability;
+
+import games.dmg.fantasystick.progression.Stat;
+import games.dmg.fantasystick.session.ControlInput;
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.time.Duration;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.regex.Pattern;
+import org.bukkit.Material;
+
+/** Immutable internal ability metadata and focused effect boundary; not an external add-on API. */
+public record AbilityDefinition(String id, String name, Material icon, List<String> lore, String instructions,
+        Map<Stat, BigInteger> requirements, BigInteger pointCost, Activation activation,
+        ControlInput.Gesture gesture, Duration cooldown, Map<String, BigDecimal> parameters,
+        TargetPolicy targetPolicy, AbilityEffect effect) {
+    public enum Activation { IMMEDIATE, DELAYED, PROJECTILE, AREA, SELECTION }
+    public enum TargetPolicy { SELF, HOSTILE, PROJECTILE_HOSTILE, ALLY, PARTY, AREA, SELECTION, EXCEPTIONAL_NONCOMBAT,
+        EXCEPTIONAL_NONCOMBAT_SELECTION }
+    private static final Pattern ID = Pattern.compile("[a-z][a-z0-9_]{0,63}");
+    private static final Pattern PARAMETER = Pattern.compile("[a-z][a-z0-9_-]{0,63}");
+
+    public AbilityDefinition {
+        Objects.requireNonNull(id); Objects.requireNonNull(name); Objects.requireNonNull(icon);
+        Objects.requireNonNull(lore); Objects.requireNonNull(instructions); Objects.requireNonNull(requirements);
+        Objects.requireNonNull(pointCost); Objects.requireNonNull(activation); Objects.requireNonNull(gesture);
+        Objects.requireNonNull(cooldown); Objects.requireNonNull(parameters); Objects.requireNonNull(targetPolicy);
+        Objects.requireNonNull(effect);
+        lore = List.copyOf(lore); requirements = Map.copyOf(requirements); parameters = Map.copyOf(parameters);
+        if (!ID.matcher(id).matches() || name.isBlank() || icon.isAir() || lore.isEmpty()
+                || lore.stream().anyMatch(String::isBlank) || instructions.isBlank() || pointCost.signum() <= 0
+                || cooldown.isNegative() || cooldown.compareTo(Duration.ofDays(365)) > 0 || requirements.values().stream().anyMatch(value -> value.compareTo(BigInteger.TEN) < 0)
+                || parameters.entrySet().stream().anyMatch(entry -> !PARAMETER.matcher(entry.getKey()).matches()
+                    || entry.getValue().signum() < 0 || !Double.isFinite(entry.getValue().doubleValue()))) {
+            throw new IllegalArgumentException("Invalid ability definition");
+        }
+    }
+}

src/main/java/games/dmg/fantasystick/ability/AbilityEffect.java

@@ -0,0 +1,9 @@
+package games.dmg.fantasystick.ability;
+
+/** Focused native effect invoked only after shared persistence, cooldown and target authorization. */
+@FunctionalInterface
+public interface AbilityEffect {
+    /** Effect-specific initial eligibility checked before the shared cooldown commit. */
+    default boolean accepts(games.dmg.fantasystick.session.ControlInput input) { return true; }
+    void activate(AbilityExecution execution);
+}

src/main/java/games/dmg/fantasystick/ability/AbilityEngine.java

@@ -0,0 +1,353 @@
+package games.dmg.fantasystick.ability;
+
+import games.dmg.fantasystick.party.PartyRoster;
+import games.dmg.fantasystick.persistence.CharacterRecord;
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import games.dmg.fantasystick.session.ControlInput;
+import games.dmg.fantasystick.session.EquipmentSessions;
+import java.math.BigInteger;
+import java.time.Clock;
+import java.time.DateTimeException;
+import java.time.Duration;
+import java.time.Instant;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.CompletableFuture;
+import java.util.function.Consumer;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.entity.Player;
+
+/** Shared character mutation, cooldown, target, execution, report and cleanup boundary. */
+public final class AbilityEngine implements Consumer<ControlInput>, AutoCloseable {
+    public record Failure(UUID character, String ability, Throwable cause) { }
+    public record Mutation(CharacterStorage.AbilityMutationStatus status, CharacterRecord record) { }
+    private record Key(UUID character, String ability) { }
+
+    private final AbilityRegistry registry;
+    private final CharacterStorage characters;
+    private final EquipmentSessions sessions;
+    private final PartyRoster parties;
+    private final Clock clock;
+    private final Consumer<Runnable> nextTick;
+    private final AbilityScheduler scheduler;
+    private final Consumer<AbilityReport> reports;
+    private final Consumer<Failure> failures;
+    private final Map<Key, Object> pending = new HashMap<>();
+    private final Map<Key, Long> generations = new HashMap<>();
+    private final Map<Key, Set<Runtime>> active = new HashMap<>();
+    private org.bukkit.scheduler.BukkitTask sweepTask;
+    private boolean closed;
+
+    public AbilityEngine(AbilityRegistry registry, CharacterStorage characters, EquipmentSessions sessions,
+            PartyRoster parties, Clock clock, Consumer<Runnable> nextTick, AbilityScheduler scheduler,
+            Consumer<AbilityReport> reports, Consumer<Failure> failures) {
+        this.registry = Objects.requireNonNull(registry); this.characters = Objects.requireNonNull(characters);
+        this.sessions = Objects.requireNonNull(sessions); this.parties = Objects.requireNonNull(parties);
+        this.clock = Objects.requireNonNull(clock); this.nextTick = Objects.requireNonNull(nextTick);
+        this.scheduler = Objects.requireNonNull(scheduler); this.reports = Objects.requireNonNull(reports);
+        this.failures = Objects.requireNonNull(failures);
+    }
+
+    public void install(org.bukkit.plugin.Plugin plugin) {
+        if (closed || sweepTask != null) throw new IllegalStateException("Ability engine is already installed or closed");
+        sweepTask = plugin.getServer().getScheduler().runTaskTimer(plugin, this::sweep, 1, 1);
+    }
+
+    public CompletableFuture<Mutation> purchase(ControlInput input, String ability, BigInteger expectedRevision) {
+        Objects.requireNonNull(input); Objects.requireNonNull(expectedRevision);
+        var definition = registry.find(ability).orElse(null);
+        if (closed || definition == null || input.kind() != ControlInput.Kind.BOOK || !input.stillCurrent()) {
+            return CompletableFuture.completedFuture(new Mutation(CharacterStorage.AbilityMutationStatus.UNAVAILABLE, null));
+        }
+        return mutation(input, ability, expectedRevision,
+            () -> characters.unlockAbility(input.session().character(), expectedRevision, ability,
+                definition.requirements(), definition.pointCost()));
+    }
+
+    public CompletableFuture<Mutation> assign(ControlInput input, String ability, int slot, BigInteger expectedRevision) {
+        Objects.requireNonNull(input); Objects.requireNonNull(expectedRevision);
+        if (closed || registry.find(ability).isEmpty() || input.kind() != ControlInput.Kind.BOOK || !input.stillCurrent()) {
+            return CompletableFuture.completedFuture(new Mutation(CharacterStorage.AbilityMutationStatus.UNAVAILABLE, null));
+        }
+        return mutation(input, ability, expectedRevision,
+            () -> characters.assignAbility(input.session().character(), expectedRevision, ability, slot));
+    }
+
+    public CompletableFuture<Mutation> unlearn(ControlInput input, String ability, BigInteger expectedRevision) {
+        Objects.requireNonNull(input); Objects.requireNonNull(expectedRevision);
+        if (closed || registry.find(ability).isEmpty() || input.kind() != ControlInput.Kind.BOOK || !input.stillCurrent()) {
+            return CompletableFuture.completedFuture(new Mutation(CharacterStorage.AbilityMutationStatus.UNAVAILABLE, null));
+        }
+        return mutation(input, ability, expectedRevision,
+            () -> characters.unlearnAbility(input.session().character(), expectedRevision, ability))
+            .thenApply(mutation -> {
+                if (mutation.record() != null && !mutation.record().learned().contains(ability)) {
+                    remove(input.session().character(), ability);
+                }
+                return mutation;
+            });
+    }
+
+    private CompletableFuture<Mutation> mutation(ControlInput input, String ability, BigInteger expectedRevision,
+            java.util.function.Supplier<CompletableFuture<CharacterStorage.AbilityMutation>> operation) {
+        var result = new CompletableFuture<Mutation>();
+        CompletableFuture<CharacterStorage.AbilityMutation> work;
+        try { work = operation.get(); }
+        catch (RuntimeException failure) { report(input.session().character(), ability, failure); result.completeExceptionally(failure); return result; }
+        work.whenComplete((mutation, failure) -> schedule(input.session().character(), ability, result, () -> {
+            if (failure != null) { report(input.session().character(), ability, failure); result.completeExceptionally(failure); return; }
+            var record = mutation.record().orElse(null);
+            if (mutation.status() == CharacterStorage.AbilityMutationStatus.APPLIED) {
+                try {
+                    if (record == null || !input.stillCurrent()
+                            || !sessions.acknowledgeProgress(input.session(), expectedRevision, record)) {
+                        result.complete(new Mutation(CharacterStorage.AbilityMutationStatus.STALE, record)); return;
+                    }
+                } catch (RuntimeException nativeFailure) {
+                    report(input.session().character(), ability, nativeFailure);
+                    result.completeExceptionally(nativeFailure); return;
+                }
+            }
+            result.complete(new Mutation(mutation.status(), record));
+        }));
+        return result;
+    }
+
+    @Override public void accept(ControlInput input) {
+        if (closed || input.kind() != ControlInput.Kind.ABILITY || !input.stillCurrent()) return;
+        var definition = registry.find(input.ability()).orElse(null);
+        if (definition == null || definition.gesture() != input.gesture()) {
+            input.player().sendMessage("That ability is unavailable."); return;
+        }
+        var record = sessions.currentRecord(input.session()).orElse(null);
+        if (record == null || !record.learned().contains(definition.id())
+                || input.slot() < 2 || !record.loadout().get(input.slot() - 2).equals(definition.id())) {
+            input.player().sendMessage("That ability is not learned and assigned to this control."); return;
+        }
+        Instant now = clock.instant();
+        Instant existing = record.cooldowns().get(definition.id());
+        if (existing != null && now.isBefore(existing)) {
+            input.player().sendMessage("" + definition.name() + " is ready in "
+                + Math.max(1, Duration.between(now, existing).toSeconds()) + " seconds."); return;
+        }
+        boolean accepted;
+        try { accepted = eligible(definition.targetPolicy(), input, input.target()) && definition.effect().accepts(input); }
+        catch (RuntimeException invalid) {
+            report(input.session().character(), definition.id(), invalid);
+            input.player().sendMessage("That target could not be validated for " + definition.name() + "."); return;
+        }
+        if (!accepted) {
+            input.player().sendMessage("That target is not eligible for " + definition.name() + "."); return;
+        }
+        var key = new Key(input.session().character(), definition.id());
+        Object token = new Object();
+        if (pending.putIfAbsent(key, token) != null) { input.player().sendMessage("That cast is still being saved."); return; }
+        long generation = generations.getOrDefault(key, 0L);
+        Instant readyAt;
+        try { readyAt = now.plus(definition.cooldown()); }
+        catch (DateTimeException | ArithmeticException invalid) {
+            pending.remove(key, token); report(key.character(), key.ability(), invalid);
+            input.player().sendMessage("That ability's cooldown is invalid."); return;
+        }
+        characters.commitAbilityCooldown(key.character(), record.revision(), key.ability(), readyAt)
+            .whenComplete((mutation, failure) -> {
+                try {
+                    nextTick.accept(() -> completeCast(input, definition, record.revision(), readyAt,
+                        key, token, generation, mutation, failure));
+                } catch (RuntimeException rejected) {
+                    pending.remove(key, token); report(key.character(), key.ability(), rejected);
+                }
+            });
+    }
+
+    private void completeCast(ControlInput input, AbilityDefinition definition, BigInteger expectedRevision, Instant readyAt,
+            Key key, Object token, long generation, CharacterStorage.AbilityMutation mutation, Throwable failure) {
+        if (!pending.remove(key, token)) return;
+        if (closed) return;
+        if (failure != null) {
+            report(key.character(), key.ability(), failure);
+            input.player().sendMessage("The cast could not be saved; no effect was applied."); return;
+        }
+        boolean unchangedDeadline = mutation.status() == CharacterStorage.AbilityMutationStatus.UNCHANGED
+            && mutation.record().map(record -> readyAt.equals(record.cooldowns().get(key.ability()))).orElse(false);
+        if ((mutation.status() != CharacterStorage.AbilityMutationStatus.APPLIED && !unchangedDeadline)
+                || mutation.record().isEmpty()) {
+            input.player().sendMessage(switch (mutation.status()) {
+                case COOLDOWN -> "That ability is still on cooldown.";
+                case STALE -> "That character changed; retry the cast.";
+                case NOT_LEARNED, UNAVAILABLE -> "That ability is no longer available to this character.";
+                default -> "The cast was refused without applying an effect.";
+            });
+            return;
+        }
+        CharacterRecord saved = mutation.record().orElseThrow();
+        boolean synchronizedProgress = unchangedDeadline
+            ? sessions.currentRecord(input.session()).filter(saved::equals).isPresent()
+            : sessions.acknowledgeProgress(input.session(), expectedRevision, saved);
+        if (!synchronizedProgress) {
+            input.player().sendMessage("The cooldown was saved, but the session changed; no effect was applied."); return;
+        }
+        if (!input.stillCurrent() || generations.getOrDefault(key, 0L) != generation
+                || !eligible(definition.targetPolicy(), input, input.target())) {
+            input.player().sendMessage("The cooldown was saved, but eligibility changed; no effect was applied."); return;
+        }
+        var runtime = new Runtime(key, input, definition, generation);
+        active.computeIfAbsent(key, ignored -> new HashSet<>()).add(runtime);
+        try {
+            definition.effect().activate(runtime);
+            if (definition.activation() == AbilityDefinition.Activation.IMMEDIATE) runtime.finish();
+        } catch (RuntimeException effectFailure) {
+            runtime.close(); report(key.character(), key.ability(), effectFailure);
+            input.player().sendMessage("The cooldown was saved, but the ability effect failed safely.");
+        }
+    }
+
+    /** Future refund/removal paths invalidate pending callbacks and close only this ability's owned work. */
+    public void remove(UUID character, String ability) {
+        var key = new Key(Objects.requireNonNull(character), Objects.requireNonNull(ability));
+        generations.put(key, generations.getOrDefault(key, 0L) + 1);
+        pending.remove(key);
+        for (var runtime : List.copyOf(active.getOrDefault(key, Set.of()))) runtime.close();
+    }
+
+    /** Bounded lifecycle sweep; plugin timers may call this without scanning future catalogues. */
+    public void sweep() {
+        if (closed) return;
+        int checked = 0;
+        outer: for (var runtimes : List.copyOf(active.values())) {
+            for (var runtime : List.copyOf(runtimes)) {
+                if (!runtime.stillCurrent()) runtime.close();
+                if (++checked == 64) break outer;
+            }
+        }
+    }
+
+    private boolean eligible(AbilityDefinition.TargetPolicy policy, ControlInput input, Entity target) {
+        return switch (policy) {
+            case SELF -> target == null || target == input.player();
+            case HOSTILE -> hostile(input, target);
+            case PROJECTILE_HOSTILE -> target == null || hostile(input, target);
+            case ALLY -> target instanceof Player player && fantasy(player);
+            case PARTY -> target instanceof Player player
+                && (player == input.player() || fantasy(player) && sameParty(input.player(), player));
+            case AREA -> target == null || target instanceof LivingEntity && (!(target instanceof Player player) || fantasy(player));
+            case SELECTION -> target == null || target instanceof LivingEntity && (!(target instanceof Player player) || fantasy(player));
+            case EXCEPTIONAL_NONCOMBAT -> target instanceof Player && target != input.player();
+            case EXCEPTIONAL_NONCOMBAT_SELECTION -> target == null || target instanceof Player && target != input.player();
+        };
+    }
+
+    private boolean hostile(ControlInput input, Entity target) {
+        return target instanceof LivingEntity && target != input.player()
+            && (!(target instanceof Player player) || fantasy(player) && !sameParty(input.player(), player));
+    }
+
+    private boolean fantasy(Player player) { return sessions.active(player.getUniqueId()).filter(sessions::current).isPresent(); }
+    private boolean sameParty(Player source, Player target) {
+        return parties.partyOf(source.getUniqueId()).filter(party -> party.members().contains(target.getUniqueId())).isPresent();
+    }
+
+    private <T> void schedule(UUID character, String ability, CompletableFuture<T> result, Runnable action) {
+        try { nextTick.accept(action); }
+        catch (RuntimeException rejected) {
+            report(character, ability, rejected);
+            if (result != null) result.completeExceptionally(rejected);
+        }
+    }
+
+    private void report(UUID character, String ability, Throwable failure) {
+        try { failures.accept(new Failure(character, ability, failure)); }
+        catch (RuntimeException ignored) { /* Diagnostics never authorize or replay an effect. */ }
+    }
+
+    private final class Runtime implements AbilityExecution {
+        private final Key key;
+        private final ControlInput input;
+        private final AbilityDefinition definition;
+        private final long generation;
+        private final Set<AutoCloseable> owned = new HashSet<>();
+        private boolean finished;
+        private int scheduled;
+
+        Runtime(Key key, ControlInput input, AbilityDefinition definition, long generation) {
+            this.key = key; this.input = input; this.definition = definition; this.generation = generation;
+        }
+        @Override public AbilityDefinition definition() { return definition; }
+        @Override public ControlInput input() { return input; }
+        @Override public CharacterRecord character() {
+            return sessions.currentRecord(input.session()).orElseThrow(() -> new IllegalStateException("Ability session ended"));
+        }
+        @Override public boolean stillCurrent() {
+            return !closed && !finished && input.stillCurrent() && sessions.current(input.session())
+                && generations.getOrDefault(key, 0L) == generation
+                && sessions.currentRecord(input.session()).filter(record -> record.learned().contains(key.ability())).isPresent();
+        }
+        @Override public List<Entity> eligible(Collection<? extends Entity> candidates, int maximum) {
+            Objects.requireNonNull(candidates);
+            if (maximum < 1 || maximum > 64) throw new IllegalArgumentException("Recipient bound must be 1..64");
+            var result = new ArrayList<Entity>(); int inspected = 0;
+            for (var candidate : candidates) {
+                if (++inspected > 256 || result.size() == maximum) break;
+                if (stillCurrent() && AbilityEngine.this.eligible(definition.targetPolicy(), input, candidate)) result.add(candidate);
+            }
+            return List.copyOf(result);
+        }
+        @Override public AbilityScheduler.Task later(Duration delay, Runnable action) {
+            Objects.requireNonNull(delay); Objects.requireNonNull(action);
+            if (delay.isNegative() || delay.compareTo(Duration.ofDays(365)) > 0 || ++scheduled > 64) {
+                throw new IllegalArgumentException("Delayed effect is outside the bounded execution contract");
+            }
+            var task = scheduler.later(delay, () -> {
+                if (!stillCurrent() || !AbilityEngine.this.eligible(definition.targetPolicy(), input, input.target())) {
+                    close(); return;
+                }
+                try { action.run(); }
+                catch (RuntimeException failure) {
+                    close(); AbilityEngine.this.report(key.character(), key.ability(), failure);
+                }
+            });
+            own(task); return task;
+        }
+        @Override public void own(AutoCloseable resource) {
+            Objects.requireNonNull(resource);
+            if (finished || owned.size() >= 64) {
+                try { resource.close(); } catch (Exception ignored) { }
+                if (!finished) throw new IllegalStateException("Ability owns too many resources");
+                return;
+            }
+            owned.add(resource);
+        }
+        @Override public void report(AbilityReport.Type type, Entity target, java.math.BigDecimal amount) {
+            if (!stillCurrent() || definition.targetPolicy() == AbilityDefinition.TargetPolicy.EXCEPTIONAL_NONCOMBAT
+                    || definition.targetPolicy() == AbilityDefinition.TargetPolicy.EXCEPTIONAL_NONCOMBAT_SELECTION
+                    || target == null || !AbilityEngine.this.eligible(definition.targetPolicy(), input, target)) return;
+            reports.accept(new AbilityReport(type, key.character(), input.session().session(), target.getUniqueId(), amount, clock.instant()));
+        }
+        @Override public void finish() { close(); }
+        @Override public void close() {
+            if (finished) return;
+            finished = true;
+            var resources = List.copyOf(owned); owned.clear();
+            for (var resource : resources) try { resource.close(); } catch (Exception failure) { AbilityEngine.this.report(key.character(), key.ability(), failure); }
+            var runtimes = active.get(key);
+            if (runtimes != null) { runtimes.remove(this); if (runtimes.isEmpty()) active.remove(key); }
+        }
+    }
+
+    @Override public void close() {
+        if (closed) return;
+        closed = true;
+        if (sweepTask != null) sweepTask.cancel();
+        pending.clear();
+        for (var runtimes : List.copyOf(active.values())) for (var runtime : List.copyOf(runtimes)) runtime.close();
+        active.clear(); generations.clear();
+    }
+}

src/main/java/games/dmg/fantasystick/ability/AbilityExecution.java

@@ -0,0 +1,22 @@
+package games.dmg.fantasystick.ability;
+
+import games.dmg.fantasystick.session.ControlInput;
+import java.math.BigDecimal;
+import java.time.Duration;
+import java.util.Collection;
+import java.util.List;
+import org.bukkit.entity.Entity;
+
+/** Bounded owned runtime supplied by the shared engine after durable cast authorization. */
+public interface AbilityExecution extends AutoCloseable {
+    AbilityDefinition definition();
+    ControlInput input();
+    games.dmg.fantasystick.persistence.CharacterRecord character();
+    boolean stillCurrent();
+    List<Entity> eligible(Collection<? extends Entity> candidates, int maximum);
+    AbilityScheduler.Task later(Duration delay, Runnable action);
+    void own(AutoCloseable resource);
+    void report(AbilityReport.Type type, Entity target, BigDecimal amount);
+    void finish();
+    @Override void close();
+}

src/main/java/games/dmg/fantasystick/ability/AbilityRegistry.java

@@ -0,0 +1,27 @@
+package games.dmg.fantasystick.ability;
+
+import java.util.Comparator;
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.concurrent.ConcurrentHashMap;
+
+/** Process-local validated definitions; saved unknown IDs remain character data, not executable definitions. */
+public final class AbilityRegistry {
+    private final ConcurrentHashMap<String, AbilityDefinition> definitions = new ConcurrentHashMap<>();
+
+    public void register(AbilityDefinition definition) {
+        Objects.requireNonNull(definition);
+        if (definitions.putIfAbsent(definition.id(), definition) != null) {
+            throw new IllegalArgumentException("Duplicate ability ID: " + definition.id());
+        }
+    }
+
+    public Optional<AbilityDefinition> find(String id) {
+        return id == null ? Optional.empty() : Optional.ofNullable(definitions.get(id));
+    }
+
+    public List<AbilityDefinition> definitions() {
+        return definitions.values().stream().sorted(Comparator.comparing(AbilityDefinition::id)).toList();
+    }
+}

src/main/java/games/dmg/fantasystick/ability/AbilityReport.java

@@ -0,0 +1,19 @@
+package games.dmg.fantasystick.ability;
+
+import java.math.BigDecimal;
+import java.time.Instant;
+import java.util.Objects;
+import java.util.UUID;
+
+/** Evidence of an actual accepted effect; consumers decide rewards separately. */
+public record AbilityReport(Type type, UUID sourceCharacter, UUID sourceSession, UUID target,
+                            BigDecimal amount, Instant occurredAt) {
+    public enum Type { DAMAGE, HEALING, CLEANSING, PREVENTION, BOOST_USED }
+    public AbilityReport {
+        Objects.requireNonNull(type); Objects.requireNonNull(sourceCharacter); Objects.requireNonNull(sourceSession);
+        Objects.requireNonNull(target); Objects.requireNonNull(amount); Objects.requireNonNull(occurredAt);
+        if (amount.signum() <= 0 || !Double.isFinite(amount.doubleValue())) {
+            throw new IllegalArgumentException("An effective report requires a positive finite amount");
+        }
+    }
+}

src/main/java/games/dmg/fantasystick/ability/AbilityScheduler.java

@@ -0,0 +1,13 @@
+package games.dmg.fantasystick.ability;
+
+import java.time.Duration;
+
+/** Server-thread delayed-work boundary; returned tasks cancel only their owned callback. */
+@FunctionalInterface
+public interface AbilityScheduler {
+    Task later(Duration delay, Runnable action);
+
+    interface Task extends AutoCloseable {
+        @Override void close();
+    }
+}

src/main/java/games/dmg/fantasystick/ability/Fireball.java

@@ -0,0 +1,162 @@
+package games.dmg.fantasystick.ability;
+
+import games.dmg.fantasystick.progression.Stat;
+import games.dmg.fantasystick.session.ControlInput;
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.time.Duration;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.UUID;
+import org.bukkit.Location;
+import org.bukkit.Material;
+import org.bukkit.Particle;
+import org.bukkit.damage.DamageSource;
+import org.bukkit.damage.DamageType;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.entity.Snowball;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.entity.EntityDamageEvent;
+import org.bukkit.event.entity.ProjectileHitEvent;
+import org.bukkit.util.Vector;
+
+/** Fireball's owned snowball projectile, direct custom damage and bounded cleanup adapter. */
+public final class Fireball implements AbilityEffect, Listener, AutoCloseable {
+    private static final double SPEED_PER_TICK = 1.0;
+
+    public record Settings(BigInteger baseDamage, Duration cooldown, double range, Duration lifetime) {
+        public Settings {
+            Objects.requireNonNull(baseDamage); Objects.requireNonNull(cooldown); Objects.requireNonNull(lifetime);
+            if (baseDamage.signum() < 0 || cooldown.isNegative() || cooldown.compareTo(Duration.ofDays(365)) > 0
+                    || !Double.isFinite(range) || range <= 0 || range > 1024
+                    || lifetime.isZero() || lifetime.isNegative() || lifetime.compareTo(Duration.ofSeconds(60)) > 0) {
+                throw new IllegalArgumentException("Invalid Fireball settings");
+            }
+        }
+        public static Settings defaults() {
+            return new Settings(BigInteger.valueOf(6), Duration.ofSeconds(4), 32, Duration.ofSeconds(5));
+        }
+    }
+
+    private final Settings settings;
+    private final Map<UUID, State> projectiles = new HashMap<>();
+    private State damaging;
+    private boolean closed;
+
+    private final class State implements AutoCloseable {
+        final Snowball projectile;
+        final AbilityExecution execution;
+        final Location origin;
+        final BigInteger intelligence;
+        LivingEntity target;
+        boolean finished;
+        State(Snowball projectile, AbilityExecution execution, Location origin, BigInteger intelligence) {
+            this.projectile = projectile; this.execution = execution; this.origin = origin; this.intelligence = intelligence;
+        }
+        @Override public void close() {
+            if (finished) return;
+            finished = true;
+            projectiles.remove(projectile.getUniqueId(), this);
+            projectile.remove();
+        }
+    }
+
+    public Fireball(Settings settings) { this.settings = Objects.requireNonNull(settings); }
+
+    public AbilityDefinition definition() {
+        return new AbilityDefinition("fireball", "Fireball", Material.SNOWBALL,
+            List.of("Launch a bounded fiery snowball.", "Deals " + settings.baseDamage() + " + INT modifier damage."),
+            "Use the equipped snowball; a miss still spends the cooldown.",
+            Map.of(Stat.INT, BigInteger.valueOf(12)), BigInteger.ONE,
+            AbilityDefinition.Activation.PROJECTILE, ControlInput.Gesture.USE, settings.cooldown(),
+            Map.of("base-damage", new BigDecimal(settings.baseDamage()),
+                "range", BigDecimal.valueOf(settings.range()).stripTrailingZeros(),
+                "lifetime", BigDecimal.valueOf(settings.lifetime().toMillis(), 3).stripTrailingZeros()),
+            AbilityDefinition.TargetPolicy.PROJECTILE_HOSTILE, this);
+    }
+
+    public static BigInteger damage(BigInteger intelligence) {
+        return damage(BigInteger.valueOf(6), intelligence);
+    }
+
+    static BigInteger damage(BigInteger base, BigInteger intelligence) {
+        Objects.requireNonNull(base); Objects.requireNonNull(intelligence);
+        if (base.signum() < 0 || intelligence.signum() < 0) throw new IllegalArgumentException("Invalid Fireball damage input");
+        BigInteger delta = intelligence.subtract(BigInteger.TEN);
+        BigInteger[] divided = delta.divideAndRemainder(BigInteger.TWO);
+        BigInteger modifier = divided[0];
+        if (delta.signum() < 0 && divided[1].signum() != 0) modifier = modifier.subtract(BigInteger.ONE);
+        return base.add(modifier);
+    }
+
+    @Override public void activate(AbilityExecution execution) {
+        if (closed || !execution.stillCurrent()) return;
+        var player = execution.input().player();
+        Location origin = player.getEyeLocation().clone();
+        Vector direction = origin.getDirection();
+        if (!Double.isFinite(direction.getX()) || !Double.isFinite(direction.getY()) || !Double.isFinite(direction.getZ())
+                || direction.lengthSquared() == 0) throw new IllegalStateException("Fireball direction is unavailable");
+        var projectile = player.launchProjectile(Snowball.class, direction.normalize().multiply(SPEED_PER_TICK));
+        projectile.setVisualFire(true);
+        var state = new State(projectile, execution, origin, execution.character().stats().get(Stat.INT));
+        if (projectiles.putIfAbsent(projectile.getUniqueId(), state) != null) {
+            projectile.remove(); throw new IllegalStateException("Duplicate Fireball projectile identity");
+        }
+        execution.own(state);
+        long rangeTicks = Math.max(1, (long) Math.ceil(settings.range() / SPEED_PER_TICK));
+        execution.later(Duration.ofMillis(Math.multiplyExact(rangeTicks, 50)), execution::finish);
+        execution.later(settings.lifetime(), execution::finish);
+        player.getWorld().spawnParticle(Particle.FLAME, origin, 8, 0.15, 0.15, 0.15, 0.01);
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void hit(ProjectileHitEvent event) {
+        var state = projectiles.remove(event.getEntity().getUniqueId());
+        if (state == null) return;
+        try {
+            if (closed || event.isCancelled() || !state.execution.stillCurrent()
+                    || !(event.getHitEntity() instanceof LivingEntity target) || !inRange(state, event.getEntity().getLocation())
+                    || state.execution.eligible(List.of(target), 1).isEmpty()) return;
+            BigInteger amount = damage(settings.baseDamage(), state.intelligence);
+            double nativeDamage = amount.bitLength() > 1023 ? Double.MAX_VALUE : amount.doubleValue();
+            var source = DamageSource.builder(DamageType.FIREBALL).withCausingEntity(state.execution.input().player())
+                .withDirectEntity(state.projectile).withDamageLocation(state.projectile.getLocation()).build();
+            state.target = target;
+            damaging = state;
+            try { target.damage(nativeDamage, source); }
+            finally { if (damaging == state) damaging = null; }
+        } finally {
+            state.execution.finish();
+        }
+    }
+
+    private boolean inRange(State state, Location current) {
+        return current.getWorld() != null && state.origin.getWorld() != null
+            && current.getWorld().equals(state.origin.getWorld())
+            && current.distanceSquared(state.origin) <= settings.range() * settings.range();
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void acceptedDamage(EntityDamageEvent event) {
+        var state = damaging;
+        if (state == null || event.getEntity() != state.target || event.getFinalDamage() <= 0
+                || !Double.isFinite(event.getFinalDamage())) return;
+        var direct = event.getDamageSource().getDirectEntity();
+        if (direct != state.projectile && (!(event instanceof org.bukkit.event.entity.EntityDamageByEntityEvent byEntity)
+                || byEntity.getDamager() != state.projectile)) return;
+        var causing = event.getDamageSource().getCausingEntity();
+        if (causing != null && causing != state.execution.input().player()) return;
+        state.execution.report(AbilityReport.Type.DAMAGE, event.getEntity(), BigDecimal.valueOf(event.getFinalDamage()));
+    }
+
+    @Override public void close() {
+        if (closed) return;
+        closed = true;
+        for (var state : List.copyOf(projectiles.values())) state.execution.finish();
+        projectiles.clear(); damaging = null;
+    }
+}

src/main/java/games/dmg/fantasystick/ability/Revive.java

@@ -0,0 +1,374 @@
+package games.dmg.fantasystick.ability;
+
+import games.dmg.fantasystick.items.CharacterSheets;
+import games.dmg.fantasystick.items.TailBooks;
+import games.dmg.fantasystick.persistence.CharacterRecord;
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import games.dmg.fantasystick.persistence.RevivalStore;
+import games.dmg.fantasystick.progression.Stat;
+import games.dmg.fantasystick.session.ControlInput;
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.time.Clock;
+import java.time.Duration;
+import java.time.Instant;
+import java.time.temporal.ChronoUnit;
+import java.util.ArrayList;
+import java.util.IdentityHashMap;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.UUID;
+import java.util.concurrent.CompletableFuture;
+import java.util.function.Consumer;
+import net.kyori.adventure.text.Component;
+import org.bukkit.Location;
+import org.bukkit.Material;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.inventory.Inventory;
+import org.bukkit.inventory.ItemStack;
+
+/** Revive target selection, contained popup and proof-based Tail conversion. */
+public final class Revive implements AbilityEffect, Listener, AutoCloseable {
+    public interface PopupFactory { Inventory create(int size, Component title); }
+    private static final Duration DEATH_AGE = Duration.ofHours(24);
+    private static final Duration VIEW_TIME = Duration.ofMinutes(5);
+    private static final double RANGE = 12;
+    private record Candidate(int slot, ItemStack captured, TailBooks.Identity identity) { }
+    private record Choice(Candidate candidate, CharacterRecord record) { }
+
+    private final CharacterStorage characters;
+    private final RevivalStore reservations;
+    private final Clock clock;
+    private final Consumer<Runnable> nextTick;
+    private final PopupFactory popups;
+    private final Consumer<Throwable> failures;
+    private final TailBooks tails = new TailBooks();
+    private final CharacterSheets sheets = new CharacterSheets();
+    private final Map<Inventory, View> inventories = new IdentityHashMap<>();
+    private final Map<UUID, View> targets = new LinkedHashMap<>();
+    private boolean closed;
+
+    private final class View implements AutoCloseable {
+        final AbilityExecution execution;
+        final Player target;
+        final Inventory inventory;
+        final Map<Integer, Choice> choices;
+        boolean selecting;
+        boolean finished;
+        View(AbilityExecution execution, Player target, Inventory inventory, Map<Integer, Choice> choices) {
+            this.execution = execution; this.target = target; this.inventory = inventory; this.choices = choices;
+        }
+        @Override public void close() {
+            if (finished) return;
+            finished = true;
+            inventories.remove(inventory, this); targets.remove(target.getUniqueId(), this);
+            inventory.clear();
+            try { target.closeInventory(); } catch (RuntimeException failure) { report(failure); }
+        }
+    }
+
+    public Revive(CharacterStorage characters, RevivalStore reservations, Clock clock, Consumer<Runnable> nextTick,
+                  PopupFactory popups, Consumer<Throwable> failures) {
+        this.characters = Objects.requireNonNull(characters); this.reservations = Objects.requireNonNull(reservations);
+        this.clock = Objects.requireNonNull(clock); this.nextTick = Objects.requireNonNull(nextTick);
+        this.popups = Objects.requireNonNull(popups); this.failures = Objects.requireNonNull(failures);
+    }
+
+    public AbilityDefinition definition() {
+        return new AbilityDefinition("revive", "Revive", Material.ECHO_SHARD,
+            List.of("Let another player continue one fallen character.", "A valid cast spends the daily opportunity."),
+            "Use the equipped shard while aiming at another player within 12 blocks.",
+            Map.of(Stat.WIS, BigInteger.valueOf(30), Stat.CHR, BigInteger.valueOf(24), Stat.CON, BigInteger.valueOf(12)),
+            BigInteger.ONE, AbilityDefinition.Activation.SELECTION, ControlInput.Gesture.USE, Duration.ofHours(24),
+            Map.of("range", BigDecimal.valueOf(12), "selection-time", BigDecimal.valueOf(300),
+                "death-age", BigDecimal.valueOf(86400)),
+            AbilityDefinition.TargetPolicy.EXCEPTIONAL_NONCOMBAT_SELECTION, this);
+    }
+
+    @Override public boolean accepts(ControlInput input) { return !closed && target(input) != null; }
+
+    @Override public void activate(AbilityExecution execution) {
+        if (closed || !execution.stillCurrent()) { execution.finish(); return; }
+        Player target = target(execution.input());
+        if (target == null) {
+            execution.input().player().sendMessage("Revive found no eligible player within 12 blocks and line of sight.");
+            execution.finish(); return;
+        }
+        var captured = candidates(target);
+        if (captured.isEmpty()) {
+            execution.input().player().sendMessage("That player has no direct-inventory Tail eligible for Revive.");
+            execution.finish(); return;
+        }
+        var loads = captured.stream().map(candidate -> characters.find(candidate.identity().characterId())).toList();
+        CompletableFuture.allOf(loads.toArray(CompletableFuture[]::new)).whenComplete((ignored, failure) -> schedule(() -> {
+            if (failure != null) { report(failure); execution.input().player().sendMessage("Revive could not inspect those Tails safely."); execution.finish(); return; }
+            if (closed || !execution.stillCurrent() || !target.isOnline()) { execution.finish(); return; }
+            var eligible = new ArrayList<Choice>();
+            Instant now = clock.instant();
+            for (int index = 0; index < captured.size(); index++) {
+                var found = loads.get(index).join();
+                if (found.isEmpty()) continue;
+                var record = found.orElseThrow();
+                var candidate = captured.get(index);
+                if (eligible(record, candidate.identity(), now) && unchanged(target, candidate)) eligible.add(new Choice(candidate, record));
+            }
+            if (eligible.isEmpty()) {
+                execution.input().player().sendMessage("That player has no current Tail younger than 24 hours.");
+                execution.finish(); return;
+            }
+            open(execution, target, eligible, now);
+        }));
+    }
+
+    private Player target(ControlInput input) {
+        Player caster = input.player();
+        Entity supplied = input.target();
+        Player selected = supplied instanceof Player player ? player : null;
+        if (selected == null) {
+            Location eye = caster.getEyeLocation();
+            var hit = caster.getWorld().rayTraceEntities(eye, eye.getDirection(), RANGE,
+                entity -> entity instanceof Player && entity != caster);
+            if (hit != null && hit.getHitEntity() instanceof Player player) selected = player;
+        }
+        if (selected == null || selected == caster || !selected.isOnline() || selected.getWorld() != caster.getWorld()
+                || selected.getLocation().distanceSquared(caster.getLocation()) > RANGE * RANGE
+                || !caster.hasLineOfSight(selected)) return null;
+        return selected;
+    }
+
+    private List<Candidate> candidates(Player target) {
+        var result = new ArrayList<Candidate>();
+        for (int slot = 0; slot <= 40; slot++) {
+            if (slot > 35 && slot != 40) continue;
+            ItemStack item = target.getInventory().getItem(slot);
+            if (item == null || item.isEmpty()) continue;
+            var identity = tails.identify(item);
+            if (identity.isPresent()) result.add(new Candidate(slot, item.clone(), identity.orElseThrow()));
+        }
+        return List.copyOf(result);
+    }
+
+    private boolean eligible(CharacterRecord record, TailBooks.Identity identity, Instant now) {
+        if (!record.dead() || !record.id().equals(identity.characterId()) || !Objects.equals(record.deathId(), identity.deathId())) return false;
+        Duration age = Duration.between(record.diedAt(), now);
+        return !age.isNegative() && age.compareTo(DEATH_AGE) < 0;
+    }
+
+    private boolean unchanged(Player target, Candidate candidate) {
+        ItemStack current = target.getInventory().getItem(candidate.slot());
+        return current != null && current.equals(candidate.captured());
+    }
+
+    private void open(AbilityExecution execution, Player target, List<Choice> eligible, Instant now) {
+        View old = targets.get(target.getUniqueId()); if (old != null) old.execution.finish();
+        int size = Math.min(54, Math.max(9, ((eligible.size() + 8) / 9) * 9));
+        Inventory inventory = popups.create(size, Component.text("Choose a Tail to Revive"));
+        var choices = new LinkedHashMap<Integer, Choice>();
+        for (int index = 0; index < eligible.size() && index < size; index++) {
+            Choice choice = eligible.get(index); ItemStack display = choice.candidate().captured().clone(); display.setAmount(1);
+            var meta = display.getItemMeta();
+            long seconds = Math.max(0, Duration.between(now, choice.record().diedAt().plus(DEATH_AGE)).toSeconds());
+            meta.lore(List.of(Component.text("Level " + choice.record().level()),
+                Component.text("Eligible for " + seconds + " more seconds"), Component.text("Click to continue this character")));
+            display.setItemMeta(meta); inventory.setItem(index, display); choices.put(index, choice);
+        }
+        var view = new View(execution, target, inventory, Map.copyOf(choices));
+        inventories.put(inventory, view); targets.put(target.getUniqueId(), view); execution.own(view);
+        target.openInventory(inventory);
+        execution.later(VIEW_TIME, execution::finish);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST)
+    public void click(org.bukkit.event.inventory.InventoryClickEvent event) {
+        var view = inventories.get(event.getView().getTopInventory());
+        if (view == null) return;
+        event.setCancelled(true);
+        if (event.getWhoClicked() != view.target || event.getRawSlot() < 0 || event.getRawSlot() >= view.inventory.getSize()) return;
+        Choice choice = view.choices.get(event.getRawSlot());
+        if (choice == null || view.selecting) return;
+        view.selecting = true; inventories.remove(view.inventory, view); targets.remove(view.target.getUniqueId(), view);
+        view.inventory.clear(); view.target.closeInventory();
+        confirm(view, choice);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST)
+    public void drag(org.bukkit.event.inventory.InventoryDragEvent event) {
+        var view = inventories.get(event.getView().getTopInventory());
+        if (view != null && event.getRawSlots().stream().anyMatch(slot -> slot < view.inventory.getSize())) event.setCancelled(true);
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void close(org.bukkit.event.inventory.InventoryCloseEvent event) {
+        var view = inventories.get(event.getView().getTopInventory());
+        if (view != null && !view.selecting) view.execution.finish();
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void quit(org.bukkit.event.player.PlayerQuitEvent event) {
+        var targetView = targets.get(event.getPlayer().getUniqueId()); if (targetView != null) targetView.execution.finish();
+        for (var view : List.copyOf(inventories.values())) {
+            if (view.execution.input().player() == event.getPlayer()) view.execution.finish();
+        }
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void join(org.bukkit.event.player.PlayerJoinEvent event) { reconcile(event.getPlayer()); }
+
+    private void confirm(View view, Choice choice) {
+        if (closed || !view.execution.stillCurrent() || !view.target.isOnline() || !unchanged(view.target, choice.candidate())) {
+            view.execution.finish(); return;
+        }
+        characters.find(choice.record().id()).whenComplete((found, failure) -> schedule(() -> {
+            if (failure != null) { report(failure); view.execution.input().player().sendMessage("Revive could not recheck that Tail; no item changed."); view.execution.finish(); return; }
+            if (closed || !view.execution.stillCurrent() || !view.target.isOnline() || found.isEmpty()
+                    || !eligible(found.orElseThrow(), choice.candidate().identity(), clock.instant())
+                    || !unchanged(view.target, choice.candidate())) {
+                view.execution.input().player().sendMessage("That Tail is no longer eligible; no item changed.");
+                view.execution.finish(); return;
+            }
+            reserve(view, choice.candidate(), found.orElseThrow());
+        }));
+    }
+
+    private void reserve(View view, Candidate candidate, CharacterRecord dead) {
+        ItemStack source = view.target.getInventory().getItem(candidate.slot());
+        int destination = source.getAmount() == 1 ? -1 : emptyDirectSlot(view.target, candidate.slot());
+        if (source.getAmount() > 1 && destination < 0) {
+            view.target.sendMessage("Revive needs one empty direct inventory slot to preserve the copied Tails.");
+            view.execution.finish(); return;
+        }
+        var reservation = new RevivalStore.Reservation(UUID.randomUUID(), view.execution.character().id(),
+            view.target.getUniqueId(), dead.id(), dead.deathId(), clock.instant().truncatedTo(ChronoUnit.SECONDS),
+            candidate.slot(), source.getAmount(), destination);
+        reservations.reserve(reservation).whenComplete((reserved, failure) -> schedule(() -> {
+            if (failure != null) { report(failure); view.execution.input().player().sendMessage("Revive reservation could not be saved; no Tail changed."); view.execution.finish(); return; }
+            if (reserved.isEmpty() || closed || !view.execution.stillCurrent() || !view.target.isOnline()
+                    || !unchanged(view.target, candidate)) {
+                view.execution.input().player().sendMessage("Revive selection became stale after reservation; no Tail was changed.");
+                view.execution.finish(); return;
+            }
+            deliver(view, dead, reservation);
+        }));
+    }
+
+    private int emptyDirectSlot(Player target, int source) {
+        for (int slot = 0; slot <= 40; slot++) {
+            if (slot > 35 && slot != 40 || slot == source) continue;
+            ItemStack item = target.getInventory().getItem(slot);
+            if (item == null || item.isEmpty()) return slot;
+        }
+        return -1;
+    }
+
+    private void deliver(View view, CharacterRecord dead, RevivalStore.Reservation reservation) {
+        try {
+            var provisional = new CharacterRecord(dead.id(), dead.name(), dead.revision(), dead.stats(), dead.level(), dead.experience(),
+                dead.unspentPoints(), dead.maximumHealth(), dead.learned(), dead.loadout(), dead.cooldowns(), dead.restrictedKills(),
+                false, dead.deathId(), dead.diedAt());
+            ItemStack sheet = sheets.create(provisional);
+            ItemStack source = view.target.getInventory().getItem(reservation.sourceSlot());
+            if (reservation.sourceAmount() == 1) view.target.getInventory().setItem(reservation.sourceSlot(), sheet);
+            else {
+                view.target.getInventory().setItem(reservation.destinationSlot(), sheet);
+                var remaining = source.clone(); remaining.setAmount(reservation.sourceAmount() - 1);
+                view.target.getInventory().setItem(reservation.sourceSlot(), remaining);
+            }
+            view.target.updateInventory();
+        } catch (RuntimeException uncertain) {
+            report(uncertain); view.target.sendMessage("Revive item delivery is uncertain; retained proof requires recovery.");
+            view.execution.finish(); return;
+        }
+        var nativeLimit = games.dmg.fantasystick.session.NativeHealthLimit.read();
+        characters.restoreDeathRecord(reservation.character(), reservation.death(), nativeLimit)
+            .whenComplete((restored, failure) -> schedule(() -> {
+                if (failure != null || restored.isEmpty()) {
+                    if (failure != null) report(failure);
+                    view.target.sendMessage("The Tail changed, but character restoration is pending recovery; do not move the sheet.");
+                    view.execution.finish(); return;
+                }
+                if (installFinalSheet(view.target, restored.orElseThrow())) {
+                    reservations.clear(reservation.character(), reservation.id()).exceptionally(failure2 -> { report(failure2); return false; });
+                    view.target.sendMessage("Restored character sheet: " + restored.orElseThrow().name() + ".");
+                    view.execution.input().player().sendMessage("Revive restored " + restored.orElseThrow().name() + ".");
+                } else view.target.sendMessage("Character restoration was saved, but sheet custody is ambiguous; retained proof requires recovery.");
+                view.execution.finish();
+            }));
+    }
+
+    private boolean installFinalSheet(Player target, CharacterRecord record) {
+        int slot = uniqueSheetSlot(target, record.id());
+        if (slot < 0) return false;
+        target.getInventory().setItem(slot, sheets.create(record)); target.updateInventory(); return true;
+    }
+
+    private int uniqueSheetSlot(Player target, UUID character) {
+        int found = -1;
+        for (int slot = 0; slot <= 40; slot++) {
+            if (slot > 35 && slot != 40) continue;
+            if (sheets.identify(target.getInventory().getItem(slot)).filter(character::equals).isEmpty()) continue;
+            if (found >= 0) return -2;
+            found = slot;
+        }
+        return found;
+    }
+
+    public void reconcile(Player target) {
+        if (closed || !target.isOnline()) return;
+        reservations.target(target.getUniqueId()).whenComplete((found, failure) -> {
+            if (failure != null) { report(failure); return; }
+            for (var reservation : found) characters.find(reservation.character()).whenComplete((record, loadFailure) -> schedule(() -> {
+                if (loadFailure != null) { report(loadFailure); return; }
+                if (closed || !target.isOnline() || record.isEmpty()) return;
+                reconcile(target, reservation, record.orElseThrow());
+            }));
+        });
+    }
+
+    private void reconcile(Player target, RevivalStore.Reservation reservation, CharacterRecord record) {
+        int foundSheet = uniqueSheetSlot(target, reservation.character());
+        boolean hasSheet = foundSheet >= 0;
+        ItemStack source = target.getInventory().getItem(reservation.sourceSlot());
+        boolean unchangedTail = source != null && source.getAmount() == reservation.sourceAmount()
+            && tails.identify(source).filter(id -> id.characterId().equals(reservation.character()) && id.deathId().equals(reservation.death())).isPresent();
+        boolean consumedTail = reservation.sourceAmount() == 1 ? hasSheet
+            : source != null && source.getAmount() == reservation.sourceAmount() - 1
+                && tails.identify(source).filter(id -> id.deathId().equals(reservation.death())).isPresent();
+        if (!record.dead() && hasSheet && installFinalSheet(target, record)) {
+            reservations.clear(reservation.character(), reservation.id()); return;
+        }
+        if (record.dead() && unchangedTail && !hasSheet) {
+            reservations.clear(reservation.character(), reservation.id()); return;
+        }
+        if (record.dead() && hasSheet && (consumedTail || unchangedTail && reservation.sourceAmount() > 1)) {
+            if (unchangedTail && reservation.sourceAmount() > 1) {
+                var remaining = source.clone(); remaining.setAmount(source.getAmount() - 1);
+                target.getInventory().setItem(reservation.sourceSlot(), remaining); target.updateInventory();
+            }
+            var nativeLimit = games.dmg.fantasystick.session.NativeHealthLimit.read();
+            characters.restoreDeathRecord(reservation.character(), reservation.death(), nativeLimit)
+                .whenComplete((restored, failure) -> schedule(() -> {
+                    if (failure != null) { report(failure); return; }
+                    if (restored.isPresent() && installFinalSheet(target, restored.orElseThrow())) {
+                        reservations.clear(reservation.character(), reservation.id());
+                    }
+                }));
+        }
+    }
+
+    private void schedule(Runnable action) {
+        try { nextTick.accept(action); } catch (RuntimeException rejected) { report(rejected); }
+    }
+    private void report(Throwable failure) { try { failures.accept(failure); } catch (RuntimeException ignored) { } }
+
+    @Override public void close() {
+        if (closed) return; closed = true;
+        for (var view : List.copyOf(inventories.values())) view.execution.finish();
+        inventories.clear(); targets.clear();
+    }
+}

src/main/java/games/dmg/fantasystick/book/BookPagination.java

@@ -0,0 +1,37 @@
+package games.dmg.fantasystick.book;
+
+import java.util.ArrayList;
+import java.util.List;
+import net.kyori.adventure.text.Component;
+
+/** Plain native book pages, conservatively bounded for the vanilla font (no styled/bold text). */
+public final class BookPagination {
+    private BookPagination() { }
+
+    public static List<Component> pages(String text) {
+        var lines = new ArrayList<String>();
+        var line = new StringBuilder();
+        int width = 0;
+        for (int offset = 0; offset < text.length();) {
+            int codePoint = text.codePointAt(offset);
+            offset += Character.charCount(codePoint);
+            if (codePoint == '\n') {
+                lines.add(line.toString()); line.setLength(0); width = 0;
+                continue;
+            }
+            // ASCII is at most six pixels; vanilla's Unicode fallback is at most nine.
+            // Leave six pixels of horizontal slack and one line of vertical slack.
+            int advance = codePoint < 128 ? 6 : 9;
+            if (width + advance > 108) {
+                lines.add(line.toString()); line.setLength(0); width = 0;
+            }
+            line.appendCodePoint(codePoint); width += advance;
+        }
+        lines.add(line.toString());
+        var pages = new ArrayList<Component>();
+        for (int start = 0; start < lines.size(); start += 13) {
+            pages.add(Component.text(String.join("\n", lines.subList(start, Math.min(start + 13, lines.size())))));
+        }
+        return List.copyOf(pages);
+    }
+}

src/main/java/games/dmg/fantasystick/book/CharacterBookController.java

@@ -0,0 +1,353 @@
+package games.dmg.fantasystick.book;
+
+import games.dmg.fantasystick.persistence.CharacterRecord;
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import games.dmg.fantasystick.progression.ProgressionRules;
+import games.dmg.fantasystick.progression.Stat;
+import games.dmg.fantasystick.session.ControlInput;
+import games.dmg.fantasystick.session.NativeHealthLimit;
+import java.util.Map;
+import java.util.Objects;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.function.Consumer;
+import net.kyori.adventure.text.Component;
+import org.bukkit.Material;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.BookMeta;
+
+/** Authoritative inspection, permanent-stat purchases and validated party controls. */
+public final class CharacterBookController implements Consumer<ControlInput>, AutoCloseable, org.bukkit.event.Listener {
+    public record Failure(UUID player, UUID character, Throwable cause) { }
+    private final CharacterStorage characters;
+    private final ProgressionRules rules;
+    private final games.dmg.fantasystick.session.EquipmentSessions sessions;
+    private final PartyBookControls partyControls;
+    private final Consumer<Runnable> nextTick;
+    private final Consumer<Failure> failures;
+    private final games.dmg.fantasystick.ability.AbilityRegistry abilities;
+    private final games.dmg.fantasystick.ability.AbilityEngine abilityEngine;
+    private final Map<UUID, Object> pending = new ConcurrentHashMap<>();
+    private volatile boolean closed;
+    private static final int VOLUME_SIZE = 80; // Leave room for navigation and the bounded party pages.
+    private static final net.kyori.adventure.key.Key PAGES = net.kyori.adventure.key.Key.key("fantasystick", "character_pages");
+    private static final net.kyori.adventure.key.Key STATS = net.kyori.adventure.key.Key.key("fantasystick", "character_stat");
+    private static final net.kyori.adventure.key.Key ABILITY_UNLOCK = net.kyori.adventure.key.Key.key("fantasystick", "ability_unlock");
+    private static final net.kyori.adventure.key.Key ABILITY_ASSIGN = net.kyori.adventure.key.Key.key("fantasystick", "ability_assign");
+    private static final net.kyori.adventure.key.Key ABILITY_UNLEARN = net.kyori.adventure.key.Key.key("fantasystick", "ability_unlearn");
+    private static final java.util.regex.Pattern PAGE_PAYLOAD = java.util.regex.Pattern.compile("\"([a-f0-9-]{36}):([01])\"");
+    private static final java.util.regex.Pattern STAT_PAYLOAD = java.util.regex.Pattern.compile("\"([a-f0-9-]{36}):(STR|DEX|CON|INT|WIS|CHR)\"");
+    private static final java.util.regex.Pattern ABILITY_PAYLOAD = java.util.regex.Pattern.compile("\"([a-f0-9-]{36}):([a-z][a-z0-9_]{0,63})(?::([0-6]))?\"");
+    private record View(String nonce, ControlInput input, int previous, int next) { }
+    private record StatView(String nonce, ControlInput input, java.math.BigInteger revision) { }
+    private record AbilityView(String nonce, ControlInput input, java.math.BigInteger revision, java.util.Set<String> ids) { }
+    private final Map<UUID, View> views = new ConcurrentHashMap<>();
+    private final Map<UUID, StatView> statViews = new ConcurrentHashMap<>();
+    private final Map<UUID, AbilityView> abilityViews = new ConcurrentHashMap<>();
+
+    /** Scheduler must always defer to the server thread. Diagnostics must not access players or throw. */
+    public CharacterBookController(CharacterStorage characters, ProgressionRules rules,
+                                   games.dmg.fantasystick.session.EquipmentSessions sessions,
+                                   Consumer<Runnable> nextTick, Consumer<Failure> failures, games.dmg.fantasystick.party.PartyRoster parties,
+                                   org.bukkit.Server server, java.util.function.Function<UUID, Component> names) {
+        this(characters, rules, sessions, nextTick, failures, parties, server, names,
+            new games.dmg.fantasystick.ability.AbilityRegistry(), null);
+    }
+
+    public CharacterBookController(CharacterStorage characters, ProgressionRules rules,
+                                   games.dmg.fantasystick.session.EquipmentSessions sessions,
+                                   Consumer<Runnable> nextTick, Consumer<Failure> failures, games.dmg.fantasystick.party.PartyRoster parties,
+                                   org.bukkit.Server server, java.util.function.Function<UUID, Component> names,
+                                   games.dmg.fantasystick.ability.AbilityRegistry abilities,
+                                   games.dmg.fantasystick.ability.AbilityEngine abilityEngine) {
+        this.characters = Objects.requireNonNull(characters);
+        this.rules = Objects.requireNonNull(rules);
+        this.sessions = Objects.requireNonNull(sessions);
+        this.nextTick = Objects.requireNonNull(nextTick);
+        this.failures = Objects.requireNonNull(failures);
+        this.abilities = Objects.requireNonNull(abilities);
+        this.abilityEngine = abilityEngine;
+        this.partyControls = new PartyBookControls(parties, server, names, this::accept, this::report);
+    }
+
+    @Override public void accept(ControlInput input) { load(input, 0); }
+
+    private void load(ControlInput input, int offset) {
+        if (closed || input.kind() != ControlInput.Kind.BOOK || input.gesture() != ControlInput.Gesture.USE
+                || !input.stillCurrent()) return;
+        var owner = input.session().player();
+        partyControls.forget(owner);
+        views.remove(owner);
+        statViews.remove(owner);
+        abilityViews.remove(owner);
+        Object ticket = new Object();
+        pending.put(owner, ticket);
+        characters.find(input.session().character()).whenComplete((record, failure) -> {
+            if (closed || pending.get(owner) != ticket) return;
+            try {
+                nextTick.accept(() -> {
+                    if (closed || !pending.remove(owner, ticket) || !input.stillCurrent()) return;
+                    if (failure != null) {
+                        report(input, failure);
+                        input.player().sendMessage("Character book could not be loaded; no character state was changed.");
+                        return;
+                    }
+                    if (record.isEmpty() || record.orElseThrow().dead()) {
+                        input.player().sendMessage("This character is no longer available.");
+                        return;
+                    }
+                    try { input.player().openBook(render(record.orElseThrow(), input, offset)); }
+                    catch (RuntimeException error) { partyControls.forget(owner); views.remove(owner); report(input, error); }
+                });
+            } catch (RuntimeException rejected) {
+                pending.remove(owner, ticket);
+                report(input, rejected);
+            }
+        });
+    }
+
+    private ItemStack render(CharacterRecord record, ControlInput input, int offset) {
+        var first = new StringBuilder(record.name()).append("\n\n");
+        for (var stat : Stat.values()) first.append(stat).append(": ").append(record.stats().get(stat)).append('\n');
+        var maximum = record.maximumHealth().min(NativeHealthLimit.read());
+        String xp = record.level() >= rules.maximumLevel() ? "MAX"
+            : record.experience().remainder(rules.xpPerLevel()) + "/" + rules.xpPerLevel();
+        String learned = record.learned().isEmpty() ? "none" : String.join(", ", record.learned().stream().sorted().toList());
+        String second = "Level: " + record.level() + "\nXP: " + xp + "\nUnspent points: " + record.unspentPoints()
+            + "\nHealth: " + java.math.BigDecimal.valueOf(input.player().getHealth()).min(maximum).stripTrailingZeros().toPlainString()
+            + "/" + maximum.stripTrailingZeros().toPlainString()
+            + "\n\nAbilities: " + learned;
+        var item = new ItemStack(Material.WRITTEN_BOOK);
+        var meta = (BookMeta) item.getItemMeta();
+        meta.setTitle("Character");
+        meta.setAuthor("Fantasy Stick");
+        var all = BookPagination.pages(first + "\n" + second);
+        int start = Math.min(offset, (all.size() - 1) / VOLUME_SIZE * VOLUME_SIZE);
+        int end = Math.min(start + VOLUME_SIZE, all.size());
+        var pages = new java.util.ArrayList<Component>(all.subList(start, end));
+        var statView = new StatView(UUID.randomUUID().toString(), input, record.revision());
+        statViews.put(input.session().player(), statView);
+        Component purchases = Component.text("Spend 1 point\n\n");
+        for (var stat : Stat.values()) {
+            purchases = purchases.append(Component.text("[+1 " + stat + "]", net.kyori.adventure.text.format.NamedTextColor.DARK_GREEN)
+                .clickEvent(net.kyori.adventure.text.event.ClickEvent.custom(STATS,
+                    net.kyori.adventure.nbt.api.BinaryTagHolder.binaryTagHolder("\"" + statView.nonce() + ":" + stat + "\""))))
+                .append(Component.newline());
+        }
+        pages.add(purchases);
+        var definitions = abilities.definitions();
+        if (!definitions.isEmpty() && end == all.size()) {
+            var abilityView = new AbilityView(UUID.randomUUID().toString(), input, record.revision(),
+                definitions.stream().map(games.dmg.fantasystick.ability.AbilityDefinition::id)
+                    .collect(java.util.stream.Collectors.toUnmodifiableSet()));
+            abilityViews.put(input.session().player(), abilityView);
+            for (var definition : definitions) pages.addAll(abilityPages(record, definition, abilityView));
+        }
+        if (all.size() > VOLUME_SIZE) {
+            var view = new View(UUID.randomUUID().toString(), input, start > 0 ? start - VOLUME_SIZE : -1,
+                end < all.size() ? end : -1);
+            views.put(input.session().player(), view);
+            Component navigation = Component.text("Character pages\n\n" + (start + 1) + "–" + end + "/" + all.size());
+            if (view.previous() >= 0) navigation = navigation.append(Component.newline()).append(pageButton("Previous pages", view, 0));
+            if (view.next() >= 0) navigation = navigation.append(Component.newline()).append(pageButton("Next pages", view, 1));
+            pages.add(navigation);
+        }
+        pages.addAll(partyControls.pages(input));
+        meta.pages(pages);
+        item.setItemMeta(meta);
+        return item;
+    }
+
+    private static java.util.List<Component> abilityPages(CharacterRecord record,
+            games.dmg.fantasystick.ability.AbilityDefinition definition, AbilityView view) {
+        String requirements = definition.requirements().isEmpty() ? "none" : definition.requirements().entrySet().stream()
+            .sorted(Map.Entry.comparingByKey()).map(entry -> entry.getKey() + " " + entry.getValue())
+            .collect(java.util.stream.Collectors.joining(", "));
+        boolean learned = record.learned().contains(definition.id());
+        boolean stats = definition.requirements().entrySet().stream()
+            .allMatch(entry -> record.stats().get(entry.getKey()).compareTo(entry.getValue()) >= 0);
+        String state = learned ? "Learned" : !stats ? "Unavailable: requirements"
+            : record.unspentPoints().compareTo(definition.pointCost()) < 0 ? "Unavailable: points" : "Available";
+        String parameters = definition.parameters().isEmpty() ? "" : "\nParameters: " + definition.parameters().entrySet().stream()
+            .sorted(Map.Entry.comparingByKey()).map(entry -> entry.getKey() + "=" + entry.getValue())
+            .collect(java.util.stream.Collectors.joining(", "));
+        String text = definition.name() + "\nIcon: " + definition.icon().name()
+            + "\n\n" + String.join("\n", definition.lore()) + "\n\n" + definition.instructions()
+            + "\nRequires: " + requirements + "\nCost: " + definition.pointCost()
+            + "\nCooldown: " + definition.cooldown().toSeconds() + "s" + parameters + "\n\n" + state;
+        var pages = new java.util.ArrayList<>(BookPagination.pages(text));
+        if (!learned && stats && record.unspentPoints().compareTo(definition.pointCost()) >= 0) {
+            pages.add(Component.text("Ability action\n\n").append(abilityButton("Learn", ABILITY_UNLOCK, view, definition.id(), null)));
+        } else if (learned) {
+            Component action = Component.text("Assign ability\n\nSlot:\n");
+            for (int slot = 0; slot < 7; slot++) {
+                if (slot > 0) action = action.append(slot == 4 ? Component.newline() : Component.space());
+                action = action.append(abilityButton(Integer.toString(slot + 3), ABILITY_ASSIGN, view, definition.id(), slot));
+            }
+            action = action.append(Component.text("\n\nRefund: "))
+                .append(abilityButton("Unlearn", ABILITY_UNLEARN, view, definition.id(), null));
+            pages.add(action);
+        }
+        return java.util.List.copyOf(pages);
+    }
+
+    private static Component abilityButton(String label, net.kyori.adventure.key.Key action, AbilityView view,
+                                           String ability, Integer slot) {
+        String payload = "\"" + view.nonce() + ":" + ability + (slot == null ? "" : ":" + slot) + "\"";
+        return Component.text("[" + label + "]", net.kyori.adventure.text.format.NamedTextColor.DARK_GREEN)
+            .clickEvent(net.kyori.adventure.text.event.ClickEvent.custom(action,
+                net.kyori.adventure.nbt.api.BinaryTagHolder.binaryTagHolder(payload)));
+    }
+
+    private static Component pageButton(String label, View view, int direction) {
+        return Component.text("[" + label + "]", net.kyori.adventure.text.format.NamedTextColor.DARK_BLUE)
+            .clickEvent(net.kyori.adventure.text.event.ClickEvent.custom(PAGES,
+                net.kyori.adventure.nbt.api.BinaryTagHolder.binaryTagHolder("\"" + view.nonce() + ":" + direction + "\"")));
+    }
+
+    @org.bukkit.event.EventHandler
+    public void pageAction(io.papermc.paper.event.player.PlayerCustomClickEvent event) {
+        if (closed || !PAGES.equals(event.getIdentifier())
+                || !(event.getCommonConnection() instanceof io.papermc.paper.connection.PlayerGameConnection connection)) return;
+        var player = connection.getPlayer();
+        var view = views.get(player.getUniqueId());
+        if (view == null || view.input().player() != player || event.getTag() == null) return;
+        String raw = event.getTag().string();
+        if (raw.length() > 64) return;
+        var match = PAGE_PAYLOAD.matcher(raw);
+        if (!match.matches() || !view.nonce().equals(match.group(1))) return;
+        int offset = match.group(2).equals("0") ? view.previous() : view.next();
+        if (offset < 0 || !views.remove(player.getUniqueId(), view) || !view.input().stillCurrent()) return;
+        // Reread authoritative data, rather than retaining a stale giant character snapshot.
+        load(view.input(), offset);
+    }
+
+    private void report(ControlInput input, Throwable failure) {
+        try { failures.accept(new Failure(input.session().player(), input.session().character(), failure)); }
+        catch (RuntimeException ignored) { /* A diagnostic failure must not replay a book request. */ }
+    }
+
+    @org.bukkit.event.EventHandler
+    public void statAction(io.papermc.paper.event.player.PlayerCustomClickEvent event) {
+        if (closed || !STATS.equals(event.getIdentifier())
+                || !(event.getCommonConnection() instanceof io.papermc.paper.connection.PlayerGameConnection connection)) return;
+        var player = connection.getPlayer();
+        var view = statViews.get(player.getUniqueId());
+        if (view == null || view.input().player() != player || event.getTag() == null) return;
+        String raw = event.getTag().string();
+        if (raw.length() > 80) return;
+        var match = STAT_PAYLOAD.matcher(raw);
+        if (!match.matches() || !view.nonce().equals(match.group(1))
+                || !statViews.remove(player.getUniqueId(), view) || !view.input().stillCurrent()) return;
+        var stat = Stat.valueOf(match.group(2));
+        var currentHealth = java.math.BigDecimal.valueOf(player.getHealth());
+        var nativeLimit = NativeHealthLimit.read();
+        characters.purchaseStat(view.input().session().character(), view.revision(), stat, currentHealth, nativeLimit)
+            .whenComplete((purchase, failure) -> {
+                try {
+                    nextTick.accept(() -> finishPurchase(view, stat, purchase, failure));
+                } catch (RuntimeException rejected) { report(view.input(), rejected); }
+            });
+    }
+
+    private void finishPurchase(StatView view, Stat stat, CharacterStorage.StatPurchase purchase, Throwable failure) {
+        var input = view.input();
+        if (closed || !input.stillCurrent()) return;
+        if (failure != null) {
+            report(input, failure);
+            input.player().sendMessage("Stat purchase could not be saved; no character state was changed.");
+            return;
+        }
+        if (purchase.status() == CharacterStorage.StatPurchaseStatus.APPLIED) {
+            var saved = purchase.record().orElseThrow();
+            try {
+                if (!sessions.acknowledgeProgress(input.session(), view.revision(), saved)) {
+                    input.player().sendMessage("Stat purchase was saved; reopen the character after the session transition.");
+                    return;
+                }
+            } catch (RuntimeException nativeFailure) {
+                report(input, nativeFailure);
+                input.player().sendMessage("Stat purchase was saved, but native health refresh failed; exit for recovery.");
+                return;
+            }
+            input.player().sendMessage(stat + " increased to " + saved.stats().get(stat) + ".");
+            load(input, 0);
+            return;
+        }
+        String message = switch (purchase.status()) {
+            case STALE -> "That character page is stale; reopen it before spending points.";
+            case NO_POINTS -> "This character has no unspent points.";
+            case UNAVAILABLE -> "This character is no longer available.";
+            case APPLIED -> throw new IllegalStateException("Handled applied purchase");
+        };
+        input.player().sendMessage(message);
+        load(input, 0);
+    }
+
+    @org.bukkit.event.EventHandler
+    public void abilityAction(io.papermc.paper.event.player.PlayerCustomClickEvent event) {
+        boolean unlock = ABILITY_UNLOCK.equals(event.getIdentifier());
+        boolean assign = ABILITY_ASSIGN.equals(event.getIdentifier());
+        boolean unlearn = ABILITY_UNLEARN.equals(event.getIdentifier());
+        if (closed || abilityEngine == null || !unlock && !assign && !unlearn
+                || !(event.getCommonConnection() instanceof io.papermc.paper.connection.PlayerGameConnection connection)
+                || event.getTag() == null) return;
+        var player = connection.getPlayer();
+        var view = abilityViews.get(player.getUniqueId());
+        if (view == null || view.input().player() != player) return;
+        String raw = event.getTag().string();
+        if (raw.length() > 120) return;
+        var match = ABILITY_PAYLOAD.matcher(raw);
+        if (!match.matches() || !view.nonce().equals(match.group(1)) || !view.ids().contains(match.group(2))
+                || assign != (match.group(3) != null)
+                || !abilityViews.remove(player.getUniqueId(), view) || !view.input().stillCurrent()) return;
+        String ability = match.group(2);
+        var operation = unlock ? abilityEngine.purchase(view.input(), ability, view.revision())
+            : unlearn ? abilityEngine.unlearn(view.input(), ability, view.revision())
+            : abilityEngine.assign(view.input(), ability, Integer.parseInt(match.group(3)), view.revision());
+        operation.whenComplete((mutation, failure) -> {
+            if (closed || !view.input().stillCurrent()) return;
+            if (failure != null) {
+                report(view.input(), failure);
+                player.sendMessage("Ability change could not be confirmed; reopen the character after session recovery.");
+                return;
+            }
+            player.sendMessage(abilityMessage(unlock, unlearn, ability, mutation.status()));
+            load(view.input(), 0);
+        });
+    }
+
+    private static String abilityMessage(boolean unlock, boolean unlearn, String ability,
+                                         CharacterStorage.AbilityMutationStatus status) {
+        return switch (status) {
+            case APPLIED -> unlock ? "Learned " + ability + "."
+                : unlearn ? "Unlearned " + ability + " and refunded 1 point." : "Assigned " + ability + ".";
+            case UNCHANGED -> ability + " is already assigned there.";
+            case REQUIREMENTS -> "The purchased base-stat requirements are not met.";
+            case NO_POINTS -> "This character does not have enough unspent points.";
+            case ALREADY_LEARNED -> "This character already knows " + ability + ".";
+            case NOT_LEARNED -> unlearn ? "This character no longer knows " + ability + "."
+                : "Learn " + ability + " before assigning it.";
+            case STALE -> "That character page is stale; reopen it before changing abilities.";
+            case COOLDOWN -> "That ability is still on cooldown.";
+            case UNAVAILABLE -> "That character or ability is unavailable.";
+        };
+    }
+
+    @org.bukkit.event.EventHandler
+    public void partyAction(io.papermc.paper.event.player.PlayerCustomClickEvent event) { partyControls.click(event); }
+
+    @org.bukkit.event.EventHandler(priority = org.bukkit.event.EventPriority.MONITOR)
+    public void quit(org.bukkit.event.player.PlayerQuitEvent event) {
+        var owner = event.getPlayer().getUniqueId();
+        pending.remove(owner);
+        views.remove(owner);
+        statViews.remove(owner);
+        abilityViews.remove(owner);
+        partyControls.forget(owner);
+    }
+
+    @Override public void close() {
+        closed = true; pending.clear(); views.clear(); statViews.clear(); abilityViews.clear(); partyControls.close();
+    }
+}

src/main/java/games/dmg/fantasystick/book/PartyBookControls.java

@@ -0,0 +1,182 @@
+package games.dmg.fantasystick.book;
+
+import games.dmg.fantasystick.party.PartyRoster;
+import games.dmg.fantasystick.session.ControlInput;
+import io.papermc.paper.connection.PlayerGameConnection;
+import io.papermc.paper.event.player.PlayerCustomClickEvent;
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.UUID;
+import java.util.function.BiConsumer;
+import java.util.function.BooleanSupplier;
+import java.util.function.Consumer;
+import java.util.function.Function;
+import java.util.regex.Pattern;
+import net.kyori.adventure.key.Key;
+import net.kyori.adventure.nbt.api.BinaryTagHolder;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.event.ClickEvent;
+import net.kyori.adventure.text.format.NamedTextColor;
+import org.bukkit.Material;
+import org.bukkit.Server;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.BookMeta;
+
+/** One single-use view per player; client payloads select server-owned actions, never arbitrary UUIDs/commands. */
+public final class PartyBookControls implements AutoCloseable {
+    private static final Key ACTION = Key.key("fantasystick", "party_book");
+    private static final Pattern PAYLOAD = Pattern.compile("\"([a-f0-9-]{36}):([0-9]{1,3})\"");
+    private static final int PAGE_SIZE = 8;
+    private enum Menu { ROOT, PLAYERS, INVITATIONS }
+    private record View(String nonce, ControlInput input, List<Runnable> actions) {
+        private View { actions = List.copyOf(actions); }
+    }
+    private final Map<UUID, View> views = new HashMap<>();
+    private final PartyRoster parties;
+    private final Server server;
+    private final Function<UUID, Component> names;
+    private final Consumer<ControlInput> refresh;
+    private final BiConsumer<ControlInput, Throwable> failures;
+    private boolean closed;
+
+    public PartyBookControls(PartyRoster parties, Server server, Function<UUID, Component> names,
+                             Consumer<ControlInput> refresh, BiConsumer<ControlInput, Throwable> failures) {
+        this.parties = Objects.requireNonNull(parties);
+        this.server = Objects.requireNonNull(server);
+        this.names = Objects.requireNonNull(names);
+        this.refresh = Objects.requireNonNull(refresh);
+        this.failures = Objects.requireNonNull(failures);
+    }
+
+    public List<Component> pages(ControlInput input) { return render(input, Menu.ROOT, 0); }
+
+    private List<Component> render(ControlInput input, Menu menu, int offset) {
+        if (closed || !input.stillCurrent()) return List.of();
+        var build = new Pages(input);
+        var owner = input.session().player();
+        var party = parties.partyOf(owner);
+        if (menu == Menu.PLAYERS && (party.isEmpty() || !party.orElseThrow().leader().equals(owner))) menu = Menu.ROOT;
+        if (menu == Menu.ROOT) {
+            Component summary = Component.text("Party\n\n");
+            if (party.isEmpty()) {
+                summary = summary.append(build.button("Create party", () -> mutate(input, () -> parties.create(owner).isPresent())))
+                    .append(Component.newline()).append(build.button("Invitations", () -> show(input, Menu.INVITATIONS, 0)));
+                build.pages.add(summary);
+            } else {
+                var group = party.orElseThrow();
+                boolean leader = group.leader().equals(owner);
+                summary = summary.append(Component.text(group.members().size() + "/6 members\n\n"))
+                    .append(build.button("Leave party", () -> mutate(input, () -> parties.leave(owner, group.id()))));
+                if (leader) {
+                    summary = summary.append(Component.newline())
+                        .append(build.button("Disband party", () -> mutate(input, () -> parties.disband(owner, group.id()))));
+                    if (group.members().size() < 6) summary = summary.append(Component.newline())
+                        .append(build.button("Invite players", () -> show(input, Menu.PLAYERS, 0)));
+                }
+                build.pages.add(summary);
+                for (var member : group.members()) {
+                    Component row = Component.text(member.equals(group.leader()) ? "Leader\n\n" : "Member\n\n").append(names.apply(member));
+                    if (leader && !member.equals(owner)) row = row.append(Component.text("\n\n"))
+                        .append(build.button("Kick", () -> mutate(input, () -> parties.kick(owner, group.id(), member))));
+                    build.pages.add(row);
+                }
+            }
+        } else if (menu == Menu.PLAYERS) {
+            var group = party.orElseThrow();
+            var candidates = server.getOnlinePlayers().stream().filter(player -> player.isOnline())
+                .map(player -> player.getUniqueId()).filter(id -> parties.partyOf(id).isEmpty())
+                .sorted(Comparator.comparing(UUID::toString)).toList();
+            int start = start(offset, candidates.size());
+            build.navigation("Invite players", Menu.PLAYERS, start, candidates.size());
+            for (int i = start; i < Math.min(candidates.size(), start + PAGE_SIZE); i++) {
+                UUID target = candidates.get(i);
+                build.pages.add(Component.text("Invite\n\n").append(names.apply(target)).append(Component.text("\n\n"))
+                    .append(build.button("Invite", () -> mutate(input, () -> {
+                        boolean invited = parties.invite(owner, group.id(), target).isPresent();
+                        if (invited) {
+                            var recipient = server.getPlayer(target);
+                            if (recipient != null && recipient.isOnline()) recipient.sendMessage(
+                                "Party invitation received. Open your character book to accept within 60 seconds.");
+                        }
+                        return invited;
+                    }))));
+            }
+        } else {
+            var invitations = parties.invitationsFor(owner);
+            int start = start(offset, invitations.size());
+            build.navigation("Invitations", Menu.INVITATIONS, start, invitations.size());
+            for (int i = start; i < Math.min(invitations.size(), start + PAGE_SIZE); i++) {
+                var invitation = invitations.get(i);
+                build.pages.add(Component.text("Invitation from\n\n").append(names.apply(invitation.leader()))
+                    .append(Component.text("\n\n")).append(build.button("Accept",
+                        () -> mutate(input, () -> parties.accept(owner, invitation.id())))));
+            }
+        }
+        views.put(owner, new View(build.nonce, input, build.actions));
+        return List.copyOf(build.pages);
+    }
+
+    private static int start(int requested, int size) {
+        return Math.min(Math.max(0, requested), Math.max(0, (size - 1) / PAGE_SIZE * PAGE_SIZE));
+    }
+
+    private final class Pages {
+        final ControlInput input;
+        final String nonce = UUID.randomUUID().toString();
+        final List<Component> pages = new ArrayList<>();
+        final List<Runnable> actions = new ArrayList<>();
+        Pages(ControlInput input) { this.input = input; }
+        Component button(String label, Runnable action) {
+            int index = actions.size();
+            actions.add(action);
+            return Component.text("[" + label + "]", NamedTextColor.DARK_BLUE).clickEvent(ClickEvent.custom(ACTION,
+                BinaryTagHolder.binaryTagHolder("\"" + nonce + ":" + index + "\"")));
+        }
+        void navigation(String title, Menu menu, int start, int count) {
+            Component page = Component.text(title + "\n\n" + (count == 0 ? "None available\n\n" : ""))
+                .append(button("Character book", () -> refresh.accept(input)));
+            if (start > 0) page = page.append(Component.newline()).append(button("Previous", () -> show(input, menu, start - PAGE_SIZE)));
+            if (start + PAGE_SIZE < count) page = page.append(Component.newline()).append(button("Next", () -> show(input, menu, start + PAGE_SIZE)));
+            pages.add(page);
+        }
+    }
+
+    private void show(ControlInput input, Menu menu, int offset) {
+        var item = new ItemStack(Material.WRITTEN_BOOK);
+        var meta = (BookMeta) item.getItemMeta();
+        meta.setTitle("Party"); meta.setAuthor("Fantasy Stick");
+        meta.pages(render(input, menu, offset));
+        item.setItemMeta(meta);
+        input.player().openBook(item);
+    }
+
+    public void click(PlayerCustomClickEvent event) {
+        if (closed || !ACTION.equals(event.getIdentifier()) || !(event.getCommonConnection() instanceof PlayerGameConnection connection)) return;
+        var player = connection.getPlayer();
+        var view = views.get(player.getUniqueId());
+        if (view == null || view.input().player() != player) return;
+        var tag = event.getTag();
+        if (tag == null) return;
+        String raw = tag.string();
+        if (raw.length() > 64) return;
+        var match = PAYLOAD.matcher(raw);
+        if (!match.matches() || !view.nonce().equals(match.group(1))) return;
+        int index = Integer.parseInt(match.group(2));
+        if (index >= view.actions().size()) return;
+        views.remove(player.getUniqueId());
+        if (!view.input().stillCurrent()) return;
+        try { view.actions().get(index).run(); }
+        catch (RuntimeException failure) { forget(player.getUniqueId()); failures.accept(view.input(), failure); }
+    }
+
+    private void mutate(ControlInput input, BooleanSupplier operation) {
+        if (!operation.getAsBoolean()) input.player().sendMessage("Party action unavailable: membership, authority or invitation changed.");
+        refresh.accept(input);
+    }
+    public void forget(UUID player) { views.remove(player); }
+    @Override public void close() { closed = true; views.clear(); }
+}

src/main/java/games/dmg/fantasystick/combat/BasicAttack.java

@@ -0,0 +1,91 @@
+package games.dmg.fantasystick.combat;
+
+import games.dmg.fantasystick.progression.Stat;
+import games.dmg.fantasystick.session.ControlInput;
+import games.dmg.fantasystick.session.EquipmentSessions;
+import java.math.BigInteger;
+import java.time.Clock;
+import java.time.Duration;
+import java.time.Instant;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+import java.util.UUID;
+import java.util.function.Consumer;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.entity.EntityDamageByEntityEvent;
+
+/** Server-thread built-in attack consumer; the bound stick's vanilla attack is always contained upstream. */
+public final class BasicAttack implements Consumer<ControlInput>, Listener, AutoCloseable {
+    private static final Duration CADENCE = Duration.ofSeconds(1);
+    private final EquipmentSessions sessions;
+    private final Clock clock;
+    private final Map<UUID, Instant> readyAt = new HashMap<>();
+    private Pending pending;
+    private boolean closed;
+
+    private static final class Pending {
+        final ControlInput input;
+        final LivingEntity target;
+        final Instant attackedAt;
+        boolean accepted;
+        Pending(ControlInput input, LivingEntity target, Instant attackedAt) {
+            this.input = input; this.target = target; this.attackedAt = attackedAt;
+        }
+    }
+
+    public BasicAttack(EquipmentSessions sessions) {
+        this(sessions, Clock.systemUTC());
+    }
+
+    public BasicAttack(EquipmentSessions sessions, Clock clock) {
+        this.sessions = Objects.requireNonNull(sessions);
+        this.clock = Objects.requireNonNull(clock);
+    }
+
+    @Override public void accept(ControlInput input) {
+        if (closed || pending != null || input.kind() != ControlInput.Kind.BASIC_ATTACK
+                || input.gesture() != ControlInput.Gesture.ATTACK
+                || !(input.target() instanceof LivingEntity target) || !input.stillCurrent()) return;
+        var record = sessions.currentRecord(input.session()).orElse(null);
+        if (record == null) return;
+        Instant now = clock.instant();
+        Instant ready = readyAt.get(input.session().character());
+        if (ready != null && now.isBefore(ready)) return;
+        BigInteger damage = damage(record.stats().get(Stat.STR));
+        double nativeDamage = damage.bitLength() > 1023 ? Double.MAX_VALUE : damage.doubleValue();
+        var attempt = new Pending(input, target, now);
+        pending = attempt;
+        try {
+            target.damage(nativeDamage, input.player());
+        } finally {
+            if (pending == attempt) pending = null;
+            if (attempt.accepted) readyAt.put(input.session().character(), attempt.attackedAt.plus(CADENCE));
+        }
+    }
+
+    static BigInteger damage(BigInteger strength) {
+        Objects.requireNonNull(strength);
+        if (strength.signum() < 0) throw new IllegalArgumentException("Strength must not be negative");
+        return strength.subtract(BigInteger.TEN).divide(BigInteger.TWO).max(BigInteger.ONE);
+    }
+
+    /** MONITOR observes the synchronous native result; cancelled/zero damage never spends cadence. */
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void acceptedDamage(EntityDamageByEntityEvent event) {
+        var attempt = pending;
+        if (closed || attempt == null || event.isCancelled() || event.getFinalDamage() <= 0
+                || event.getDamager() != attempt.input.player() || event.getEntity() != attempt.target
+                || !attempt.input.stillCurrent() || !sessions.current(attempt.input.session())) return;
+        attempt.accepted = true;
+    }
+
+    @Override public void close() {
+        closed = true;
+        pending = null;
+        readyAt.clear();
+    }
+}

src/main/java/games/dmg/fantasystick/crafting/CharacterAnvilNames.java

@@ -0,0 +1,59 @@
+package games.dmg.fantasystick.crafting;
+
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import games.dmg.fantasystick.items.CharacterSheets;
+import org.bukkit.inventory.ItemStack;
+import java.util.UUID;
+import java.util.function.Consumer;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.purpurmc.purpur.event.inventory.AnvilTakeResultEvent;
+
+/** Observes the native accepted-take boundary; does not replace vanilla movement, XP cost or anvil damage. */
+public final class CharacterAnvilNames implements Listener {
+    public record Failure(UUID player, UUID character, Throwable cause) { }
+    private final CharacterStorage storage;
+    private final Consumer<Failure> failures;
+    private final org.bukkit.inventory.ItemFactory items;
+    private final Consumer<games.dmg.fantasystick.persistence.CharacterRecord> acknowledged;
+
+    /** Diagnostics may run on the persistence worker and must not access native player state. */
+    public CharacterAnvilNames(CharacterStorage storage, Consumer<Failure> failures, org.bukkit.inventory.ItemFactory items) {
+        this(storage, failures, items, ignored -> { });
+    }
+
+    /** Acknowledgments run after file commit, possibly on the worker; never access Bukkit in that callback. */
+    public CharacterAnvilNames(CharacterStorage storage, Consumer<Failure> failures, org.bukkit.inventory.ItemFactory items,
+                               Consumer<games.dmg.fantasystick.persistence.CharacterRecord> acknowledged) {
+        this.items = java.util.Objects.requireNonNull(items);
+        this.storage = java.util.Objects.requireNonNull(storage);
+        this.failures = java.util.Objects.requireNonNull(failures);
+        this.acknowledged = java.util.Objects.requireNonNull(acknowledged);
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void onTaken(AnvilTakeResultEvent event) {
+        var sheets = new CharacterSheets();
+        var result = event.getResult();
+        var id = sheets.identify(result);
+        if (id.isEmpty()) return;
+        var input = event.getInventory().getItem(0);
+        if (!id.equals(sheets.identify(input))) return;
+        String name = name(result);
+        if (name.equals(name(input))) return;
+        var player = event.getPlayer().getUniqueId();
+        var character = id.orElseThrow();
+        storage.renameCharacter(character, name).whenComplete((renamed, failure) -> {
+            if (failure != null || renamed.isEmpty()) { failures.accept(new Failure(player, character, failure)); return; }
+            try { acknowledged.accept(renamed.orElseThrow()); }
+            catch (RuntimeException | LinkageError error) { failures.accept(new Failure(player, character, error)); }
+        });
+    }
+
+    private String name(ItemStack sheet) {
+        var custom = sheet.getItemMeta().customName();
+        return custom == null ? items.getI18NDisplayName(sheet)
+            : net.kyori.adventure.text.serializer.plain.PlainTextComponentSerializer.plainText().serialize(custom);
+    }
+}

src/main/java/games/dmg/fantasystick/crafting/CharacterFactory.java

@@ -0,0 +1,39 @@
+package games.dmg.fantasystick.crafting;
+
+import games.dmg.fantasystick.persistence.CharacterRecord;
+import games.dmg.fantasystick.progression.CharacterProgress;
+import games.dmg.fantasystick.progression.ProgressionRules;
+import java.util.Collections;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.UUID;
+import java.util.function.Supplier;
+import java.util.random.RandomGenerator;
+
+/** Allocation only; invoke for an accepted craft, never for recipe previews or activation. */
+public final class CharacterFactory {
+    private static final String[] GIVEN_NAMES = {"Ari", "Bryn", "Elin", "Finn", "Iris", "Kael", "Mira", "Neris",
+        "Orin", "Rhea", "Soren", "Tala", "Vera", "Wren", "Yara", "Zev"};
+    private static final String[] FAMILY_NAMES = {"Ash", "Birch", "Brook", "Dawn", "Ember", "Fern", "Flint", "Glen",
+        "Hollow", "Lark", "Mist", "Reed", "Stone", "Thorn", "Vale", "Willow"};
+    private final Supplier<UUID> identities;
+    private final RandomGenerator names;
+
+    public CharacterFactory() { this(UUID::randomUUID, RandomGenerator.getDefault()); }
+
+    CharacterFactory(Supplier<UUID> identities, RandomGenerator names) {
+        this.identities = Objects.requireNonNull(identities);
+        this.names = Objects.requireNonNull(names);
+    }
+
+    public synchronized CharacterRecord create(ProgressionRules rules) {
+        Objects.requireNonNull(rules);
+        var initial = new CharacterProgress(identities.get(), rules).snapshot();
+        String name = GIVEN_NAMES[names.nextInt(GIVEN_NAMES.length)] + " "
+            + FAMILY_NAMES[names.nextInt(FAMILY_NAMES.length)];
+        return new CharacterRecord(initial.characterId(), name, initial.revision(), initial.stats(),
+            initial.level(), initial.experience(), initial.unspentPoints(), initial.currentHealth(),
+            Set.of(), Collections.nCopies(7, ""), Map.of(), false, null, null);
+    }
+}

src/main/java/games/dmg/fantasystick/crafting/ManualCraftDelivery.java

@@ -0,0 +1,39 @@
+package games.dmg.fantasystick.crafting;
+
+import games.dmg.fantasystick.items.CharacterSheets;
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import org.bukkit.inventory.CraftingInventory;
+import org.bukkit.inventory.InventoryView;
+
+/**
+ * Fixed-destination adapter for the pinned Purpur runtime, not a listener or a portable transaction API.
+ * Call on the server thread after event containment/lifecycle authorization. Supply the player's actual
+ * current open view, never a retained event's view. Close/reopen generations remain the caller's duty.
+ * World drops are deliberately unsupported here. The caller synchronizes the client after completion.
+ */
+public final class ManualCraftDelivery {
+    public enum Result { DELIVERED, STALE, UNAVAILABLE, UNSUPPORTED_ROUTE }
+
+    private ManualCraftDelivery() { }
+
+    public static Result commit(ManualCraftPlan plan, CharacterStorage.CraftBatch batch, InventoryView current) {
+        if (plan.route() == ManualCraftPlan.Route.DROP) return Result.UNSUPPORTED_ROUTE;
+        if (!plan.matches(current)) return Result.STALE;
+        var records = batch.claimForDelivery(plan.quantity());
+        if (records.isEmpty()) return Result.UNAVAILABLE;
+        var sheets = new CharacterSheets();
+        var outputs = records.orElseThrow().stream().map(sheets::create).toList();
+        var grid = (CraftingInventory) current.getTopInventory();
+        var inputs = grid.getMatrix();
+        // Purpur 2618: these are native mirrors; count changes do not call slotsChanged.
+        for (var item : inputs) if (item != null && !item.isEmpty()) item.setAmount(item.getAmount() - plan.quantity());
+        if (plan.route() == ManualCraftPlan.Route.CURSOR) current.setCursor(outputs.getFirst());
+        else for (int index = 0; index < outputs.size(); index++) {
+            current.getBottomInventory().setItem(plan.inventorySlots().get(index), outputs.get(index));
+        }
+        // One adapter-triggered recomputation after ALL debits and placements, including exhausted cells.
+        // Do not make further planned inventory writes after this synchronous callback boundary.
+        grid.setItem(1, inputs[0]);
+        return Result.DELIVERED;
+    }
+}

src/main/java/games/dmg/fantasystick/crafting/ManualCraftPlan.java

@@ -0,0 +1,158 @@
+package games.dmg.fantasystick.crafting;
+
+import games.dmg.fantasystick.items.CharacterSheets;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.EnumSet;
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+import org.bukkit.Keyed;
+import org.bukkit.Material;
+import org.bukkit.event.inventory.ClickType;
+import org.bukkit.event.inventory.CraftItemEvent;
+import org.bukkit.event.inventory.InventoryAction;
+import org.bukkit.event.inventory.InventoryType;
+import org.bukkit.inventory.CraftingInventory;
+import org.bukkit.inventory.InventoryView;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.PlayerInventory;
+import org.bukkit.inventory.Recipe;
+
+/** Server-thread planning only: does not save, mint, cancel, consume or deliver anything. */
+public final class ManualCraftPlan {
+    public enum Route { CURSOR, INVENTORY, DROP }
+    private final ItemStack[] matrix;
+    private final InventoryView view;
+    private final CraftingInventory grid;
+    private final PlayerInventory inventory;
+    private final ItemStack result;
+    private final ItemStack cursor;
+    private final int quantity;
+    private final Route route;
+    private final List<Integer> inventorySlots;
+
+    private ManualCraftPlan(CraftItemEvent event, ItemStack[] matrix, int quantity, Route route, List<Integer> inventorySlots) {
+        this.view = event.getView();
+        this.grid = event.getInventory();
+        this.inventory = (PlayerInventory) view.getBottomInventory();
+        this.result = copy(grid.getResult());
+        this.cursor = copy(view.getCursor());
+        this.matrix = copy(matrix);
+        this.quantity = quantity;
+        this.route = route;
+        this.inventorySlots = List.copyOf(inventorySlots);
+    }
+
+    public static Optional<ManualCraftPlan> capture(CraftItemEvent event) {
+        if (event.isCancelled() || event.getRawSlot() != 0 || event.getSlotType() != InventoryType.SlotType.RESULT
+                || !isSheetRecipe(event.getRecipe())
+                || !(event.getView().getTopInventory() instanceof CraftingInventory)
+                || !isSheetRecipe(event.getInventory().getRecipe())
+                || !(event.getView().getBottomInventory() instanceof PlayerInventory)
+                || empty(event.getCurrentItem()) || !event.getRecipe().getResult().equals(event.getCurrentItem())
+                || !new CharacterSheets().recipe().getResult().equals(event.getCurrentItem())
+                || !event.getInventory().getRecipe().getResult().equals(event.getCurrentItem())) {
+            return Optional.empty();
+        }
+        var matrix = event.getInventory().getMatrix();
+        if (matrix.length != 4 && matrix.length != 9) return Optional.empty();
+        var required = EnumSet.of(Material.STICK, Material.PAPER, Material.FEATHER, Material.INK_SAC);
+        int limit = Integer.MAX_VALUE;
+        for (var item : matrix) {
+            if (empty(item)) continue;
+            if (!required.remove(item.getType()) || item.getAmount() > item.getMaxStackSize()) return Optional.empty();
+            limit = Math.min(limit, item.getAmount());
+        }
+        if (!required.isEmpty()) return Optional.empty();
+        if (event.getAction() == InventoryAction.MOVE_TO_OTHER_INVENTORY && event.isShiftClick()) {
+            var slots = new ArrayList<Integer>();
+            // Vanilla reverse result transfer: hotbar 8..0, then main storage 35..9.
+            for (int slot = 8; slot >= 0 && slots.size() < limit; slot--) {
+                if (empty(event.getView().getBottomInventory().getItem(slot))) slots.add(slot);
+            }
+            for (int slot = 35; slot >= 9 && slots.size() < limit; slot--) {
+                if (empty(event.getView().getBottomInventory().getItem(slot))) slots.add(slot);
+            }
+            if (slots.isEmpty()) return Optional.empty();
+            return Optional.of(new ManualCraftPlan(event, matrix, slots.size(), Route.INVENTORY, slots));
+        }
+        if (event.getAction() == InventoryAction.HOTBAR_SWAP) {
+            int slot;
+            if (event.getClick() == ClickType.SWAP_OFFHAND) slot = 40;
+            else if (event.getClick() == ClickType.NUMBER_KEY && event.getHotbarButton() >= 0
+                    && event.getHotbarButton() <= 8) slot = event.getHotbarButton();
+            else return Optional.empty();
+            if (!empty(event.getView().getBottomInventory().getItem(slot))) return Optional.empty();
+            return Optional.of(new ManualCraftPlan(event, matrix, 1, Route.INVENTORY, List.of(slot)));
+        }
+        boolean singleDrop = event.getClick() == ClickType.DROP && event.getAction() == InventoryAction.DROP_ONE_SLOT;
+        boolean bulkDrop = event.getClick() == ClickType.CONTROL_DROP && event.getAction() == InventoryAction.DROP_ALL_SLOT;
+        if ((singleDrop || bulkDrop) && empty(event.getCursor())) {
+            return Optional.of(new ManualCraftPlan(event, matrix, bulkDrop ? limit : 1, Route.DROP, List.of()));
+        }
+        boolean cursorClick = event.getClick() == ClickType.LEFT && event.getAction() == InventoryAction.PICKUP_ALL
+            || event.getClick() == ClickType.RIGHT && event.getAction() == InventoryAction.PICKUP_HALF;
+        if (!cursorClick || !empty(event.getCursor())) return Optional.empty();
+        return Optional.of(new ManualCraftPlan(event, matrix, 1, Route.CURSOR, List.of()));
+    }
+
+    /**
+     * Content check only, not a commit or session authorization. The caller must also invalidate
+     * tokens on close/reopen, disconnect and disable, including reuse of the same native menu.
+     * Never call this from a worker or use an old view to write a new menu's cursor.
+     */
+    public boolean matches(InventoryView current) {
+        return matches(current, matrix);
+    }
+
+    private boolean matches(InventoryView current, ItemStack[] expected) {
+        if (current != view || current.getTopInventory() != grid || current.getBottomInventory() != inventory) return false;
+        var recipe = grid.getRecipe();
+        return isSheetRecipe(recipe) && Objects.equals(result, recipe.getResult())
+            && Arrays.equals(expected, copy(grid.getMatrix())) && Objects.equals(result, copy(grid.getResult()))
+            && Objects.equals(cursor, copy(current.getCursor()))
+            && inventorySlots.stream().allMatch(slot -> empty(inventory.getItem(slot)));
+    }
+
+    /** Revalidate the original drop intent after exactly this many completed units, not a new snapshot. */
+    public boolean matchesAfterDrops(InventoryView current, int completed) {
+        return route == Route.DROP && completed >= 0 && completed < quantity
+            && matches(current, remainingMatrix(completed));
+    }
+
+    public int quantity() { return quantity; }
+    public Route route() { return route; }
+    public List<Integer> inventorySlots() { return inventorySlots; }
+
+    public ItemStack[] remainingMatrix() {
+        return remainingMatrix(quantity);
+    }
+
+    private ItemStack[] remainingMatrix(int consumed) {
+        var remaining = copy(matrix);
+        for (int slot = 0; slot < remaining.length; slot++) {
+            var item = remaining[slot];
+            if (item != null) {
+                if (item.getAmount() == consumed) remaining[slot] = null;
+                else item.setAmount(item.getAmount() - consumed);
+            }
+        }
+        return remaining;
+    }
+
+    private static boolean isSheetRecipe(Recipe recipe) {
+        return recipe instanceof Keyed keyed && CharacterSheets.RECIPE.equals(keyed.getKey());
+    }
+
+    private static boolean empty(ItemStack item) { return item == null || item.isEmpty(); }
+    private static ItemStack copy(ItemStack item) { return empty(item) ? null : item.clone(); }
+
+    private static ItemStack[] copy(ItemStack[] items) {
+        var result = new ItemStack[items.length];
+        for (int slot = 0; slot < items.length; slot++) {
+            result[slot] = copy(items[slot]);
+        }
+        return result;
+    }
+}

src/main/java/games/dmg/fantasystick/crafting/ManualCraftingController.java

@@ -0,0 +1,175 @@
+package games.dmg.fantasystick.crafting;
+
+import games.dmg.fantasystick.items.CharacterSheets;
+import games.dmg.fantasystick.persistence.CharacterRecord;
+import org.bukkit.Keyed;
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import java.util.List;
+import java.util.UUID;
+import java.util.function.Consumer;
+import java.util.function.Function;
+import java.util.function.Supplier;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.inventory.CraftItemEvent;
+
+/**
+ * Owns accepted manual craft lifetimes. Native entrypoints/close run on the server thread.
+ * nextTick must always enqueue onto that thread (never run inline), or throw on rejection.
+ * Diagnostics must be thread-safe, nonthrowing and independent of native player access.
+ * A cancellation observed before this HIGHEST handler is preserved; the event's single boolean cannot
+ * distinguish our containment cancellation from an independent later plugin veto.
+ */
+public final class ManualCraftingController implements Listener, AutoCloseable {
+    public record Failure(UUID player, List<UUID> characters, String operation, Throwable cause) {
+        public Failure { characters = List.copyOf(characters); }
+    }
+
+    private final CharacterStorage storage;
+    private final Supplier<CharacterRecord> allocate;
+    private final Consumer<Runnable> nextTick;
+    private final Function<Player, ManualDropDelivery.DropTarget> drops;
+    private final Consumer<Failure> failures;
+    private final java.util.concurrent.ConcurrentMap<UUID, Attempt> pending = new java.util.concurrent.ConcurrentHashMap<>();
+    private volatile boolean closed;
+    // Server-thread reservation outlives close/reopen invalidation and includes client-sync callbacks.
+    private final java.util.Set<UUID> delivering = new java.util.HashSet<>();
+
+    public ManualCraftingController(CharacterStorage storage, Supplier<CharacterRecord> allocate,
+            Consumer<Runnable> nextTick, Function<Player, ManualDropDelivery.DropTarget> drops, Consumer<Failure> failures) {
+        this.storage = java.util.Objects.requireNonNull(storage);
+        this.allocate = java.util.Objects.requireNonNull(allocate);
+        this.nextTick = java.util.Objects.requireNonNull(nextTick);
+        this.drops = java.util.Objects.requireNonNull(drops);
+        this.failures = java.util.Objects.requireNonNull(failures);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void onCraft(CraftItemEvent event) {
+        if (event.isCancelled() || !(event.getRecipe() instanceof Keyed keyed)
+                || !CharacterSheets.RECIPE.equals(keyed.getKey())) return;
+        java.util.Optional<ManualCraftPlan> plan;
+        try {
+            plan = ManualCraftPlan.capture(event);
+        } catch (RuntimeException failure) {
+            failures.accept(new Failure(event.getWhoClicked().getUniqueId(), List.of(), "plan", failure));
+            return;
+        } finally {
+            // capture must see the original cancellation state, but exceptions must never expose the plain preview.
+            event.setCancelled(true);
+        }
+        if (closed || plan.isEmpty() || !(event.getWhoClicked() instanceof Player player) || !player.isOnline()
+                || !plan.orElseThrow().matches(player.getOpenInventory())) return;
+        var attempt = new Attempt(player.getUniqueId(), player, plan.orElseThrow());
+        if (delivering.contains(attempt.id) || pending.putIfAbsent(attempt.id, attempt) != null) return;
+        try {
+            var records = java.util.stream.IntStream.range(0, attempt.plan.quantity()).mapToObj(index -> allocate.get()).toList();
+            attempt.characters = records.stream().map(CharacterRecord::id).toList();
+            attempt.preparation = storage.prepareCraft(records);
+            attempt.preparation.ready().whenComplete((batch, failure) -> schedule(attempt, batch, failure));
+        } catch (RuntimeException failure) {
+            pending.remove(attempt.id, attempt);
+            abandon(attempt);
+            failures.accept(new Failure(attempt.id, attempt.characters, "prepare", failure));
+        }
+    }
+
+    private void schedule(Attempt attempt, CharacterStorage.CraftBatch batch, Throwable failure) {
+        if (closed || pending.get(attempt.id) != attempt) {
+            abandon(attempt);
+            return;
+        }
+        try {
+            nextTick.accept(() -> complete(attempt, batch, failure));
+        } catch (RuntimeException rejected) {
+            pending.remove(attempt.id, attempt);
+            abandon(attempt);
+            // This branch may run on the persistence worker: diagnostics use captured IDs, never native player access.
+            failures.accept(new Failure(attempt.id, attempt.characters, "schedule", rejected));
+        }
+    }
+
+    private void complete(Attempt attempt, CharacterStorage.CraftBatch batch, Throwable failure) {
+        if (closed || pending.get(attempt.id) != attempt) {
+            abandon(attempt);
+            return;
+        }
+        if (!delivering.add(attempt.id)) return;
+        try {
+            if (failure != null) failures.accept(new Failure(attempt.id, attempt.characters, "save", failure));
+            else if (attempt.player.isOnline()) {
+                attempt.handoffStarted = true;
+                if (attempt.plan.route() == ManualCraftPlan.Route.DROP) {
+                    var result = ManualDropDelivery.commit(attempt.plan, batch, attempt.player::getOpenInventory,
+                        () -> !closed && pending.get(attempt.id) == attempt && attempt.player.isOnline(), drops.apply(attempt.player));
+                    if (result.status() != ManualDropDelivery.Status.COMPLETE) {
+                        failures.accept(new Failure(attempt.id, attempt.characters, "drop-" + result.status().name().toLowerCase(java.util.Locale.ROOT), null));
+                    }
+                } else {
+                    var result = ManualCraftDelivery.commit(attempt.plan, batch, attempt.player.getOpenInventory());
+                    attempt.handoffStarted = result == ManualCraftDelivery.Result.DELIVERED;
+                }
+            }
+        } catch (RuntimeException unexpected) {
+            failures.accept(new Failure(attempt.id, attempt.characters, "delivery", unexpected));
+        } finally {
+            pending.remove(attempt.id, attempt);
+            abandon(attempt);
+            try {
+                if (attempt.player.isOnline()) attempt.player.updateInventory();
+            } catch (RuntimeException unexpected) {
+                failures.accept(new Failure(attempt.id, attempt.characters, "sync", unexpected));
+            } finally {
+                delivering.remove(attempt.id);
+            }
+        }
+    }
+
+    private static final class Attempt {
+        final UUID id;
+        final Player player;
+        final ManualCraftPlan plan;
+        List<UUID> characters = List.of();
+        CharacterStorage.CraftPreparation preparation;
+        volatile boolean handoffStarted;
+        final java.util.concurrent.atomic.AtomicBoolean cleanupObserved = new java.util.concurrent.atomic.AtomicBoolean();
+
+        Attempt(UUID id, Player player, ManualCraftPlan plan) {
+            this.id = id;
+            this.player = player;
+            this.plan = plan;
+        }
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void onClose(org.bukkit.event.inventory.InventoryCloseEvent event) { invalidate(event.getPlayer().getUniqueId()); }
+
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void onOpen(org.bukkit.event.inventory.InventoryOpenEvent event) {
+        if (!event.isCancelled()) invalidate(event.getPlayer().getUniqueId());
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void onQuit(org.bukkit.event.player.PlayerQuitEvent event) { invalidate(event.getPlayer().getUniqueId()); }
+
+    private void invalidate(UUID player) {
+        var attempt = pending.remove(player);
+        if (attempt != null) abandon(attempt);
+    }
+
+    private void abandon(Attempt attempt) {
+        if (attempt.preparation == null || !attempt.cleanupObserved.compareAndSet(false, true)) return;
+        attempt.preparation.abandon().thenAccept(cleanup -> {
+            if (!attempt.handoffStarted && !cleanup.retained().isEmpty()) {
+                failures.accept(new Failure(attempt.id, List.copyOf(cleanup.retained()), "cleanup-retained", null));
+            }
+        });
+    }
+
+    @Override public void close() {
+        closed = true;
+        for (var id : pending.keySet()) invalidate(id);
+    }
+}

src/main/java/games/dmg/fantasystick/crafting/ManualCraftingGuard.java

@@ -0,0 +1,15 @@
+package games.dmg.fantasystick.crafting;
+
+import games.dmg.fantasystick.items.CharacterSheets;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.block.CrafterCraftEvent;
+
+/** Register alongside the completed manual-crafting adapter, before exposing the recipe. */
+public final class ManualCraftingGuard implements Listener {
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void onAutomatedCraft(CrafterCraftEvent event) {
+        if (CharacterSheets.RECIPE.equals(event.getRecipe().getKey())) event.setCancelled(true);
+    }
+}

src/main/java/games/dmg/fantasystick/crafting/ManualDropDelivery.java

@@ -0,0 +1,57 @@
+package games.dmg.fantasystick.crafting;
+
+import games.dmg.fantasystick.items.CharacterSheets;
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import org.bukkit.inventory.CraftingInventory;
+import java.util.function.BooleanSupplier;
+import java.util.function.Supplier;
+import org.bukkit.inventory.InventoryView;
+import org.bukkit.inventory.ItemStack;
+
+/**
+ * Server-thread drop executor. The caller owns vanilla containment and a one-use lifecycle/attempt guard,
+ * including refusing NEW attempts during callbacks against these same still-undebited inputs.
+ * UNCONFIRMED means an output may have escaped without a safely authorized debit; stop/report, never replay.
+ * Public callbacks consume the batch's cleanup proof, including any unattempted suffix. This is not atomic
+ * with arbitrary plugin mutations, native insertion failures or Minecraft/file saves.
+ */
+public final class ManualDropDelivery {
+    public enum Status { COMPLETE, CANCELLED, STALE, UNCONFIRMED, UNAVAILABLE, UNSUPPORTED_ROUTE }
+    /** completed counts units with both confirmed insertion and ingredient debit, not every possibly issued sheet. */
+    public record Result(Status status, int completed) { }
+
+    @FunctionalInterface
+    public interface DropTarget {
+        /** COMPLETE means one matching sheet was inserted; callbacks must recheck context before insertion. */
+        Status drop(ItemStack sheet, BooleanSupplier current);
+    }
+
+    private ManualDropDelivery() { }
+
+    public static Result commit(ManualCraftPlan plan, CharacterStorage.CraftBatch batch,
+            Supplier<InventoryView> currentView, BooleanSupplier authorized, DropTarget target) {
+        if (plan.route() != ManualCraftPlan.Route.DROP) return new Result(Status.UNSUPPORTED_ROUTE, 0);
+        BooleanSupplier current = () -> authorized.getAsBoolean() && plan.matchesAfterDrops(currentView.get(), 0);
+        if (!current.getAsBoolean()) return new Result(Status.STALE, 0);
+        var records = batch.claimForDelivery(plan.quantity());
+        if (records.isEmpty()) return new Result(Status.UNAVAILABLE, 0);
+        var sheets = new CharacterSheets();
+        var outputs = records.orElseThrow().stream().map(sheets::create).toList();
+        for (int completed = 0; completed < outputs.size(); completed++) {
+            int expectedCompleted = completed;
+            BooleanSupplier next = () -> authorized.getAsBoolean()
+                && plan.matchesAfterDrops(currentView.get(), expectedCompleted);
+            if (!next.getAsBoolean()) return new Result(Status.STALE, completed);
+            var status = java.util.Objects.requireNonNull(target.drop(outputs.get(completed), next));
+            if (status != Status.COMPLETE) return new Result(status, completed);
+            // A spawn callback may close/replace the menu after an item has escaped. Never charge a stale snapshot.
+            if (!next.getAsBoolean()) return new Result(Status.UNCONFIRMED, completed);
+            var grid = (CraftingInventory) currentView.get().getTopInventory();
+            var inputs = grid.getMatrix();
+            for (var item : inputs) if (item != null && !item.isEmpty()) item.setAmount(item.getAmount() - 1);
+            grid.setItem(1, inputs[0]);
+            // Revalidate against the original plan's expected remaining matrix after this callback boundary.
+        }
+        return new Result(Status.COMPLETE, outputs.size());
+    }
+}

src/main/java/games/dmg/fantasystick/crafting/PlayerSheetDrops.java

@@ -0,0 +1,71 @@
+package games.dmg.fantasystick.crafting;
+
+import games.dmg.fantasystick.items.CharacterSheets;
+import java.util.concurrent.ThreadLocalRandom;
+import java.util.function.BooleanSupplier;
+import java.util.function.Consumer;
+import org.bukkit.entity.Item;
+import org.bukkit.entity.Player;
+import org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason;
+import org.bukkit.event.player.PlayerDropItemEvent;
+import org.bukkit.inventory.ItemStack;
+
+/**
+ * World boundary for saved sheets; no inventory-source drop or cancellation return-to-inventory fallback.
+ * Invoke on the server thread with an existing reference, or after the craft batch claim,
+ * since listeners receive a playable identity.
+ * Native spawnAt supplies ItemSpawnEvent; do not dispatch that event separately or infer success from a wrapper.
+ */
+public final class PlayerSheetDrops implements ManualDropDelivery.DropTarget {
+    private final Player player;
+    private final Consumer<PlayerDropItemEvent> events;
+
+    /** events must dispatch synchronously through the server's PluginManager.callEvent in the registered path. */
+    public PlayerSheetDrops(Player player, Consumer<PlayerDropItemEvent> events) {
+        this.player = java.util.Objects.requireNonNull(player);
+        this.events = java.util.Objects.requireNonNull(events);
+    }
+
+    @Override
+    public ManualDropDelivery.Status drop(ItemStack sheet, BooleanSupplier current) {
+        if (sheet == null || sheet.getAmount() != 1 || new CharacterSheets().identify(sheet).isEmpty()) {
+            throw new IllegalArgumentException("Exactly one identified character sheet is required");
+        }
+        return dropReferences(sheet, current);
+    }
+
+    /**
+     * Drop an existing stack of references to the same character, not a batch of newly crafted characters.
+     * COMPLETE confirms this quantity in one entity; the caller must recheck context before source debit.
+     * No character allocation, inventory-source fallback or retry of uncertain exposure is performed.
+     */
+    public ManualDropDelivery.Status dropReferences(ItemStack sheet, BooleanSupplier current) {
+        if (sheet == null || sheet.getAmount() <= 0 || sheet.getAmount() > sheet.getMaxStackSize()
+                || new CharacterSheets().identify(sheet).isEmpty()) {
+            throw new IllegalArgumentException("A positive, native-sized stack of identified character references is required");
+        }
+        if (!current.getAsBoolean()) return ManualDropDelivery.Status.STALE;
+        var location = player.getEyeLocation().subtract(0, .3, 0);
+        var item = location.getWorld().createEntity(location, Item.class);
+        item.setItemStack(sheet.clone());
+        item.setPickupDelay(40);
+        item.setThrower(player.getUniqueId());
+        var random = ThreadLocalRandom.current();
+        double angle = random.nextDouble() * Math.PI * 2;
+        double spread = random.nextDouble() * .02;
+        var velocity = location.getDirection().multiply(.3);
+        velocity.add(new org.bukkit.util.Vector(Math.cos(angle) * spread,
+            .1 + (random.nextDouble() - random.nextDouble()) * .1, Math.sin(angle) * spread));
+        item.setVelocity(velocity);
+        var event = new PlayerDropItemEvent(player, item);
+        events.accept(event);
+        if (item.isInWorld() || item.isValid() || item.isDead() || !sheet.equals(item.getItemStack())) {
+            return ManualDropDelivery.Status.UNCONFIRMED;
+        }
+        if (event.isCancelled()) return ManualDropDelivery.Status.CANCELLED;
+        if (!current.getAsBoolean()) return ManualDropDelivery.Status.STALE;
+        boolean inserted = item.spawnAt(item.getLocation(), SpawnReason.CUSTOM);
+        return inserted && item.isValid() && item.isInWorld() && sheet.equals(item.getItemStack())
+            ? ManualDropDelivery.Status.COMPLETE : ManualDropDelivery.Status.UNCONFIRMED;
+    }
+}

src/main/java/games/dmg/fantasystick/items/CharacterSheets.java

@@ -13,9 +13,11 @@ import org.bukkit.persistence.PersistentDataType;
 
 /** Sheet presentation/identity only; saved records and session eligibility remain authoritative. */
 public final class CharacterSheets {
+    public static final NamespacedKey RECIPE = new NamespacedKey("fantasystick", "character_sheet");
     private static final NamespacedKey VERSION = new NamespacedKey("fantasystick", "sheet_version");
     private static final NamespacedKey CHARACTER = new NamespacedKey("fantasystick", "character_id");
-    private static final String INSTRUCTION = "Character sheet: place in off hand to enter fantasy world.";
+    private static final List<Component> INSTRUCTION = List.of(Component.text("Character sheet:"),
+        Component.text("Place in off hand"), Component.text("to enter fantasy world."));
 
     public ItemStack create(CharacterRecord character) {
         if (character.dead()) throw new IllegalArgumentException("Dead characters require authoritative revival before sheet creation");
@@ -30,7 +32,7 @@ public final class CharacterSheets {
 
     /** Definition only: a future craft-completion adapter must persist and mint each actual result. */
     public ShapelessRecipe recipe() {
-        return new ShapelessRecipe(new NamespacedKey("fantasystick", "character_sheet"), paper("Character sheet"))
+        return new ShapelessRecipe(RECIPE, paper("Character sheet"))
             .addIngredient(Material.STICK).addIngredient(Material.PAPER)
             .addIngredient(Material.FEATHER).addIngredient(Material.INK_SAC);
     }
@@ -39,7 +41,7 @@ public final class CharacterSheets {
         var item = new ItemStack(Material.PAPER);
         var meta = item.getItemMeta();
         meta.displayName(Component.text(name));
-        meta.lore(List.of(Component.text(INSTRUCTION)));
+        meta.lore(INSTRUCTION);
         item.setItemMeta(meta);
         return item;
     }

src/main/java/games/dmg/fantasystick/items/EquipmentStorage.java

@@ -22,21 +22,39 @@ public final class EquipmentStorage {
     private static final NamespacedKey SESSION = key("storage_session_id");
     private static final NamespacedKey SLOTS = key("storage_slots");
 
+    private record PackPlan(PackResult result, ItemStack box, int destination) { }
+
+    /** Full read-only preflight; no contents are removed and no box is installed. */
+    public java.util.Optional<PackResult> refusal(PlayerInventory inventory, UUID owner, UUID session) {
+        var plan = inspect(inventory, owner, session);
+        return plan.result() == PackResult.PACKED ? java.util.Optional.empty() : java.util.Optional.of(plan.result());
+    }
+
     public PackResult pack(PlayerInventory inventory, UUID owner, UUID session) {
+        var plan = inspect(inventory, owner, session);
+        if (plan.result() != PackResult.PACKED) return plan.result();
+        // Install the genuine, fully constructed recovery copy before removing any original.
+        // Setter exceptions may retain duplicates; the caller must report uncertainty, not roll back.
+        inventory.setItem(plan.destination(), plan.box());
+        for (int slot : EQUIPMENT_SLOTS) inventory.setItem(slot, null);
+        return PackResult.PACKED;
+    }
+
+    private PackPlan inspect(PlayerInventory inventory, UUID owner, UUID session) {
         Objects.requireNonNull(owner);
         Objects.requireNonNull(session);
         for (int slot = 9; slot < 36; slot++) {
-            if (matches(inventory.getItem(slot), owner, session)) return PackResult.ALREADY_PACKED;
+            if (matches(inventory.getItem(slot), owner, session)) return new PackPlan(PackResult.ALREADY_PACKED, null, -1);
         }
         for (int slot : EQUIPMENT_SLOTS) {
             var item = inventory.getItem(slot);
-            if (!empty(item) && item.getType().name().endsWith("SHULKER_BOX")) return PackResult.INELIGIBLE_EQUIPMENT;
+            if (!empty(item) && item.getType().name().endsWith("SHULKER_BOX")) return new PackPlan(PackResult.INELIGIBLE_EQUIPMENT, null, -1);
         }
         int available = -1;
         for (int slot = 9; slot < 36; slot++) {
             if (empty(inventory.getItem(slot))) { available = slot; break; }
         }
-        if (available == -1) return PackResult.NO_SPACE;
+        if (available == -1) return new PackPlan(PackResult.NO_SPACE, null, -1);
         var item = new ItemStack(Material.SHULKER_BOX);
         var meta = (BlockStateMeta) item.getItemMeta();
         var box = (ShulkerBox) meta.getBlockState();
@@ -44,7 +62,7 @@ public final class EquipmentStorage {
         for (int i = 0; i < EQUIPMENT_SLOTS.length; i++) {
             var equipment = inventory.getItem(EQUIPMENT_SLOTS[i]);
             if (!empty(equipment) && equipment.getAmount() > Math.min(equipment.getMaxStackSize(), contents.getMaxStackSize())) {
-                return PackResult.INELIGIBLE_EQUIPMENT;
+                return new PackPlan(PackResult.INELIGIBLE_EQUIPMENT, null, -1);
             }
             contents.setItem(i, equipment);
         }
@@ -56,26 +74,48 @@ public final class EquipmentStorage {
         data.set(SESSION, PersistentDataType.STRING, session.toString());
         data.set(SLOTS, PersistentDataType.INTEGER_ARRAY, EQUIPMENT_SLOTS.clone());
         item.setItemMeta(meta);
-        for (int slot : EQUIPMENT_SLOTS) inventory.setItem(slot, null);
-        inventory.setItem(available, item);
-        return PackResult.PACKED;
+        return new PackPlan(PackResult.PACKED, item, available);
     }
 
     public enum RestoreResult { RESTORED, NOT_FOUND, AMBIGUOUS, INVALID_BOX, OCCUPIED_SLOT }
 
     /** Caller removes validated fantasy controls first. Unexpected slot occupants are never overwritten. */
     public RestoreResult restore(PlayerInventory inventory, UUID owner, UUID session) {
+        return restore(inventory, owner, session, item -> false);
+    }
+
+    /** Validates the entire restore before replacing only the current session's owned hotbar controls. */
+    public RestoreResult restore(PlayerInventory inventory, UUID owner, UUID session,
+                                 java.util.function.Predicate<ItemStack> ownedControl) {
+        return restore(inventory, owner, session, ownedControl, null, ignored -> { });
+    }
+
+    /** Cursor-aware restore; the setter is invoked only when the matching box is on the cursor. */
+    public RestoreResult restore(PlayerInventory inventory, UUID owner, UUID session,
+                                 ItemStack cursor, java.util.function.Consumer<ItemStack> setCursor) {
+        return restore(inventory, owner, session, item -> false, cursor, setCursor);
+    }
+
+    /** All candidates and destinations are validated before any write; setter failures are uncertain. */
+    public RestoreResult restore(PlayerInventory inventory, UUID owner, UUID session,
+                                 java.util.function.Predicate<ItemStack> ownedControl,
+                                 ItemStack cursor, java.util.function.Consumer<ItemStack> setCursor) {
+        Objects.requireNonNull(inventory);
+        Objects.requireNonNull(ownedControl);
+        Objects.requireNonNull(setCursor);
         Objects.requireNonNull(owner);
         Objects.requireNonNull(session);
         int found = -1;
-        for (int slot = 9; slot < 36; slot++) {
-            if (matches(inventory.getItem(slot), owner, session)) {
+        // 9..35 main, 40 offhand, 41 cursor (not an inventory index).
+        for (int slot = 9; slot <= 41; slot++) {
+            if (slot >= 36 && slot < 40) continue;
+            if (matches(slot == 41 ? cursor : inventory.getItem(slot), owner, session)) {
                 if (found != -1) return RestoreResult.AMBIGUOUS;
                 found = slot;
             }
         }
         if (found == -1) return RestoreResult.NOT_FOUND;
-        var item = inventory.getItem(found);
+        var item = found == 41 ? cursor : inventory.getItem(found);
         if (item.getAmount() != 1 || !(item.getItemMeta() instanceof BlockStateMeta meta)
                 || !(meta.getBlockState() instanceof ShulkerBox box)) return RestoreResult.INVALID_BOX;
         var data = meta.getPersistentDataContainer();
@@ -89,12 +129,15 @@ public final class EquipmentStorage {
             if (!empty(contents.getItem(slot))) return RestoreResult.INVALID_BOX;
         }
         for (int slot : EQUIPMENT_SLOTS) {
-            if (slot != 39 && !empty(inventory.getItem(slot))) return RestoreResult.OCCUPIED_SLOT;
+            if (slot == 39) continue;
+            var current = inventory.getItem(slot);
+            if (!empty(current) && !(slot < 9 && ownedControl.test(current.clone()))) return RestoreResult.OCCUPIED_SLOT;
         }
         var currentHead = inventory.getItem(39);
         var displacedHead = empty(currentHead) ? null : currentHead.clone();
         for (int i = 0; i < EQUIPMENT_SLOTS.length; i++) inventory.setItem(EQUIPMENT_SLOTS[i], contents.getItem(i));
-        inventory.setItem(found, displacedHead);
+        if (found == 41) setCursor.accept(displacedHead);
+        else inventory.setItem(found, displacedHead);
         return RestoreResult.RESTORED;
     }
 

src/main/java/games/dmg/fantasystick/items/SessionControls.java

@@ -0,0 +1,155 @@
+package games.dmg.fantasystick.items;
+
+import games.dmg.fantasystick.persistence.CharacterRecord;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.UUID;
+import net.kyori.adventure.text.Component;
+import org.bukkit.Material;
+import org.bukkit.NamespacedKey;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.persistence.PersistentDataContainer;
+import org.bukkit.persistence.PersistentDataType;
+
+/**
+ * Detached, server-thread control presentation/identity, never session or casting authorization.
+ * The caller must enforce session custody and suppress vanilla item uses; this class registers no events.
+ */
+public final class SessionControls {
+    private final games.dmg.fantasystick.ability.AbilityRegistry registry;
+    private static final NamespacedKey VERSION = key("control_version");
+    private static final NamespacedKey OWNER = key("control_owner_id");
+    private static final NamespacedKey SESSION = key("control_session_id");
+    private static final NamespacedKey SLOT = key("control_slot");
+    private static final NamespacedKey KIND = key("control_kind");
+    private static final NamespacedKey ABILITY = key("control_ability_id");
+
+    /** Presentation catalogue only: no unlock requirements, effects or casting authorization. */
+    private record Icon(Material material, String name) { }
+    private static final Map<String, Icon> ABILITIES = Map.ofEntries(
+        Map.entry("fireball", new Icon(Material.SNOWBALL, "Fireball")),
+        Map.entry("great_sword", new Icon(Material.WOODEN_SWORD, "Great Sword")),
+        Map.entry("frost_shard", new Icon(Material.PRISMARINE_SHARD, "Frost Shard")),
+        Map.entry("longbow", new Icon(Material.BOW, "Longbow")),
+        Map.entry("quickstep", new Icon(Material.RABBIT_FOOT, "Quickstep")),
+        Map.entry("second_wind", new Icon(Material.GHAST_TEAR, "Second Wind")),
+        Map.entry("stone_skin", new Icon(Material.BRICK, "Stone Skin")),
+        Map.entry("shield_bash", new Icon(Material.SHIELD, "Shield Bash")),
+        Map.entry("hex", new Icon(Material.SPIDER_EYE, "Hex")),
+        Map.entry("inspire", new Icon(Material.AMETHYST_SHARD, "Inspire")),
+        Map.entry("mending_light", new Icon(Material.GHAST_TEAR, "Mending Light")),
+        Map.entry("purify", new Icon(Material.HONEY_BOTTLE, "Purify")),
+        Map.entry("guardian_bond", new Icon(Material.IRON_CHESTPLATE, "Guardian Bond")),
+        Map.entry("rallying_cry", new Icon(Material.GOAT_HORN, "Rallying Cry")),
+        Map.entry("frost_nova", new Icon(Material.SNOWBALL, "Frost Nova")),
+        Map.entry("chain_lightning", new Icon(Material.LIGHTNING_ROD, "Chain Lightning")),
+        Map.entry("sanctuary", new Icon(Material.SEA_LANTERN, "Sanctuary")),
+        Map.entry("war_banner", new Icon(Material.RED_BANNER, "War Banner")),
+        Map.entry("meteor", new Icon(Material.FIRE_CHARGE, "Meteor")),
+        Map.entry("revive", new Icon(Material.ECHO_SHARD, "Revive"))
+    );
+
+    public record Identity(UUID owner, UUID session, int slot) { }
+
+    public SessionControls() { this(new games.dmg.fantasystick.ability.AbilityRegistry()); }
+    public SessionControls(games.dmg.fantasystick.ability.AbilityRegistry registry) {
+        this.registry = Objects.requireNonNull(registry);
+    }
+
+    private Icon icon(String ability) {
+        var definition = registry.find(ability).orElse(null);
+        return definition == null ? ABILITIES.get(ability) : new Icon(definition.icon(), definition.name());
+    }
+
+    /**
+     * Builds the entire detached hotbar before a caller may start packing equipment.
+     * Slot zero is a plain book control, not the pending character-book UI.
+     */
+    public ItemStack[] create(CharacterRecord character, UUID owner, UUID session) {
+        Objects.requireNonNull(character);
+        Objects.requireNonNull(owner);
+        Objects.requireNonNull(session);
+        var items = new ItemStack[9];
+        for (int slot = 0; slot < items.length; slot++) {
+            String ability = slot < 2 ? "" : character.loadout().get(slot - 2);
+            Icon abilityIcon = ability.isEmpty() ? null : icon(ability);
+            Icon icon = slot == 0 ? new Icon(Material.BOOK, "Character book")
+                : slot == 1 ? new Icon(Material.STICK, "Basic attack")
+                : ability.isEmpty() ? new Icon(Material.GRAY_DYE, "No Ability")
+                : abilityIcon == null ? new Icon(Material.PAPER, "Unavailable ability: " + ability) : abilityIcon;
+            var item = new ItemStack(icon.material());
+            var meta = item.getItemMeta();
+            meta.displayName(Component.text(icon.name()));
+            meta.setMaxStackSize(1);
+            var data = meta.getPersistentDataContainer();
+            data.set(VERSION, PersistentDataType.INTEGER, 1);
+            data.set(OWNER, PersistentDataType.STRING, owner.toString());
+            data.set(SESSION, PersistentDataType.STRING, session.toString());
+            data.set(SLOT, PersistentDataType.INTEGER, slot);
+            data.set(KIND, PersistentDataType.STRING, slot == 0 ? "book" : slot == 1 ? "basic_attack"
+                : ability.isEmpty() ? "empty" : abilityIcon != null ? "ability" : "unavailable");
+            if (!ability.isEmpty()) data.set(ABILITY, PersistentDataType.STRING, ability);
+            item.setItemMeta(meta);
+            items[slot] = item;
+        }
+        return items;
+    }
+
+    /** Structural identity only, not proof of an active session or permission to cast. */
+    public Optional<Identity> identify(ItemStack item) {
+        if (item == null || item.getAmount() != 1 || !item.hasItemMeta()) return Optional.empty();
+        var meta = item.getItemMeta();
+        // The native codec can omit redundant overrides on naturally unstackable icons.
+        if (item.getMaxStackSize() != 1) return Optional.empty();
+        var data = meta.getPersistentDataContainer();
+        if (!data.has(VERSION, PersistentDataType.INTEGER)
+                || !Integer.valueOf(1).equals(data.get(VERSION, PersistentDataType.INTEGER))
+                || !data.has(OWNER, PersistentDataType.STRING)
+                || !data.has(SESSION, PersistentDataType.STRING)
+                || !data.has(SLOT, PersistentDataType.INTEGER)
+                || !data.has(KIND, PersistentDataType.STRING)) return Optional.empty();
+        int slot = data.get(SLOT, PersistentDataType.INTEGER);
+        if (slot < 0 || slot > 8 || !validKind(item.getType(), slot, data)) return Optional.empty();
+        try {
+            return Optional.of(new Identity(canonicalUuid(data.get(OWNER, PersistentDataType.STRING)),
+                canonicalUuid(data.get(SESSION, PersistentDataType.STRING)), slot));
+        } catch (IllegalArgumentException exception) {
+            return Optional.empty();
+        }
+    }
+
+    /** A structurally recognized selectable ability; still not session/cast authorization. */
+    public Optional<String> ability(ItemStack item) {
+        if (identify(item).isEmpty()) return Optional.empty();
+        var data = item.getPersistentDataContainer();
+        return "ability".equals(data.get(KIND, PersistentDataType.STRING))
+            ? Optional.of(data.get(ABILITY, PersistentDataType.STRING)) : Optional.empty();
+    }
+
+    private boolean validKind(Material material, int slot, PersistentDataContainer data) {
+        String kind = data.get(KIND, PersistentDataType.STRING);
+        if (slot == 0) return kind.equals("book") && material == Material.BOOK && !data.has(ABILITY);
+        if (slot == 1) return kind.equals("basic_attack") && material == Material.STICK && !data.has(ABILITY);
+        if (kind.equals("empty")) return material == Material.GRAY_DYE && !data.has(ABILITY);
+        if (!data.has(ABILITY, PersistentDataType.STRING)) return false;
+        String ability = data.get(ABILITY, PersistentDataType.STRING);
+        if (ability.isBlank()) return false;
+        Icon icon = icon(ability);
+        return kind.equals("ability") ? icon != null && icon.material() == material
+            : kind.equals("unavailable") && icon == null && material == Material.PAPER;
+    }
+
+    private static UUID canonicalUuid(String value) {
+        UUID parsed = UUID.fromString(value);
+        if (!parsed.toString().equals(value)) throw new IllegalArgumentException("Noncanonical UUID");
+        return parsed;
+    }
+
+    private static NamespacedKey key(String name) { return new NamespacedKey("fantasystick", name); }
+
+    public boolean owned(ItemStack item, UUID owner, UUID session) {
+        return identify(item).filter(identity -> identity.owner().equals(owner)
+            && identity.session().equals(session)).isPresent();
+    }
+}

src/main/java/games/dmg/fantasystick/items/TailBooks.java

@@ -1,5 +1,6 @@
 package games.dmg.fantasystick.items;
 
+import games.dmg.fantasystick.book.BookPagination;
 import games.dmg.fantasystick.persistence.CharacterRecord;
 import games.dmg.fantasystick.progression.Stat;
 import java.util.ArrayList;
@@ -35,14 +36,26 @@ public final class TailBooks {
         meta.setGeneration(BookMeta.Generation.ORIGINAL);
         meta.displayName(Component.text(fullTitle));
         List<Component> pages = new ArrayList<>();
-        pages.add(Component.text(fullTitle));
-        pages.add(Component.text("Level: " + character.level()));
-        pages.add(Component.text("XP: " + character.experience()));
-        pages.add(Component.text("Unspent points: " + character.unspentPoints()));
-        for (Stat stat : Stat.values()) pages.add(Component.text(stat + ": " + character.stats().get(stat)));
-        pages.add(Component.text("Abilities: " + (character.learned().isEmpty() ? "None" : "")));
-        character.learned().stream().sorted().forEach(ability -> pages.add(Component.text(ability)));
-        pages.add(Component.text("Fell: " + character.diedAt()));
+        var summary = new StringBuilder(fullTitle).append("\nLevel: ").append(character.level())
+            .append("\nXP: ").append(character.experience()).append("\nUnspent points: ").append(character.unspentPoints());
+        for (Stat stat : Stat.values()) summary.append('\n').append(stat).append(": ").append(character.stats().get(stat));
+        pages.addAll(BookPagination.pages(summary.toString()));
+        if (character.learned().isEmpty()) pages.addAll(BookPagination.pages("Abilities: None"));
+        character.learned().stream().sorted().forEach(ability -> {
+            var slots = new ArrayList<String>();
+            for (int slot = 0; slot < character.loadout().size(); slot++) {
+                if (character.loadout().get(slot).equals(ability)) slots.add(Integer.toString(slot + 1));
+            }
+            var section = new StringBuilder("Ability: ").append(ability)
+                .append("\nSlots: ").append(slots.isEmpty() ? "none" : String.join(", ", slots));
+            var deadline = character.cooldowns().get(ability);
+            section.append(deadline == null ? "\nCooldown: none" : "\nCooldown until:\n" + deadline);
+            pages.addAll(BookPagination.pages(section.toString()));
+        });
+        // Unlearned/unknown saved cooldowns remain readable without pretending they are learned abilities.
+        character.cooldowns().keySet().stream().filter(id -> !character.learned().contains(id)).sorted().forEach(id ->
+            pages.addAll(BookPagination.pages("Saved cooldown\n" + id + "\nUntil:\n" + character.cooldowns().get(id))));
+        pages.addAll(BookPagination.pages("Fell:\n" + character.diedAt()));
         meta.pages(pages);
         var data = meta.getPersistentDataContainer();
         data.set(VERSION, PersistentDataType.INTEGER, 1);

src/main/java/games/dmg/fantasystick/party/CombatExperience.java

@@ -0,0 +1,253 @@
+package games.dmg.fantasystick.party;
+
+import games.dmg.fantasystick.persistence.CharacterRecord;
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import games.dmg.fantasystick.progression.CombatContributions;
+import games.dmg.fantasystick.progression.CombatRewardRules;
+import games.dmg.fantasystick.progression.ProgressionRules;
+import games.dmg.fantasystick.session.EquipmentSessions;
+import games.dmg.fantasystick.session.SessionVisuals;
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.time.Clock;
+import java.time.Instant;
+import java.util.ArrayList;
+import java.util.IdentityHashMap;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.function.Consumer;
+import java.util.function.Function;
+import org.bukkit.Color;
+import org.bukkit.Location;
+import org.bukkit.Sound;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.EntityType;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.entity.EntityDamageByEntityEvent;
+import org.bukkit.event.entity.EntityDamageEvent;
+import org.bukkit.event.entity.EntityDeathEvent;
+import org.bukkit.event.entity.EntityRemoveEvent;
+import org.bukkit.event.entity.PlayerDeathEvent;
+
+/** Accepted native contribution capture and durable character-bound XP delivery. */
+public final class CombatExperience implements Listener, AutoCloseable {
+    public record Failure(UUID character, Throwable cause) { }
+    private record Defeat(EquipmentSessions.Active active, int level) { }
+    private static final Set<EntityType> PASSIVE = Set.of(
+        EntityType.ALLAY, EntityType.ARMADILLO, EntityType.AXOLOTL, EntityType.BAT, EntityType.CAMEL,
+        EntityType.CAT, EntityType.CHICKEN, EntityType.COD, EntityType.COPPER_GOLEM, EntityType.COW,
+        EntityType.DONKEY, EntityType.FOX, EntityType.FROG, EntityType.GLOW_SQUID, EntityType.HAPPY_GHAST,
+        EntityType.HORSE, EntityType.MOOSHROOM, EntityType.MULE, EntityType.NAUTILUS, EntityType.OCELOT,
+        EntityType.PARROT, EntityType.PIG, EntityType.RABBIT, EntityType.SALMON, EntityType.SHEEP,
+        EntityType.SKELETON_HORSE, EntityType.SNIFFER, EntityType.SNOW_GOLEM, EntityType.SQUID,
+        EntityType.STRIDER, EntityType.TADPOLE, EntityType.TROPICAL_FISH, EntityType.TURTLE,
+        EntityType.VILLAGER, EntityType.WANDERING_TRADER, EntityType.ZOMBIE_HORSE);
+
+    private final CharacterStorage characters;
+    private final ProgressionRules progression;
+    private final CombatRewardRules rewards;
+    private final EquipmentSessions sessions;
+    private final Clock clock;
+    private final Consumer<Runnable> nextTick;
+    private final Function<UUID, Player> players;
+    private final Consumer<Failure> failures;
+    private final CombatSources sources;
+    private final CombatContributions contributions;
+    private final Map<PlayerDeathEvent, Defeat> defeats = new IdentityHashMap<>();
+    private final Map<UUID, PendingAward> pending = new ConcurrentHashMap<>();
+    private final java.util.concurrent.ConcurrentLinkedQueue<UUID> retries = new java.util.concurrent.ConcurrentLinkedQueue<>();
+    private org.bukkit.scheduler.BukkitTask retryTask;
+    private boolean closed;
+
+    private final class PendingAward {
+        final UUID id = UUID.randomUUID();
+        final UUID character;
+        final BigInteger reward;
+        final CombatRewardRules.KillPosition restricted;
+        BigInteger expectedRevision;
+        boolean running;
+        PendingAward(UUID character, BigInteger reward, CombatRewardRules.KillPosition restricted) {
+            this.character = character; this.reward = reward; this.restricted = restricted;
+        }
+    }
+
+    public CombatExperience(CharacterStorage characters, ProgressionRules progression, CombatRewardRules rewards,
+                            EquipmentSessions sessions, Clock clock, Consumer<Runnable> nextTick,
+                            Function<UUID, Player> players, Consumer<Failure> failures) {
+        this.characters = Objects.requireNonNull(characters); this.progression = Objects.requireNonNull(progression);
+        this.rewards = Objects.requireNonNull(rewards); this.sessions = Objects.requireNonNull(sessions);
+        this.clock = Objects.requireNonNull(clock); this.nextTick = Objects.requireNonNull(nextTick);
+        this.players = Objects.requireNonNull(players); this.failures = Objects.requireNonNull(failures);
+        sources = new CombatSources(sessions); contributions = new CombatContributions(rewards);
+    }
+
+    public void install(org.bukkit.plugin.Plugin plugin) {
+        if (closed || retryTask != null) throw new IllegalStateException("Combat experience is already installed or closed");
+        retryTask = plugin.getServer().getScheduler().runTaskTimer(plugin, this::retryPending, 20, 20);
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void damage(EntityDamageEvent event) {
+        if (closed || event.getFinalDamage() <= 0) return;
+        var origin = source(event);
+        if (origin == null || origin.session() == null || !sources.current(origin)
+                || event.getEntity().getUniqueId().equals(origin.player())) return;
+        contributions.accept(event.getEntity().getUniqueId(), origin.character(), clock.instant());
+    }
+
+    private CombatSources.Origin source(EntityDamageEvent event) {
+        if (event.getEntity() instanceof Player target) {
+            var ongoing = OngoingDamage.read(target, event.getCause());
+            if (ongoing != null) return ongoing.source();
+        }
+        var origin = sources.read(event.getDamageSource().getDirectEntity());
+        if (origin == null && event instanceof EntityDamageByEntityEvent byEntity) origin = sources.read(byEntity.getDamager());
+        if (origin == null) origin = sources.read(event.getDamageSource().getCausingEntity());
+        return origin;
+    }
+
+    @EventHandler(priority = EventPriority.LOWEST, ignoreCancelled = true)
+    public void beforePlayerDeath(PlayerDeathEvent event) {
+        if (closed) return;
+        var active = sessions.active(event.getEntity().getUniqueId()).orElse(null);
+        var record = active == null ? null : sessions.currentRecord(active).orElse(null);
+        if (record != null) defeats.put(event, new Defeat(active, record.level()));
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void playerDeath(PlayerDeathEvent event) {
+        var defeat = defeats.remove(event);
+        if (closed || defeat == null || !event.isCancelled() || sessions.current(defeat.active())) return;
+        award(event.getEntity(), CombatRewardRules.Target.FANTASY_CHARACTER, defeat.level(), defeat.active().character());
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void mobDeath(EntityDeathEvent event) {
+        if (closed || event instanceof PlayerDeathEvent) return;
+        award(event.getEntity(), classify(event.getEntity()), 0, null);
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void removed(EntityRemoveEvent event) {
+        if (!closed && event.getCause() != EntityRemoveEvent.Cause.DEATH) {
+            contributions.invalidate(event.getEntity().getUniqueId());
+        }
+    }
+
+    private void award(LivingEntity target, CombatRewardRules.Target kind, int level, UUID defeatedCharacter) {
+        Instant now = clock.instant();
+        var contributors = new ArrayList<>(contributions.consume(target.getUniqueId(), now));
+        if (defeatedCharacter != null) contributors.remove(defeatedCharacter);
+        if (contributors.isEmpty()) return;
+        BigInteger share = rewards.share(rewards.pool(kind, level), contributors.size());
+        CombatRewardRules.KillPosition restricted = kind == CombatRewardRules.Target.PASSIVE
+            || kind == CombatRewardRules.Target.FANTASY_CHARACTER ? null : position(target.getLocation());
+        for (UUID character : contributors) {
+            var operation = new PendingAward(character, share, restricted);
+            pending.put(operation.id, operation);
+            attempt(operation);
+        }
+    }
+
+    private static CombatRewardRules.KillPosition position(Location location) {
+        var world = Objects.requireNonNull(location.getWorld(), "Kill location has no world").getUID();
+        return new CombatRewardRules.KillPosition(Objects.requireNonNull(world, "Kill world has no UUID"),
+            BigDecimal.valueOf(location.getX()), BigDecimal.valueOf(location.getY()), BigDecimal.valueOf(location.getZ()));
+    }
+
+    private void attempt(PendingAward operation) {
+        synchronized (operation) {
+            if (closed || operation.running || !pending.containsKey(operation.id)) return;
+            operation.running = true;
+        }
+        if (operation.expectedRevision == null) {
+            characters.find(operation.character).whenComplete((record, failure) -> {
+                synchronized (operation) { operation.running = false; }
+                if (failure != null) { fail(operation, failure); return; }
+                if (record.isEmpty() || record.orElseThrow().dead()) { pending.remove(operation.id); return; }
+                operation.expectedRevision = record.orElseThrow().revision();
+                attempt(operation);
+            });
+            return;
+        }
+        characters.awardCombatExperience(operation.character, operation.expectedRevision, operation.reward,
+            progression, rewards, operation.restricted).whenComplete((award, failure) -> {
+                synchronized (operation) { operation.running = false; }
+                if (failure != null) { fail(operation, failure); return; }
+                if (award.status() == CharacterStorage.CombatAwardStatus.STALE && award.record().isPresent()) {
+                    operation.expectedRevision = award.record().orElseThrow().revision(); attempt(operation); return;
+                }
+                pending.remove(operation.id);
+                if (award.record().isEmpty() || award.status() == CharacterStorage.CombatAwardStatus.UNAVAILABLE) return;
+                try { nextTick.accept(() -> acknowledge(operation, award)); }
+                catch (RuntimeException rejected) { report(operation.character, rejected); }
+            });
+    }
+
+    private void fail(PendingAward operation, Throwable failure) {
+        report(operation.character, failure);
+        if (!closed && pending.containsKey(operation.id)) retries.offer(operation.id);
+    }
+
+    public void retryPending() {
+        if (closed) return;
+        for (int attempted = 0; attempted < 64; attempted++) {
+            UUID id = retries.poll();
+            if (id == null) break;
+            var operation = pending.get(id);
+            if (operation != null) attempt(operation);
+        }
+    }
+
+    private void acknowledge(PendingAward operation, CharacterStorage.CombatAward award) {
+        if (closed) return;
+        CharacterRecord saved = award.record().orElseThrow();
+        var active = sessions.activeCharacter(operation.character).orElse(null);
+        if (active != null && !sessions.acknowledgeProgress(active, saved.revision().subtract(BigInteger.ONE), saved)
+                && !sessions.currentRecord(active).filter(saved::equals).isPresent()) {
+            report(operation.character, new IllegalStateException("Saved combat progress could not synchronize with active session"));
+            return;
+        }
+        Player player = active == null ? null : players.apply(active.player());
+        if (player == null || !player.isOnline()) return;
+        if (award.status() == CharacterStorage.CombatAwardStatus.APPLIED) {
+            player.sendMessage("Earned " + operation.reward + " fantasy XP.");
+            for (int gained = 1; gained <= award.levels(); gained++) {
+                int level = saved.level() - award.levels() + gained;
+                player.sendMessage("Level " + level + "! Gained 1 character point.");
+                SessionVisuals.burst(player, Color.BLUE, 12);
+                player.playSound(player.getLocation(), Sound.ENTITY_PLAYER_LEVELUP, 1, 1);
+            }
+        } else if (award.status() == CharacterStorage.CombatAwardStatus.SPACING_BLOCKED) {
+            player.sendMessage("No fantasy XP: this restricted kill was too close to your previous one in this world.");
+        } else if (award.status() == CharacterStorage.CombatAwardStatus.AT_CAP) {
+            player.sendMessage("No fantasy XP: this character is already at the configured maximum level.");
+        } else if (award.status() == CharacterStorage.CombatAwardStatus.UNCHANGED) {
+            player.sendMessage("No fantasy XP: this target's configured reward is zero.");
+        }
+    }
+
+    static CombatRewardRules.Target classify(LivingEntity entity) {
+        EntityType type = entity.getType();
+        if (type == EntityType.WARDEN || type == EntityType.ENDER_DRAGON) return CombatRewardRules.Target.BOSS;
+        return PASSIVE.contains(type) ? CombatRewardRules.Target.PASSIVE : CombatRewardRules.Target.ORDINARY;
+    }
+
+    private void report(UUID character, Throwable failure) {
+        try { failures.accept(new Failure(character, failure)); }
+        catch (RuntimeException ignored) { /* Diagnostics never replay or acknowledge a reward. */ }
+    }
+
+    @Override public void close() {
+        closed = true;
+        if (retryTask != null) retryTask.cancel();
+        defeats.clear(); pending.clear(); retries.clear(); contributions.close();
+    }
+}

src/main/java/games/dmg/fantasystick/party/CombatSources.java

@@ -0,0 +1,66 @@
+package games.dmg.fantasystick.party;
+
+import games.dmg.fantasystick.session.EquipmentSessions;
+import java.util.Objects;
+import java.util.UUID;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.Player;
+import org.bukkit.entity.Projectile;
+import org.bukkit.persistence.PersistentDataType;
+
+/** Source identity travels with delayed native entities, never with a replacement sheet or shooter. */
+final class CombatSources {
+    static final NamespacedKey ORIGIN = new NamespacedKey("fantasystick", "combat_origin_v1");
+    record Origin(UUID player, UUID session, UUID character) {
+        String encode() { return player + "/" + (session == null ? "-/-" : session + "/" + character); }
+        static Origin decode(String value) {
+            if (value == null || value.length() > 110) return null;
+            var parts = value.split("/", -1);
+            if (parts.length != 3) return null;
+            try {
+                var origin = new Origin(UUID.fromString(parts[0]), parts[1].equals("-") ? null : UUID.fromString(parts[1]),
+                    parts[2].equals("-") ? null : UUID.fromString(parts[2]));
+                return (origin.session == null) == (origin.character == null) && value.equals(origin.encode()) ? origin : null;
+            } catch (IllegalArgumentException malformed) { return null; }
+        }
+    }
+    private final EquipmentSessions sessions;
+    CombatSources(EquipmentSessions sessions) { this.sessions = Objects.requireNonNull(sessions); }
+    Origin player(UUID player) {
+        return sessions.active(player).map(active -> new Origin(player, active.session(), active.character()))
+            .orElseGet(() -> new Origin(player, null, null));
+    }
+    boolean current(Origin origin) {
+        return origin.equals(player(origin.player())) && (origin.session() == null
+            || sessions.current(new EquipmentSessions.Active(origin.player(), origin.session(), origin.character())));
+    }
+    Origin read(Entity entity) { return read(entity, 0); }
+    private Origin read(Entity entity, int depth) {
+        if (entity == null || depth >= 8) return null;
+        if (entity instanceof Player player) return player(player.getUniqueId());
+        var saved = Origin.decode(entity.getPersistentDataContainer().get(ORIGIN, PersistentDataType.STRING));
+        if (saved != null) return saved;
+        if (entity instanceof org.bukkit.entity.Tameable pet && pet.getOwnerUniqueId() != null) {
+            return player(pet.getOwnerUniqueId()); // A pet's new attack, not its old taming session.
+        }
+        var owner = owner(entity, depth + 1);
+        // No launch proof (e.g. predating plugin startup): never assign a current fantasy session.
+        return owner == null ? null : new Origin(owner.player(), null, null);
+    }
+    private Origin owner(Entity entity, int depth) {
+        if (entity instanceof Projectile projectile && projectile.getShooter() instanceof Entity shooter) return read(shooter, depth);
+        if (entity instanceof org.bukkit.entity.Firework firework && firework.getSpawningEntity() != null) return player(firework.getSpawningEntity());
+        if (entity instanceof org.bukkit.entity.TNTPrimed tnt) return read(tnt.getSource(), depth);
+        if (entity instanceof org.bukkit.entity.EvokerFangs fangs) return read(fangs.getOwner(), depth);
+        if (entity instanceof org.bukkit.entity.AreaEffectCloud cloud && cloud.getSource() instanceof Entity source) return read(source, depth);
+        return null;
+    }
+    void launch(Entity entity) {
+        if (entity.getPersistentDataContainer().has(ORIGIN)) return;
+        store(entity, owner(entity, 0));
+    }
+    void store(Entity entity, Origin origin) {
+        if (origin != null) entity.getPersistentDataContainer().set(ORIGIN, PersistentDataType.STRING, origin.encode());
+    }
+}

src/main/java/games/dmg/fantasystick/party/OngoingDamage.java

@@ -0,0 +1,119 @@
+package games.dmg.fantasystick.party;
+
+import java.util.ArrayList;
+import java.util.List;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Player;
+import org.bukkit.event.entity.EntityDamageEvent.DamageCause;
+import org.bukkit.persistence.PersistentDataType;
+import org.bukkit.potion.PotionEffect;
+import org.bukkit.potion.PotionEffectType;
+
+/** Bounded provenance for native damage layers, not copied effects or character/XP state.
+ * Native effects remain authoritative. Durations reconcile in native ticks (also across offline saves),
+ * so a hidden effect regaining the foreground keeps its own source, not a covering effect's source.
+ */
+final class OngoingDamage {
+    record Application(CombatSources.Origin source, CombatSources.Origin target) { }
+    private record Layer(int amplifier, int duration, Application application) { }
+    private static final List<DamageCause> CAUSES = List.of(DamageCause.POISON, DamageCause.WITHER, DamageCause.FIRE_TICK);
+    private static NamespacedKey key(DamageCause cause) {
+        return new NamespacedKey("fantasystick", "combat_dot_" + cause.name().toLowerCase(java.util.Locale.ROOT) + "_v1");
+    }
+    static DamageCause cause(PotionEffectType type) {
+        if (type.equals(PotionEffectType.POISON)) return DamageCause.POISON;
+        if (type.equals(PotionEffectType.WITHER)) return DamageCause.WITHER;
+        return null;
+    }
+    static void clear(Player player, DamageCause cause) { player.getPersistentDataContainer().remove(key(cause)); }
+    static void potion(Player player, PotionEffect old, PotionEffect incoming, boolean override, Application application) {
+        var cause = cause(incoming.getType());
+        var layers = old == null ? new ArrayList<Layer>() : reconcile(load(player, cause), old.getAmplifier(), old.getDuration());
+        var next = new Layer(incoming.getAmplifier(), incoming.getDuration(), application);
+        // Purpur also stores a longer weaker effect behind the active one when override=false.
+        if (layers.isEmpty() || override || next.amplifier() < layers.getFirst().amplifier()
+                && longer(next.duration(), layers.getFirst().duration())) merge(layers, 0, next);
+        save(player, cause, layers);
+    }
+    private static boolean longer(int a, int b) { return a == -1 ? b != -1 : b != -1 && a > b; }
+    private static void merge(List<Layer> layers, int index, Layer next) {
+        if (index == layers.size()) { layers.add(next); return; }
+        var old = layers.get(index);
+        if (next.amplifier() > old.amplifier()) {
+            if (longer(old.duration(), next.duration())) layers.add(index, next);
+            else layers.set(index, next);
+        } else if (next.amplifier() == old.amplifier()) {
+            if (longer(next.duration(), old.duration())) layers.set(index, next);
+        } else if (longer(next.duration(), old.duration())) merge(layers, index + 1, next);
+    }
+    static void fire(Player player, int duration, Application application) {
+        save(player, DamageCause.FIRE_TICK, List.of(new Layer(0, duration, application)));
+    }
+    static Application read(Player player, DamageCause cause) {
+        if (!CAUSES.contains(cause) || !player.getPersistentDataContainer().has(key(cause))) return null;
+        List<Layer> layers = load(player, cause);
+        if (cause == DamageCause.FIRE_TICK) {
+            int fire = player.getFireTicks();
+            layers = fire > 0 && !layers.isEmpty() && fire <= layers.getFirst().duration()
+                ? List.of(new Layer(0, fire, layers.getFirst().application())) : List.of();
+        } else {
+            var effect = player.getPotionEffect(cause == DamageCause.POISON ? PotionEffectType.POISON : PotionEffectType.WITHER);
+            layers = effect == null ? List.of() : reconcile(layers, effect.getAmplifier(), effect.getDuration());
+        }
+        save(player, cause, layers);
+        return layers.isEmpty() ? null : layers.getFirst().application();
+    }
+    static void sweep(Player player) { for (var cause : CAUSES) read(player, cause); }
+
+    private static ArrayList<Layer> reconcile(List<Layer> saved, int amplifier, int duration) {
+        var result = new ArrayList<Layer>();
+        for (int i = 0; i < saved.size(); i++) {
+            var layer = saved.get(i);
+            if (layer.amplifier() != amplifier || longer(duration, layer.duration())) continue;
+            int elapsed = layer.duration() == -1 ? 0 : layer.duration() - duration;
+            for (int j = i; j < saved.size(); j++) {
+                var remaining = saved.get(j);
+                int ticks = remaining.duration() == -1 ? -1 : Math.max(0, remaining.duration() - elapsed);
+                if (ticks != 0) result.add(new Layer(remaining.amplifier(), ticks, remaining.application()));
+            }
+            return result;
+        }
+        // Unknown/out-of-band replacement never borrows old attribution or gains party immunity.
+        if (duration != 0) result.add(new Layer(amplifier, duration, null));
+        return result;
+    }
+    private static List<Layer> load(Player player, DamageCause cause) {
+        String value = player.getPersistentDataContainer().get(key(cause), PersistentDataType.STRING);
+        if (value == null || value.length() > 65536) return List.of();
+        var result = new ArrayList<Layer>();
+        try {
+            for (var row : value.split("\n", -1)) {
+                var cells = row.split(",", -1);
+                if (cells.length != 4 || result.size() >= 256) return List.of();
+                int amplifier = Integer.parseInt(cells[0]), duration = Integer.parseInt(cells[1]);
+                if (amplifier < 0 || amplifier > 255 || duration < -1 || duration == 0
+                        || !result.isEmpty() && amplifier >= result.getLast().amplifier()) return List.of();
+                Application application = null;
+                if (!cells[2].equals("-") || !cells[3].equals("-")) {
+                    var source = CombatSources.Origin.decode(cells[2]);
+                    var target = CombatSources.Origin.decode(cells[3]);
+                    if (source == null || target == null || !target.player().equals(player.getUniqueId())) return List.of();
+                    application = new Application(source, target);
+                }
+                result.add(new Layer(amplifier, duration, application));
+            }
+        } catch (IllegalArgumentException malformed) { return List.of(); }
+        return result;
+    }
+    private static void save(Player player, DamageCause cause, List<Layer> layers) {
+        if (layers.stream().noneMatch(layer -> layer.application() != null)) { clear(player, cause); return; }
+        var value = new StringBuilder();
+        for (var layer : layers) {
+            if (!value.isEmpty()) value.append('\n');
+            value.append(layer.amplifier()).append(',').append(layer.duration()).append(',');
+            var application = layer.application();
+            value.append(application == null ? "-,-" : application.source().encode() + "," + application.target().encode());
+        }
+        player.getPersistentDataContainer().set(key(cause), PersistentDataType.STRING, value.toString());
+    }
+}

src/main/java/games/dmg/fantasystick/party/PartyCombat.java

@@ -0,0 +1,127 @@
+package games.dmg.fantasystick.party;
+
+import games.dmg.fantasystick.session.EquipmentSessions;
+import java.util.Objects;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.entity.EntityDamageByEntityEvent;
+import org.bukkit.event.entity.EntityDamageEvent;
+import org.bukkit.event.entity.EntitySpawnEvent;
+import org.bukkit.event.entity.LingeringPotionSplashEvent;
+
+/** Server-thread native damage protection; never uncancels another protection's decision. */
+public final class PartyCombat implements Listener, AutoCloseable {
+    private org.bukkit.scheduler.BukkitTask cleanup;
+    private boolean closed;
+    private final PartyRoster parties;
+    private final CombatSources sources;
+
+    public PartyCombat(PartyRoster parties, EquipmentSessions sessions) {
+        this.parties = Objects.requireNonNull(parties);
+        this.sources = new CombatSources(sessions);
+    }
+
+    public void install(org.bukkit.plugin.Plugin plugin) {
+        cleanup = plugin.getServer().getScheduler().runTaskTimer(plugin, () -> {
+            if (!closed) for (var player : plugin.getServer().getOnlinePlayers()) OngoingDamage.sweep(player);
+        }, 1, 1);
+    }
+
+    @Override public void close() {
+        closed = true;
+        if (cleanup != null) cleanup.cancel();
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void launch(EntitySpawnEvent event) { sources.launch(event.getEntity()); }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void impact(org.bukkit.event.entity.ProjectileHitEvent event) {
+        var origin = sources.read(event.getEntity());
+        if (origin != null && (!sources.current(origin) || !(event.getEntity() instanceof org.bukkit.entity.ThrownPotion)
+                && event.getHitEntity() instanceof Player target && blocked(origin, target))) event.setCancelled(true);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void splash(org.bukkit.event.entity.PotionSplashEvent event) {
+        // Native splash passes only its owner to addEffect, losing the projectile's session.
+        // Revoke stale continuation here. Valid healing and unrelated recipients are untouched;
+        // actual harmful applications and instantaneous damage have their own guards below.
+        var origin = sources.read(event.getEntity());
+        if (origin != null && !sources.current(origin)) event.setCancelled(true);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void staleLingering(LingeringPotionSplashEvent event) {
+        var origin = sources.read(event.getEntity());
+        if (origin != null && !sources.current(origin)) event.setCancelled(true);
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void lingering(LingeringPotionSplashEvent event) {
+        sources.store(event.getAreaEffectCloud(), sources.read(event.getEntity()));
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void damage(EntityDamageEvent event) {
+        if (event.getEntity() instanceof Player target) {
+            var ongoing = OngoingDamage.read(target, event.getCause());
+            if (ongoing != null && (!sources.current(ongoing.target()) || blocked(ongoing.source(), target))) {
+                event.setCancelled(true); return;
+            }
+        }
+        var origin = sources.read(event.getDamageSource().getDirectEntity());
+        if (origin == null && event instanceof EntityDamageByEntityEvent entity) origin = sources.read(entity.getDamager());
+        if (origin == null) origin = sources.read(event.getDamageSource().getCausingEntity());
+        if (origin != null && (!sources.current(origin)
+                || event.getEntity() instanceof Player target && blocked(origin, target))) event.setCancelled(true);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void potion(org.bukkit.event.entity.EntityPotionEffectEvent event) {
+        if (!(event.getEntity() instanceof Player target) || event.getNewEffect() == null
+                || OngoingDamage.cause(event.getModifiedType()) == null) return;
+        var origin = sources.read(event.getSource());
+        if (origin != null && blocked(origin, target)) event.setCancelled(true);
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void acceptedPotion(org.bukkit.event.entity.EntityPotionEffectEvent event) {
+        if (!(event.getEntity() instanceof Player target)) return;
+        var cause = OngoingDamage.cause(event.getModifiedType());
+        if (cause == null) return;
+        if (event.getNewEffect() == null) OngoingDamage.clear(target, cause);
+        else {
+            var origin = sources.read(event.getSource());
+            OngoingDamage.potion(target, event.getOldEffect(), event.getNewEffect(), event.isOverride(), origin == null ? null
+                : new OngoingDamage.Application(origin, sources.player(target.getUniqueId())));
+        }
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void combust(org.bukkit.event.entity.EntityCombustByEntityEvent event) {
+        if (!(event.getEntity() instanceof Player target)) return;
+        var origin = sources.read(event.getCombuster());
+        if (origin != null && blocked(origin, target)) event.setCancelled(true);
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void acceptedCombust(org.bukkit.event.entity.EntityCombustEvent event) {
+        if (!(event.getEntity() instanceof Player target)) return;
+        var origin = event instanceof org.bukkit.event.entity.EntityCombustByEntityEvent entity
+            ? sources.read(entity.getCombuster()) : null;
+        int duration = Math.max(target.getFireTicks(), (int) Math.ceil(event.getDuration() * 20));
+        OngoingDamage.fire(target, duration, origin == null ? null
+            : new OngoingDamage.Application(origin, sources.player(target.getUniqueId())));
+    }
+
+    private boolean blocked(CombatSources.Origin origin, Player target) {
+        var recipient = sources.player(target.getUniqueId());
+        boolean fantasy = origin.session() != null;
+        return !sources.current(origin) || fantasy != (recipient.session() != null) || fantasy
+            && !origin.player().equals(recipient.player())
+            && parties.partyOf(origin.player()).filter(group -> group.members().contains(recipient.player())).isPresent();
+    }
+}

src/main/java/games/dmg/fantasystick/party/PartyEvents.java

@@ -0,0 +1,17 @@
+package games.dmg.fantasystick.party;
+
+import java.util.Objects;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerQuitEvent;
+
+/** Quit is authoritative even before Bukkit's online flag changes. */
+public final class PartyEvents implements Listener {
+    private final PartyRoster parties;
+    public PartyEvents(PartyRoster parties) { this.parties = Objects.requireNonNull(parties); }
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void join(org.bukkit.event.player.PlayerJoinEvent event) { parties.arrive(event.getPlayer().getUniqueId()); }
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void quit(PlayerQuitEvent event) { parties.disconnect(event.getPlayer().getUniqueId()); }
+}

src/main/java/games/dmg/fantasystick/party/PartyRoster.java

@@ -0,0 +1,122 @@
+package games.dmg.fantasystick.party;
+
+import java.time.Clock;
+import java.time.Instant;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.UUID;
+import java.util.function.Predicate;
+
+/** Server-thread-confined, player-owned parties. No state survives a plugin/server restart. */
+public final class PartyRoster implements AutoCloseable {
+    public record Party(UUID id, UUID leader, List<UUID> members) {
+        public Party { members = List.copyOf(members); }
+    }
+    public record Invitation(UUID id, UUID party, UUID leader, UUID invitee, Instant expires) { }
+    private final Map<UUID, Party> membership = new HashMap<>();
+    private final Map<UUID, Invitation> invitations = new HashMap<>();
+    private final Set<UUID> departed = new HashSet<>();
+    private boolean closed;
+    private final Clock clock;
+    private final Predicate<UUID> online;
+
+    public PartyRoster(Clock clock, Predicate<UUID> online) {
+        this.clock = Objects.requireNonNull(clock);
+        this.online = Objects.requireNonNull(online);
+    }
+    public Optional<Party> create(UUID player) {
+        if (closed || !connected(player) || membership.containsKey(player)) return Optional.empty();
+        var party = new Party(UUID.randomUUID(), player, List.of(player));
+        membership.put(player, party);
+        return Optional.of(party);
+    }
+    public Optional<Party> partyOf(UUID player) { return Optional.ofNullable(membership.get(player)); }
+    public List<Invitation> invitationsFor(UUID player) {
+        expire();
+        return invitations.values().stream().filter(i -> i.invitee().equals(player))
+            .sorted(java.util.Comparator.comparing(Invitation::expires).thenComparing(Invitation::id)).toList();
+    }
+    public Optional<Invitation> invite(UUID leader, UUID party, UUID invitee) {
+        expire();
+        var group = managedBy(leader, party);
+        if (group == null || group.members().size() >= 6 || !connected(invitee) || membership.containsKey(invitee)) return Optional.empty();
+        var existing = invitations.values().stream().filter(i -> i.party().equals(party) && i.invitee().equals(invitee)).findFirst();
+        if (existing.isPresent()) return existing;
+        var invitation = new Invitation(UUID.randomUUID(), party, leader, invitee, clock.instant().plusSeconds(60));
+        invitations.put(invitation.id(), invitation);
+        return Optional.of(invitation);
+    }
+    public boolean accept(UUID player, UUID invitation) {
+        expire();
+        var offer = invitations.get(invitation);
+        if (offer == null || !offer.invitee().equals(player) || !connected(player) || membership.containsKey(player)) return false;
+        var group = membership.get(offer.leader());
+        if (group == null || group.members().size() >= 6 || !group.id().equals(offer.party())) return false;
+        var members = new ArrayList<>(group.members());
+        members.add(player);
+        var updated = new Party(group.id(), group.leader(), members);
+        for (var member : members) membership.put(member, updated);
+        invitations.values().removeIf(i -> i.invitee().equals(player));
+        return true;
+    }
+    public boolean kick(UUID leader, UUID party, UUID member) {
+        var group = managedBy(leader, party);
+        if (group == null || !group.members().contains(member) || member.equals(leader)) return false;
+        removeMember(group, member);
+        return true;
+    }
+    public boolean disband(UUID leader, UUID party) {
+        var group = managedBy(leader, party);
+        if (group == null) return false;
+        remove(group);
+        return true;
+    }
+    private Party managedBy(UUID leader, UUID party) {
+        var group = membership.get(leader);
+        return group != null && group.id().equals(party) && group.leader().equals(leader) && connected(leader) ? group : null;
+    }
+    public boolean leave(UUID player, UUID party) {
+        var group = membership.get(player);
+        if (group == null || !group.id().equals(party) || !connected(player)) return false;
+        if (group.leader().equals(player)) remove(group);
+        else removeMember(group, player);
+        return true;
+    }
+    private void removeMember(Party group, UUID player) {
+        var remaining = group.members().stream().filter(member -> !member.equals(player)).toList();
+        if (remaining.stream().noneMatch(this::connected)) { remove(group); return; }
+        membership.remove(player);
+        departed.remove(player);
+        var updated = new Party(group.id(), group.leader(), remaining);
+        for (var member : remaining) membership.put(member, updated);
+    }
+    public void arrive(UUID player) { departed.remove(player); }
+    public void disconnect(UUID player) {
+        var group = membership.get(player);
+        if (group == null) return;
+        departed.add(player);
+        if (group.members().stream().noneMatch(this::connected)) remove(group);
+    }
+    private boolean connected(UUID player) { return !departed.contains(player) && online.test(player); }
+    private void expire() {
+        var now = clock.instant();
+        invitations.values().removeIf(i -> !now.isBefore(i.expires()));
+    }
+    private void remove(Party group) {
+        for (var member : group.members()) membership.remove(member);
+        departed.removeAll(group.members());
+        invitations.values().removeIf(i -> i.party().equals(group.id()));
+    }
+    @Override public void close() {
+        closed = true;
+        membership.clear();
+        invitations.clear();
+        departed.clear();
+    }
+}

src/main/java/games/dmg/fantasystick/persistence/AdventureSettings.java

@@ -0,0 +1,132 @@
+package games.dmg.fantasystick.persistence;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.channels.FileChannel;
+import java.nio.channels.OverlappingFileLockException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.LinkOption;
+import java.nio.file.Path;
+import java.nio.file.StandardCopyOption;
+import java.nio.file.StandardOpenOption;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.Objects;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.CompletionStage;
+import java.util.concurrent.Executors;
+import java.util.concurrent.RejectedExecutionException;
+import org.yaml.snakeyaml.LoaderOptions;
+import org.yaml.snakeyaml.Yaml;
+import org.yaml.snakeyaml.constructor.SafeConstructor;
+
+/** Worker-owned config writes; publish a new-session policy only after durable file acknowledgment. */
+public final class AdventureSettings implements AutoCloseable {
+    private static final int MAX_BYTES = 1_048_576;
+    @FunctionalInterface interface Replacement { void move(Path from, Path to) throws IOException; }
+    private final Path directory;
+    private final Replacement replacement;
+    private final java.util.concurrent.ExecutorService worker = Executors.newSingleThreadExecutor(
+        task -> new Thread(task, "fantasy-configuration-persistence"));
+    private volatile boolean enabled;
+    private boolean closed;
+    private int pending;
+    private final CompletableFuture<Void> drained = new CompletableFuture<>();
+
+    public AdventureSettings(Path directory, boolean initial) {
+        this(directory, initial, (from, to) -> Files.move(from, to,
+            StandardCopyOption.ATOMIC_MOVE, StandardCopyOption.REPLACE_EXISTING));
+    }
+
+    AdventureSettings(Path directory, boolean initial, Replacement replacement) {
+        this.directory = Objects.requireNonNull(directory).toAbsolutePath();
+        this.replacement = Objects.requireNonNull(replacement);
+        enabled = initial;
+    }
+
+    public static boolean validate(Object configured) {
+        if (configured == null) return true;
+        if (configured instanceof Boolean value) return value;
+        throw new IllegalArgumentException("adventure-mode must be true or false");
+    }
+
+    public boolean enabled() { return enabled; }
+
+    public synchronized CompletionStage<Boolean> set(boolean value) {
+        if (closed) return CompletableFuture.failedStage(new IOException("Configuration store is closed"));
+        pending++;
+        try {
+            return CompletableFuture.supplyAsync(() -> {
+                try { save(value); enabled = value; return value; }
+                catch (IOException | RuntimeException failure) {
+                    // No parser contents, filesystem paths or configuration values in diagnostics.
+                    throw new java.util.concurrent.CompletionException(new IOException(
+                        "Adventure configuration save refused or failed; effective setting unchanged"));
+                } finally { finished(); }
+            }, worker).minimalCompletionStage();
+        } catch (RejectedExecutionException rejected) {
+            finished();
+            return CompletableFuture.failedStage(new IOException("Configuration store is closed"));
+        }
+    }
+
+    private void save(boolean value) throws IOException {
+        Files.createDirectories(directory);
+        if (!Files.isDirectory(directory, LinkOption.NOFOLLOW_LINKS)) throw new IOException("Unsafe directory");
+        var file = directory.resolve("config.yml");
+        var lockFile = directory.resolve(".config.lock");
+        if (Files.exists(lockFile, LinkOption.NOFOLLOW_LINKS)
+                && !Files.isRegularFile(lockFile, LinkOption.NOFOLLOW_LINKS)) throw new IOException("Unsafe lock");
+        try (var channel = FileChannel.open(lockFile, StandardOpenOption.CREATE, StandardOpenOption.WRITE, LinkOption.NOFOLLOW_LINKS);
+             var lock = channel.tryLock()) {
+            if (lock == null) throw new IOException("Configuration busy");
+            var options = new LoaderOptions();
+            options.setAllowDuplicateKeys(false);
+            options.setMaxAliasesForCollections(20);
+            options.setCodePointLimit(MAX_BYTES);
+            var yaml = new Yaml(new SafeConstructor(options));
+            Map<String, Object> values = new LinkedHashMap<>();
+            if (Files.exists(file, LinkOption.NOFOLLOW_LINKS)) {
+                if (!Files.isRegularFile(file, LinkOption.NOFOLLOW_LINKS)) throw new IOException("Unsafe configuration");
+                byte[] bytes;
+                try (var input = Files.newInputStream(file, LinkOption.NOFOLLOW_LINKS)) { bytes = input.readNBytes(MAX_BYTES + 1); }
+                if (bytes.length > MAX_BYTES) throw new IOException("Configuration too large");
+                Object loaded = yaml.load(StandardCharsets.UTF_8.newDecoder().decode(ByteBuffer.wrap(bytes)).toString());
+                if (loaded != null) {
+                    if (!(loaded instanceof Map<?, ?> map)) throw new IOException("Invalid configuration root");
+                    for (var entry : map.entrySet()) {
+                        if (!(entry.getKey() instanceof String key)) throw new IOException("Invalid configuration key");
+                        values.put(key, entry.getValue());
+                    }
+                }
+            }
+            values.put("adventure-mode", value);
+            byte[] bytes = yaml.dump(values).getBytes(StandardCharsets.UTF_8);
+            if (bytes.length > MAX_BYTES) throw new IOException("Configuration too large");
+            Path temporary = Files.createTempFile(directory, ".config-", ".tmp");
+            try {
+                try (var output = FileChannel.open(temporary, StandardOpenOption.WRITE, LinkOption.NOFOLLOW_LINKS)) {
+                    var buffer = ByteBuffer.wrap(bytes);
+                    while (buffer.hasRemaining()) output.write(buffer);
+                    output.force(true);
+                }
+                replacement.move(temporary, file);
+            } finally { Files.deleteIfExists(temporary); }
+        } catch (OverlappingFileLockException busy) { throw new IOException("Configuration busy"); }
+    }
+
+    private synchronized void finished() {
+        pending--;
+        if (closed && pending == 0) drained.complete(null);
+    }
+
+    public CompletionStage<Void> drained() { return drained.minimalCompletionStage(); }
+
+    /** Drain accepted writes without waiting on the server thread. */
+    @Override public synchronized void close() {
+        closed = true;
+        worker.shutdown();
+        if (pending == 0) drained.complete(null);
+    }
+}

src/main/java/games/dmg/fantasystick/persistence/CharacterRecord.java

@@ -1,5 +1,6 @@
 package games.dmg.fantasystick.persistence;
 
+import games.dmg.fantasystick.progression.CombatRewardRules;
 import games.dmg.fantasystick.progression.Stat;
 import java.math.BigDecimal;
 import java.math.BigInteger;
@@ -16,7 +17,16 @@ public record CharacterRecord(
         UUID id, String name, BigInteger revision, Map<Stat, BigInteger> stats,
         int level, BigInteger experience, BigInteger unspentPoints, BigDecimal health,
         Set<String> learned, List<String> loadout, Map<String, Instant> cooldowns,
+        Map<UUID, CombatRewardRules.KillPosition> restrictedKills,
         boolean dead, UUID deathId, Instant diedAt) {
+    public CharacterRecord(UUID id, String name, BigInteger revision, Map<Stat, BigInteger> stats,
+                           int level, BigInteger experience, BigInteger unspentPoints, BigDecimal health,
+                           Set<String> learned, List<String> loadout, Map<String, Instant> cooldowns,
+                           boolean dead, UUID deathId, Instant diedAt) {
+        this(id, name, revision, stats, level, experience, unspentPoints, health, learned, loadout,
+            cooldowns, Map.of(), dead, deathId, diedAt);
+    }
+
     public CharacterRecord {
         Objects.requireNonNull(id);
         Objects.requireNonNull(name);
@@ -28,6 +38,7 @@ public record CharacterRecord(
         learned = Set.copyOf(learned);
         loadout = List.copyOf(loadout);
         cooldowns = Map.copyOf(cooldowns);
+        restrictedKills = Map.copyOf(restrictedKills);
         if (revision.signum() < 0 || experience.signum() < 0 || unspentPoints.signum() < 0 || level < 1
                 || !stats.keySet().equals(EnumSet.allOf(Stat.class))
                 || stats.values().stream().anyMatch(value -> value.signum() < 0)
@@ -35,6 +46,8 @@ public record CharacterRecord(
                 || health.compareTo(new BigDecimal(stats.get(Stat.CON).add(BigInteger.TEN))) > 0
                 || loadout.size() != 7 || learned.stream().anyMatch(String::isBlank)
                 || cooldowns.keySet().stream().anyMatch(String::isBlank)
+                || restrictedKills.size() > 1024
+                || restrictedKills.entrySet().stream().anyMatch(entry -> !entry.getKey().equals(entry.getValue().world()))
                 || (deathId == null) != (diedAt == null) || dead && deathId == null) {
             throw new IllegalArgumentException("Invalid character record");
         }

src/main/java/games/dmg/fantasystick/persistence/CharacterStorage.java

@@ -1,10 +1,16 @@
 package games.dmg.fantasystick.persistence;
 
+import games.dmg.fantasystick.progression.ProgressionRules;
+import games.dmg.fantasystick.progression.Stat;
 import java.io.IOException;
 import java.math.BigInteger;
 import java.time.Clock;
 import java.time.Duration;
 import java.time.Instant;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
 import java.util.Objects;
 import java.util.Optional;
 import java.util.UUID;
@@ -33,30 +39,465 @@ public final class CharacterStorage implements AutoCloseable {
         });
     }
 
+    /**
+     * Prepare already allocated fresh characters off-thread. The caller validates configured
+     * starting points and retains the returned handle through success, cancellation and disable.
+     * No inventory access occurs here; abandoning an observer is not abandoning the attempt.
+     */
+    public CraftPreparation prepareCraft(List<CharacterRecord> records) {
+        var snapshot = List.copyOf(records);
+        var ids = new HashSet<UUID>();
+        if (snapshot.isEmpty()) throw new IllegalArgumentException("Craft batch must not be empty");
+        for (var record : snapshot) {
+            if (!ids.add(record.id()) || record.revision().signum() != 0 || record.name().isBlank()
+                    || record.dead() || record.deathId() != null || record.level() != 1
+                    || record.experience().signum() != 0 || record.stats().values().stream().anyMatch(value -> value.signum() != 0)
+                    || record.health().compareTo(java.math.BigDecimal.TEN) != 0
+                    || !record.learned().isEmpty() || !record.cooldowns().isEmpty()
+                    || record.loadout().stream().anyMatch(ability -> !ability.isEmpty())) {
+                throw new IllegalArgumentException("Craft batch requires distinct new characters");
+            }
+        }
+        return new CraftPreparation(snapshot);
+    }
+
+    public final class CraftPreparation {
+        private final List<CharacterRecord> requested;
+        private final CompletableFuture<CraftBatch> completion;
+        private volatile boolean abandoned;
+        private CompletableFuture<CraftCleanup> cleanup;
+
+        private CraftPreparation(List<CharacterRecord> records) {
+            requested = records;
+            completion = writeCraftBatch(records, this);
+        }
+
+        /** Observation only; cancelling/timing out this copy does not cancel the owned operation. */
+        public CompletableFuture<CraftBatch> ready() { return completion.copy(); }
+
+        /** Retain this handle through completion; invalidate the attempt, not an observation future. */
+        public synchronized CompletableFuture<CraftCleanup> abandon() {
+            abandoned = true;
+            if (cleanup == null) {
+                cleanup = completion.handle((batch, failure) -> {
+                    if (batch != null) return batch.abandon();
+                    var cause = failure instanceof CompletionException ? failure.getCause() : failure;
+                    var outcome = cause instanceof CraftPreparationException preparation ? preparation.cleanup()
+                        : retainAll(requested);
+                    return CompletableFuture.completedFuture(outcome);
+                }).thenCompose(result -> result);
+            }
+            return cleanup.copy();
+        }
+    }
+
+    private CompletableFuture<CraftBatch> writeCraftBatch(List<CharacterRecord> snapshot, CraftPreparation owner) {
+        return submit(() -> {
+            var created = new ArrayList<YamlCharacterRepository.Creation>();
+            UUID attempted = null;
+            try {
+                for (var record : snapshot) {
+                    if (owner.abandoned) break;
+                    attempted = record.id();
+                    created.add(repository.createTracked(record));
+                    attempted = null;
+                }
+                return new CraftBatch(created, owner);
+            } catch (IOException | RuntimeException failure) {
+                var cleanup = discardUnissued(created);
+                var retained = new HashSet<>(cleanup.retained());
+                if (attempted != null) retained.add(attempted);
+                throw new CraftPreparationException(failure, new CraftCleanup(cleanup.removed(), retained));
+            }
+        });
+    }
+
+    public static final class CraftPreparationException extends IOException {
+        @java.io.Serial private static final long serialVersionUID = 1L;
+        private final transient CraftCleanup cleanup;
+
+        private CraftPreparationException(Throwable cause, CraftCleanup cleanup) {
+            super("Character craft preparation failed; no batch was issued", cause);
+            this.cleanup = cleanup;
+        }
+
+        public CraftCleanup cleanup() { return cleanup; }
+    }
+
+    /** Removed includes already-absent files; retained includes failed writes whose outcome is unknown. */
+    public record CraftCleanup(Set<UUID> removed, Set<UUID> retained) {
+        public CraftCleanup {
+            removed = Set.copyOf(removed);
+            retained = Set.copyOf(retained);
+        }
+    }
+
+    public final class CraftBatch {
+        private final List<CharacterRecord> records;
+        private final List<YamlCharacterRepository.Creation> created;
+        private final CraftPreparation owner;
+        private boolean resolved;
+        private CompletableFuture<CraftCleanup> cleanup;
+
+        private CraftBatch(List<YamlCharacterRepository.Creation> created, CraftPreparation owner) {
+            this.owner = owner;
+            this.created = List.copyOf(created);
+            this.records = created.stream().map(creation -> creation.record).toList();
+        }
+
+        /** Reject a wrong-sized batch before giving up its never-issued cleanup proof. */
+        public synchronized Optional<List<CharacterRecord>> claimForDelivery(int expectedQuantity) {
+            if (expectedQuantity < 1 || records.size() != expectedQuantity) return Optional.empty();
+            return claimForDelivery();
+        }
+
+        /** One-use handoff immediately before native delivery; an exception afterward cannot authorize deletion. */
+        public synchronized Optional<List<CharacterRecord>> claimForDelivery() {
+            if (resolved || owner.abandoned) return Optional.empty();
+            resolved = true;
+            if (worker.isShutdown()) return Optional.empty();
+            return Optional.of(records);
+        }
+
+        public synchronized CompletableFuture<CraftCleanup> abandon() {
+            if (cleanup == null) {
+                if (resolved) {
+                    cleanup = CompletableFuture.completedFuture(retainAll(records));
+                } else {
+                    resolved = true;
+                    cleanup = submit(() -> discardUnissued(created)).exceptionally(failure -> retainAll(records));
+                }
+            }
+            return cleanup.copy();
+        }
+    }
+
+    private static CraftCleanup retainAll(List<CharacterRecord> records) {
+        return new CraftCleanup(Set.of(), records.stream().map(CharacterRecord::id)
+            .collect(java.util.stream.Collectors.toSet()));
+    }
+
+    private CraftCleanup discardUnissued(List<YamlCharacterRepository.Creation> created) {
+        var removed = new HashSet<UUID>();
+        var retained = new HashSet<UUID>();
+        for (var creation : created) {
+            try {
+                if (repository.discardUnissued(creation)) removed.add(creation.record.id());
+                else retained.add(creation.record.id());
+            } catch (IOException exception) {
+                retained.add(creation.record.id());
+            }
+        }
+        return new CraftCleanup(removed, retained);
+    }
+
     public CompletableFuture<Optional<CharacterRecord>> find(UUID id) {
         return submit(() -> repository.load(id));
     }
 
-    public CompletableFuture<Optional<CharacterRecord>> recordDeath(UUID characterId, BigInteger expectedRevision) {
+    /** Persist an accepted native rename against the latest live record; never create a character from item metadata. */
+    public CompletableFuture<Optional<CharacterRecord>> renameCharacter(UUID characterId, String name) {
+        Objects.requireNonNull(characterId);
+        Objects.requireNonNull(name);
+        return submit(() -> {
+            var found = repository.load(characterId);
+            if (found.isEmpty() || found.orElseThrow().dead()) return Optional.empty();
+            var old = found.orElseThrow();
+            if (old.name().equals(name)) return Optional.of(old);
+            var renamed = new CharacterRecord(old.id(), name, old.revision().add(BigInteger.ONE), old.stats(), old.level(),
+                old.experience(), old.unspentPoints(), old.health(), old.learned(), old.loadout(), old.cooldowns(),
+                old.restrictedKills(), false, old.deathId(), old.diedAt());
+            repository.replace(renamed, old.revision());
+            return Optional.of(renamed);
+        });
+    }
+
+    public enum ExperienceAwardStatus { APPLIED, AT_CAP, UNCHANGED, STALE, UNAVAILABLE }
+    public record ExperienceAward(ExperienceAwardStatus status, Optional<CharacterRecord> record, int levels) { }
+
+    /** Persist configured transferable XP/level/point progression as one expected revision. */
+    public CompletableFuture<ExperienceAward> awardExperience(UUID characterId, BigInteger expectedRevision,
+                                                               BigInteger reward, ProgressionRules rules) {
         Objects.requireNonNull(characterId);
         Objects.requireNonNull(expectedRevision);
+        Objects.requireNonNull(reward);
+        Objects.requireNonNull(rules);
+        if (reward.signum() < 0) throw new IllegalArgumentException("Experience reward must not be negative");
+        return submit(() -> {
+            var found = repository.load(characterId);
+            if (found.isEmpty() || found.orElseThrow().dead()) {
+                return new ExperienceAward(ExperienceAwardStatus.UNAVAILABLE, Optional.empty(), 0);
+            }
+            var old = found.orElseThrow();
+            if (!old.revision().equals(expectedRevision)) {
+                return new ExperienceAward(ExperienceAwardStatus.STALE, Optional.of(old), 0);
+            }
+            var cap = rules.xpPerLevel().multiply(BigInteger.valueOf(rules.maximumLevel() - 1L));
+            if (old.level() >= rules.maximumLevel() || old.experience().compareTo(cap) >= 0) {
+                return new ExperienceAward(ExperienceAwardStatus.AT_CAP, Optional.of(old), 0);
+            }
+            var experience = old.experience().add(reward).min(cap);
+            if (experience.equals(old.experience())) {
+                var status = old.level() >= rules.maximumLevel()
+                    ? ExperienceAwardStatus.AT_CAP : ExperienceAwardStatus.UNCHANGED;
+                return new ExperienceAward(status, Optional.of(old), 0);
+            }
+            int level = experience.divide(rules.xpPerLevel()).intValueExact() + 1;
+            int gained = Math.max(0, level - old.level());
+            var saved = new CharacterRecord(old.id(), old.name(), old.revision().add(BigInteger.ONE), old.stats(),
+                level, experience, old.unspentPoints().add(BigInteger.valueOf(gained)), old.health(), old.learned(),
+                old.loadout(), old.cooldowns(), old.restrictedKills(), false, old.deathId(), old.diedAt());
+            repository.replace(saved, old.revision());
+            return new ExperienceAward(ExperienceAwardStatus.APPLIED, Optional.of(saved), gained);
+        });
+    }
+
+    public enum CombatAwardStatus { APPLIED, SPACING_BLOCKED, AT_CAP, UNCHANGED, STALE, UNAVAILABLE }
+    public record CombatAward(CombatAwardStatus status, Optional<CharacterRecord> record, int levels) { }
+
+    /** Persist one combat share and its restricted-kill reference in the same character revision. */
+    public CompletableFuture<CombatAward> awardCombatExperience(UUID characterId, BigInteger expectedRevision,
+            BigInteger reward, ProgressionRules progression,
+            games.dmg.fantasystick.progression.CombatRewardRules rewards,
+            games.dmg.fantasystick.progression.CombatRewardRules.KillPosition restrictedKill) {
+        Objects.requireNonNull(characterId); Objects.requireNonNull(expectedRevision);
+        Objects.requireNonNull(reward); Objects.requireNonNull(progression); Objects.requireNonNull(rewards);
+        if (reward.signum() < 0) throw new IllegalArgumentException("Experience reward must not be negative");
+        return submit(() -> {
+            var found = repository.load(characterId);
+            if (found.isEmpty() || found.orElseThrow().dead()) {
+                return new CombatAward(CombatAwardStatus.UNAVAILABLE, Optional.empty(), 0);
+            }
+            var old = found.orElseThrow();
+            if (!old.revision().equals(expectedRevision)) {
+                return new CombatAward(CombatAwardStatus.STALE, Optional.of(old), 0);
+            }
+            boolean eligible = restrictedKill == null || old.restrictedKills().get(restrictedKill.world()) == null
+                || rewards.spaced(old.restrictedKills().get(restrictedKill.world()), restrictedKill);
+            var history = new java.util.HashMap<>(old.restrictedKills());
+            if (restrictedKill != null) history.put(restrictedKill.world(), restrictedKill);
+            var cap = progression.xpPerLevel().multiply(BigInteger.valueOf(progression.maximumLevel() - 1L));
+            boolean atCap = old.level() >= progression.maximumLevel() || old.experience().compareTo(cap) >= 0;
+            var experience = eligible && !atCap ? old.experience().add(reward).min(cap) : old.experience();
+            int level = atCap ? old.level() : experience.divide(progression.xpPerLevel()).intValueExact() + 1;
+            int gained = Math.max(0, level - old.level());
+            var status = !eligible ? CombatAwardStatus.SPACING_BLOCKED : atCap ? CombatAwardStatus.AT_CAP
+                : experience.equals(old.experience()) ? CombatAwardStatus.UNCHANGED : CombatAwardStatus.APPLIED;
+            if (history.equals(old.restrictedKills()) && experience.equals(old.experience())) {
+                return new CombatAward(status, Optional.of(old), 0);
+            }
+            var saved = new CharacterRecord(old.id(), old.name(), old.revision().add(BigInteger.ONE), old.stats(),
+                level, experience, old.unspentPoints().add(BigInteger.valueOf(gained)), old.health(), old.learned(),
+                old.loadout(), old.cooldowns(), history, false, old.deathId(), old.diedAt());
+            repository.replace(saved, old.revision());
+            return new CombatAward(status, Optional.of(saved), gained);
+        });
+    }
+
+    public enum AbilityMutationStatus {
+        APPLIED, UNCHANGED, STALE, REQUIREMENTS, NO_POINTS, ALREADY_LEARNED, NOT_LEARNED, COOLDOWN, UNAVAILABLE
+    }
+    public record AbilityMutation(AbilityMutationStatus status, Optional<CharacterRecord> record) { }
+
+    /** Unlock one validated registered ID and spend its points in the same expected revision. */
+    public CompletableFuture<AbilityMutation> unlockAbility(UUID characterId, BigInteger expectedRevision, String ability,
+            java.util.Map<Stat, BigInteger> requirements, BigInteger cost) {
+        Objects.requireNonNull(characterId); Objects.requireNonNull(expectedRevision); Objects.requireNonNull(ability);
+        Objects.requireNonNull(requirements); Objects.requireNonNull(cost);
+        if (ability.isBlank() || cost.signum() <= 0 || requirements.entrySet().stream().anyMatch(entry -> entry.getValue().compareTo(BigInteger.TEN) < 0)) {
+            throw new IllegalArgumentException("Invalid ability unlock");
+        }
+        return submit(() -> {
+            var found = repository.load(characterId);
+            if (found.isEmpty() || found.orElseThrow().dead()) return new AbilityMutation(AbilityMutationStatus.UNAVAILABLE, Optional.empty());
+            var old = found.orElseThrow();
+            if (!old.revision().equals(expectedRevision)) return new AbilityMutation(AbilityMutationStatus.STALE, Optional.of(old));
+            if (old.learned().contains(ability)) return new AbilityMutation(AbilityMutationStatus.ALREADY_LEARNED, Optional.of(old));
+            if (requirements.entrySet().stream().anyMatch(entry -> old.stats().get(entry.getKey()).compareTo(entry.getValue()) < 0)) {
+                return new AbilityMutation(AbilityMutationStatus.REQUIREMENTS, Optional.of(old));
+            }
+            if (old.unspentPoints().compareTo(cost) < 0) return new AbilityMutation(AbilityMutationStatus.NO_POINTS, Optional.of(old));
+            var learned = new java.util.HashSet<>(old.learned()); learned.add(ability);
+            var saved = new CharacterRecord(old.id(), old.name(), old.revision().add(BigInteger.ONE), old.stats(), old.level(),
+                old.experience(), old.unspentPoints().subtract(cost), old.health(), learned, old.loadout(), old.cooldowns(),
+                old.restrictedKills(), false, old.deathId(), old.diedAt());
+            repository.replace(saved, old.revision());
+            return new AbilityMutation(AbilityMutationStatus.APPLIED, Optional.of(saved));
+        });
+    }
+
+    /** Refund one learned ability exactly once, clear every equipped reference and retain its deadline. */
+    public CompletableFuture<AbilityMutation> unlearnAbility(UUID characterId, BigInteger expectedRevision, String ability) {
+        Objects.requireNonNull(characterId); Objects.requireNonNull(expectedRevision); Objects.requireNonNull(ability);
+        if (ability.isBlank()) throw new IllegalArgumentException("Invalid ability refund");
+        return submit(() -> {
+            var found = repository.load(characterId);
+            if (found.isEmpty() || found.orElseThrow().dead()) return new AbilityMutation(AbilityMutationStatus.UNAVAILABLE, Optional.empty());
+            var old = found.orElseThrow();
+            if (!old.revision().equals(expectedRevision)) return new AbilityMutation(AbilityMutationStatus.STALE, Optional.of(old));
+            if (!old.learned().contains(ability)) return new AbilityMutation(AbilityMutationStatus.NOT_LEARNED, Optional.of(old));
+            var learned = new java.util.HashSet<>(old.learned()); learned.remove(ability);
+            var loadout = old.loadout().stream().map(assigned -> assigned.equals(ability) ? "" : assigned).toList();
+            var saved = new CharacterRecord(old.id(), old.name(), old.revision().add(BigInteger.ONE), old.stats(), old.level(),
+                old.experience(), old.unspentPoints().add(BigInteger.ONE), old.health(), learned, loadout, old.cooldowns(),
+                old.restrictedKills(), false, old.deathId(), old.diedAt());
+            repository.replace(saved, old.revision());
+            return new AbilityMutation(AbilityMutationStatus.APPLIED, Optional.of(saved));
+        });
+    }
+
+    /** Move one learned ability to one of the seven selectable slots without duplicating it. */
+    public CompletableFuture<AbilityMutation> assignAbility(UUID characterId, BigInteger expectedRevision,
+                                                             String ability, int slot) {
+        Objects.requireNonNull(characterId); Objects.requireNonNull(expectedRevision); Objects.requireNonNull(ability);
+        if (ability.isBlank() || slot < 0 || slot >= 7) throw new IllegalArgumentException("Invalid ability assignment");
+        return submit(() -> {
+            var found = repository.load(characterId);
+            if (found.isEmpty() || found.orElseThrow().dead()) return new AbilityMutation(AbilityMutationStatus.UNAVAILABLE, Optional.empty());
+            var old = found.orElseThrow();
+            if (!old.revision().equals(expectedRevision)) return new AbilityMutation(AbilityMutationStatus.STALE, Optional.of(old));
+            if (!old.learned().contains(ability)) return new AbilityMutation(AbilityMutationStatus.NOT_LEARNED, Optional.of(old));
+            var loadout = new java.util.ArrayList<>(old.loadout());
+            for (int index = 0; index < loadout.size(); index++) if (loadout.get(index).equals(ability)) loadout.set(index, "");
+            loadout.set(slot, ability);
+            if (loadout.equals(old.loadout())) return new AbilityMutation(AbilityMutationStatus.UNCHANGED, Optional.of(old));
+            var saved = new CharacterRecord(old.id(), old.name(), old.revision().add(BigInteger.ONE), old.stats(), old.level(),
+                old.experience(), old.unspentPoints(), old.health(), old.learned(), loadout, old.cooldowns(),
+                old.restrictedKills(), false, old.deathId(), old.diedAt());
+            repository.replace(saved, old.revision());
+            return new AbilityMutation(AbilityMutationStatus.APPLIED, Optional.of(saved));
+        });
+    }
+
+    /** Commit a real-time character/ability deadline before exposing the cast's native effect. */
+    public CompletableFuture<AbilityMutation> commitAbilityCooldown(UUID characterId, BigInteger expectedRevision,
+                                                                     String ability, Instant readyAt) {
+        Objects.requireNonNull(characterId); Objects.requireNonNull(expectedRevision); Objects.requireNonNull(ability);
+        Objects.requireNonNull(readyAt);
+        if (ability.isBlank()) throw new IllegalArgumentException("Invalid ability cooldown");
+        return submit(() -> {
+            var found = repository.load(characterId);
+            if (found.isEmpty() || found.orElseThrow().dead()) return new AbilityMutation(AbilityMutationStatus.UNAVAILABLE, Optional.empty());
+            var old = found.orElseThrow();
+            if (!old.revision().equals(expectedRevision)) return new AbilityMutation(AbilityMutationStatus.STALE, Optional.of(old));
+            if (!old.learned().contains(ability)) return new AbilityMutation(AbilityMutationStatus.NOT_LEARNED, Optional.of(old));
+            Instant previous = old.cooldowns().get(ability);
+            if (previous != null && previous.isAfter(clock.instant())) return new AbilityMutation(AbilityMutationStatus.COOLDOWN, Optional.of(old));
+            if (readyAt.equals(previous)) return new AbilityMutation(AbilityMutationStatus.UNCHANGED, Optional.of(old));
+            var cooldowns = new java.util.HashMap<>(old.cooldowns()); cooldowns.put(ability, readyAt);
+            var saved = new CharacterRecord(old.id(), old.name(), old.revision().add(BigInteger.ONE), old.stats(), old.level(),
+                old.experience(), old.unspentPoints(), old.health(), old.learned(), old.loadout(), cooldowns,
+                old.restrictedKills(), false, old.deathId(), old.diedAt());
+            repository.replace(saved, old.revision());
+            return new AbilityMutation(AbilityMutationStatus.APPLIED, Optional.of(saved));
+        });
+    }
+
+    public enum StatPurchaseStatus { APPLIED, STALE, NO_POINTS, UNAVAILABLE }
+    public record StatPurchase(StatPurchaseStatus status, Optional<CharacterRecord> record) { }
+
+    /** Persist one active-session stat purchase and its current native health as one revision. */
+    public CompletableFuture<StatPurchase> purchaseStat(UUID characterId, BigInteger expectedRevision, Stat stat,
+                                                         java.math.BigDecimal currentHealth,
+                                                         java.math.BigDecimal nativeLimit) {
+        Objects.requireNonNull(characterId);
+        Objects.requireNonNull(expectedRevision);
+        Objects.requireNonNull(stat);
+        Objects.requireNonNull(currentHealth);
+        Objects.requireNonNull(nativeLimit);
+        if (currentHealth.signum() < 0 || nativeLimit.signum() <= 0) {
+            throw new IllegalArgumentException("Invalid stat-purchase health bound");
+        }
+        return submit(() -> {
+            var found = repository.load(characterId);
+            if (found.isEmpty() || found.orElseThrow().dead()) {
+                return new StatPurchase(StatPurchaseStatus.UNAVAILABLE, Optional.empty());
+            }
+            var old = found.orElseThrow();
+            if (!old.revision().equals(expectedRevision)) {
+                return new StatPurchase(StatPurchaseStatus.STALE, Optional.of(old));
+            }
+            if (old.unspentPoints().signum() == 0) {
+                return new StatPurchase(StatPurchaseStatus.NO_POINTS, Optional.of(old));
+            }
+            var oldMaximum = old.maximumHealth().min(nativeLimit);
+            if (currentHealth.compareTo(oldMaximum) > 0) {
+                return new StatPurchase(StatPurchaseStatus.STALE, Optional.of(old));
+            }
+            var stats = new java.util.EnumMap<Stat, BigInteger>(Stat.class);
+            stats.putAll(old.stats());
+            stats.put(stat, stats.get(stat).add(BigInteger.ONE));
+            var rawMaximum = new java.math.BigDecimal(stats.get(Stat.CON).add(BigInteger.TEN));
+            var gain = rawMaximum.min(nativeLimit).subtract(oldMaximum);
+            var saved = new CharacterRecord(old.id(), old.name(), old.revision().add(BigInteger.ONE), stats,
+                old.level(), old.experience(), old.unspentPoints().subtract(BigInteger.ONE),
+                currentHealth.add(gain), old.learned(), old.loadout(), old.cooldowns(), old.restrictedKills(), false,
+                old.deathId(), old.diedAt());
+            repository.replace(saved, old.revision());
+            return new StatPurchase(StatPurchaseStatus.APPLIED, Optional.of(saved));
+        });
+    }
+
+    /** Session-owned remaining health; retain all other current fields and reject concurrent revision changes. */
+    public CompletableFuture<Optional<CharacterRecord>> saveHealth(UUID characterId, java.math.BigDecimal health,
+                                                                  java.math.BigDecimal nativeLimit) {
+        Objects.requireNonNull(characterId);
+        if (health.signum() < 0 || nativeLimit.signum() <= 0) throw new IllegalArgumentException("Invalid health bound");
+        return submit(() -> {
+            var found = repository.load(characterId);
+            if (found.isEmpty() || found.orElseThrow().dead()) return Optional.empty();
+            var old = found.orElseThrow();
+            var bounded = health.min(old.maximumHealth()).min(nativeLimit);
+            if (old.health().compareTo(bounded) == 0) return Optional.of(old);
+            var saved = new CharacterRecord(old.id(), old.name(), old.revision().add(BigInteger.ONE), old.stats(), old.level(),
+                old.experience(), old.unspentPoints(), bounded, old.learned(), old.loadout(), old.cooldowns(),
+                old.restrictedKills(), false, old.deathId(), old.diedAt());
+            repository.replace(saved, old.revision());
+            return Optional.of(saved);
+        });
+    }
+
+    /**
+     * One accepted defeat against the latest live record on this worker, including queued names.
+     * The repository's locked revision compare-and-replace prevents overwriting a concurrent
+     * external writer; a conflict fails rather than retrying an uncertain death or reviving it.
+     * Callers must retain their one-use session authority until the result resolves.
+     */
+    public CompletableFuture<Optional<CharacterRecord>> recordDeath(UUID characterId) {
+        return death(characterId, null);
+    }
+
+    public CompletableFuture<Optional<CharacterRecord>> recordDeath(UUID characterId, BigInteger expectedRevision) {
+        return death(characterId, Objects.requireNonNull(expectedRevision));
+    }
+
+    private CompletableFuture<Optional<CharacterRecord>> death(UUID characterId, BigInteger expectedRevision) {
+        Objects.requireNonNull(characterId);
         Instant diedAt = clock.instant();
+        UUID deathId = UUID.randomUUID();
         return submit(() -> {
             Optional<CharacterRecord> found = repository.load(characterId);
             if (found.isEmpty()) return Optional.empty();
             CharacterRecord old = found.orElseThrow();
-            if (old.dead() || !old.revision().equals(expectedRevision)) return Optional.empty();
+            if (old.dead() || expectedRevision != null && !old.revision().equals(expectedRevision)) return Optional.empty();
             var dead = new CharacterRecord(old.id(), old.name(), old.revision().add(BigInteger.ONE), old.stats(),
                 old.level(), old.experience(), old.unspentPoints(), java.math.BigDecimal.ZERO, old.learned(),
-                old.loadout(), old.cooldowns(), true, UUID.randomUUID(), diedAt);
+                old.loadout(), old.cooldowns(), old.restrictedKills(), true, deathId, diedAt);
             repository.replace(dead, old.revision());
             return Optional.of(dead);
         });
     }
 
     public CompletableFuture<Optional<CharacterRecord>> restoreDeathRecord(UUID characterId, UUID deathId) {
+        return restoreDeathRecord(characterId, deathId, null);
+    }
+
+    /** Native Revive supplies the current plugin-controlled health ceiling captured on the server thread. */
+    public CompletableFuture<Optional<CharacterRecord>> restoreDeathRecord(UUID characterId, UUID deathId,
+                                                                            java.math.BigDecimal nativeLimit) {
         Objects.requireNonNull(characterId);
         Objects.requireNonNull(deathId);
+        if (nativeLimit != null && nativeLimit.signum() <= 0) throw new IllegalArgumentException("Invalid revival health limit");
         Instant selectedAt = clock.instant();
         return submit(() -> {
             Optional<CharacterRecord> found = repository.load(characterId);
@@ -66,9 +507,10 @@ public final class CharacterStorage implements AutoCloseable {
             if (!deathId.equals(old.deathId()) || age.isNegative() || age.compareTo(Duration.ofHours(24)) >= 0) {
                 return Optional.empty();
             }
+            var health = nativeLimit == null ? old.maximumHealth() : old.maximumHealth().min(nativeLimit);
             var restored = new CharacterRecord(old.id(), old.name(), old.revision().add(BigInteger.ONE), old.stats(),
-                old.level(), old.experience(), old.unspentPoints(), old.maximumHealth(), old.learned(),
-                old.loadout(), old.cooldowns(), false, old.deathId(), old.diedAt());
+                old.level(), old.experience(), old.unspentPoints(), health, old.learned(), old.loadout(), old.cooldowns(),
+                old.restrictedKills(), false, old.deathId(), old.diedAt());
             repository.replace(restored, old.revision());
             return Optional.of(restored);
         });

src/main/java/games/dmg/fantasystick/persistence/CharacterYaml.java

@@ -46,6 +46,13 @@ final class CharacterYaml {
         record.cooldowns().entrySet().stream().sorted(Map.Entry.comparingByKey()).forEach(entry ->
             cooldowns.add(Map.of("ability", entry.getKey(), "ready-at", entry.getValue().toString())));
         root.put("cooldowns", cooldowns);
+        List<Map<String, String>> restrictedKills = new ArrayList<>();
+        record.restrictedKills().entrySet().stream().sorted(Map.Entry.comparingByKey()).forEach(entry -> {
+            var position = entry.getValue();
+            restrictedKills.add(Map.of("world", entry.getKey().toString(), "x", position.x().toString(),
+                "y", position.y().toString(), "z", position.z().toString()));
+        });
+        root.put("restricted-kills", restrictedKills);
         root.put("dead", record.dead());
         if (record.deathId() != null) {
             root.put("death-id", record.deathId().toString());
@@ -74,11 +81,19 @@ final class CharacterYaml {
                 throw new IllegalArgumentException("Duplicate cooldown");
             }
         }
+        Map<UUID, games.dmg.fantasystick.progression.CombatRewardRules.KillPosition> restrictedKills = new LinkedHashMap<>();
+        for (Object value : root.containsKey("restricted-kills") ? list(root.get("restricted-kills")) : List.of()) {
+            Map<?, ?> row = object(value);
+            UUID world = UUID.fromString(text(row.get("world")));
+            var position = new games.dmg.fantasystick.progression.CombatRewardRules.KillPosition(world,
+                new BigDecimal(text(row.get("x"))), new BigDecimal(text(row.get("y"))), new BigDecimal(text(row.get("z"))));
+            if (restrictedKills.putIfAbsent(world, position) != null) throw new IllegalArgumentException("Duplicate restricted-kill world");
+        }
         if (!(root.get("dead") instanceof Boolean dead)) throw new IllegalArgumentException("Missing dead flag");
         return new CharacterRecord(UUID.fromString(text(root.get("character-id"))), text(root.get("name")),
             number(root.get("revision")), stats, number(root.get("level")).intValueExact(),
             number(root.get("experience")), number(root.get("unspent-points")),
-            new BigDecimal(text(root.get("health"))), learned, strings(root.get("loadout")), cooldowns,
+            new BigDecimal(text(root.get("health"))), learned, strings(root.get("loadout")), cooldowns, restrictedKills,
             dead, root.containsKey("death-id") ? UUID.fromString(text(root.get("death-id"))) : null,
             root.containsKey("died-at") ? instant(root.get("died-at")) : null);
     }

src/main/java/games/dmg/fantasystick/persistence/EquipmentSessionStore.java

@@ -0,0 +1,382 @@
+package games.dmg.fantasystick.persistence;
+
+import java.io.IOException;
+import java.math.BigInteger;
+import java.nio.ByteBuffer;
+import java.nio.channels.FileChannel;
+import java.nio.channels.OverlappingFileLockException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.LinkOption;
+import java.nio.file.Path;
+import java.nio.file.StandardCopyOption;
+import java.nio.file.StandardOpenOption;
+import java.time.Clock;
+import java.time.Duration;
+import java.time.Instant;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.CompletionException;
+import java.util.concurrent.CompletionStage;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.RejectedExecutionException;
+import org.yaml.snakeyaml.LoaderOptions;
+import org.yaml.snakeyaml.Yaml;
+import org.yaml.snakeyaml.constructor.SafeConstructor;
+
+/**
+ * Player/session receipts, never an external copy of equipment or proof of restoration.
+ * All disk work is deferred. Coordination assumes cooperating writers, not adversarial
+ * replacement of directories. Forced atomic file replacement is not inventory/save atomicity
+ * or a guarantee of directory durability after power loss. Ambiguous receipts are retained.
+ */
+public final class EquipmentSessionStore implements AutoCloseable {
+    private static final int MAX_FILE_BYTES = 16_384;
+    private final Path directory;
+    private final Clock clock;
+    private final Replacement replacement;
+
+    @FunctionalInterface
+    interface Replacement { void move(Path source, Path target) throws IOException; }
+
+    private final ExecutorService worker = Executors.newSingleThreadExecutor(
+        task -> new Thread(task, "fantasy-equipment-session-persistence"));
+
+    public record Receipt(UUID sessionId, UUID characterId, Instant preparedAt, String previousGameMode, OrdinaryVitals ordinaryVitals) {
+        public Receipt(UUID sessionId, UUID characterId, Instant preparedAt) { this(sessionId, characterId, preparedAt, null, null); }
+        public Receipt(UUID sessionId, UUID characterId, Instant preparedAt, String previousGameMode) {
+            this(sessionId, characterId, preparedAt, previousGameMode, null);
+        }
+        public Receipt {
+            Objects.requireNonNull(sessionId);
+            Objects.requireNonNull(characterId);
+            timestamp(preparedAt);
+            if (previousGameMode != null && !Set.of("SURVIVAL", "CREATIVE", "ADVENTURE", "SPECTATOR").contains(previousGameMode)) {
+                throw new IllegalArgumentException("Invalid previous game mode");
+            }
+        }
+    }
+
+    public record Exit(UUID sessionId, UUID characterId, Instant exitedAt, Instant deadline) {
+        public Exit {
+            Objects.requireNonNull(sessionId);
+            Objects.requireNonNull(characterId);
+            timestamp(exitedAt);
+            timestamp(deadline);
+            if (deadline.isBefore(exitedAt)) throw new IllegalArgumentException("Deadline precedes exit");
+        }
+    }
+
+    public record State(UUID playerId, BigInteger revision, Receipt pending, Exit lastExit) {
+        public State {
+            Objects.requireNonNull(playerId);
+            Objects.requireNonNull(revision);
+            if (revision.signum() < 0) throw new IllegalArgumentException("Negative session revision");
+            if (pending != null && lastExit != null && pending.sessionId().equals(lastExit.sessionId())
+                    && !pending.characterId().equals(lastExit.characterId())) {
+                throw new IllegalArgumentException("Inconsistent session character");
+            }
+        }
+
+        /** Only a delay check; this does not authorize a sheet, equipment, or native state changes. */
+        public boolean canEnter(UUID character, Duration configuredDelay, Instant now) {
+            Objects.requireNonNull(character);
+            Objects.requireNonNull(configuredDelay);
+            Objects.requireNonNull(now);
+            if (configuredDelay.isNegative()) throw new IllegalArgumentException("Negative switch delay");
+            return configuredDelay.isZero() || lastExit == null || character.equals(lastExit.characterId())
+                || !now.isBefore(lastExit.deadline());
+        }
+    }
+
+    /** No filesystem access, directory creation or recovery occurs in the constructor. */
+    public EquipmentSessionStore(Path pluginDataDirectory, Clock clock) {
+        this(pluginDataDirectory, clock, (source, target) -> Files.move(source, target,
+            StandardCopyOption.ATOMIC_MOVE, StandardCopyOption.REPLACE_EXISTING));
+    }
+
+    // Narrow disk-boundary seam for deterministic acknowledgment/failure tests.
+    EquipmentSessionStore(Path pluginDataDirectory, Clock clock, Replacement replacement) {
+        directory = Objects.requireNonNull(pluginDataDirectory).resolve("sessions").toAbsolutePath();
+        this.clock = Objects.requireNonNull(clock);
+        this.replacement = Objects.requireNonNull(replacement);
+    }
+
+    public CompletionStage<Optional<State>> find(UUID player) {
+        Objects.requireNonNull(player);
+        return submit(() -> withLock(() -> load(player)));
+    }
+
+    public CompletionStage<State> prepare(UUID player, UUID session, UUID character) {
+        return prepare(player, session, character, null);
+    }
+
+    /** A receipt acknowledgment precedes mode/gear mutation; it is not proof either happened. */
+    public CompletionStage<State> prepare(UUID player, UUID session, UUID character, String previousGameMode) {
+        return prepare(player, session, character, previousGameMode, null);
+    }
+
+    public CompletionStage<State> prepare(UUID player, UUID session, UUID character, String previousGameMode, OrdinaryVitals ordinaryVitals) {
+        Objects.requireNonNull(player);
+        var receipt = new Receipt(session, character, clock.instant(), previousGameMode, ordinaryVitals);
+        return submit(() -> withLock(() -> {
+            var found = load(player);
+            if (found.isPresent()) {
+                var old = found.orElseThrow();
+                if (old.pending() != null) {
+                    if (session.equals(old.pending().sessionId()) && character.equals(old.pending().characterId())
+                            && Objects.equals(previousGameMode, old.pending().previousGameMode())
+                            && Objects.equals(ordinaryVitals, old.pending().ordinaryVitals())) {
+                        return old;
+                    }
+                    throw new IOException("Conflicting pending equipment session");
+                }
+                if (old.lastExit() != null && session.equals(old.lastExit().sessionId())) {
+                    throw new IOException("Exited session cannot be prepared again");
+                }
+                return write(new State(player, old.revision().add(BigInteger.ONE), receipt, old.lastExit()));
+            }
+            return write(new State(player, BigInteger.ZERO, receipt, null));
+        }));
+    }
+
+    /** Capture the actual exit request time, never queue completion time. The receipt remains pending. */
+    public CompletionStage<State> recordExit(UUID player, UUID session, Duration delay) {
+        Objects.requireNonNull(player);
+        Objects.requireNonNull(session);
+        Objects.requireNonNull(delay);
+        Instant exitedAt = clock.instant();
+        return submit(() -> {
+            if (delay.isNegative()) throw new IllegalArgumentException("Negative switch delay");
+            Instant deadline = exitedAt.plus(delay);
+            timestamp(exitedAt);
+            timestamp(deadline);
+            return withLock(() -> {
+                var old = load(player).orElseThrow(() -> new IOException("Equipment session not found"));
+                if (old.lastExit() != null && session.equals(old.lastExit().sessionId())) return old;
+                if (old.pending() == null || !session.equals(old.pending().sessionId())) {
+                    throw new IOException("Exit does not identify the prepared session");
+                }
+                var exit = new Exit(session, old.pending().characterId(), exitedAt, deadline);
+                return write(new State(player, old.revision().add(BigInteger.ONE), old.pending(), exit));
+            });
+        });
+    }
+
+    /** Atomically record a proven native restoration and clear only its matching receipt. */
+    public CompletionStage<State> completeExit(UUID player, UUID session, Duration delay) {
+        Objects.requireNonNull(player);
+        Objects.requireNonNull(session);
+        Objects.requireNonNull(delay);
+        Instant exitedAt = clock.instant();
+        return submit(() -> {
+            if (delay.isNegative()) throw new IllegalArgumentException("Negative switch delay");
+            Instant deadline = exitedAt.plus(delay);
+            timestamp(exitedAt);
+            timestamp(deadline);
+            return withLock(() -> {
+                var old = load(player).orElseThrow(() -> new IOException("Equipment session not found"));
+                boolean recorded = old.lastExit() != null && session.equals(old.lastExit().sessionId());
+                boolean matching = old.pending() != null && session.equals(old.pending().sessionId());
+                if (recorded && !matching) return old; // Never clear a newer pending receipt.
+                if (!matching) throw new IOException("Exit does not identify the prepared session");
+                var exit = recorded ? old.lastExit()
+                    : new Exit(session, old.pending().characterId(), exitedAt, deadline);
+                return write(new State(player, old.revision().add(BigInteger.ONE), null, exit));
+            });
+        });
+    }
+
+    /** Caller must prove never-packed or actually restored; absent items are not such proof. */
+    public CompletionStage<State> clearReceipt(UUID player, UUID session) {
+        Objects.requireNonNull(player);
+        Objects.requireNonNull(session);
+        return submit(() -> withLock(() -> {
+            var old = load(player).orElseThrow(() -> new IOException("Equipment session not found"));
+            if (old.pending() == null) return old;
+            if (!session.equals(old.pending().sessionId())) throw new IOException("Receipt session mismatch");
+            return write(new State(player, old.revision().add(BigInteger.ONE), null, old.lastExit()));
+        }));
+    }
+
+    @FunctionalInterface
+    private interface DiskOperation<T> { T run() throws IOException; }
+
+    private <T> CompletionStage<T> submit(DiskOperation<T> operation) {
+        try {
+            return CompletableFuture.supplyAsync(() -> {
+                try {
+                    return operation.run();
+                } catch (IOException exception) {
+                    throw new CompletionException(exception);
+                }
+            }, worker).minimalCompletionStage();
+        } catch (RejectedExecutionException exception) {
+            return CompletableFuture.failedStage(exception);
+        }
+    }
+
+    private <T> T withLock(DiskOperation<T> operation) throws IOException {
+        try {
+            Files.createDirectories(directory);
+            if (!Files.isDirectory(directory, LinkOption.NOFOLLOW_LINKS)) {
+                throw new IOException("Unsafe session directory");
+            }
+            Path lockPath = directory.resolve(".sessions.lock");
+            if (Files.exists(lockPath, LinkOption.NOFOLLOW_LINKS)
+                    && !Files.isRegularFile(lockPath, LinkOption.NOFOLLOW_LINKS)) {
+                throw new IOException("Unsafe session coordination file");
+            }
+            try (var channel = FileChannel.open(lockPath, StandardOpenOption.CREATE, StandardOpenOption.WRITE,
+                    LinkOption.NOFOLLOW_LINKS);
+                 var lock = channel.tryLock()) {
+                if (lock == null) throw new IOException("Equipment session busy; retry the operation");
+                return operation.run();
+            }
+        } catch (OverlappingFileLockException exception) {
+            throw new IOException("Equipment session busy; retry the operation");
+        } catch (IOException exception) {
+            // Filesystem paths and parser data must not escape through diagnostics/cause chains.
+            throw new IOException("Equipment session IO refused or failed; original state must be inspected");
+        }
+    }
+
+    private Optional<State> load(UUID player) throws IOException {
+        Path path = file(player);
+        if (Files.notExists(path, LinkOption.NOFOLLOW_LINKS)) return Optional.empty();
+        if (!Files.isRegularFile(path, LinkOption.NOFOLLOW_LINKS)) throw new IOException("Unsafe session record");
+        try (var input = Files.newInputStream(path, StandardOpenOption.READ, LinkOption.NOFOLLOW_LINKS)) {
+            byte[] bytes = input.readNBytes(MAX_FILE_BYTES + 1);
+            if (bytes.length > MAX_FILE_BYTES) throw new IOException("Session record exceeds size limit");
+            String text = StandardCharsets.UTF_8.newDecoder().decode(ByteBuffer.wrap(bytes)).toString();
+            State state = decode(text);
+            if (!state.playerId().equals(player)) throw new IllegalArgumentException("Session player mismatch");
+            return Optional.of(state);
+        } catch (RuntimeException exception) {
+            throw new IOException("Invalid equipment session YAML");
+        }
+    }
+
+    private State write(State state) throws IOException {
+        byte[] bytes = encode(state).getBytes(StandardCharsets.UTF_8);
+        if (bytes.length > MAX_FILE_BYTES) throw new IOException("Session record exceeds size limit");
+        Path temporary = Files.createTempFile(directory, ".session-", ".tmp");
+        try {
+            try (var output = FileChannel.open(temporary, StandardOpenOption.WRITE, LinkOption.NOFOLLOW_LINKS)) {
+                ByteBuffer buffer = ByteBuffer.wrap(bytes);
+                while (buffer.hasRemaining()) output.write(buffer);
+                output.force(true);
+            }
+            // Do not fall back to truncating or non-atomic replacement of an existing record.
+            replacement.move(temporary, file(state.playerId()));
+            return state;
+        } finally {
+            Files.deleteIfExists(temporary);
+        }
+    }
+
+    private Path file(UUID player) { return directory.resolve(player + ".yml"); }
+
+    private static Yaml yaml() {
+        var options = new LoaderOptions();
+        options.setAllowDuplicateKeys(false);
+        options.setMaxAliasesForCollections(0);
+        options.setNestingDepthLimit(8);
+        options.setCodePointLimit(MAX_FILE_BYTES);
+        return new Yaml(new SafeConstructor(options));
+    }
+
+    private static String encode(State state) {
+        Map<String, Object> root = new LinkedHashMap<>();
+        root.put("schema-version", 1);
+        root.put("player-id", state.playerId().toString());
+        root.put("revision", state.revision().toString());
+        if (state.pending() != null) {
+            var receipt = state.pending();
+            var pending = new LinkedHashMap<String, Object>();
+            pending.put("session-id", receipt.sessionId().toString());
+            pending.put("character-id", receipt.characterId().toString());
+            pending.put("prepared-at", receipt.preparedAt().toString());
+            if (receipt.previousGameMode() != null) pending.put("previous-game-mode", receipt.previousGameMode());
+            if (receipt.ordinaryVitals() != null) pending.put("ordinary-vitals", receipt.ordinaryVitals().encode());
+            root.put("pending", pending);
+        }
+        if (state.lastExit() != null) {
+            var exit = state.lastExit();
+            root.put("last-exit", Map.of("session-id", exit.sessionId().toString(),
+                "character-id", exit.characterId().toString(), "exited-at", exit.exitedAt().toString(),
+                "deadline", exit.deadline().toString()));
+        }
+        return yaml().dump(root);
+    }
+
+    private static State decode(String input) {
+        Map<?, ?> root = mapping(yaml().load(input), Set.of("schema-version", "player-id", "revision"),
+            Set.of("schema-version", "player-id", "revision", "pending", "last-exit"));
+        if (!Integer.valueOf(1).equals(root.get("schema-version"))) {
+            throw new IllegalArgumentException("Unsupported session schema");
+        }
+        Receipt pending = null;
+        Exit exit = null;
+        if (root.containsKey("pending")) {
+            var keys = Set.of("session-id", "character-id", "prepared-at");
+            var row = mapping(root.get("pending"), keys, Set.of("session-id", "character-id", "prepared-at", "previous-game-mode", "ordinary-vitals"));
+            String previousMode = null;
+            if (row.containsKey("previous-game-mode")) {
+                if (!(row.get("previous-game-mode") instanceof String value)) throw new IllegalArgumentException("Invalid previous mode");
+                previousMode = value;
+            }
+            pending = new Receipt(id(row.get("session-id")), id(row.get("character-id")), instant(row.get("prepared-at")), previousMode,
+                row.containsKey("ordinary-vitals") ? OrdinaryVitals.decode(text(row.get("ordinary-vitals"))) : null);
+        }
+        if (root.containsKey("last-exit")) {
+            var keys = Set.of("session-id", "character-id", "exited-at", "deadline");
+            var row = mapping(root.get("last-exit"), keys, keys);
+            exit = new Exit(id(row.get("session-id")), id(row.get("character-id")),
+                instant(row.get("exited-at")), instant(row.get("deadline")));
+        }
+        String revision = text(root.get("revision"));
+        if (!revision.matches("0|[1-9][0-9]*")) throw new IllegalArgumentException("Invalid revision");
+        return new State(id(root.get("player-id")), new BigInteger(revision), pending, exit);
+    }
+
+    private static Map<?, ?> mapping(Object value, Set<String> required, Set<String> allowed) {
+        if (value instanceof Map<?, ?> map && map.keySet().containsAll(required) && allowed.containsAll(map.keySet())) {
+            return map;
+        }
+        throw new IllegalArgumentException("Invalid session mapping");
+    }
+
+    private static String text(Object value) {
+        if (value instanceof String string) return string;
+        throw new IllegalArgumentException("Expected session string");
+    }
+
+    private static UUID id(Object value) {
+        String string = text(value);
+        UUID id = UUID.fromString(string);
+        if (!id.toString().equals(string)) throw new IllegalArgumentException("Noncanonical session UUID");
+        return id;
+    }
+
+    private static Instant instant(Object value) {
+        String string = text(value);
+        if (!string.matches("[0-9]{4}-[0-9]{2}-[0-9]{2}T(?:[01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9](?:\\.[0-9]{1,9})?Z")) {
+            throw new IllegalArgumentException("Expected UTC session timestamp");
+        }
+        return Instant.parse(string);
+    }
+
+    private static void timestamp(Instant value) {
+        instant(Objects.requireNonNull(value).toString());
+    }
+
+    /** Nonblocking shutdown: accepted work drains; no recovery sweep, deletion or replay. */
+    @Override public void close() { worker.shutdown(); }
+}

src/main/java/games/dmg/fantasystick/persistence/OrdinaryVitals.java

@@ -0,0 +1,27 @@
+package games.dmg.fantasystick.persistence;
+
+/** Holder-owned ordinary state, never transferable character progress or an attribute snapshot. */
+public record OrdinaryVitals(double health, int food, float saturation, float exhaustion,
+                             boolean scaled, double scale) {
+    public OrdinaryVitals {
+        if (!Double.isFinite(health) || health < 0 || food < 0 || food > 20
+                || !Float.isFinite(saturation) || saturation < 0 || !Float.isFinite(exhaustion) || exhaustion < 0
+                || !Double.isFinite(scale) || scale <= 0) throw new IllegalArgumentException("Invalid ordinary vitals");
+    }
+
+    public String encode() {
+        return health + ";" + food + ";" + saturation + ";" + exhaustion + ";" + scaled + ";" + scale;
+    }
+
+    public static OrdinaryVitals decode(String encoded) {
+        if (encoded.length() > 256) throw new IllegalArgumentException("Oversized ordinary vitals");
+        String[] fields = encoded.split(";", -1);
+        if (fields.length != 6 || !fields[4].equals("true") && !fields[4].equals("false")) {
+            throw new IllegalArgumentException("Invalid ordinary vitals fields");
+        }
+        var value = new OrdinaryVitals(Double.parseDouble(fields[0]), Integer.parseInt(fields[1]),
+            Float.parseFloat(fields[2]), Float.parseFloat(fields[3]), Boolean.parseBoolean(fields[4]), Double.parseDouble(fields[5]));
+        if (!encoded.equals(value.encode())) throw new IllegalArgumentException("Noncanonical ordinary vitals");
+        return value;
+    }
+}

src/main/java/games/dmg/fantasystick/persistence/RevivalStore.java

@@ -0,0 +1,159 @@
+package games.dmg.fantasystick.persistence;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.LinkOption;
+import java.nio.file.Path;
+import java.nio.file.StandardCopyOption;
+import java.nio.file.StandardOpenOption;
+import java.time.Instant;
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.CompletionException;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.RejectedExecutionException;
+import org.yaml.snakeyaml.LoaderOptions;
+import org.yaml.snakeyaml.Yaml;
+import org.yaml.snakeyaml.constructor.SafeConstructor;
+
+/** Feature-scoped Revive interruption proof; never authority to guess or mint an item. */
+public final class RevivalStore implements AutoCloseable {
+    private static final int MAX_FILE_BYTES = 32_768;
+    private static final int MAX_FILES = 4096;
+    private static final Set<String> KEYS = Set.of("schema-version", "reservation-id", "caster-character-id",
+        "target-player-id", "character-id", "death-id", "created-at", "source-slot", "source-amount", "destination-slot");
+    public record Reservation(UUID id, UUID casterCharacter, UUID targetPlayer, UUID character, UUID death,
+                              Instant createdAt, int sourceSlot, int sourceAmount, int destinationSlot) {
+        public Reservation {
+            Objects.requireNonNull(id); Objects.requireNonNull(casterCharacter); Objects.requireNonNull(targetPlayer);
+            Objects.requireNonNull(character); Objects.requireNonNull(death); Objects.requireNonNull(createdAt);
+            if (createdAt.getNano() != 0 || sourceSlot < 0 || sourceSlot > 40 || sourceSlot > 35 && sourceSlot != 40
+                    || sourceAmount < 1 || sourceAmount > 99 || destinationSlot < -1 || destinationSlot > 40
+                    || destinationSlot > 35 && destinationSlot != 40 || destinationSlot == sourceSlot) {
+                throw new IllegalArgumentException("Invalid revival reservation");
+            }
+        }
+    }
+
+    private final Path directory;
+    private final ExecutorService worker = Executors.newSingleThreadExecutor(
+        task -> new Thread(task, "fantasy-revival-persistence"));
+
+    public RevivalStore(Path pluginDataDirectory) {
+        directory = Objects.requireNonNull(pluginDataDirectory).resolve("revivals").toAbsolutePath();
+    }
+
+    public CompletableFuture<Optional<Reservation>> reserve(Reservation reservation) {
+        Objects.requireNonNull(reservation);
+        return submit(() -> {
+            Path file = file(reservation.character());
+            if (Files.exists(file, LinkOption.NOFOLLOW_LINKS)) return Optional.empty();
+            safeDirectory();
+            Path temporary = directory.resolve("." + reservation.character() + "." + UUID.randomUUID() + ".tmp");
+            try {
+                Files.writeString(temporary, encode(reservation), StandardCharsets.UTF_8,
+                    StandardOpenOption.CREATE_NEW, StandardOpenOption.WRITE);
+                Files.move(temporary, file, StandardCopyOption.ATOMIC_MOVE);
+            } finally { Files.deleteIfExists(temporary); }
+            return Optional.of(reservation);
+        });
+    }
+
+    public CompletableFuture<Optional<Reservation>> find(UUID character) {
+        Objects.requireNonNull(character);
+        return submit(() -> load(file(character)));
+    }
+
+    public CompletableFuture<List<Reservation>> target(UUID player) {
+        Objects.requireNonNull(player);
+        return submit(() -> {
+            if (!Files.exists(directory, LinkOption.NOFOLLOW_LINKS)) return List.of();
+            if (Files.isSymbolicLink(directory) || !Files.isDirectory(directory, LinkOption.NOFOLLOW_LINKS)) {
+                throw new IOException("Unsafe revival directory");
+            }
+            var result = new ArrayList<Reservation>();
+            try (var files = Files.list(directory)) {
+                for (var path : files.limit(MAX_FILES + 1).toList()) {
+                    if (result.size() >= MAX_FILES) throw new IOException("Too many revival reservations");
+                    if (!path.getFileName().toString().endsWith(".yml")) continue;
+                    var reservation = load(path).orElseThrow(() -> new IOException("Missing revival reservation"));
+                    if (reservation.targetPlayer().equals(player)) result.add(reservation);
+                }
+            }
+            return List.copyOf(result);
+        });
+    }
+
+    public CompletableFuture<Boolean> clear(UUID character, UUID reservation) {
+        Objects.requireNonNull(character); Objects.requireNonNull(reservation);
+        return submit(() -> {
+            var found = load(file(character));
+            if (found.isEmpty() || !found.orElseThrow().id().equals(reservation)) return false;
+            return Files.deleteIfExists(file(character));
+        });
+    }
+
+    private void safeDirectory() throws IOException {
+        if (Files.exists(directory, LinkOption.NOFOLLOW_LINKS)) {
+            if (Files.isSymbolicLink(directory) || !Files.isDirectory(directory, LinkOption.NOFOLLOW_LINKS)) {
+                throw new IOException("Unsafe revival directory");
+            }
+        } else Files.createDirectories(directory);
+    }
+
+    private Path file(UUID character) { return directory.resolve(character + ".yml"); }
+
+    private Optional<Reservation> load(Path file) throws IOException {
+        if (!Files.exists(file, LinkOption.NOFOLLOW_LINKS)) return Optional.empty();
+        if (Files.isSymbolicLink(file) || !Files.isRegularFile(file, LinkOption.NOFOLLOW_LINKS)
+                || Files.size(file) > MAX_FILE_BYTES) throw new IOException("Unsafe revival reservation");
+        Object decoded;
+        try {
+            var options = new LoaderOptions(); options.setAllowDuplicateKeys(false); options.setMaxAliasesForCollections(0);
+            decoded = new Yaml(new SafeConstructor(options)).load(Files.readString(file, StandardCharsets.UTF_8));
+        } catch (RuntimeException invalid) { throw new IOException("Invalid revival reservation", invalid); }
+        if (!(decoded instanceof Map<?, ?> raw) || !raw.keySet().equals(KEYS)) throw new IOException("Invalid revival reservation keys");
+        try {
+            if (!"1".equals(text(raw, "schema-version"))) throw new IllegalArgumentException("schema");
+            var value = new Reservation(uuid(raw, "reservation-id"), uuid(raw, "caster-character-id"),
+                uuid(raw, "target-player-id"), uuid(raw, "character-id"), uuid(raw, "death-id"),
+                Instant.parse(text(raw, "created-at")), integer(raw, "source-slot"), integer(raw, "source-amount"),
+                integer(raw, "destination-slot"));
+            if (!file.getFileName().toString().equals(value.character() + ".yml")) throw new IllegalArgumentException("identity");
+            return Optional.of(value);
+        } catch (RuntimeException invalid) { throw new IOException("Invalid revival reservation", invalid); }
+    }
+
+    private static String encode(Reservation value) {
+        var map = new LinkedHashMap<String, Object>();
+        map.put("schema-version", "1"); map.put("reservation-id", value.id().toString());
+        map.put("caster-character-id", value.casterCharacter().toString()); map.put("target-player-id", value.targetPlayer().toString());
+        map.put("character-id", value.character().toString()); map.put("death-id", value.death().toString());
+        map.put("created-at", value.createdAt().toString()); map.put("source-slot", Integer.toString(value.sourceSlot()));
+        map.put("source-amount", Integer.toString(value.sourceAmount())); map.put("destination-slot", Integer.toString(value.destinationSlot()));
+        return new Yaml().dump(map);
+    }
+
+    private static String text(Map<?, ?> map, String key) {
+        Object value = map.get(key); if (!(value instanceof String text) || text.isBlank()) throw new IllegalArgumentException(key); return text;
+    }
+    private static UUID uuid(Map<?, ?> map, String key) { var value = UUID.fromString(text(map, key)); if (!value.toString().equals(text(map, key))) throw new IllegalArgumentException(key); return value; }
+    private static int integer(Map<?, ?> map, String key) { return Integer.parseInt(text(map, key)); }
+
+    @FunctionalInterface private interface Work<T> { T run() throws IOException; }
+    private <T> CompletableFuture<T> submit(Work<T> work) {
+        try {
+            return CompletableFuture.supplyAsync(() -> { try { return work.run(); } catch (IOException error) { throw new CompletionException(error); } }, worker);
+        } catch (RejectedExecutionException rejected) { return CompletableFuture.failedFuture(rejected); }
+    }
+    @Override public void close() { worker.shutdown(); }
+}

src/main/java/games/dmg/fantasystick/persistence/YamlCharacterRepository.java

@@ -11,6 +11,8 @@ import java.nio.file.LinkOption;
 import java.nio.file.Path;
 import java.nio.file.StandardCopyOption;
 import java.nio.file.StandardOpenOption;
+import java.nio.file.attribute.BasicFileAttributes;
+import java.util.Arrays;
 import java.util.Objects;
 import java.util.Optional;
 import java.util.UUID;
@@ -37,26 +39,70 @@ public final class YamlCharacterRepository {
     }
 
     public void create(CharacterRecord character) throws IOException {
+        createTracked(character);
+    }
+
+    /** Process-local proof; never reconstructed from a revision-zero file after restart. */
+    static final class Creation {
+        final CharacterRecord record;
+        private final BasicFileAttributes attributes;
+        private final byte[] bytes;
+
+        private Creation(CharacterRecord record, BasicFileAttributes attributes, byte[] bytes) {
+            this.record = record;
+            this.attributes = attributes;
+            this.bytes = bytes;
+        }
+    }
+
+    Creation createTracked(CharacterRecord character) throws IOException {
         if (character.revision().signum() != 0) throw new IOException("New character revision must be zero");
-        withLock(character.id(), () -> {
+        Creation[] created = new Creation[1];
+        withLock(() -> {
             if (Files.exists(file(character.id()), LinkOption.NOFOLLOW_LINKS)) {
                 throw new IOException("Character already exists: " + character.id());
             }
-            write(character);
+            created[0] = write(character);
         });
+        return created[0];
     }
 
     public void replace(CharacterRecord character, BigInteger expectedRevision) throws IOException {
         if (!character.revision().equals(expectedRevision.add(BigInteger.ONE))) {
             throw new IOException("Character update must advance exactly one revision");
         }
-        withLock(character.id(), () -> {
+        withLock(() -> {
             CharacterRecord current = load(character.id()).orElseThrow(() -> new IOException("Character not found"));
             if (!current.revision().equals(expectedRevision)) throw new IOException("Stale character revision");
             write(character);
         });
     }
 
+    /** Only the in-memory creator of a never-issued batch may request this cleanup. */
+    boolean discardUnissued(Creation created) throws IOException {
+        boolean[] removed = {false};
+        withLock(() -> {
+            var path = file(created.record.id());
+            if (Files.notExists(path, LinkOption.NOFOLLOW_LINKS)) {
+                removed[0] = true;
+                return;
+            }
+            var current = Files.readAttributes(path, BasicFileAttributes.class, LinkOption.NOFOLLOW_LINKS);
+            var expected = created.attributes;
+            if (!current.isRegularFile() || expected.fileKey() == null
+                    || !expected.fileKey().equals(current.fileKey())
+                    || !expected.creationTime().equals(current.creationTime())
+                    || !expected.lastModifiedTime().equals(current.lastModifiedTime())
+                    || current.size() != created.bytes.length) return;
+            try (var input = Files.newInputStream(path, StandardOpenOption.READ, LinkOption.NOFOLLOW_LINKS)) {
+                if (!Arrays.equals(created.bytes, input.readNBytes(created.bytes.length + 1))) return;
+            }
+            Files.delete(path);
+            removed[0] = true;
+        });
+        return removed[0];
+    }
+
     public Optional<CharacterRecord> load(UUID id) throws IOException {
         Path file = file(id);
         if (Files.notExists(file, LinkOption.NOFOLLOW_LINKS)) return Optional.empty();
@@ -73,7 +119,7 @@ public final class YamlCharacterRepository {
         }
     }
 
-    private void write(CharacterRecord character) throws IOException {
+    private Creation write(CharacterRecord character) throws IOException {
         byte[] bytes = CharacterYaml.encode(character).getBytes(StandardCharsets.UTF_8);
         if (bytes.length > MAX_FILE_BYTES) throw new IOException("Character YAML exceeds the safe file-size limit");
         Path temporary = Files.createTempFile(directory, ".character-", ".tmp");
@@ -83,16 +129,19 @@ public final class YamlCharacterRepository {
                 while (buffer.hasRemaining()) output.write(buffer);
                 output.force(true);
             }
+            var attributes = Files.readAttributes(temporary, BasicFileAttributes.class, LinkOption.NOFOLLOW_LINKS);
             // Never fall back to an in-place, partially written character record.
             replacement.move(temporary, file(character.id()));
+            return new Creation(character, attributes, bytes);
         } finally {
             Files.deleteIfExists(temporary);
         }
     }
 
-    private void withLock(UUID id, Operation operation) throws IOException {
+    /** Bounded coordination for all mutations; never mix with older per-ID writers in this directory. */
+    private void withLock(Operation operation) throws IOException {
         Files.createDirectories(directory);
-        Path lockPath = directory.resolve(id + ".lock");
+        Path lockPath = directory.resolve(".records.lock");
         try (var channel = FileChannel.open(lockPath, StandardOpenOption.CREATE, StandardOpenOption.WRITE,
                 LinkOption.NOFOLLOW_LINKS);
              var lock = channel.tryLock()) {

src/main/java/games/dmg/fantasystick/presentation/CharacterChatNames.java

@@ -0,0 +1,23 @@
+package games.dmg.fantasystick.presentation;
+
+import io.papermc.paper.event.player.AsyncChatEvent;
+import java.util.UUID;
+import java.util.function.Function;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+
+/** Substitutes only the renderer's sender-name argument; signed body and delivery stay native. */
+public final class CharacterChatNames implements Listener {
+    private final Function<UUID, String> names;
+    public CharacterChatNames(Function<UUID, String> names) { this.names = names; }
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void onChat(AsyncChatEvent event) {
+        if (event.isCancelled()) return;
+        String name = names.apply(event.getPlayer().getUniqueId());
+        if (name == null) return;
+        var literal = net.kyori.adventure.text.Component.text(name);
+        var ordinary = event.renderer();
+        event.renderer((source, ignoredName, message, viewer) -> ordinary.render(source, literal, message, viewer));
+    }
+}

src/main/java/games/dmg/fantasystick/presentation/CharacterPresentation.java

@@ -0,0 +1,95 @@
+package games.dmg.fantasystick.presentation;
+
+import games.dmg.fantasystick.persistence.CharacterRecord;
+import java.math.BigInteger;
+import java.util.Map;
+import java.util.UUID;
+import java.util.function.Consumer;
+import java.util.function.BooleanSupplier;
+import org.bukkit.entity.Player;
+
+/** Immutable session decisions shared by chat/packet threads; native output stays on the server thread. */
+public final class CharacterPresentation implements SessionPresentation, AutoCloseable {
+    public record View(UUID holder, UUID session, UUID character, BigInteger revision, String name) { }
+    public interface Output extends AutoCloseable {
+        void show(Player player, View view);
+        void rename(View view);
+        void clear(View view);
+        @Override void close();
+    }
+    private final Output output;
+    private final Consumer<Runnable> nextTick;
+    private final BooleanSupplier mainThread;
+    private final Consumer<Throwable> failures;
+    private volatile Map<UUID, View> views = Map.of();
+    private boolean closed;
+    private java.util.function.Function<UUID, java.util.concurrent.CompletionStage<java.util.Optional<CharacterRecord>>> currentRecord =
+        ignored -> java.util.concurrent.CompletableFuture.completedFuture(java.util.Optional.empty());
+    public CharacterPresentation(Output output, Consumer<Runnable> nextTick, BooleanSupplier mainThread, Consumer<Throwable> failures) {
+        this.output = output; this.nextTick = nextTick; this.mainThread = mainThread; this.failures = failures;
+    }
+    public CharacterPresentation(Output output, Consumer<Runnable> nextTick, BooleanSupplier mainThread, Consumer<Throwable> failures,
+            java.util.function.Function<UUID, java.util.concurrent.CompletionStage<java.util.Optional<CharacterRecord>>> currentRecord) {
+        this(output, nextTick, mainThread, failures);
+        this.currentRecord = java.util.Objects.requireNonNull(currentRecord);
+    }
+    public Map<UUID, View> snapshot() { return views; }
+    public String name(UUID holder) { var view = views.get(holder); return view == null ? null : view.name(); }
+    @Override public synchronized void activate(Player player, UUID session, CharacterRecord record) {
+        if (closed) return;
+        UUID holder = player.getUniqueId();
+        var previous = views.get(holder);
+        if (previous != null) withdraw(holder, previous.session());
+        var view = new View(holder, session, record.id(), record.revision(), record.name());
+        put(view);
+        safely(() -> output.show(player, view));
+        if (!closed && view.equals(views.get(holder))) safely(() -> currentRecord.apply(record.id()).whenComplete((saved, failure) -> {
+            if (failure != null) { safely(() -> { throw new java.util.concurrent.CompletionException(failure); }); return; }
+            saved.ifPresent(fresh -> acknowledge(view, fresh));
+        }));
+    }
+    @Override public synchronized void withdraw(UUID player, UUID session) {
+        var view = views.get(player);
+        if (view == null || !view.session().equals(session)) return;
+        var copy = new java.util.HashMap<>(views); copy.remove(player); views = Map.copyOf(copy);
+        // Invalidate synchronously even on a worker failure; never access Bukkit on that worker.
+        if (mainThread.getAsBoolean()) safely(() -> output.clear(view));
+        else safely(() -> nextTick.accept(() -> safely(() -> output.clear(view))));
+    }
+    /** File acknowledgment, not the physical sheet name. Safe to call from the persistence worker. */
+    public void acknowledged(CharacterRecord record) {
+        // Capture lifetime tokens now. A late callback cannot name a replacement holder/session.
+        for (var view : views.values()) acknowledge(view, record);
+    }
+    private void acknowledge(View target, CharacterRecord record) {
+        if (!newer(target, record)) return;
+        safely(() -> nextTick.accept(() -> {
+            synchronized (CharacterPresentation.this) {
+                if (closed || !newer(target, record)) return;
+                var updated = new View(target.holder(), target.session(), target.character(), record.revision(), record.name());
+                put(updated);
+                safely(() -> output.rename(updated));
+            }
+        }));
+    }
+    private boolean newer(View target, CharacterRecord record) {
+        var current = views.get(target.holder());
+        return current != null && current.session().equals(target.session()) && record.id().equals(current.character())
+            && !record.dead() && record.revision().compareTo(current.revision()) > 0;
+    }
+    private void put(View view) {
+        var copy = new java.util.HashMap<>(views); copy.put(view.holder(), view); views = Map.copyOf(copy);
+    }
+    private void safely(Runnable action) {
+        try { action.run(); }
+        catch (RuntimeException | LinkageError failure) {
+            try { failures.accept(failure); } catch (RuntimeException | LinkageError ignored) { /* Cleanup must continue. */ }
+        }
+    }
+    @Override public synchronized void close() {
+        if (closed) return;
+        closed = true;
+        for (var view : java.util.List.copyOf(views.values())) withdraw(view.holder(), view.session());
+        safely(output::close);
+    }
+}

src/main/java/games/dmg/fantasystick/presentation/NativePresentationPackets.java

@@ -0,0 +1,191 @@
+package games.dmg.fantasystick.presentation;
+
+import java.util.ArrayList;
+import java.util.EnumSet;
+import java.util.List;
+import java.util.Set;
+import java.util.UUID;
+import net.minecraft.network.chat.Component;
+import net.minecraft.network.protocol.game.ClientboundAddEntityPacket;
+import net.minecraft.network.protocol.game.ClientboundPlayerInfoUpdatePacket;
+import net.minecraft.network.protocol.game.ClientboundPlayerInfoUpdatePacket.Action;
+import net.minecraft.network.protocol.game.ClientboundPlayerInfoUpdatePacket.Entry;
+import net.minecraft.network.protocol.game.ClientboundRemoveEntitiesPacket;
+import net.minecraft.network.protocol.game.ClientboundSetEntityDataPacket;
+import net.minecraft.network.protocol.game.ClientboundTeleportEntityPacket;
+import net.minecraft.network.protocol.game.ClientboundUpdateAttributesPacket;
+import net.minecraft.network.protocol.game.ClientboundUpdateAttributesPacket.AttributeSnapshot;
+import net.minecraft.server.level.ServerPlayer;
+import net.minecraft.world.entity.Display.BillboardConstraints;
+import net.minecraft.world.entity.Display.TextDisplay;
+import net.minecraft.world.entity.EntityTypes;
+import net.minecraft.world.entity.PositionMoveRotation;
+import net.minecraft.world.entity.ai.attributes.Attributes;
+import net.minecraft.world.level.GameType;
+import net.minecraft.world.phys.Vec3;
+
+/**
+ * Display-only codec pinned to Purpur 26.2 build 2618. No packet delivery, world insertion,
+ * profile/team changes, or authoritative player mutations belong here.
+ *
+ * <p>Player reads and detached-label creation/updates belong on the server thread. Pure
+ * packet projections accept already-captured session identity/text; the caller owns visibility,
+ * per-viewer range, lifecycle checks and removing each viewer's client-only labels.
+ */
+public final class NativePresentationPackets {
+    private NativePresentationPackets() { }
+
+    /**
+     * Replace only the selected UUID's display component when its action is already present.
+     * Preserve all other entry fields and the exact action set, including mixed ADD packets.
+     * ADD without UPDATE_DISPLAY_NAME needs a separate targeted update after acceptance.
+     */
+    public static ClientboundPlayerInfoUpdatePacket projectPlayerInfo(
+            ClientboundPlayerInfoUpdatePacket packet, UUID activePlayer, String name) {
+        var actions = packet.actions();
+        if (!actions.contains(Action.UPDATE_DISPLAY_NAME)) {
+            return packet;
+        }
+        var entries = new ArrayList<Entry>(packet.entries().size());
+        boolean changed = false;
+        for (var entry : packet.entries()) {
+            if (entry.profileId().equals(activePlayer)) {
+                entries.add(new Entry(entry.profileId(), entry.profile(), entry.listed(), entry.latency(),
+                    entry.gameMode(), literal(name), entry.showHat(), entry.listOrder(), entry.chatSession()));
+                changed = true;
+            } else {
+                entries.add(entry);
+            }
+        }
+        if (!changed) { return packet; }
+        return new ClientboundPlayerInfoUpdatePacket(EnumSet.copyOf(actions), entries);
+    }
+
+    /**
+     * Replace an existing NAME_TAG_DISTANCE snapshot with base zero/no modifiers, only for
+     * the selected entity. Do not inject absent attributes; use suppressNameTag on activation.
+     */
+    public static ClientboundUpdateAttributesPacket projectAttributes(
+            ClientboundUpdateAttributesPacket packet, int activeEntityId) {
+        if (packet.getEntityId() != activeEntityId || packet.getValues().stream()
+                .noneMatch(value -> value.attribute().equals(Attributes.NAME_TAG_DISTANCE))) {
+            return packet;
+        }
+        var projected = new ClientboundUpdateAttributesPacket(activeEntityId, List.of());
+        for (var value : packet.getValues()) {
+            projected.getValues().add(value.attribute().equals(Attributes.NAME_TAG_DISTANCE)
+                ? new AttributeSnapshot(Attributes.NAME_TAG_DISTANCE, 0, List.of()) : value);
+        }
+        return projected;
+    }
+
+    /** One client-only distance snapshot; never changes the server's attribute instance. */
+    public static ClientboundUpdateAttributesPacket suppressNameTag(int entityId) {
+        var packet = new ClientboundUpdateAttributesPacket(entityId, List.of());
+        packet.getValues().add(new AttributeSnapshot(Attributes.NAME_TAG_DISTANCE, 0, List.of()));
+        return packet;
+    }
+
+    /** Snapshot the current authoritative distance base and all modifiers, not an old default. */
+    public static ClientboundUpdateAttributesPacket restoreNameTag(ServerPlayer player) {
+        var distance = player.getAttribute(Attributes.NAME_TAG_DISTANCE);
+        if (distance == null) {
+            throw new IllegalStateException("Native player has no NAME_TAG_DISTANCE attribute");
+        }
+        var packet = new ClientboundUpdateAttributesPacket(player.getId(), List.of());
+        packet.getValues().add(new AttributeSnapshot(Attributes.NAME_TAG_DISTANCE,
+            distance.getBaseValue(), List.copyOf(distance.getModifiers())));
+        return packet;
+    }
+
+    /** UPDATE_DISPLAY_NAME only, using the current ordinary native tab display (including null). */
+    public static ClientboundPlayerInfoUpdatePacket refreshTab(ServerPlayer player) {
+        // Only UUID and displayName are serialized by this action. Do not capture unrelated
+        // connection/game-mode state or synthesize ADD_PLAYER/listed/profile updates.
+        var ordinary = player.getTabListDisplayName();
+        var entry = new Entry(player.getUUID(), null, false, 0,
+            GameType.DEFAULT_MODE, ordinary == null ? null : ordinary.copy(),
+            false, 0, null);
+        return new ClientboundPlayerInfoUpdatePacket(EnumSet.of(Action.UPDATE_DISPLAY_NAME), List.of(entry));
+    }
+
+    /** Pure targeted display update: no profile, listed, game-mode or reconnect actions. */
+    public static ClientboundPlayerInfoUpdatePacket displayName(UUID player, String name) {
+        var entry = new Entry(player, null, false, 0, GameType.DEFAULT_MODE, literal(name), false, 0, null);
+        return new ClientboundPlayerInfoUpdatePacket(EnumSet.of(Action.UPDATE_DISPLAY_NAME), List.of(entry));
+    }
+
+    /**
+     * Create a detached TextDisplay in the player's current native level at explicit coordinates.
+     * Native construction allocates its ID through ServerLevel.getNextEntityId; never register it.
+     * The caller chooses overhead position and recreates the label after world changes.
+     */
+    public static Label createLabel(ServerPlayer player, String text, double x, double y, double z) {
+        validatePosition(x, y, z);
+        var component = literal(text);
+        var level = player.level();
+        if (level == null) { throw new IllegalStateException("Native player has no current server level"); }
+        // A native constructor supplies the exact metadata schema and native ID allocation.
+        // Never spawn, tick, wrap in a Bukkit entity, or expose this detached instance.
+        var display = new TextDisplay(EntityTypes.TEXT_DISPLAY, level);
+        display.persist = false;
+        display.setNoGravity(true);
+        display.setBillboardConstraints(BillboardConstraints.CENTER);
+        display.getEntityData().set(TextDisplay.DATA_LINE_WIDTH_ID, Integer.MAX_VALUE);
+        display.setFlags((byte) (TextDisplay.FLAG_SHADOW | TextDisplay.FLAG_USE_DEFAULT_BACKGROUND));
+        display.setText(component);
+        display.setPos(x, y, z);
+        return new Label(display);
+    }
+
+    private static Component literal(String text) {
+        if (text == null) { throw new IllegalArgumentException("Display text must not be null"); }
+        return Component.literal(text);
+    }
+
+    private static void validatePosition(double x, double y, double z) {
+        if (!Double.isFinite(x) || !Double.isFinite(y) || !Double.isFinite(z)) {
+            throw new IllegalArgumentException("Label coordinates must be finite");
+        }
+    }
+
+    /** A session-owned detached entity; no native entity is exposed for accidental world insertion. */
+    public static final class Label {
+        private final TextDisplay display;
+
+        private Label(TextDisplay display) { this.display = display; }
+
+        public int id() { return display.getId(); }
+        public UUID uuid() { return display.getUUID(); }
+
+        /** Send spawn followed by metadata to each newly eligible viewer. */
+        public ClientboundAddEntityPacket spawn() {
+            return new ClientboundAddEntityPacket(id(), uuid(), display.getX(), display.getY(), display.getZ(),
+                0, 0, display.getType(), 0, Vec3.ZERO, 0);
+        }
+
+        /** Complete metadata, not consumable packDirty state: safe for multiple viewers. */
+        public ClientboundSetEntityDataPacket metadata() {
+            return new ClientboundSetEntityDataPacket(id(), display.getEntityData().packAll());
+        }
+
+        /** Update only the detached label and return an absolute teleport packet. */
+        public ClientboundTeleportEntityPacket move(double x, double y, double z) {
+            validatePosition(x, y, z);
+            display.setPos(x, y, z);
+            return ClientboundTeleportEntityPacket.teleport(id(),
+                PositionMoveRotation.of(display), Set.of(), false);
+        }
+
+        /** Replace only the detached label's literal text and return complete metadata. */
+        public ClientboundSetEntityDataPacket rename(String text) {
+            display.setText(literal(text));
+            return metadata();
+        }
+
+        /** Client-only removal; never calls entity discard/remove on the server world. */
+        public ClientboundRemoveEntitiesPacket remove() {
+            return new ClientboundRemoveEntitiesPacket(id());
+        }
+    }
+}

src/main/java/games/dmg/fantasystick/presentation/ProtocolPresentation.java

@@ -0,0 +1,537 @@
+package games.dmg.fantasystick.presentation;
+
+import com.comphenix.protocol.PacketType;
+import com.comphenix.protocol.ProtocolManager;
+import com.comphenix.protocol.events.ListenerPriority;
+import com.comphenix.protocol.events.PacketAdapter;
+import com.comphenix.protocol.events.PacketContainer;
+import com.comphenix.protocol.events.PacketEvent;
+import com.comphenix.protocol.events.NetworkMarker;
+import com.comphenix.protocol.events.PacketPostListener;
+import games.dmg.fantasystick.presentation.CharacterPresentation.View;
+import java.util.ArrayDeque;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.UUID;
+import java.util.WeakHashMap;
+import java.util.function.Consumer;
+import java.util.function.Supplier;
+import net.minecraft.network.protocol.game.ClientboundAddEntityPacket;
+import net.minecraft.network.protocol.game.ClientboundBundlePacket;
+import net.minecraft.network.protocol.game.ClientboundPlayerInfoRemovePacket;
+import net.minecraft.network.protocol.game.ClientboundPlayerInfoUpdatePacket;
+import net.minecraft.network.protocol.game.ClientboundRemoveEntitiesPacket;
+import net.minecraft.network.protocol.game.ClientboundRespawnPacket;
+import net.minecraft.network.protocol.game.ClientboundSetEntityDataPacket;
+import net.minecraft.network.protocol.game.ClientboundTeleportEntityPacket;
+import net.minecraft.network.protocol.game.ClientboundUpdateAttributesPacket;
+import org.bukkit.GameMode;
+import org.bukkit.craftbukkit.entity.CraftPlayer;
+import org.bukkit.entity.Player;
+import org.bukkit.plugin.Plugin;
+import org.bukkit.scheduler.BukkitTask;
+
+/**
+ * Pinned native output adapter. Public lifecycle methods and the scheduled reconciliation run
+ * on the server thread. Packet callbacks use only immutable decisions, the parent's published
+ * snapshot, packet values and recipient UUIDs. No authoritative presentation is ever changed.
+ * The snapshot supplier is not read during construction: the owner may initialize its field
+ * lazily, then publish a View before calling show/rename. Diagnostics may run on packet threads.
+ */
+public final class ProtocolPresentation implements CharacterPresentation.Output {
+    private final Plugin plugin;
+    private final ProtocolManager protocol;
+    private final Supplier<Map<UUID, View>> snapshot;
+    private final Consumer<Throwable> diagnostics;
+    private final Map<UUID, State> states = new HashMap<>();
+    private final PacketAdapter listener;
+    // Cancelled events never post. Weak keys release their immutable context with the marker.
+    private final Map<NetworkMarker, Map<UUID, Decision>> deliveries = new WeakHashMap<>();
+    private final PacketPostListener postListener = new PacketPostListener() {
+        @Override public Plugin getPlugin() { return plugin; }
+        @Override public void onPostEvent(PacketEvent event) { accepted(event); }
+    };
+    private record Decision(View view, int entity, Map<UUID, Integer> labels) { }
+    private Map<UUID, Decision> decisions = Map.of();
+    private record Route(UUID holder, UUID session, UUID viewer) { }
+    private final Map<Route, Integer> blocked = new HashMap<>();
+    private final Set<Route> retired = new HashSet<>();
+    private final Set<Route> tracking = new HashSet<>();
+    private static final int UNTRACKED = 1;
+    private static final int INVISIBLE = 2;
+    private static final int FAILED = 4;
+    private static final int TAB_REMOVED = 8;
+    private BukkitTask task;
+    private boolean installed;
+    private boolean closed;
+    private int warnings;
+    private boolean operating;
+    private boolean draining;
+    private final ArrayDeque<Runnable> pending = new ArrayDeque<>();
+
+    private static final class State {
+        private final Player player;
+        private int entity;
+        private View view;
+        private org.bukkit.World world;
+        private NativePresentationPackets.Label label;
+        private final Map<UUID, Player> viewers = new HashMap<>();
+        private State(Player player, View view) {
+            this.player = player; this.view = view; this.entity = player.getEntityId();
+            this.world = player.getWorld();
+        }
+    }
+
+    public ProtocolPresentation(Plugin plugin, ProtocolManager protocol,
+            Supplier<Map<UUID, View>> snapshot, Consumer<Throwable> diagnostics) {
+        this.plugin = Objects.requireNonNull(plugin);
+        this.protocol = Objects.requireNonNull(protocol);
+        this.snapshot = Objects.requireNonNull(snapshot);
+        this.diagnostics = Objects.requireNonNull(diagnostics);
+        listener = new PacketAdapter(plugin, ListenerPriority.HIGHEST,
+                PacketType.Play.Server.PLAYER_INFO, PacketType.Play.Server.UPDATE_ATTRIBUTES,
+                PacketType.Play.Server.ENTITY_DESTROY, PacketType.Play.Server.ENTITY_METADATA,
+                PacketType.Play.Server.SPAWN_ENTITY, PacketType.Play.Server.PLAYER_INFO_REMOVE,
+                PacketType.Play.Server.RESPAWN, PacketType.Play.Server.BUNDLE) {
+            @Override public void onPacketSending(PacketEvent event) { project(event); }
+        };
+    }
+
+    /** Idempotent; the supplied manager is the sole ProtocolLib dependency. */
+    public synchronized void install() {
+        if (closed || installed) { return; }
+        installed = true;
+        try {
+            protocol.addPacketListener(listener);
+            task = plugin.getServer().getScheduler().runTaskTimer(plugin, this::tick, 1L, 1L);
+        } catch (RuntimeException | LinkageError failure) {
+            report(failure); close();
+        }
+    }
+
+    @Override public synchronized void show(Player player, View view) {
+        if (!begin(() -> show(player, view))) { return; }
+        try {
+            if (closed || !view.equals(snapshot.get().get(view.holder()))
+                    || !player.getUniqueId().equals(view.holder())) { return; }
+            var old = states.get(view.holder());
+            if (old != null) {
+                if (sameSession(old.view, view)) { rename(view); return; }
+                states.remove(view.holder());
+                removeLabels(old);
+                forget(old);
+            }
+            if (closed || !view.equals(snapshot.get().get(view.holder())) || states.containsKey(view.holder())) { return; }
+            var state = new State(player, view);
+            states.put(view.holder(), state);
+            // Existing trackers predate activation; subsequent viewers need an accepted pairing.
+            for (var viewer : player.getTrackedBy()) { tracking.add(route(view, viewer.getUniqueId())); }
+            publish();
+            refreshTab(state, true);
+            reconcile(state);
+        } finally { finish(); }
+    }
+
+    @Override public synchronized void rename(View view) {
+        if (!begin(() -> rename(view))) { return; }
+        try {
+            var state = states.get(view.holder());
+            if (closed || state == null || !sameSession(state.view, view)
+                    || !view.equals(snapshot.get().get(view.holder()))
+                    || view.revision().compareTo(state.view.revision()) < 0) { return; }
+            state.view = view;
+            publish();
+            refreshTab(state, true);
+            reconcile(state);
+        } finally { finish(); }
+    }
+
+    @Override public synchronized void clear(View view) {
+        if (!begin(() -> clear(view))) { return; }
+        try {
+            var state = states.get(view.holder());
+            if (state == null || !sameSession(state.view, view)) { return; }
+            states.remove(view.holder());
+            publish();
+            removeLabels(state);
+            forget(state);
+            restore(state);
+        } finally { finish(); }
+    }
+
+    private synchronized void tick() {
+        if (!begin(this::tick)) { return; }
+        try {
+            if (closed) { return; }
+            for (var state : List.copyOf(states.values())) {
+                try {
+                    if (!state.player.isOnline() || !sameSession(state.view, snapshot.get().get(state.view.holder()))) {
+                        clear(state.view);
+                    } else { reconcile(state); }
+                } catch (RuntimeException | LinkageError failure) {
+                    report(failure); removeLabels(state);
+                }
+            }
+        } finally { finish(); }
+    }
+
+    private boolean current(State state, View expected) {
+        return !closed && states.get(expected.holder()) == state && expected.equals(state.view)
+            && expected.equals(snapshot.get().get(expected.holder()));
+    }
+
+    private boolean deliver(State state, View expected, Player viewer, Object packet) {
+        // A stale decision is skipped, not classified as an uncertain transport failure.
+        return !current(state, expected) || send(viewer, packet);
+    }
+
+    private void reconcile(State state) {
+        var expected = state.view;
+        if (!current(state, expected)) { return; }
+        try {
+            var player = state.player;
+            for (var id : List.copyOf(state.viewers.keySet())) {
+                if (retired.remove(route(state.view, id))) { state.viewers.remove(id); }
+            }
+            publish();
+            var location = player.getLocation();
+            if (state.world != player.getWorld() || state.entity != player.getEntityId()) {
+                removeLabels(state);
+                if (!current(state, expected)) { return; }
+                state.label = null;
+                state.world = player.getWorld();
+                state.entity = player.getEntityId();
+                // A world/entity change is not delivery evidence. Only an accepted native
+                // spawn may clear UNTRACKED/INVISIBLE, never a tick with stale platform trackers.
+                publish();
+            }
+            if (state.label == null) {
+                state.label = NativePresentationPackets.createLabel(((CraftPlayer) player).getHandle(),
+                    state.view.name(), location.getX(), location.getY() + player.getHeight() + 0.3, location.getZ());
+            }
+            var move = state.label.move(location.getX(), location.getY() + player.getHeight() + 0.3, location.getZ());
+            var metadata = state.label.rename(state.view.name());
+            var tracked = player.getTrackedBy();
+            for (var entry : List.copyOf(state.viewers.entrySet())) {
+                if (!tracked.contains(entry.getValue()) || !eligible(player, entry.getValue())) {
+                    state.viewers.remove(entry.getKey());
+                    removeLabel(state, entry.getValue());
+                }
+            }
+            for (var viewer : tracked) {
+                if (!current(state, expected)) { return; }
+                try {
+                    if (!eligible(player, viewer)) { continue; }
+                    var id = viewer.getUniqueId();
+                    var key = route(state.view, id);
+                    if (!tracking.contains(key) || blocked.containsKey(key)) { continue; }
+                    if (!state.viewers.containsKey(id)) {
+                        state.viewers.put(id, viewer);
+                        publish();
+                        if (!deliver(state, expected, viewer, NativePresentationPackets.suppressNameTag(state.entity))
+                                || !deliver(state, expected, viewer, state.label.spawn()) || !deliver(state, expected, viewer, metadata)) {
+                            quarantine(state, viewer);
+                        }
+                    } else if (!deliver(state, expected, viewer, move) || !deliver(state, expected, viewer, metadata)) {
+                        quarantine(state, viewer);
+                    }
+                } catch (RuntimeException | LinkageError failure) { report(failure); }
+            }
+        } catch (RuntimeException | LinkageError failure) { report(failure); removeLabels(state); }
+        finally { publish(); }
+    }
+
+    private void quarantine(State state, Player viewer) {
+        if (states.get(state.view.holder()) != state) { return; }
+        var id = viewer.getUniqueId();
+        // A send can have escaped before throwing. Retire once; never retry its spawn sequence.
+        blocked.merge(route(state.view, id), FAILED, (before, flag) -> before | flag);
+        state.viewers.remove(id);
+        publish();
+        send(viewer, state.label.remove());
+    }
+
+    private boolean eligible(Player target, Player viewer) {
+        if (viewer.getUniqueId().equals(target.getUniqueId()) || !viewer.isOnline()
+                || target.getWorld() != viewer.getWorld() || !viewer.canSee(target)
+                || target.isInvisible() || target.getGameMode() == GameMode.SPECTATOR) { return false; }
+        var nativeTarget = ((CraftPlayer) target).getHandle();
+        var distance = nativeTarget.getAttribute(net.minecraft.world.entity.ai.attributes.Attributes.NAME_TAG_DISTANCE);
+        if (distance == null) { return false; }
+        double range = distance.getValue();
+        if (target.isSneaking()) { range = Math.min(32, range); }
+        if (!(range > 0) || !(viewer.getLocation().distanceSquared(target.getLocation()) < range * range)) { return false; }
+        // The recipient's native scoreboard is the one its client sees (it may differ from
+        // the main scoreboard). Read existing membership only; never create private teams.
+        var board = ((CraftPlayer) viewer).getScoreboard().getHandle();
+        var team = board.getPlayersTeam(target.getName());
+        if (team == null) { return true; }
+        var viewerTeam = board.getPlayersTeam(viewer.getName());
+        return switch (team.getNameTagVisibility()) {
+            case ALWAYS -> true;
+            case NEVER -> false;
+            case HIDE_FOR_OTHER_TEAMS -> viewerTeam == null || team.isAlliedTo(viewerTeam);
+            case HIDE_FOR_OWN_TEAM -> viewerTeam == null || !team.isAlliedTo(viewerTeam);
+        };
+    }
+
+    private void refreshTab(State state, boolean fantasy) {
+        var expected = state.view;
+        try {
+            var ordinary = NativePresentationPackets.refreshTab(((CraftPlayer) state.player).getHandle());
+            var packet = fantasy ? NativePresentationPackets.projectPlayerInfo(ordinary, state.view.holder(), state.view.name()) : ordinary;
+            for (var viewer : List.copyOf(plugin.getServer().getOnlinePlayers())) {
+                if (fantasy ? !current(state, expected) : !restorable(state)) { return; }
+                try { if (viewer.canSee(state.player)) { send(viewer, packet); } }
+                catch (RuntimeException | LinkageError failure) { report(failure); }
+            }
+        } catch (RuntimeException | LinkageError failure) { report(failure); }
+    }
+
+    private boolean restorable(State state) {
+        var replacement = snapshot.get().get(state.view.holder());
+        return !states.containsKey(state.view.holder()) && (replacement == null || sameSession(state.view, replacement));
+    }
+
+    private void restore(State state) {
+        if (!restorable(state)) { return; }
+        refreshTab(state, false);
+        try {
+            var packet = NativePresentationPackets.restoreNameTag(((CraftPlayer) state.player).getHandle());
+            var recipients = new HashSet<>(state.player.getTrackedBy());
+            recipients.add(state.player);
+            for (var viewer : recipients) {
+                if (!restorable(state)) { return; }
+                try { if (viewer.canSee(state.player)) { send(viewer, packet); } }
+                catch (RuntimeException | LinkageError failure) { report(failure); }
+            }
+        } catch (RuntimeException | LinkageError failure) { report(failure); }
+    }
+
+    private void removeLabel(State state, Player viewer) {
+        if (!send(viewer, state.label.remove()) && states.get(state.view.holder()) == state) {
+            blocked.merge(route(state.view, viewer.getUniqueId()), FAILED, (before, flag) -> before | flag);
+        }
+    }
+
+    private void removeLabels(State state) {
+        var viewers = List.copyOf(state.viewers.values());
+        var label = state.label;
+        state.viewers.clear();
+        publish();
+        if (label != null) {
+            for (var viewer : viewers) {
+                if (!send(viewer, label.remove()) && states.get(state.view.holder()) == state) {
+                    blocked.merge(route(state.view, viewer.getUniqueId()), FAILED, (before, flag) -> before | flag);
+                }
+            }
+        }
+    }
+
+    private void publish() {
+        var next = new HashMap<UUID, Decision>();
+        for (var state : states.values()) {
+            var labels = new HashMap<UUID, Integer>();
+            if (state.label != null) {
+                for (var viewer : state.viewers.keySet()) { labels.put(viewer, state.label.id()); }
+            }
+            next.put(state.view.holder(), new Decision(state.view, state.entity, Map.copyOf(labels)));
+        }
+        decisions = Map.copyOf(next);
+    }
+
+    private static Route route(View view, UUID viewer) { return new Route(view.holder(), view.session(), viewer); }
+
+    private void forget(State state) {
+        blocked.keySet().removeIf(key -> key.holder().equals(state.view.holder()) && key.session().equals(state.view.session()));
+        retired.removeIf(key -> key.holder().equals(state.view.holder()) && key.session().equals(state.view.session()));
+        tracking.removeIf(key -> key.holder().equals(state.view.holder()) && key.session().equals(state.view.session()));
+    }
+
+    private synchronized void project(PacketEvent event) {
+        if (closed) { return; }
+        try {
+            var original = event.getPacket().getHandle();
+            var viewer = event.getPlayer().getUniqueId();
+            reserveSpawn(original, viewer);
+            if (event.isCancelled()) { return; }
+            var marker = event.getNetworkMarker();
+            deliveries.putIfAbsent(marker, decisions);
+            marker.addPostListener(postListener); // The parent and children share this deduplicating set.
+            // ProtocolLib visits children AFTER the parent, including lower-priority vetoes.
+            // Never expand a child into a bundle or mutate route state speculatively here.
+            Object projected = original;
+            for (var decision : decisions.values()) {
+                var view = currentView(decision);
+                if (view == null) { continue; }
+                if (projected instanceof ClientboundPlayerInfoUpdatePacket info) {
+                    projected = NativePresentationPackets.projectPlayerInfo(info, view.holder(), view.name());
+                } else if (projected instanceof ClientboundUpdateAttributesPacket attributes) {
+                    projected = NativePresentationPackets.projectAttributes(attributes, decision.entity());
+                }
+            }
+            if (projected != original) { event.setPacket(wrap(projected)); }
+        } catch (RuntimeException | LinkageError failure) { report(failure); }
+    }
+
+    private void reserveSpawn(Object packet, UUID viewer) {
+        if (packet instanceof ClientboundBundlePacket bundle) {
+            bundle.subPackets().forEach(child -> reserveSpawn(child, viewer));
+        } else if (packet instanceof ClientboundAddEntityPacket spawn) {
+            var decision = decisions.get(spawn.getUUID());
+            if (decision != null && decision.entity() == spawn.getId() && !decision.labels().containsKey(viewer)) {
+                // A tick between dispatch and post must not invent a successful new pairing.
+                // Do not retire an existing label or clear any visibility flag on an attempt.
+                blocked.merge(route(decision.view(), viewer), UNTRACKED, (before, flag) -> before | flag);
+            }
+        }
+    }
+
+    /** Native topology survives renames; any rendering payload uses the latest published view. */
+    private View currentView(Decision expected) {
+        var now = decisions.get(expected.view().holder());
+        var latest = snapshot.get().get(expected.view().holder());
+        return !closed && now != null && now.entity() == expected.entity()
+            && sameSession(expected.view(), now.view()) && sameSession(expected.view(), latest) ? latest : null;
+    }
+
+    private synchronized void accepted(PacketEvent event) {
+        if (!begin(() -> accepted(event))) { return; }
+        try {
+            var captured = deliveries.remove(NetworkMarker.getNetworkMarker(event));
+            if (closed || event.isCancelled() || captured == null) { return; }
+            var viewer = event.getPlayer();
+            var id = viewer.getUniqueId();
+            var removals = new HashMap<Decision, Integer>();
+            var displays = new HashSet<Decision>();
+            commitNative(event.getPacket().getHandle(), id, captured, removals, displays);
+            for (var entry : removals.entrySet()) {
+                var decision = entry.getKey();
+                if (currentView(decision) != null && !send(viewer, new ClientboundRemoveEntitiesPacket(entry.getValue()))) {
+                    blocked.merge(route(decision.view(), id), FAILED, (before, flag) -> before | flag);
+                }
+            }
+            for (var decision : displays) {
+                var view = currentView(decision);
+                if (view != null && (blocked.getOrDefault(route(view, id), 0) & TAB_REMOVED) == 0) {
+                    send(viewer, NativePresentationPackets.displayName(view.holder(), view.name()));
+                }
+            }
+        } catch (RuntimeException | LinkageError failure) { report(failure); }
+        finally { finish(); }
+    }
+
+    private void commitNative(Object packet, UUID viewer, Map<UUID, Decision> captured,
+            Map<Decision, Integer> removals, Set<Decision> displays) {
+        if (packet instanceof ClientboundBundlePacket bundle) {
+            bundle.subPackets().forEach(child -> commitNative(child, viewer, captured, removals, displays));
+            return;
+        }
+        for (var decision : captured.values()) {
+            var view = currentView(decision);
+            if (view == null) { continue; }
+            var key = route(view, viewer);
+            int mask = blocked.getOrDefault(key, 0);
+            if (packet instanceof ClientboundPlayerInfoUpdatePacket info) {
+                if (info.actions().contains(ClientboundPlayerInfoUpdatePacket.Action.ADD_PLAYER)
+                        && info.entries().stream().anyMatch(entry -> entry.profileId().equals(view.holder()))) {
+                    mask &= ~TAB_REMOVED;
+                    if (!info.actions().contains(ClientboundPlayerInfoUpdatePacket.Action.UPDATE_DISPLAY_NAME)) {
+                        displays.add(decision);
+                    }
+                }
+            } else if (packet instanceof ClientboundRemoveEntitiesPacket removal
+                    && removal.getEntityIds().contains(decision.entity())) { mask |= UNTRACKED; }
+            else if (packet instanceof ClientboundPlayerInfoRemovePacket removal
+                    && removal.profileIds().contains(view.holder())) { mask |= TAB_REMOVED; }
+            else if (packet instanceof ClientboundRespawnPacket) { mask |= UNTRACKED; }
+            else if (packet instanceof ClientboundAddEntityPacket spawn && spawn.getId() == decision.entity()
+                    && spawn.getUUID().equals(view.holder())) {
+                mask &= ~(UNTRACKED | INVISIBLE);
+                tracking.add(key);
+            }
+            else if (packet instanceof ClientboundSetEntityDataPacket metadata && metadata.id() == decision.entity()) {
+                for (var value : metadata.packedItems()) {
+                    if (value.id() == 0 && value.serializer() == net.minecraft.network.syncher.EntityDataSerializers.BYTE
+                            && value.value() instanceof Byte flags) {
+                        mask = (flags & 0x20) != 0 ? mask | INVISIBLE : mask & ~INVISIBLE;
+                    }
+                }
+            }
+            if (mask == 0) { blocked.remove(key); } else { blocked.put(key, mask); }
+            var label = decisions.get(view.holder()).labels().get(viewer);
+            if (mask != 0 && label != null && retired.add(key)) { removals.put(decision, label); }
+        }
+    }
+
+    private boolean send(Player viewer, Object raw) {
+        try { protocol.sendServerPacket(viewer, wrap(raw), false); return true; }
+        catch (RuntimeException | LinkageError failure) { report(failure); return false; }
+    }
+
+    private boolean begin(Runnable retry) {
+        if (operating) { pending.add(retry); return false; }
+        operating = true;
+        return true;
+    }
+
+    private void finish() {
+        operating = false;
+        if (draining) { return; }
+        // Reentrant lifecycle operations wait until the transport attempt AND its failure/
+        // resource bookkeeping finish. Cleanup is thus ordered after every possibly escaped
+        // old packet, and a queued rename cannot continue an uncertain spawn. Never replay it.
+        draining = true;
+        try {
+            while (!pending.isEmpty()) {
+                try { pending.removeFirst().run(); }
+                catch (RuntimeException | LinkageError failure) { report(failure); }
+            }
+        } finally { draining = false; }
+    }
+
+    private static PacketContainer wrap(Object raw) {
+        PacketType type;
+        if (raw instanceof ClientboundBundlePacket) { type = PacketType.Play.Server.BUNDLE; }
+        else if (raw instanceof ClientboundPlayerInfoUpdatePacket) { type = PacketType.Play.Server.PLAYER_INFO; }
+        else if (raw instanceof ClientboundUpdateAttributesPacket) { type = PacketType.Play.Server.UPDATE_ATTRIBUTES; }
+        else if (raw instanceof ClientboundAddEntityPacket) { type = PacketType.Play.Server.SPAWN_ENTITY; }
+        else if (raw instanceof ClientboundSetEntityDataPacket) { type = PacketType.Play.Server.ENTITY_METADATA; }
+        else if (raw instanceof ClientboundTeleportEntityPacket) { type = PacketType.Play.Server.ENTITY_TELEPORT; }
+        else if (raw instanceof ClientboundRemoveEntitiesPacket) { type = PacketType.Play.Server.ENTITY_DESTROY; }
+        else { throw new IllegalArgumentException("Unsupported presentation packet"); }
+        return new PacketContainer(type, raw);
+    }
+
+    private static boolean sameSession(View first, View second) {
+        return second != null && first.holder().equals(second.holder())
+            && first.session().equals(second.session()) && first.character().equals(second.character());
+    }
+
+    private void report(Throwable failure) {
+        if (warnings < 8) {
+            warnings++;
+            try { diagnostics.accept(failure); } catch (RuntimeException | LinkageError ignored) { /* Cleanup must continue. */ }
+        }
+    }
+
+    @Override public synchronized void close() {
+        if (!begin(this::close)) { return; }
+        try {
+            if (closed) { return; }
+            closed = true;
+            deliveries.clear();
+            if (task != null) {
+                try { task.cancel(); } catch (RuntimeException | LinkageError failure) { report(failure); }
+            }
+            if (installed) {
+                try { protocol.removePacketListener(listener); } catch (RuntimeException | LinkageError failure) { report(failure); }
+            }
+            for (var state : List.copyOf(states.values())) { clear(state.view); }
+        } finally { finish(); }
+    }
+}

src/main/java/games/dmg/fantasystick/presentation/SessionPresentation.java

@@ -0,0 +1,16 @@
+package games.dmg.fantasystick.presentation;
+
+import games.dmg.fantasystick.persistence.CharacterRecord;
+import java.util.UUID;
+import org.bukkit.entity.Player;
+
+/** Session-owned output only. Withdrawal must invalidate decisions even when native cleanup fails. */
+public interface SessionPresentation {
+    SessionPresentation NONE = new SessionPresentation() {
+        @Override public void activate(Player player, UUID session, CharacterRecord record) { }
+        @Override public void withdraw(UUID player, UUID session) { }
+    };
+    void activate(Player player, UUID session, CharacterRecord record);
+    /** May be called by a failed worker completion: no worker Bukkit access is permitted. */
+    void withdraw(UUID player, UUID session);
+}

src/main/java/games/dmg/fantasystick/progression/CharacterProgress.java

@@ -19,6 +19,7 @@ public final class CharacterProgress {
 
     private final UUID characterId;
     private final ProgressionRules rules;
+    private final BigDecimal nativeHealthLimit;
     private final EnumMap<Stat, BigInteger> stats = new EnumMap<>(Stat.class);
     private int level = 1;
     private BigInteger experience = BigInteger.ZERO;
@@ -26,11 +27,19 @@ public final class CharacterProgress {
     private BigInteger revision = BigInteger.ZERO;
     private BigDecimal health = BigDecimal.TEN;
 
+    /** Uses the pinned runtime's default ceiling. Runtime adapters must supply their actual limit. */
     public CharacterProgress(UUID characterId, ProgressionRules rules) {
+        this(characterId, rules, new BigDecimal("1024"));
+    }
+
+    public CharacterProgress(UUID characterId, ProgressionRules rules, BigDecimal nativeHealthLimit) {
         this.characterId = Objects.requireNonNull(characterId);
         this.rules = Objects.requireNonNull(rules);
+        this.nativeHealthLimit = Objects.requireNonNull(nativeHealthLimit);
+        if (nativeHealthLimit.signum() <= 0) throw new IllegalArgumentException("Native health limit must be positive");
         this.points = rules.startingPoints();
         for (Stat stat : Stat.values()) stats.put(stat, BigInteger.ZERO);
+        this.health = maximumHealth();
     }
 
     public synchronized Snapshot snapshot() {
@@ -47,9 +56,10 @@ public final class CharacterProgress {
         if (!revision.equals(expectedRevision)) return Purchase.STALE_REVISION;
         if (health.signum() == 0) return Purchase.NOT_ALIVE;
         if (points.signum() == 0) return Purchase.NO_POINTS;
+        BigDecimal previousMaximum = maximumHealth();
         stats.put(stat, stats.get(stat).add(BigInteger.ONE));
         points = points.subtract(BigInteger.ONE);
-        if (stat == Stat.CON) health = health.add(BigDecimal.ONE);
+        if (stat == Stat.CON) health = health.add(maximumHealth().subtract(previousMaximum));
         revision = revision.add(BigInteger.ONE);
         return Purchase.APPLIED;
     }
@@ -80,6 +90,6 @@ public final class CharacterProgress {
     }
 
     private BigDecimal maximumHealth() {
-        return new BigDecimal(stats.get(Stat.CON).add(BigInteger.TEN));
+        return new BigDecimal(stats.get(Stat.CON).add(BigInteger.TEN)).min(nativeHealthLimit);
     }
 }

src/main/java/games/dmg/fantasystick/progression/CombatContributions.java

@@ -0,0 +1,48 @@
+package games.dmg.fantasystick.progression;
+
+import java.time.Instant;
+import java.util.HashMap;
+import java.util.LinkedHashSet;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.UUID;
+
+/** Server-thread bounded contribution ledger keyed by target and originating character. */
+public final class CombatContributions implements AutoCloseable {
+    private final CombatRewardRules rules;
+    private final Map<UUID, Map<UUID, Instant>> targets = new HashMap<>();
+    private boolean closed;
+
+    public CombatContributions(CombatRewardRules rules) { this.rules = Objects.requireNonNull(rules); }
+
+    public void accept(UUID target, UUID character, Instant acceptedAt) {
+        Objects.requireNonNull(target); Objects.requireNonNull(character); Objects.requireNonNull(acceptedAt);
+        if (closed) return;
+        targets.computeIfAbsent(target, ignored -> new HashMap<>()).merge(character, acceptedAt,
+            (previous, next) -> previous.isAfter(next) ? previous : next);
+    }
+
+    public Set<UUID> consume(UUID target, Instant deathAt) {
+        Objects.requireNonNull(target); Objects.requireNonNull(deathAt);
+        if (closed) return Set.of();
+        var contributions = targets.remove(target);
+        if (contributions == null) return Set.of();
+        var eligible = new LinkedHashSet<UUID>();
+        contributions.forEach((character, acceptedAt) -> {
+            if (rules.contributes(acceptedAt, deathAt)) eligible.add(character);
+        });
+        return Set.copyOf(eligible);
+    }
+
+    public void invalidate(UUID target) { if (!closed) targets.remove(Objects.requireNonNull(target)); }
+
+    public void sweep(Instant now) {
+        Objects.requireNonNull(now);
+        if (closed) return;
+        targets.values().forEach(contributions -> contributions.entrySet().removeIf(entry -> !rules.contributes(entry.getValue(), now)));
+        targets.values().removeIf(Map::isEmpty);
+    }
+
+    @Override public void close() { closed = true; targets.clear(); }
+}

src/main/java/games/dmg/fantasystick/progression/CombatRewardRules.java

@@ -0,0 +1,76 @@
+package games.dmg.fantasystick.progression;
+
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.time.Duration;
+import java.time.Instant;
+import java.util.Objects;
+import java.util.UUID;
+
+/** Validated combat reward arithmetic and location policy; native classification lives at the adapter. */
+public record CombatRewardRules(BigInteger passivePool, BigInteger ordinaryPool, BigInteger bossPool,
+                                BigDecimal restrictedSpacing) {
+    public enum Target { PASSIVE, ORDINARY, BOSS, FANTASY_CHARACTER }
+    public static final Duration CONTRIBUTION_LIFETIME = Duration.ofMinutes(5);
+
+    public record KillPosition(UUID world, BigDecimal x, BigDecimal y, BigDecimal z) {
+        public KillPosition {
+            Objects.requireNonNull(world);
+            x = coordinate(x); y = coordinate(y); z = coordinate(z);
+        }
+        private static BigDecimal coordinate(BigDecimal value) {
+            Objects.requireNonNull(value);
+            if (!Double.isFinite(value.doubleValue())) throw new IllegalArgumentException("Kill coordinate is not finite");
+            return value;
+        }
+    }
+
+    public CombatRewardRules {
+        Objects.requireNonNull(passivePool); Objects.requireNonNull(ordinaryPool);
+        Objects.requireNonNull(bossPool); Objects.requireNonNull(restrictedSpacing);
+        if (passivePool.signum() < 0 || ordinaryPool.signum() < 0 || bossPool.signum() < 0
+                || restrictedSpacing.signum() < 0 || !Double.isFinite(restrictedSpacing.doubleValue())) {
+            throw new IllegalArgumentException("Combat reward values must be finite and nonnegative");
+        }
+    }
+
+    public static CombatRewardRules defaults() {
+        return new CombatRewardRules(BigInteger.ONE, BigInteger.TEN, BigInteger.valueOf(100), BigDecimal.valueOf(3));
+    }
+
+    public BigInteger pool(Target target, int defeatedLevel) {
+        Objects.requireNonNull(target);
+        if (target == Target.FANTASY_CHARACTER) {
+            if (defeatedLevel < 1) throw new IllegalArgumentException("Fantasy character level must be positive");
+            return BigInteger.TEN.multiply(BigInteger.valueOf(defeatedLevel));
+        }
+        return switch (target) {
+            case PASSIVE -> passivePool;
+            case ORDINARY -> ordinaryPool;
+            case BOSS -> bossPool;
+            case FANTASY_CHARACTER -> throw new IllegalStateException("Handled fantasy character");
+        };
+    }
+
+    public BigInteger share(BigInteger pool, int contributors) {
+        Objects.requireNonNull(pool);
+        if (pool.signum() < 0 || contributors < 1) throw new IllegalArgumentException("Invalid reward share");
+        var count = BigInteger.valueOf(contributors);
+        return pool.add(count).subtract(BigInteger.ONE).divide(count);
+    }
+
+    public boolean contributes(Instant acceptedAt, Instant deathAt) {
+        Objects.requireNonNull(acceptedAt); Objects.requireNonNull(deathAt);
+        return !acceptedAt.isAfter(deathAt) && !deathAt.isAfter(acceptedAt.plus(CONTRIBUTION_LIFETIME));
+    }
+
+    public boolean spaced(KillPosition previous, KillPosition current) {
+        Objects.requireNonNull(previous); Objects.requireNonNull(current);
+        if (!previous.world().equals(current.world())) return true;
+        BigDecimal dx = current.x().subtract(previous.x());
+        BigDecimal dy = current.y().subtract(previous.y());
+        BigDecimal dz = current.z().subtract(previous.z());
+        BigDecimal squared = dx.multiply(dx).add(dy.multiply(dy)).add(dz.multiply(dz));
+        return squared.compareTo(restrictedSpacing.multiply(restrictedSpacing)) >= 0;
+    }
+}

src/main/java/games/dmg/fantasystick/session/AdventureModeLease.java

@@ -0,0 +1,90 @@
+package games.dmg.fantasystick.session;
+
+import java.util.UUID;
+import org.bukkit.GameMode;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Player;
+import org.bukkit.persistence.PersistentDataType;
+
+/** Main-thread holder/session proof for optional Adventure mode; the receipt must already be saved. */
+public final class AdventureModeLease implements org.bukkit.event.Listener {
+    @org.bukkit.event.EventHandler(priority = org.bukkit.event.EventPriority.MONITOR, ignoreCancelled = true)
+    public void changed(org.bukkit.event.player.PlayerGameModeChangeEvent event) {
+        if (event.isCancelled()) return;
+        var player = event.getPlayer();
+        var mark = read(player);
+        // Events precede the write. A currently non-Adventure mode proves a previous
+        // external change already happened, even when this new request returns to Adventure.
+        // A lone external change is also detected directly by restore(). Never infer success
+        // from this event's requested value, which a later listener may still cancel.
+        if (mark != null && mark.phase() == Phase.APPLIED && player.getGameMode() != GameMode.ADVENTURE) {
+            write(player, new Mark(mark.session(), mark.previous(), Phase.RELEASED));
+        }
+    }
+    private static final NamespacedKey KEY = new NamespacedKey("fantasystick", "adventure_session");
+    private enum Phase { APPLYING, APPLIED, RESTORING, RELEASED }
+    private record Mark(UUID session, String previous, Phase phase) {
+        boolean matches(UUID expected, String original) { return session.equals(expected) && previous.equals(original); }
+    }
+
+    public boolean available(Player player) {
+        var mark = read(player);
+        return !player.getPersistentDataContainer().has(KEY) || mark != null && mark.phase() == Phase.RELEASED;
+    }
+
+    public boolean enter(Player player, UUID session, String previous) {
+        if (previous == null) return true;
+        var existing = read(player);
+        if (player.getPersistentDataContainer().has(KEY) && (existing == null || existing.phase() != Phase.RELEASED)) {
+            return existing != null && existing.matches(session, previous) && existing.phase() == Phase.APPLIED
+                && player.getGameMode() == GameMode.ADVENTURE;
+        }
+        if (player.getGameMode() != GameMode.valueOf(previous)) return false;
+        write(player, new Mark(session, previous, Phase.APPLYING));
+        player.setGameMode(GameMode.ADVENTURE);
+        if (player.getGameMode() != GameMode.ADVENTURE) {
+            write(player, new Mark(session, previous, Phase.RELEASED));
+            return false;
+        }
+        write(player, new Mark(session, previous, Phase.APPLIED));
+        return true;
+    }
+
+    public boolean restore(Player player, UUID session, String previous) {
+        if (previous == null) return true;
+        var mark = read(player);
+        if (mark == null || !mark.matches(session, previous)) return false;
+        if (mark.phase() == Phase.RELEASED) return true;
+        if (mark.phase() != Phase.APPLIED) return false; // Interrupted setter is not restoration proof.
+        if (player.getGameMode() != GameMode.ADVENTURE) {
+            write(player, new Mark(session, previous, Phase.RELEASED));
+            return true; // A later external/admin change is not ours to undo.
+        }
+        write(player, new Mark(session, previous, Phase.RESTORING));
+        player.setGameMode(GameMode.valueOf(previous));
+        if (player.getGameMode() == GameMode.ADVENTURE && !previous.equals("ADVENTURE")) {
+            write(player, new Mark(session, previous, Phase.APPLIED));
+            return false; // Native veto: unchanged and still owned, not successful restoration.
+        }
+        write(player, new Mark(session, previous, Phase.RELEASED));
+        return true;
+    }
+
+    private static Mark read(Player player) {
+        var data = player.getPersistentDataContainer();
+        if (!data.has(KEY, PersistentDataType.STRING)) return null;
+        try {
+            String[] fields = data.get(KEY, PersistentDataType.STRING).split("\\|", -1);
+            if (fields.length != 4 || !fields[0].equals("1")) return null;
+            var session = UUID.fromString(fields[1]);
+            if (!session.toString().equals(fields[1])) return null;
+            GameMode.valueOf(fields[2]);
+            return new Mark(session, fields[2], Phase.valueOf(fields[3]));
+        } catch (IllegalArgumentException invalid) { return null; }
+    }
+
+    private static void write(Player player, Mark mark) {
+        player.getPersistentDataContainer().set(KEY, PersistentDataType.STRING,
+            "1|" + mark.session() + "|" + mark.previous() + "|" + mark.phase());
+    }
+}

src/main/java/games/dmg/fantasystick/session/ControlInput.java

@@ -0,0 +1,31 @@
+package games.dmg.fantasystick.session;
+
+import java.util.Objects;
+import java.util.function.BooleanSupplier;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.Player;
+
+/**
+ * Internal server-thread input port for book/combat/ability adapters, not an add-on API.
+ * Containment of vanilla item behavior is separate from executing an ability. Recipients
+ * must revalidate after deferred work; this notification is never durable cast authority.
+ */
+public record ControlInput(Player player, EquipmentSessions.Active session, int slot, String ability,
+                           Kind kind, Gesture gesture, Entity target, int heldTicks, float attackStrength,
+                           BooleanSupplier validity) {
+    public enum Kind { BOOK, BASIC_ATTACK, ABILITY }
+    public enum Gesture { USE, ATTACK, DRAW_RELEASE }
+
+    public ControlInput {
+        Objects.requireNonNull(player);
+        Objects.requireNonNull(session);
+        Objects.requireNonNull(ability);
+        Objects.requireNonNull(kind);
+        Objects.requireNonNull(gesture);
+        Objects.requireNonNull(validity);
+        if (slot < 0 || slot > 8 || heldTicks < 0 || !Float.isFinite(attackStrength)
+                || attackStrength < 0 || attackStrength > 1) throw new IllegalArgumentException("Invalid control input");
+    }
+
+    public boolean stillCurrent() { return validity.getAsBoolean(); }
+}

src/main/java/games/dmg/fantasystick/session/EquipmentAdminCommand.java

@@ -0,0 +1,147 @@
+package games.dmg.fantasystick.session;
+
+import games.dmg.fantasystick.persistence.EquipmentSessionStore;
+import java.util.List;
+import java.util.Objects;
+import java.util.UUID;
+import java.util.function.Consumer;
+import org.bukkit.Server;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.command.TabExecutor;
+
+/** Server-thread command entry; persistence callbacks never access senders or players. */
+public final class EquipmentAdminCommand implements TabExecutor, AutoCloseable {
+    public static final String PERMISSION = "fantasystick.admin";
+    public record Failure(UUID player, String operation, Throwable cause) { }
+    private final EquipmentSessionStore receipts;
+    private final EquipmentSessions sessions;
+    private final Server server;
+    private final Consumer<Runnable> nextTick;
+    private final Consumer<Failure> diagnostics;
+    private volatile boolean closed;
+    private games.dmg.fantasystick.persistence.AdventureSettings settings;
+
+    public EquipmentAdminCommand(EquipmentSessionStore receipts, EquipmentSessions sessions, Server server,
+                                 Consumer<Runnable> nextTick, Consumer<Failure> diagnostics) {
+        this.receipts = Objects.requireNonNull(receipts);
+        this.sessions = Objects.requireNonNull(sessions);
+        this.server = Objects.requireNonNull(server);
+        this.nextTick = Objects.requireNonNull(nextTick);
+        this.diagnostics = Objects.requireNonNull(diagnostics);
+    }
+
+    public EquipmentAdminCommand(EquipmentSessionStore receipts, EquipmentSessions sessions, Server server,
+                                 Consumer<Runnable> nextTick, Consumer<Failure> diagnostics,
+                                 games.dmg.fantasystick.persistence.AdventureSettings settings) {
+        this(receipts, sessions, server, nextTick, diagnostics);
+        this.settings = Objects.requireNonNull(settings);
+    }
+
+    @Override public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+        if (closed) return true;
+        if (!sender.hasPermission(PERMISSION)) {
+            sender.sendMessage("You need fantasystick.admin to administer Fantasy Stick.");
+            return true;
+        }
+        if (args.length > 0 && args[0].equals("config")) {
+            configuration(sender, args);
+            return true;
+        }
+        UUID owner;
+        try {
+            if (args.length != 2 || !(args[0].equals("inspect") || args[0].equals("recover"))) {
+                throw new IllegalArgumentException("Invalid command shape");
+            }
+            owner = UUID.fromString(args[1]);
+            if (!owner.toString().equalsIgnoreCase(args[1])) throw new IllegalArgumentException("Noncanonical UUID shape");
+        } catch (IllegalArgumentException invalid) {
+            sender.sendMessage("Usage: /fantasystick <inspect|recover> <player-uuid> (full UUID required)");
+            return true;
+        }
+        if (args[0].equals("recover")) {
+            var player = server.getPlayer(owner);
+            if (player == null || !player.isOnline()) {
+                sender.sendMessage("Recovery refused: target " + owner + " must be online. No items changed.");
+                return true;
+            }
+            sessions.recover(player);
+            sender.sendMessage("Validated equipment recovery requested for " + owner
+                + ". This is not confirmation of restoration; ambiguous items and receipts are retained.");
+            return true;
+        }
+        receipts.find(owner).whenComplete((state, failure) -> {
+            if (failure != null) report(owner, "inspect", failure);
+            if (closed) return;
+            try {
+                nextTick.accept(() -> {
+                    if (closed || !sender.hasPermission(PERMISSION)) return;
+                    if (sender instanceof org.bukkit.entity.Player player && !player.isOnline()) return;
+                    if (failure != null) {
+                        sender.sendMessage("Equipment inspection failed for " + owner + "; retained state requires inspection. See server diagnostics.");
+                        return;
+                    }
+                    sender.sendMessage("Equipment receipt player=" + owner + " (file and native observations are not atomic)");
+                    if (state.isEmpty()) sender.sendMessage("Saved receipt: none; pending=none; last exit=none.");
+                    else {
+                        var saved = state.orElseThrow();
+                        var pending = saved.pending();
+                        sender.sendMessage(pending == null ? "pending=none" : "pending session=" + pending.sessionId()
+                            + " character=" + pending.characterId() + " prepared=" + pending.preparedAt());
+                        var exit = saved.lastExit();
+                        sender.sendMessage(exit == null ? "last exit=none; deadline=none" : "last exit session=" + exit.sessionId()
+                            + " character=" + exit.characterId() + " exited=" + exit.exitedAt() + " deadline=" + exit.deadline());
+                    }
+                    var player = server.getPlayer(owner);
+                    if (player == null || !player.isOnline()) sender.sendMessage("Native state: offline; not inspected.");
+                    else {
+                        var marker = EquipmentSessionMarker.read(player);
+                        sender.sendMessage("Online native marker=" + marker.map(token -> "session=" + token.session()
+                            + " character=" + token.character() + " phase=" + token.phase()).orElseGet(() ->
+                                EquipmentSessionMarker.present(player) ? "malformed (retained)" : "none"));
+                        sender.sendMessage("Online active=" + sessions.active(owner).map(active -> "session=" + active.session()
+                            + " character=" + active.character()).orElse("none"));
+                    }
+                });
+            } catch (RuntimeException rejected) { report(owner, "inspect-response", rejected); }
+        });
+        return true;
+    }
+
+    private void configuration(CommandSender sender, String[] args) {
+        if (args.length < 2 || args.length > 3 || !args[1].equals("adventure-mode")
+                || args.length == 3 && !args[2].equals("true") && !args[2].equals("false")) {
+            sender.sendMessage("Usage: /fantasystick config adventure-mode [true|false]");
+            return;
+        }
+        if (settings == null) { sender.sendMessage("Adventure configuration is unavailable."); return; }
+        if (args.length == 2) {
+            sender.sendMessage("adventure-mode=" + settings.enabled() + " (applies to new sessions only)");
+            return;
+        }
+        settings.set(Boolean.parseBoolean(args[2])).whenComplete((saved, failure) -> {
+            if (failure != null) report(null, "config-adventure-mode", failure);
+            if (closed) return;
+            try {
+                nextTick.accept(() -> {
+                    if (closed || !sender.hasPermission(PERMISSION)
+                            || sender instanceof org.bukkit.entity.Player player && !player.isOnline()) return;
+                    sender.sendMessage(failure == null
+                        ? "Saved adventure-mode=" + saved + " for new sessions only; active sessions are unchanged."
+                        : "Adventure configuration save failed; the effective setting is unchanged.");
+                });
+            } catch (RuntimeException rejected) { report(null, "config-response", rejected); }
+        });
+    }
+
+    private void report(UUID owner, String operation, Throwable cause) {
+        try { diagnostics.accept(new Failure(owner, operation, cause)); }
+        catch (RuntimeException ignored) { /* Diagnostics cannot authorize recovery. */ }
+    }
+
+    // Never fall back to Bukkit's online-player-name suggestions for a UUID-only admin interface.
+    @Override public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
+        return List.of();
+    }
+    @Override public void close() { closed = true; }
+}

src/main/java/games/dmg/fantasystick/session/EquipmentSessionEvents.java

@@ -0,0 +1,896 @@
+package games.dmg.fantasystick.session;
+
+import games.dmg.fantasystick.crafting.ManualDropDelivery;
+import games.dmg.fantasystick.crafting.PlayerSheetDrops;
+import games.dmg.fantasystick.items.CharacterSheets;
+import games.dmg.fantasystick.items.EquipmentStorage;
+import games.dmg.fantasystick.items.SessionControls;
+import io.papermc.paper.event.player.PlayerInventorySlotChangeEvent;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.UUID;
+import java.util.function.Consumer;
+import org.bukkit.NamespacedKey;
+import org.bukkit.attribute.Attribute;
+import org.bukkit.enchantments.Enchantment;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.inventory.ClickType;
+import org.bukkit.event.inventory.InventoryAction;
+import org.bukkit.event.inventory.InventoryClickEvent;
+import org.bukkit.event.inventory.InventoryCreativeEvent;
+import org.bukkit.event.inventory.InventoryDragEvent;
+import org.bukkit.event.inventory.InventoryType;
+import org.bukkit.inventory.EquipmentSlot;
+import org.bukkit.inventory.Inventory;
+import org.bukkit.inventory.InventoryView;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.PlayerInventory;
+import org.bukkit.persistence.PersistentDataType;
+
+/** Server-thread equipment bridge. The scheduler must defer, never execute inline. */
+public final class EquipmentSessionEvents implements Listener, AutoCloseable {
+    private final EquipmentSessions sessions;
+    private final Consumer<Runnable> nextTick;
+    private final Consumer<EquipmentSessions.Failure> diagnostics;
+    private final CharacterSheets sheets = new CharacterSheets();
+    private SessionControls controls = new SessionControls();
+    private static final class Intent { boolean started; }
+    private final Map<UUID, Intent> swaps = new HashMap<>();
+    private final Map<UUID, UUID> observed = new HashMap<>();
+    private final Map<UUID, Object> queued = new HashMap<>();
+    private final Set<UUID> writing = new HashSet<>();
+    private final Map<UUID, BoxMove> moves = new HashMap<>();
+    private static final class BoxMove {
+        final Player player;
+        final InventoryView view;
+        final EquipmentSessions.Active active;
+        final ItemStack box;
+        final ItemStack control;
+        boolean issued;
+        boolean placing;
+        BoxMove(Player player, InventoryView view, EquipmentSessions.Active active, ItemStack box) {
+            this.player = player; this.view = view; this.active = active; this.box = box.clone();
+            control = new ItemStack(org.bukkit.Material.GRAY_DYE);
+            var meta = control.getItemMeta();
+            meta.displayName(net.kyori.adventure.text.Component.text("Move Fantasy Storage Box"));
+            meta.setMaxStackSize(1);
+            var data = meta.getPersistentDataContainer();
+            data.set(new NamespacedKey("fantasystick", "control_move_version"), PersistentDataType.INTEGER, 1);
+            data.set(new NamespacedKey("fantasystick", "control_move_owner"), PersistentDataType.STRING, active.player().toString());
+            data.set(new NamespacedKey("fantasystick", "control_move_session"), PersistentDataType.STRING, active.session().toString());
+            data.set(new NamespacedKey("fantasystick", "control_move_token"), PersistentDataType.STRING, UUID.randomUUID().toString());
+            control.setItemMeta(meta);
+        }
+    }
+    private boolean closed;
+    private Consumer<ControlInput> inputs = ignored -> { };
+    private record Draw(Player player, ItemStack item, EquipmentSessions.SelectedControl selected) { }
+    private final Map<UUID, Draw> draws = new HashMap<>();
+
+    public EquipmentSessionEvents(EquipmentSessions sessions, Consumer<Runnable> nextTick) {
+        this(sessions, nextTick, failure -> System.getLogger(EquipmentSessionEvents.class.getName())
+            .log(System.Logger.Level.WARNING, "Equipment event failure for " + failure.player(), failure.cause()));
+    }
+
+    /** Diagnostics report contained scheduler failures and possibly exposed drop outcomes; never throw. */
+    public EquipmentSessionEvents(EquipmentSessions sessions, Consumer<Runnable> nextTick,
+                                  Consumer<EquipmentSessions.Failure> diagnostics) {
+        this.sessions = Objects.requireNonNull(sessions);
+        this.nextTick = Objects.requireNonNull(nextTick);
+        this.diagnostics = Objects.requireNonNull(diagnostics);
+        sessions.attachCursorCustody(this::cancelCustody);
+    }
+
+    /** Install before registration so extensible controls keep the same structural containment catalogue. */
+    public void attachAbilityRegistry(games.dmg.fantasystick.ability.AbilityRegistry registry) {
+        if (closed || !draws.isEmpty()) throw new IllegalStateException("Input handling already started");
+        controls = new SessionControls(Objects.requireNonNull(registry));
+    }
+
+    /** The input recipient belongs to this plugin; it does not authorize vanilla item use. */
+    public EquipmentSessionEvents(EquipmentSessions sessions, Consumer<Runnable> nextTick,
+                                  Consumer<EquipmentSessions.Failure> diagnostics, Consumer<ControlInput> inputs) {
+        this(sessions, nextTick, diagnostics);
+        this.inputs = Objects.requireNonNull(inputs);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void death(org.bukkit.event.entity.PlayerDeathEvent event) {
+        if (closed) return;
+        UUID owner = event.getEntity().getUniqueId();
+        queued.remove(owner);
+        swaps.remove(owner);
+        sessions.cancelEntry(owner);
+        boolean reserved = writing.add(owner);
+        try { sessions.defeat(event); }
+        finally { if (reserved) writing.remove(owner); }
+    }
+
+    // Only actual ordinary death invalidates context; preserve a prior cancellation entirely.
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void ordinaryDeath(org.bukkit.event.entity.PlayerDeathEvent event) {
+        if (closed) return;
+        invalidate(event.getEntity());
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void respawn(org.bukkit.event.player.PlayerRespawnEvent event) {
+        if (!closed) invalidate(event.getPlayer());
+    }
+
+    private void invalidate(Player player) {
+        UUID owner = player.getUniqueId();
+        queued.remove(owner);
+        swaps.remove(owner);
+        observed.put(owner, sheets.identify(player.getInventory().getItemInOffHand()).orElse(null));
+        sessions.invalidateContext(owner);
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void changed(PlayerInventorySlotChangeEvent event) { reconcile(event.getPlayer()); }
+
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void join(org.bukkit.event.player.PlayerJoinEvent event) {
+        if (closed) return;
+        var player = event.getPlayer();
+        UUID owner = player.getUniqueId();
+        queued.remove(owner);
+        observed.put(owner, sheets.identify(player.getInventory().getItemInOffHand()).orElse(null));
+        sessions.arrive(player);
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void quit(org.bukkit.event.player.PlayerQuitEvent event) {
+        var player = event.getPlayer();
+        UUID owner = player.getUniqueId();
+        queued.remove(owner);
+        swaps.remove(owner);
+        boolean reserved = writing.add(owner);
+        try { sessions.invalidateContext(owner); sessions.exit(player); }
+        finally { if (reserved) writing.remove(owner); observed.remove(owner); }
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void swap(org.bukkit.event.player.PlayerSwapHandItemsEvent event) {
+        Player player = event.getPlayer();
+        int slot = player.getInventory().getHeldItemSlot();
+        if (reservedExchange(player, slot)) {
+            event.setCancelled(true);
+            // Purpur 2618 snapshots the proposed hand stacks BEFORE dispatch. Never let its
+            // continuation write the old fantasy control over the restored ordinary stack.
+            if (Objects.equals(event.getMainHandItem(), player.getInventory().getItemInOffHand())
+                    && Objects.equals(event.getOffHandItem(), player.getInventory().getItem(slot))) {
+                exchange(player, slot, null);
+            }
+        } else if (special(event.getMainHandItem()) || special(event.getOffHandItem())
+                || special(player.getInventory().getItemInMainHand()) || special(player.getInventory().getItemInOffHand())) event.setCancelled(true);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void click(InventoryClickEvent event) {
+        if (!(event.getWhoClicked() instanceof Player player)) return;
+        if (ownInventory(player, event.getClickedInventory()) && event.getSlot() == 40
+                && (event.getClick() == ClickType.DROP || event.getClick() == ClickType.CONTROL_DROP)
+                && (event.getAction() == InventoryAction.DROP_ONE_SLOT || event.getAction() == InventoryAction.DROP_ALL_SLOT)
+                && sheets.identify(event.getCurrentItem()).isPresent()) {
+            // LivingEntity.drop's cancelled-source fallback adds to inventory, not the offhand;
+            // at full capacity it discards leftovers. Keep custody until detached insertion succeeds.
+            event.setCancelled(true);
+            dropSheet(player, event.getView(), event.getClick() == ClickType.CONTROL_DROP);
+            return;
+        }
+        int slot = -1;
+        if (event.getClickedInventory() instanceof PlayerInventory) {
+            if (event.getSlot() == 40 && event.getClick() == ClickType.NUMBER_KEY) slot = event.getHotbarButton();
+            else if (event.getClick() == ClickType.SWAP_OFFHAND) slot = event.getSlot();
+        }
+        if (event.getAction() == InventoryAction.HOTBAR_SWAP && reservedExchange(player, slot)) {
+            event.setCancelled(true);
+            exchange(player, slot, event.getView());
+            return;
+        }
+        if (pickupClaim(event.getCursor(), "control_move_") && !cursorIndependent(event)) {
+            event.setCancelled(true);
+            if (!(event instanceof InventoryCreativeEvent)
+                    && (event.getClick() == ClickType.LEFT || event.getClick() == ClickType.RIGHT)) {
+                if (event.getRawSlot() == -999) cancelMove(player.getUniqueId());
+                else if (ownInventory(player, event.getClickedInventory()) && event.getSlot() >= 9 && event.getSlot() < 36
+                        && (event.getAction() == InventoryAction.PLACE_ALL || event.getAction() == InventoryAction.PLACE_ONE
+                            || event.getAction() == InventoryAction.SWAP_WITH_CURSOR)) {
+                    placeMove(player, event.getView(), event.getSlot(), event.getCursor());
+                }
+            }
+            return;
+        }
+        if (box(event.getCurrentItem()) != null && empty(event.getCursor())
+                && ownInventory(player, event.getClickedInventory()) && event.getSlot() >= 9 && event.getSlot() < 36
+                && !(event instanceof InventoryCreativeEvent)
+                && (event.getClick() == ClickType.LEFT || event.getClick() == ClickType.RIGHT)
+                && (event.getAction() == InventoryAction.PICKUP_ALL || event.getAction() == InventoryAction.PICKUP_HALF)) {
+            event.setCancelled(true);
+            beginMove(player, event.getView(), event.getCurrentItem());
+            return;
+        }
+        if (blockedClick(player, event)) event.setCancelled(true);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void recipeBook(com.destroystokyo.paper.event.player.PlayerRecipeBookClickEvent event) {
+        var player = event.getPlayer();
+        // Native recipe-book placement can pull directly from the hotbar without a click
+        // event. Exact recipe ingredients also bypass vanilla's custom-name exclusion.
+        if (Arrays.stream(player.getOpenInventory().getTopInventory().getContents()).anyMatch(this::special)) {
+            event.setCancelled(true); return;
+        }
+        var recipe = player.getServer().getRecipe(event.getRecipe());
+        java.util.Collection<org.bukkit.inventory.RecipeChoice> choices;
+        if (recipe instanceof org.bukkit.inventory.ShapedRecipe shaped) choices = shaped.getChoiceMap().values();
+        else if (recipe instanceof org.bukkit.inventory.ShapelessRecipe shapeless) choices = shapeless.getChoiceList();
+        else if (recipe instanceof org.bukkit.inventory.CookingRecipe<?> cooking) choices = java.util.List.of(cooking.getInputChoice());
+        else return; // Other recipe types do not use these native auto-fill routes.
+        for (var item : player.getInventory().getStorageContents()) {
+            if (!special(item)) continue;
+            boolean ordinaryEligible = net.minecraft.world.entity.player.Inventory.isUsableForCrafting(
+                org.bukkit.craftbukkit.inventory.CraftItemStack.asNMSCopy(item));
+            if (choices.stream().filter(Objects::nonNull).anyMatch(choice -> choice.test(item)
+                    && (ordinaryEligible || choice instanceof org.bukkit.inventory.RecipeChoice.ExactChoice))) {
+                event.setCancelled(true); return;
+            }
+        }
+    }
+
+    private static boolean cursorIndependent(InventoryClickEvent event) {
+        return switch (event.getAction()) {
+            case DROP_ONE_SLOT, DROP_ALL_SLOT, MOVE_TO_OTHER_INVENTORY, HOTBAR_SWAP -> true;
+            default -> false;
+        };
+    }
+
+    private boolean blockedClick(Player player, InventoryClickEvent event) {
+        var current = event.getCurrentItem();
+        var cursor = pickupClaim(event.getCursor(), "control_move_") && cursorIndependent(event) ? null : event.getCursor();
+        var inventory = event.getClickedInventory();
+        int slot = event.getSlot();
+        if (event.getSlotType() == InventoryType.SlotType.RESULT
+                && Arrays.stream(event.getView().getTopInventory().getContents()).anyMatch(this::special)) return true;
+        if (control(current) || control(cursor)) return true;
+        if (event instanceof InventoryCreativeEvent && (special(current) || special(cursor))) return true;
+        // Native pickup swaps the active sheet onto the cursor and its own box into offhand.
+        // Reconciliation then restores into that freed offhand, without needing main capacity.
+        if (ownInventory(player, inventory) && slot == 40
+                && event.getAction() == InventoryAction.SWAP_WITH_CURSOR
+                && (event.getClick() == ClickType.LEFT || event.getClick() == ClickType.RIGHT)) {
+            var active = sessions.active(player.getUniqueId()).orElse(null);
+            var heldBox = box(cursor);
+            if (active != null && heldBox != null && heldBox.owner().equals(active.player())
+                    && heldBox.session().equals(active.session())
+                    && sheets.identify(current).filter(active.character()::equals).isPresent()) return false;
+        }
+        if (event.getClick() == ClickType.NUMBER_KEY || event.getClick() == ClickType.SWAP_OFFHAND) {
+            int source = event.getClick() == ClickType.SWAP_OFFHAND ? 40 : event.getHotbarButton();
+            if (source < 0) return false;
+            var hidden = player.getInventory().getItem(source);
+            return special(current) || special(hidden)
+                || destinationBlocked(player, inventory, slot, hidden)
+                || destinationBlocked(player, player.getInventory(), source, current);
+        }
+        // Normal pickup is exclusively the bound move-control path above. No unsupported
+        // action may fall back to vanilla taking the genuine box onto the cursor.
+        if (box(current) != null) return true;
+        if (box(cursor) != null && destinationBlocked(player, inventory, slot, cursor)) return true;
+        if (event.getAction() == InventoryAction.COLLECT_TO_CURSOR && !empty(cursor)) {
+            for (var item : event.getView().getTopInventory().getContents()) if (special(item) && item.isSimilar(cursor)) return true;
+            for (var item : player.getInventory().getContents()) if (special(item) && item.isSimilar(cursor)) return true;
+        }
+        if (!active(player)) return false;
+        if (ownInventory(player, inventory) && slot >= 0 && slot < 9) return true;
+        if (event.isShiftClick() && !empty(current)) {
+            if (ownInventory(player, inventory) && event.getView().getType() == InventoryType.CRAFTING && slot >= 9 && slot < 36) {
+                // Native InventoryMenu tries armor first, otherwise routes main -> hotbar.
+                return !(cosmetic(current) && !forbiddenEquip(current) && empty(player.getInventory().getHelmet()));
+            }
+            if (!ownInventory(player, inventory) && mainCapacity(player, current) < current.getAmount()) return true;
+        }
+        return destinationBlocked(player, inventory, slot, cursor);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void drag(InventoryDragEvent event) {
+        if (!(event.getWhoClicked() instanceof Player player)) return;
+        if (control(event.getOldCursor())) {
+            event.setCancelled(true);
+            if (pickupClaim(event.getOldCursor(), "control_move_") && event.getNewItems().size() == 1) {
+                int raw = event.getNewItems().keySet().iterator().next();
+                int slot = event.getView().convertSlot(raw);
+                if (ownInventory(player, event.getView().getInventory(raw)) && slot >= 9 && slot < 36) {
+                    // QUICK_CRAFT temporarily debits carried before event dispatch; DENY
+                    // restores it afterwards. Confirm that live cursor only in the deferred task.
+                    placeMove(player, event.getView(), slot, event.getOldCursor());
+                }
+            }
+            return;
+        }
+        for (var entry : event.getNewItems().entrySet()) {
+            int raw = entry.getKey();
+            if (special(event.getView().getItem(raw)) || destinationBlocked(player,
+                    event.getView().getInventory(raw), event.getView().convertSlot(raw), entry.getValue())) {
+                event.setCancelled(true); return;
+            }
+        }
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void drop(org.bukkit.event.player.PlayerDropItemEvent event) {
+        if (special(event.getItemDrop().getItemStack())) event.setCancelled(true);
+    }
+
+    // isCancelled() is only the block decision on this event. Denying item use must
+    // also run for RIGHT_CLICK_AIR / an existing block veto, without changing that veto.
+    @EventHandler(priority = EventPriority.HIGHEST)
+    public void use(org.bukkit.event.player.PlayerInteractEvent event) {
+        boolean allowed = event.useItemInHand() != org.bukkit.event.Event.Result.DENY;
+        if (special(event.getItem()) || active(event.getPlayer()) && forbiddenEquip(event.getItem())) {
+            // Do not veto an unrelated door/chest interaction or undo another plugin's block veto.
+            event.setUseItemInHand(org.bukkit.event.Event.Result.DENY);
+        }
+        if (allowed && event.getHand() == EquipmentSlot.HAND && (event.getAction() == org.bukkit.event.block.Action.RIGHT_CLICK_AIR
+                || event.getAction() == org.bukkit.event.block.Action.RIGHT_CLICK_BLOCK)) {
+            var selected = sessions.selectedControl(event.getPlayer(), event.getItem()).orElse(null);
+            if (selected != null && useGesture(selected)) emit(event.getPlayer(), event.getItem(), selected,
+                ControlInput.Gesture.USE, null, 0, 0);
+            else if (selected != null && selected.ability().equals("longbow")) beginDraw(event.getPlayer(), event.getItem(), selected);
+        }
+    }
+
+    private void beginDraw(Player player, ItemStack item, EquipmentSessions.SelectedControl selected) {
+        UUID owner = player.getUniqueId();
+        if (closed || draws.containsKey(owner) || player.hasActiveItem()) return;
+        var draw = new Draw(player, item.clone(), selected);
+        draws.put(owner, draw);
+        try {
+            // Keep the native bow animation/timing, without BowItem.use's ammunition lookup.
+            player.startUsingItem(EquipmentSlot.HAND);
+            if (closed || draws.get(owner) != draw || !sessions.selectedControl(player, draw.item()).filter(selected::equals).isPresent()
+                    || !draw.item().equals(player.getActiveItem())) cancelDraw(draw);
+        } catch (RuntimeException failure) {
+            cancelDraw(draw);
+            report(owner, selected.session().session(), failure);
+        }
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST)
+    public void release(io.papermc.paper.event.player.PlayerStopUsingItemEvent event) {
+        var player = event.getPlayer();
+        UUID owner = player.getUniqueId();
+        var draw = draws.get(owner);
+        if (draw != null && draw.player() != player) draw = null;
+        if (draw != null) draws.remove(owner, draw); // One-use, before a native setter or recipient can reenter.
+        try {
+            boolean matching = draw != null && draw.item().equals(event.getItem())
+                && draw.item().equals(player.getActiveItem()) && event.getTicksHeldFor() >= 0;
+            // Purpur 2618 reloads LivingEntity.useItem AFTER this event, then calls releaseUsing.
+            // Clear it first: cancelling EntityShootBowEvent alone is too late to own ammo draw.
+            if (special(event.getItem()) && event.getItem().equals(player.getActiveItem())) player.clearActiveItem();
+            if (matching) emit(player, draw.item(), draw.selected(), ControlInput.Gesture.DRAW_RELEASE,
+                null, event.getTicksHeldFor(), 0);
+        } catch (RuntimeException failure) {
+            // Unknown native state is not a completed cast or authority to replay an input.
+            report(owner, draw == null ? null : draw.selected().session().session(), failure);
+        }
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void held(org.bukkit.event.player.PlayerItemHeldEvent event) {
+        var draw = draws.get(event.getPlayer().getUniqueId());
+        if (draw != null && draw.player() == event.getPlayer() && event.getPreviousSlot() != event.getNewSlot()) cancelDraw(draw);
+    }
+
+    private void cancelCustody(UUID owner) {
+        try { cancelMove(owner); }
+        finally {
+            var draw = draws.get(owner);
+            if (draw != null) cancelDraw(draw);
+        }
+    }
+
+    private void cancelDraw(Draw draw) {
+        draws.remove(draw.player().getUniqueId(), draw);
+        try {
+            if (draw.item().equals(draw.player().getActiveItem())) draw.player().clearActiveItem();
+        } catch (RuntimeException failure) {
+            report(draw.player().getUniqueId(), draw.selected().session().session(), failure);
+        }
+    }
+
+    private static boolean useGesture(EquipmentSessions.SelectedControl selected) {
+        return selected.slot() == 0 || selected.slot() >= 2
+            && !selected.ability().equals("great_sword") && !selected.ability().equals("longbow");
+    }
+
+    private void emit(Player player, ItemStack item, EquipmentSessions.SelectedControl selected,
+                      ControlInput.Gesture gesture, org.bukkit.entity.Entity target, int heldTicks, float strength) {
+        var captured = item.clone();
+        var kind = selected.slot() == 0 ? ControlInput.Kind.BOOK
+            : selected.slot() == 1 ? ControlInput.Kind.BASIC_ATTACK : ControlInput.Kind.ABILITY;
+        var input = new ControlInput(player, selected.session(), selected.slot(), selected.ability(), kind,
+            gesture, target, heldTicks, strength,
+            () -> !closed && sessions.selectedControl(player, captured).filter(selected::equals).isPresent());
+        if (!input.stillCurrent()) return;
+        try { inputs.accept(input); }
+        catch (RuntimeException failure) { report(player.getUniqueId(), selected.session().session(), failure); }
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void useEntity(org.bukkit.event.player.PlayerInteractEntityEvent event) {
+        var player = event.getPlayer();
+        var item = player.getInventory().getItem(event.getHand());
+        if (special(item)) event.setCancelled(true);
+        if (event.getHand() == EquipmentSlot.HAND) {
+            var selected = sessions.selectedControl(player, item).orElse(null);
+            if (selected != null && useGesture(selected)) emit(player, item, selected,
+                ControlInput.Gesture.USE, event.getRightClicked(), 0, 0);
+        }
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void attack(io.papermc.paper.event.player.PrePlayerAttackEntityEvent event) {
+        // The ability/basic-attack adapter owns intentional damage. Never also execute
+        // vanilla Player.attack with the icon's material, enchantments or attributes.
+        var player = event.getPlayer();
+        var item = player.getInventory().getItemInMainHand();
+        boolean willAttack = event.willAttack();
+        if (special(item)) event.setCancelled(true);
+        if (willAttack) {
+            var selected = sessions.selectedControl(player, item).orElse(null);
+            if (selected != null && (selected.slot() == 1 || selected.ability().equals("great_sword"))) {
+                emit(player, item, selected, ControlInput.Gesture.ATTACK, event.getAttacked(), 0, player.getAttackCooldown());
+            }
+        }
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void armorStand(org.bukkit.event.player.PlayerArmorStandManipulateEvent event) {
+        if (special(event.getPlayerItem()) || special(event.getArmorStandItem())) event.setCancelled(true);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void consume(org.bukkit.event.player.PlayerItemConsumeEvent event) {
+        if (special(event.getItem())) event.setCancelled(true);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void place(org.bukkit.event.block.BlockPlaceEvent event) {
+        if (special(event.getItemInHand())) event.setCancelled(true);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void transfer(org.bukkit.event.inventory.InventoryMoveItemEvent event) {
+        if (special(event.getItem())) event.setCancelled(true);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void attemptPickup(org.bukkit.event.player.PlayerAttemptPickupItemEvent event) {
+        if (pickupBlocked(event.getPlayer(), event.getItem().getItemStack(), event.getRemaining())) event.setCancelled(true);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void pickup(org.bukkit.event.entity.EntityPickupItemEvent event) {
+        if (pickupBlocked(event.getEntity(), event.getItem().getItemStack(), event.getRemaining())) event.setCancelled(true);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void inventoryPickup(org.bukkit.event.inventory.InventoryPickupItemEvent event) {
+        var item = event.getItem().getItemStack();
+        if (pickupClaim(item, "control_") || pickupClaim(item, "storage_")) event.setCancelled(true);
+    }
+
+    private boolean pickupBlocked(org.bukkit.entity.LivingEntity entity, ItemStack item, int remaining) {
+        if (pickupClaim(item, "control_")) return true;
+        if (!pickupClaim(item, "storage_")) return false;
+        var box = box(item);
+        // ItemEntity.playerTouch temporarily narrows the stack to canHold before entity
+        // pickup dispatch, then restores count + remaining before Inventory.add. Never
+        // mistake a partial/oversized claim for one genuine nonstackable box.
+        if (box == null || item.getAmount() != 1 || item.getMaxStackSize() != 1 || remaining != 0
+                || !item.getPersistentDataContainer().has(BOX_SLOTS, PersistentDataType.INTEGER_ARRAY)
+                || !Arrays.equals(BOX_SLOT_MAP, item.getPersistentDataContainer().get(BOX_SLOTS, PersistentDataType.INTEGER_ARRAY))
+                || !(entity instanceof Player player) || !box.owner().equals(player.getUniqueId())
+                || player.getInventory().getMaxStackSize() < 1) return true;
+        // Purpur 2618 Inventory.add(-1, stack): factory nonstackable boxes cannot merge;
+        // getFreeSlot scans 0..35, NOT the selected slot or only main storage. Read only:
+        // leave native insertion to the caller, and never invent a recovery destination.
+        for (int slot = 0; slot < 36; slot++) {
+            if (empty(player.getInventory().getItem(slot))) return slot < 9;
+        }
+        return true;
+    }
+
+    // Pickup-only fail-closed claims: malformed/future metadata must not turn protected
+    // remnants into ordinary loot. This grants no session/recovery authority and does not
+    // change the existing cursor/click policy or EquipmentStorage's payload validation.
+    private static boolean pickupClaim(ItemStack item, String prefix) {
+        if (empty(item)) return false;
+        return item.getPersistentDataContainer().getKeys().stream()
+            .anyMatch(key -> key.getNamespace().equals("fantasystick") && key.getKey().startsWith(prefix));
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void launch(com.destroystokyo.paper.event.player.PlayerLaunchProjectileEvent event) {
+        if (special(event.getItemStack())) event.setCancelled(true);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void shoot(org.bukkit.event.entity.EntityShootBowEvent event) {
+        if (special(event.getBow()) || special(event.getConsumable())) event.setCancelled(true);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void dispense(org.bukkit.event.block.BlockDispenseArmorEvent event) {
+        if (special(event.getItem()) || event.getTargetEntity() instanceof Player player
+                && active(player) && (!cosmetic(event.getItem()) || forbiddenEquip(event.getItem()))) event.setCancelled(true);
+    }
+
+    private static boolean forbiddenEquip(ItemStack item) {
+        if (empty(item)) return false;
+        var equippable = item.getData(io.papermc.paper.datacomponent.DataComponentTypes.EQUIPPABLE);
+        if (equippable == null) return false;
+        return switch (equippable.slot()) {
+            case HEAD -> !cosmetic(item);
+            case CHEST, LEGS, FEET -> true;
+            default -> false;
+        };
+    }
+
+    private boolean destinationBlocked(Player player, Inventory inventory, int slot, ItemStack item) {
+        if (control(item)) return true;
+        var box = box(item);
+        if (box != null) return !ownerMain(player, inventory, slot, box.owner());
+        if (!active(player) || !ownInventory(player, inventory)) return false;
+        if (slot >= 0 && slot < 9) return true;
+        return !empty(item) && slot >= 36 && slot <= 39 && (slot != 39 || !cosmetic(item));
+    }
+
+    private boolean active(Player player) { return sessions.active(player.getUniqueId()).isPresent(); }
+    private boolean control(ItemStack item) { return pickupClaim(item, "control_move_") || controls.identify(item).isPresent(); }
+    private boolean special(ItemStack item) { return control(item) || box(item) != null; }
+    private static boolean ownInventory(Player player, Inventory inventory) {
+        return inventory instanceof PlayerInventory && inventory.equals(player.getInventory());
+    }
+    private static boolean ownerMain(Player player, Inventory inventory, int slot, UUID owner) {
+        return owner.equals(player.getUniqueId()) && ownInventory(player, inventory) && slot >= 9 && slot < 36;
+    }
+    private static int mainCapacity(Player player, ItemStack item) {
+        int capacity = 0;
+        for (int slot = 9; slot < 36; slot++) {
+            var current = player.getInventory().getItem(slot);
+            if (empty(current)) capacity += item.getMaxStackSize();
+            else if (current.isSimilar(item)) capacity += Math.max(0, item.getMaxStackSize() - current.getAmount());
+        }
+        return capacity;
+    }
+
+    // Identity only, not restoration validation. The slot map and actual contents remain
+    // exclusively EquipmentStorage's responsibility. Names never confer protected identity.
+    private record Box(UUID owner, UUID session) { }
+    private static final NamespacedKey BOX_VERSION = new NamespacedKey("fantasystick", "storage_version");
+    private static final NamespacedKey BOX_OWNER = new NamespacedKey("fantasystick", "storage_owner_id");
+    private static final NamespacedKey BOX_SESSION = new NamespacedKey("fantasystick", "storage_session_id");
+    private static final NamespacedKey BOX_SLOTS = new NamespacedKey("fantasystick", "storage_slots");
+    private static final int[] BOX_SLOT_MAP = {0, 1, 2, 3, 4, 5, 6, 7, 8, 36, 37, 38, 39};
+    private static Box box(ItemStack item) {
+        if (empty(item) || !item.getType().name().endsWith("SHULKER_BOX")) return null;
+        var data = item.getPersistentDataContainer();
+        if (!data.has(BOX_VERSION, PersistentDataType.INTEGER) || !data.has(BOX_OWNER, PersistentDataType.STRING)
+                || !data.has(BOX_SESSION, PersistentDataType.STRING)
+                || !Integer.valueOf(1).equals(data.get(BOX_VERSION, PersistentDataType.INTEGER))) return null;
+        String owner = data.get(BOX_OWNER, PersistentDataType.STRING);
+        String session = data.get(BOX_SESSION, PersistentDataType.STRING);
+        if (owner == null || session == null) return null;
+        try {
+            UUID ownerId = UUID.fromString(owner), sessionId = UUID.fromString(session);
+            return ownerId.toString().equals(owner) && sessionId.toString().equals(session) ? new Box(ownerId, sessionId) : null;
+        } catch (IllegalArgumentException invalid) { return null; }
+    }
+    private static boolean cosmetic(ItemStack item) {
+        if (empty(item)) return false;
+        boolean head = switch (item.getType()) {
+            case PLAYER_HEAD, ZOMBIE_HEAD, CREEPER_HEAD, DRAGON_HEAD, PIGLIN_HEAD,
+                 SKELETON_SKULL, WITHER_SKELETON_SKULL, CARVED_PUMPKIN -> true;
+            default -> false;
+        };
+        if (!head) return false;
+        var modifiers = item.getAttributeModifiers(EquipmentSlot.HEAD);
+        if (modifiers != null && (modifiers.containsKey(Attribute.ARMOR) || modifiers.containsKey(Attribute.ARMOR_TOUGHNESS))) return false;
+        return !item.containsEnchantment(Enchantment.PROTECTION) && !item.containsEnchantment(Enchantment.FIRE_PROTECTION)
+            && !item.containsEnchantment(Enchantment.BLAST_PROTECTION) && !item.containsEnchantment(Enchantment.PROJECTILE_PROTECTION)
+            && !item.containsEnchantment(Enchantment.FEATHER_FALLING);
+    }
+    private static boolean empty(ItemStack item) { return item == null || item.isEmpty(); }
+
+    private void beginMove(Player player, InventoryView view, ItemStack box) {
+        UUID owner = player.getUniqueId();
+        var active = sessions.active(owner).orElse(null);
+        if (closed || active == null || writing.contains(owner) || moves.containsKey(owner) || swaps.containsKey(owner)
+                || box.getAmount() != 1 || box.getMaxStackSize() != 1
+                || !new Box(owner, active.session()).equals(box(box))) return;
+        var move = new BoxMove(player, view, active, box);
+        moves.put(owner, move);
+        try {
+            nextTick.accept(() -> {
+                if (moves.get(owner) != move || move.issued) return;
+                writing.add(owner);
+                try {
+                    if (!moveCurrent(move) || !empty(player.getItemOnCursor()) || source(move) < 0) {
+                        cancelMove(move); return;
+                    }
+                    move.issued = true;
+                    player.setItemOnCursor(move.control.clone());
+                    if (!issuedCurrent(move)) { cancelMove(move); return; }
+                    player.updateInventory();
+                    if (!issuedCurrent(move)) cancelMove(move);
+                } catch (RuntimeException failure) { cancelMove(move); report(owner, active.session(), failure); }
+                finally { writing.remove(owner); }
+            });
+        } catch (RuntimeException failure) { cancelMove(move); report(owner, active.session(), failure); }
+    }
+
+    private void placeMove(Player player, InventoryView view, int destination, ItemStack presented) {
+        UUID owner = player.getUniqueId();
+        var move = moves.get(owner);
+        if (move == null || move.player != player || move.view != view || !move.issued || move.placing
+                || writing.contains(owner) || !moveCurrent(move) || !move.control.equals(presented)) return;
+        var displaced = copy(player.getInventory().getItem(destination));
+        if (special(displaced) && !move.box.equals(displaced)) return;
+        move.placing = true;
+        try {
+            nextTick.accept(() -> {
+                if (moves.get(owner) != move || !move.placing) {
+                    // A cancelled native drag can restore its old harmless carried token AFTER
+                    // a reentrant close. Revoke/clean only this issued token, never a replacement.
+                    cancelMove(move); return;
+                }
+                move.placing = false; // One-use callback, including native exceptions.
+                writing.add(owner);
+                try {
+                    int source = source(move);
+                    if (!moveCurrent(move) || source < 0 || !move.control.equals(player.getItemOnCursor())
+                            || !Objects.equals(displaced, copy(player.getInventory().getItem(destination)))) return;
+                    // Cursor setters can synchronously reenter close/exit or change either slot.
+                    // Remove the harmless control FIRST, then revalidate before touching gear.
+                    player.setItemOnCursor(null);
+                    if (!moveCurrent(move) || !empty(player.getItemOnCursor()) || source(move) != source
+                            || !Objects.equals(displaced, copy(player.getInventory().getItem(destination)))) return;
+                    if (source != destination) {
+                        NativeMainInventorySwap.swap(player.getInventory(), source, destination);
+                    }
+                    moves.remove(owner, move);
+                    player.updateInventory(); // No planned writes after this reentrant boundary.
+                } catch (RuntimeException failure) { report(owner, move.active.session(), failure); }
+                finally { cancelMove(move); writing.remove(owner); reconcile(player); }
+            });
+        } catch (RuntimeException failure) { cancelMove(move); report(owner, move.active.session(), failure); }
+    }
+
+    private boolean issuedCurrent(BoxMove move) {
+        return moveCurrent(move) && move.control.equals(move.player.getItemOnCursor()) && source(move) >= 0;
+    }
+
+    private boolean moveCurrent(BoxMove move) {
+        return !closed && moves.get(move.active.player()) == move && move.player.isOnline()
+            && move.player.getOpenInventory() == move.view
+            && sessions.active(move.active.player()).filter(move.active::equals).isPresent();
+    }
+
+    /** Follow the unique current box, not its index before a sorting operation. */
+    private int source(BoxMove move) {
+        int found = -1;
+        var expected = new Box(move.active.player(), move.active.session());
+        var inventory = move.player.getInventory();
+        for (int slot = 0; slot < inventory.getSize(); slot++) {
+            var item = inventory.getItem(slot);
+            if (!expected.equals(box(item))) continue;
+            if (found != -1 || slot < 9 || slot >= 36 || !move.box.equals(item)) return -1;
+            found = slot;
+        }
+        return expected.equals(box(move.player.getItemOnCursor())) ? -1 : found;
+    }
+
+    private void cancelMove(UUID owner) {
+        var move = moves.get(owner);
+        if (move != null) cancelMove(move);
+    }
+
+    private void cancelMove(BoxMove move) {
+        UUID owner = move.active.player();
+        moves.remove(owner, move); // Invalidate before a cursor setter can reenter; never revoke a replacement.
+        if (!move.issued) return;
+        boolean reserved = writing.add(owner);
+        try {
+            if (move.control.equals(move.player.getItemOnCursor())) move.player.setItemOnCursor(null);
+        } catch (RuntimeException failure) { report(owner, move.active.session(), failure); }
+        finally { if (reserved) writing.remove(owner); }
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void close(org.bukkit.event.inventory.InventoryCloseEvent event) {
+        UUID owner = event.getPlayer().getUniqueId();
+        cancelCustody(owner);
+        swaps.remove(owner);
+        sessions.invalidateTail(owner);
+    }
+
+    private boolean reservedExchange(Player player, int slot) {
+        if (slot < 0 || slot > 8) return false;
+        var active = sessions.active(player.getUniqueId()).orElse(null);
+        return active != null && sheets.identify(player.getInventory().getItemInOffHand()).filter(active.character()::equals).isPresent()
+            && controls.owned(player.getInventory().getItem(slot), active.player(), active.session());
+    }
+
+    private void exchange(Player player, int slot, InventoryView view) {
+        UUID owner = player.getUniqueId();
+        if (closed || writing.contains(owner) || swaps.containsKey(owner)) return;
+        var active = sessions.active(owner).orElseThrow();
+        var before = snapshot(player);
+        var cursor = copy(player.getItemOnCursor());
+        var heldBox = box(cursor);
+        // A successful restore consumes exactly this own cursor box, replacing it with
+        // the pre-restore head (or empty). Do not also accept the old box afterwards.
+        var move = moves.get(owner);
+        var restoredCursor = move != null && move.issued && move.control.equals(cursor) ? null
+            : heldBox != null && heldBox.owner().equals(owner) && heldBox.session().equals(active.session())
+                ? copy(before[39]) : cursor;
+        var token = new Intent();
+        submit(owner, active.session(), token, () -> {
+            if (closed || !player.isOnline()
+                    || !sessions.active(owner).filter(active::equals).isPresent()
+                    || !Arrays.equals(before, snapshot(player))
+                    || !Objects.equals(cursor, copy(player.getItemOnCursor()))
+                    || (view != null ? player.getOpenInventory() != view : player.getInventory().getHeldItemSlot() != slot)) return;
+            queued.remove(owner);
+            writing.add(owner);
+            try {
+                if (sessions.exit(player) != EquipmentStorage.RestoreResult.RESTORED) return;
+                // Only this still-current, contained hotbar/offhand request is replayed.
+                // Ordinary cursor/slot moves are already complete and never enter this path.
+                if (closed || swaps.get(owner) != token || !Objects.equals(before[40], copy(player.getInventory().getItemInOffHand()))
+                        || !Objects.equals(restoredCursor, copy(player.getItemOnCursor()))
+                        || view != null && player.getOpenInventory() != view) return;
+                var ordinary = copy(player.getInventory().getItem(slot));
+                var sheet = copy(player.getInventory().getItemInOffHand());
+                player.getInventory().setItem(slot, sheet);
+                player.getInventory().setItemInOffHand(ordinary);
+                // An actual exit happened even if the restored ordinary stack is a sheet
+                // for the same character. The coordinator must check the next entry.
+                observed.put(owner, null);
+                player.updateInventory();
+            } finally { writing.remove(owner); }
+            reconcile(player);
+        });
+    }
+
+    private void dropSheet(Player player, InventoryView view, boolean all) {
+        UUID owner = player.getUniqueId();
+        if (closed || writing.contains(owner) || swaps.containsKey(owner)) return;
+        var active = sessions.active(owner);
+        var marker = EquipmentSessionMarker.read(player);
+        var before = snapshot(player);
+        var cursor = copy(player.getItemOnCursor());
+        var token = new Intent();
+        java.util.function.BooleanSupplier current = () -> !closed && swaps.get(owner) == token && player.isOnline()
+            && EquipmentSessionMarker.read(player).equals(marker) && sessions.active(owner).equals(active) && player.getOpenInventory() == view
+            && Arrays.equals(before, snapshot(player)) && Objects.equals(cursor, copy(player.getItemOnCursor()));
+        UUID session = active.map(EquipmentSessions.Active::session).orElse(null);
+        submit(owner, session, token, () -> {
+            if (!current.getAsBoolean()) return;
+            writing.add(owner);
+            try {
+                if (empty(before[40]) || before[40].getAmount() > before[40].getMaxStackSize()) {
+                    throw new IllegalArgumentException("Offhand sheet references exceed the native stack limit");
+                }
+                var selected = before[40].clone();
+                selected.setAmount(all ? selected.getAmount() : 1);
+                var result = new PlayerSheetDrops(player, event -> player.getServer().getPluginManager().callEvent(event))
+                    .dropReferences(selected, current);
+                if (result == ManualDropDelivery.Status.COMPLETE && current.getAsBoolean()) {
+                    int remaining = before[40].getAmount() - selected.getAmount();
+                    if (remaining > 0) {
+                        var retained = before[40].clone();
+                        retained.setAmount(remaining);
+                        player.getInventory().setItemInOffHand(retained);
+                    } else {
+                        queued.remove(owner);
+                        sessions.cancelEntry(owner);
+                        player.getInventory().setItemInOffHand(null);
+                        observed.put(owner, null);
+                        sessions.exit(player);
+                    }
+                    player.updateInventory();
+                } else if (result == ManualDropDelivery.Status.UNCONFIRMED || result == ManualDropDelivery.Status.COMPLETE) {
+                    report(owner, session, new IllegalStateException(
+                        "Sheet drop outcome is uncertain; retained current inventory, never replayed or charged stale contents"));
+                }
+            } finally { writing.remove(owner); reconcile(player); }
+        });
+    }
+
+    private void submit(UUID owner, UUID session, Intent token, Runnable action) {
+        swaps.put(owner, token);
+        try {
+            nextTick.accept(() -> {
+                if (swaps.get(owner) != token || token.started) return;
+                token.started = true;
+                try { action.run(); }
+                catch (RuntimeException failure) { report(owner, session, failure); }
+                finally { swaps.remove(owner, token); }
+            });
+        } catch (RuntimeException failure) { swaps.remove(owner, token); report(owner, session, failure); }
+    }
+
+    private void report(UUID owner, UUID session, Throwable failure) {
+        try { diagnostics.accept(new EquipmentSessions.Failure(owner, session, failure)); }
+        catch (RuntimeException ignored) { /* Diagnostics cannot authorize retries or abort custody cleanup. */ }
+    }
+
+    private static ItemStack copy(ItemStack item) { return item == null || item.isEmpty() ? null : item.clone(); }
+    private static ItemStack[] snapshot(Player player) {
+        return Arrays.stream(player.getInventory().getContents()).map(EquipmentSessionEvents::copy).toArray(ItemStack[]::new);
+    }
+
+    private void reconcile(Player player) {
+        UUID owner = player.getUniqueId();
+        var draw = draws.get(owner);
+        if (draw != null && draw.player() == player
+                && !sessions.selectedControl(player, draw.item()).filter(draw.selected()::equals).isPresent()) cancelDraw(draw);
+        if (closed || writing.contains(owner) || !player.isOnline()) return;
+        var marker = EquipmentSessionMarker.read(player).orElse(null);
+        if (marker != null && (marker.phase() == EquipmentSessionMarker.Phase.PACKING
+                || marker.phase() == EquipmentSessionMarker.Phase.RESTORING)) return;
+        UUID character = sheets.identify(player.getInventory().getItemInOffHand()).orElse(null);
+        var active = sessions.active(owner).orElse(null);
+        boolean initial = !observed.containsKey(owner);
+        boolean changed = initial || !Objects.equals(observed.get(owner), character);
+        observed.put(owner, character);
+        // A terminal recovery/client-sync observation is not a fresh offhand move.
+        if (initial && active == null && marker != null) return;
+        if (active != null && !active.character().equals(character)) {
+            queued.remove(owner);
+            writing.add(owner);
+            try { sessions.exit(player); }
+            finally { writing.remove(owner); }
+            changed = true;
+        }
+        if (!changed) return;
+        queued.remove(owner);
+        sessions.cancelEntry(owner);
+        if (character == null || sessions.active(owner).isPresent()) return;
+        Object token = new Object();
+        var entryMarker = EquipmentSessionMarker.read(player);
+        queued.put(owner, token);
+        try {
+            nextTick.accept(() -> {
+                if (!queued.remove(owner, token) || closed || !player.isOnline()
+                        || !EquipmentSessionMarker.read(player).equals(entryMarker)
+                        || sessions.active(owner).isPresent()
+                        || !sheets.identify(player.getInventory().getItemInOffHand()).filter(character::equals).isPresent()) return;
+                sessions.enter(player);
+            });
+        } catch (RuntimeException failure) { queued.remove(owner, token); throw failure; }
+    }
+
+    /** Invalidate deferred native actions before closing the coordinator/stores on disable. */
+    @Override public void close() {
+        closed = true;
+        for (var owner : java.util.List.copyOf(moves.keySet())) cancelMove(owner);
+        for (var draw : java.util.List.copyOf(draws.values())) cancelDraw(draw);
+        queued.clear();
+        swaps.clear();
+        observed.clear();
+    }
+}

src/main/java/games/dmg/fantasystick/session/EquipmentSessionMarker.java

@@ -0,0 +1,56 @@
+package games.dmg.fantasystick.session;
+
+import java.util.Objects;
+import java.util.Optional;
+import java.util.UUID;
+import org.bukkit.NamespacedKey;
+import org.bukkit.entity.Player;
+import org.bukkit.persistence.PersistentDataType;
+
+/**
+ * Small versioned proof carried with native player state; owner is implicitly that player.
+ * Server-thread only. One PDC value avoids partially written fields, not cross-save/crash
+ * atomicity. No equipment copy, forced player save, or external recovery journal lives here.
+ */
+final class EquipmentSessionMarker {
+    enum Phase { PACKING, PACKED, RESTORING, RESTORED }
+    record Token(UUID session, UUID character, Phase phase) {
+        Token {
+            Objects.requireNonNull(session);
+            Objects.requireNonNull(character);
+            Objects.requireNonNull(phase);
+        }
+        boolean matches(UUID sessionId, UUID characterId) {
+            return session.equals(sessionId) && character.equals(characterId);
+        }
+    }
+    private static final NamespacedKey KEY = new NamespacedKey("fantasystick", "equipment_session");
+
+    static boolean present(Player player) { return player.getPersistentDataContainer().has(KEY); }
+
+    static Optional<Token> read(Player player) {
+        var data = player.getPersistentDataContainer();
+        if (!data.has(KEY, PersistentDataType.STRING)) return Optional.empty();
+        String value = data.get(KEY, PersistentDataType.STRING);
+        if (value == null || value.length() > 100) return Optional.empty();
+        String[] fields = value.split("\\|", -1);
+        if (fields.length != 4 || !fields[0].equals("1")) return Optional.empty();
+        try {
+            return Optional.of(new Token(uuid(fields[1]), uuid(fields[2]), Phase.valueOf(fields[3])));
+        } catch (IllegalArgumentException invalid) { return Optional.empty(); }
+    }
+
+    static void write(Player player, UUID session, UUID character, Phase phase) {
+        var token = new Token(session, character, phase);
+        player.getPersistentDataContainer().set(KEY, PersistentDataType.STRING,
+            "1|" + token.session() + "|" + token.character() + "|" + token.phase());
+    }
+
+    static void clear(Player player) { player.getPersistentDataContainer().remove(KEY); }
+
+    private static UUID uuid(String value) {
+        UUID parsed = UUID.fromString(value);
+        if (!parsed.toString().equals(value)) throw new IllegalArgumentException("Noncanonical UUID");
+        return parsed;
+    }
+}

src/main/java/games/dmg/fantasystick/session/EquipmentSessions.java

@@ -0,0 +1,923 @@
+package games.dmg.fantasystick.session;
+
+import games.dmg.fantasystick.items.CharacterSheets;
+import games.dmg.fantasystick.items.EquipmentStorage;
+import games.dmg.fantasystick.items.SessionControls;
+import games.dmg.fantasystick.persistence.CharacterRecord;
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import games.dmg.fantasystick.persistence.EquipmentSessionStore;
+import java.math.BigInteger;
+import java.time.Clock;
+import java.time.Duration;
+import java.time.Instant;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.UUID;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.CompletionStage;
+import java.util.function.BiConsumer;
+import java.util.function.Consumer;
+import java.util.function.Supplier;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
+
+/**
+ * Server-thread equipment custody, optional native vitals overlay and intercepted defeat.
+ * Rewards and active food overrides remain separate. Presentation is independently cleaned. No inventory/file transaction,
+ * automatic retry or snapshot rollback is promised. The scheduler must defer onto
+ * the server thread; diagnostics must be thread-safe and must not use Player APIs.
+ */
+public final class EquipmentSessions implements AutoCloseable {
+    public record Notice(UUID player, String code, String message) { }
+    public record Failure(UUID player, UUID session, Throwable cause) { }
+    public record Active(UUID player, UUID session, UUID character) { }
+    public record SelectedControl(Active session, int slot, String ability) { }
+
+    private final CharacterStorage characters;
+    private final EquipmentSessionStore receipts;
+    private final Duration switchDelay;
+    private final Clock clock;
+    private final Consumer<Runnable> nextTick;
+    private final Consumer<Notice> notices;
+    private final Consumer<Failure> diagnostics;
+    private games.dmg.fantasystick.presentation.SessionPresentation presentation = games.dmg.fantasystick.presentation.SessionPresentation.NONE;
+    private final SessionClaims claims = new SessionClaims();
+    private final EquipmentStorage equipment = new EquipmentStorage();
+    private SessionControls controls = new SessionControls();
+    private final CharacterSheets sheets = new CharacterSheets();
+    private final Map<UUID, Attempt> pending = new HashMap<>();
+    private final Map<UUID, Attempt> owned = new HashMap<>();
+    private final Map<UUID, Attempt> active = new HashMap<>();
+    // Covers reentrant inventory setters and client sync, not just asynchronous work.
+    private final Map<UUID, Attempt> transitioning = new HashMap<>();
+    private Consumer<UUID> cursorCustody = ignored -> { };
+    private boolean cursorCustodyAttached;
+    private boolean closed;
+    private java.util.function.BooleanSupplier adventureMode = () -> false;
+    private AdventureModeLease gameModes = new AdventureModeLease();
+    private SessionVitals vitals;
+    private boolean closeSweepFinished;
+    private int persistenceOperations;
+    private final CompletableFuture<Void> drained = new CompletableFuture<>();
+
+    private static final class Attempt {
+        final Player player;
+        final UUID owner;
+        UUID character;
+        CharacterRecord record;
+        SessionClaims.Claim claim;
+        UUID session;
+        ItemStack[] snapshot;
+        ItemStack cursor;
+        EquipmentSessionMarker.Token entryMarker;
+        boolean markerValidated;
+        boolean acknowledged;
+        boolean saving;
+        boolean effectsStarted;
+        String previousGameMode;
+        boolean modeStarted;
+        games.dmg.fantasystick.persistence.OrdinaryVitals ordinaryVitals;
+        boolean vitalsStarted;
+        boolean healthSaveRequested;
+        boolean healthAcknowledged = true;
+        boolean nativeRestored;
+        boolean gearRestoredForModeRecovery;
+        boolean presentationInstalled;
+        boolean cleaning;
+        boolean cleanupAttempted;
+        boolean uncertainSave;
+        boolean nativeUncertain;
+        boolean exitRequested;
+        boolean arrival;
+        Attempt recoveryOwner;
+        org.bukkit.Location entryLocation;
+        boolean defeated;
+        boolean deathResolved;
+        boolean gearAcknowledged;
+        boolean bookAttempted;
+        boolean bookDelivered;
+        boolean deliveryInvalidated;
+        boolean conversionReported;
+        ItemStack deathReference;
+        org.bukkit.inventory.InventoryView deathView;
+        Attempt(Player player, UUID owner, UUID character) {
+            this.player = player; this.owner = owner; this.character = character;
+        }
+    }
+
+    public EquipmentSessions(CharacterStorage characters, EquipmentSessionStore receipts, Duration switchDelay,
+                             Consumer<Runnable> nextTick, Consumer<Notice> notices, Consumer<Failure> diagnostics) {
+        this(characters, receipts, switchDelay, Clock.systemUTC(), nextTick, notices, diagnostics);
+    }
+
+    /** Supply the same wall clock as persistence when testing entry/exit deadline boundaries. */
+    public EquipmentSessions(CharacterStorage characters, EquipmentSessionStore receipts, Duration switchDelay, Clock clock,
+                             Consumer<Runnable> nextTick, Consumer<Notice> notices, Consumer<Failure> diagnostics) {
+        this.characters = Objects.requireNonNull(characters);
+        this.receipts = Objects.requireNonNull(receipts);
+        this.switchDelay = Objects.requireNonNull(switchDelay);
+        this.clock = Objects.requireNonNull(clock);
+        if (switchDelay.isNegative()) throw new IllegalArgumentException("Negative switch delay");
+        this.nextTick = Objects.requireNonNull(nextTick);
+        this.notices = Objects.requireNonNull(notices);
+        this.diagnostics = Objects.requireNonNull(diagnostics);
+    }
+
+    public EquipmentSessions(CharacterStorage characters, EquipmentSessionStore receipts, Duration switchDelay, Clock clock,
+                             Consumer<Runnable> nextTick, Consumer<Notice> notices, Consumer<Failure> diagnostics,
+                             games.dmg.fantasystick.presentation.SessionPresentation presentation) {
+        this(characters, receipts, switchDelay, clock, nextTick, notices, diagnostics);
+        this.presentation = Objects.requireNonNull(presentation);
+    }
+
+    public EquipmentSessions(CharacterStorage characters, EquipmentSessionStore receipts, Duration switchDelay, Clock clock,
+                             Consumer<Runnable> nextTick, Consumer<Notice> notices, Consumer<Failure> diagnostics,
+                             games.dmg.fantasystick.presentation.SessionPresentation presentation,
+                             java.util.function.BooleanSupplier adventureMode, AdventureModeLease gameModes) {
+        this(characters, receipts, switchDelay, clock, nextTick, notices, diagnostics, presentation);
+        this.adventureMode = Objects.requireNonNull(adventureMode);
+        this.gameModes = Objects.requireNonNull(gameModes);
+    }
+
+    /** Install before exposing entry so registered definitions drive delivered control metadata. */
+    public synchronized void attachAbilityRegistry(games.dmg.fantasystick.ability.AbilityRegistry registry) {
+        if (!owned.isEmpty()) throw new IllegalStateException("Sessions already started");
+        controls = new SessionControls(Objects.requireNonNull(registry));
+    }
+
+    /** Install before exposing entry; equipment-only adapter tests can omit the health overlay. */
+    public synchronized void attachVitals(SessionVitals value) {
+        if (vitals != null || !owned.isEmpty()) throw new IllegalStateException("Vitals already attached or sessions started");
+        vitals = Objects.requireNonNull(value);
+    }
+
+    /** One server-thread custody bridge per coordinator; never called by persistence workers. */
+    synchronized void attachCursorCustody(Consumer<UUID> invalidate) {
+        if (cursorCustodyAttached) throw new IllegalStateException("Cursor custody already attached");
+        cursorCustody = Objects.requireNonNull(invalidate);
+        cursorCustodyAttached = true;
+    }
+
+    private void invalidateCursor(UUID owner) {
+        try { cursorCustody.accept(owner); }
+        catch (RuntimeException failure) { diagnostic(new Failure(owner, null, failure)); }
+    }
+
+    /**
+     * Completes after close's native sweep and all owned receipt/death mutations finish,
+     * including failed or ambiguous outcomes. Retained receipts/conversions are not outstanding operations.
+     * Observers cannot complete/cancel the lifetime authority. Does not await queued server tasks.
+     */
+    public CompletionStage<Void> drained() { return drained.minimalCompletionStage(); }
+
+    // All accounting, submissions and completion handlers share the lifecycle monitor. A handler
+    // may submit its follow-up before its own reservation is released, including after close.
+    private <T> void persist(Supplier<CompletionStage<T>> operation, BiConsumer<T, Throwable> completion) {
+        persistenceOperations++;
+        CompletionStage<T> work;
+        try { work = operation.get(); }
+        catch (RuntimeException failure) { work = CompletableFuture.failedStage(failure); }
+        work.whenComplete((value, failure) -> {
+            synchronized (EquipmentSessions.this) {
+                try { completion.accept(value, failure); }
+                finally {
+                    persistenceOperations--;
+                    finishDrain();
+                }
+            }
+        });
+    }
+
+    private void finishDrain() {
+        if (closeSweepFinished && persistenceOperations == 0 && transitioning.isEmpty()) drained.complete(null);
+    }
+
+    public synchronized Optional<Active> active(UUID player) {
+        var attempt = active.get(player);
+        return attempt == null ? Optional.empty() : Optional.of(new Active(player, attempt.session, attempt.character));
+    }
+
+    /** Server-thread effect authorization: registry identity alone is not live custody. */
+    public synchronized boolean current(Active session) {
+        var attempt = active.get(session.player());
+        return !closed && attempt != null && attempt.session.equals(session.session())
+            && attempt.character.equals(session.character()) && attempt.player.isOnline()
+            && sheets.identify(attempt.player.getInventory().getItemInOffHand()).filter(attempt.character::equals).isPresent();
+    }
+
+    /** Current active holder for a transferable identity, used only to synchronize acknowledged character writes. */
+    public synchronized Optional<Active> activeCharacter(UUID character) {
+        Objects.requireNonNull(character);
+        return active.values().stream().filter(attempt -> attempt.record != null && attempt.character.equals(character))
+            .filter(attempt -> current(new Active(attempt.owner, attempt.session, attempt.character)))
+            .map(attempt -> new Active(attempt.owner, attempt.session, attempt.character)).findFirst();
+    }
+
+    /** Current transferable character snapshot for a still-authorized server-thread action. */
+    public synchronized Optional<CharacterRecord> currentRecord(Active session) {
+        var attempt = active.get(session.player());
+        return current(session) && attempt != null && attempt.record != null
+            ? Optional.of(attempt.record) : Optional.empty();
+    }
+
+    /** Apply a persisted progression revision to the still-current active session. */
+    public synchronized boolean acknowledgeProgress(Active session, BigInteger expectedRevision, CharacterRecord saved) {
+        var attempt = active.get(session.player());
+        if (closed || attempt == null || attempt.session == null || attempt.record == null
+                || !attempt.session.equals(session.session()) || !attempt.character.equals(session.character())
+                || !attempt.record.revision().equals(expectedRevision) || !saved.id().equals(attempt.character)
+                || !saved.revision().equals(expectedRevision.add(BigInteger.ONE)) || !current(session)) return false;
+        var previous = attempt.record;
+        if (vitals != null) vitals.updateProgress(attempt.player, attempt.session, previous, saved);
+        attempt.record = saved; // Persisted truth precedes any reentrant native presentation setter.
+        if (!previous.loadout().equals(saved.loadout())) {
+            var refreshed = controls.create(saved, attempt.owner, attempt.session);
+            for (int slot = 2; slot < 9; slot++) {
+                if (active.get(attempt.owner) != attempt || !current(session)) return false;
+                attempt.player.getInventory().setItem(slot, refreshed[slot]);
+            }
+            attempt.player.updateInventory(); // No planned native writes after this reentrant boundary.
+        }
+        return true;
+    }
+
+    /** Server-thread authorization for the currently held, issued control and saved loadout. */
+    public synchronized Optional<SelectedControl> selectedControl(Player player, ItemStack reported) {
+        var attempt = active.get(player.getUniqueId());
+        if (closed || attempt == null || attempt.player != player || !player.isOnline() || attempt.record == null
+                || !sheets.identify(player.getInventory().getItemInOffHand()).filter(attempt.character::equals).isPresent()) {
+            return Optional.empty();
+        }
+        int slot = player.getInventory().getHeldItemSlot();
+        var actual = player.getInventory().getItem(slot);
+        var identity = controls.identify(actual).orElse(null);
+        if (identity == null || identity.slot() != slot || !identity.owner().equals(attempt.owner)
+                || !identity.session().equals(attempt.session) || !Objects.equals(actual, reported)) return Optional.empty();
+        String ability = "";
+        if (slot >= 2) {
+            ability = controls.ability(actual).orElse("");
+            if (ability.isEmpty() || !ability.equals(attempt.record.loadout().get(slot - 2))) return Optional.empty();
+        }
+        return Optional.of(new SelectedControl(new Active(attempt.owner, attempt.session, attempt.character), slot, ability));
+    }
+
+    public synchronized void enter(Player player) {
+        UUID owner = player.getUniqueId();
+        if (closed) return;
+        if (transitioning.containsKey(owner)) {
+            notice(owner, "BUSY", "An equipment transition is still completing; retry afterwards."); return;
+        }
+        if (active.containsKey(owner)) return;
+        cancelEntry(owner);
+        if (owned.containsKey(owner)) {
+            notice(owner, "BUSY", "Equipment persistence or recovery is pending; retry after it completes.");
+            return;
+        }
+        var character = sheets.identify(player.getInventory().getItemInOffHand());
+        if (!player.isOnline() || character.isEmpty()) {
+            notice(owner, "INVALID_SHEET", "Hold a valid live character sheet in your off hand.");
+            return;
+        }
+        var attempt = new Attempt(player, owner, character.orElseThrow());
+        if (adventureMode.getAsBoolean() && player.getGameMode() != org.bukkit.GameMode.ADVENTURE) {
+            attempt.previousGameMode = player.getGameMode().name();
+        }
+        attempt.snapshot = snapshot(player);
+        attempt.cursor = copy(player.getItemOnCursor());
+        pending.put(owner, attempt);
+        characters.find(attempt.character).thenCombine(receipts.find(owner), Loaded::new)
+            .whenComplete((loaded, failure) -> schedule(attempt, () -> loaded(attempt, loaded, failure)));
+    }
+
+    private record Loaded(Optional<CharacterRecord> character, Optional<EquipmentSessionStore.State> state) { }
+
+    private boolean entryNativeSafe(Attempt attempt, EquipmentSessionStore.State state) {
+        if (hasRemnants(attempt.player) || !gameModes.available(attempt.player)
+                || vitals != null && !vitals.available(attempt.player)) return false;
+        var marker = EquipmentSessionMarker.read(attempt.player).orElse(null);
+        if (EquipmentSessionMarker.present(attempt.player)) {
+            // A terminal marker is resolved only by its matching completed file acknowledgment.
+            // Keep it until the next successful entry; worker acknowledgments never touch PDC.
+            var exit = state == null ? null : state.lastExit();
+            if (marker == null || marker.phase() != EquipmentSessionMarker.Phase.RESTORED
+                    || state == null || state.pending() != null || exit == null
+                    || !marker.matches(exit.sessionId(), exit.characterId())) return false;
+        }
+        attempt.entryMarker = marker;
+        attempt.markerValidated = true;
+        return true;
+    }
+
+    private static boolean hasRemnants(Player player) {
+        return Arrays.stream(player.getInventory().getContents()).anyMatch(EquipmentSessions::remnant)
+            || remnant(player.getItemOnCursor());
+    }
+
+    private static boolean remnant(ItemStack item) {
+        if (item == null || item.isEmpty() || !item.hasItemMeta()) return false;
+        // Even malformed/foreign remnants are unsafe to pack as ordinary equipment.
+        return item.getItemMeta().getPersistentDataContainer().getKeys().stream().anyMatch(key ->
+            key.getNamespace().equals("fantasystick")
+                && (key.getKey().startsWith("storage_") || key.getKey().startsWith("control_")));
+    }
+
+    private synchronized void loaded(Attempt attempt, Loaded loaded, Throwable failure) {
+        if (!entryCurrent(attempt) || attempt.claim != null) return;
+        if (failure != null) { fail(attempt, failure); return; }
+        var record = loaded.character().orElse(null);
+        if (record == null || record.dead() || record.health().signum() <= 0) {
+            refuse(attempt, "UNAVAILABLE_CHARACTER", "The saved character is missing, dead or has no health."); return;
+        }
+        if (loaded.state().isPresent()) {
+            var state = loaded.state().orElseThrow();
+            if (state.pending() != null) {
+                refuse(attempt, "RECOVERY_REQUIRED", "An unresolved equipment receipt requires validated recovery."); return;
+            }
+            Instant now = clock.instant();
+            if (!state.canEnter(attempt.character, switchDelay, now)) {
+                Duration remaining = Duration.between(now, state.lastExit().deadline());
+                long seconds = remaining.getSeconds() + (remaining.getNano() == 0 ? 0 : 1);
+                refuse(attempt, "COOLDOWN", "Wait " + seconds + " seconds to switch characters (until "
+                    + state.lastExit().deadline() + "); the same character may be resumed now."); return;
+            }
+        }
+        if (!entryNativeSafe(attempt, loaded.state().orElse(null))) {
+            refuse(attempt, "NATIVE_RECOVERY_REQUIRED", "Native equipment marker or control/box remnants require inspection; entry did not change items.");
+            return;
+        }
+        var refusal = equipment.refusal(attempt.player.getInventory(), attempt.owner, UUID.randomUUID());
+        if (refusal.isPresent()) { refuse(attempt, refusal.orElseThrow().name(), "Equipment entry refused: " + refusal.orElseThrow()); return; }
+        // Restart receipts can belong to dead/missing characters, so they cannot acquire a
+        // live SessionClaims token. Their unresolved equipment outcome still excludes entry.
+        if (owned.values().stream().anyMatch(other -> attempt.character.equals(other.character))) {
+            refuse(attempt, "CHARACTER_BUSY", "This character has an unresolved equipment session."); return;
+        }
+        attempt.claim = claims.tryClaim(attempt.owner, record).orElse(null);
+        if (attempt.claim == null) { refuse(attempt, "CHARACTER_BUSY", "This character or player already has a session."); return; }
+        attempt.session = attempt.claim.sessionId();
+        owned.put(attempt.owner, attempt);
+        controls.create(record, attempt.owner, attempt.session); // Validate all nine controls before preparation/packing.
+        if (vitals != null) attempt.ordinaryVitals = vitals.capture(attempt.player);
+        attempt.saving = true;
+        persist(() -> receipts.prepare(attempt.owner, attempt.session, attempt.character, attempt.previousGameMode, attempt.ordinaryVitals), (saved, error) -> {
+            attempt.saving = false;
+            if (error != null) { attempt.uncertainSave = true; fail(attempt, error); return; }
+            attempt.acknowledged = true;
+            if (!current(attempt)) { abandon(attempt); return; }
+            // Queue the cross-worker read under lifecycle ownership: close cannot finish
+            // its drain boundary and then have this callback submit fresh character IO.
+            characters.find(attempt.character).whenComplete((fresh, readError) ->
+                schedule(attempt, () -> complete(attempt, fresh, readError)));
+        });
+    }
+
+    private synchronized void complete(Attempt attempt, Optional<CharacterRecord> fresh, Throwable failure) {
+        if (!entryCurrent(attempt)) return;
+        if (failure != null) { fail(attempt, failure); return; }
+        var record = fresh.orElse(null);
+        if (record == null || record.dead() || record.health().signum() <= 0) {
+            refuse(attempt, "UNAVAILABLE_CHARACTER", "The saved character is no longer live."); return;
+        }
+        transitioning.put(attempt.owner, attempt);
+        boolean packed = false;
+        try {
+            var items = controls.create(record, attempt.owner, attempt.session);
+            attempt.entryLocation = attempt.player.getLocation().clone(); // Server thread, before activation.
+            attempt.modeStarted = attempt.previousGameMode != null;
+            if (!gameModes.enter(attempt.player, attempt.session, attempt.previousGameMode)) {
+                attempt.modeStarted = false; // Returned refusal is not an uncertain setter exception.
+                refuse(attempt, "GAME_MODE_REFUSED", "Adventure mode was refused; entry did not pack equipment."); return;
+            }
+            if (!entryCurrent(attempt) || attempt.exitRequested) return;
+            attempt.effectsStarted = true;
+            mark(attempt, EquipmentSessionMarker.Phase.PACKING);
+            var result = equipment.pack(attempt.player.getInventory(), attempt.owner, attempt.session);
+            if (result != EquipmentStorage.PackResult.PACKED) {
+                EquipmentSessionMarker.clear(attempt.player); // Adapter refusal proves no inventory writes.
+                attempt.effectsStarted = false;
+                refuse(attempt, result.name(), "Equipment entry refused: " + result); return;
+            }
+            packed = true;
+            if (interrupted(attempt)) return;
+            for (int slot = 0; slot < 9; slot++) {
+                attempt.player.getInventory().setItem(slot, items[slot]);
+                if (interrupted(attempt)) return;
+            }
+            mark(attempt, EquipmentSessionMarker.Phase.PACKED);
+            if (vitals != null) {
+                attempt.vitalsStarted = true;
+                attempt.healthAcknowledged = false;
+                vitals.enter(attempt.player, attempt.session, attempt.ordinaryVitals, record);
+                if (attempt.exitRequested || !current(attempt)) return;
+            }
+            pending.remove(attempt.owner, attempt);
+            if (!attempt.exitRequested) {
+                attempt.record = record;
+                active.put(attempt.owner, attempt);
+                attempt.presentationInstalled = true;
+                try { presentation.activate(attempt.player, attempt.session, record); }
+                catch (RuntimeException | LinkageError error) { withdrawPresentation(attempt); diagnostic(attempt, error); }
+            }
+            attempt.player.updateInventory();
+        } catch (RuntimeException error) {
+            fail(attempt, error); // Effects may have started: never roll back or replay them.
+            notice(attempt.owner, "NATIVE_UNCERTAIN", "Equipment mutation failed; items and receipt require inspection.");
+        } finally {
+            if (!active.containsKey(attempt.owner) && attempt.modeStarted) {
+                restoreGameMode(attempt);
+                if (!attempt.effectsStarted && attempt.exitRequested) pending.remove(attempt.owner, attempt);
+                if (!attempt.effectsStarted && !current(attempt)) abandon(attempt);
+            }
+            transitioning.remove(attempt.owner, attempt);
+            // The deferred exit must reserve persistence before drain can be signalled.
+            try {
+                if (packed && !attempt.nativeUncertain && !attempt.defeated && attempt.exitRequested) restoreExit(attempt);
+            } finally { finishDrain(); }
+        }
+    }
+
+    private boolean interrupted(Attempt attempt) {
+        if (current(attempt) || attempt.exitRequested) return false;
+        notice(attempt.owner, "ENTRY_INTERRUPTED", "Entry was cancelled during packing; the genuine box and receipt were retained for recovery.");
+        return true;
+    }
+
+    /**
+     * Ends mode without awaiting IO. Reentrant calls during an owned native transition request
+     * teardown at that transition's boundary and return NOT_FOUND (no separate restore ran).
+     * A native exception returns INVALID_BOX with NATIVE_UNCERTAIN notice/diagnostic; never retry it.
+     */
+    public synchronized EquipmentStorage.RestoreResult exit(Player player) {
+        UUID owner = player.getUniqueId();
+        var transition = transitioning.get(owner);
+        if (transition != null) {
+            active.remove(owner, transition);
+            withdrawPresentation(transition);
+            transition.exitRequested = true;
+            invalidateCursor(owner);
+            return EquipmentStorage.RestoreResult.NOT_FOUND;
+        }
+        cancelEntry(owner);
+        var attempt = active.remove(owner);
+        if (attempt == null) { invalidateCursor(owner); return EquipmentStorage.RestoreResult.NOT_FOUND; }
+        return restoreExit(attempt);
+    }
+
+    /**
+     * Paper dispatches death before inventory clearing/drop spawning. Cancellation returns from
+     * ServerPlayer.die; keepInventory is neither needed nor sufficient for this transition.
+     * Only an active session owns defeat. Later ordinary deaths and prior vetoes stay ordinary.
+     */
+    public synchronized void defeat(org.bukkit.event.entity.PlayerDeathEvent event) {
+        if (closed || event.isCancelled()) return;
+        UUID owner = event.getEntity().getUniqueId();
+        var attempt = active.remove(owner);
+        if (attempt == null) {
+            var transition = transitioning.get(owner);
+            if (transition != null && transition.defeated) {
+                // Contain only reentrance inside this native defeat, not a later ordinary
+                // lethal outcome. This is not a grace period or post-defeat invulnerability.
+                event.setCancelled(true);
+                event.setReviveHealth(Objects.requireNonNull(event.getEntity()
+                    .getAttribute(org.bukkit.attribute.Attribute.MAX_HEALTH)).getValue());
+            }
+            return;
+        }
+        withdrawPresentation(attempt);
+        attempt.defeated = true;
+        event.setCancelled(true);
+        boolean reserved = transitioning.putIfAbsent(attempt.owner, attempt) == null;
+        // Submit first: any subsequent native getter/setter/notice can reenter disable, which
+        // closes CharacterStorage. No dependent character work is submitted after this point.
+        persist(() -> characters.recordDeath(attempt.character), (dead, failure) -> {
+            if (failure != null) { diagnostic(attempt, failure); conversionUncertain(attempt, "Death save failed or is uncertain"); return; }
+            if (dead.isEmpty()) { conversionUncertain(attempt, "Character was missing or already dead; no new Tail authorized"); return; }
+            attempt.deathResolved = true;
+            if (closed) { conversionUncertain(attempt, "Shutdown before Tail conversion"); return; }
+            try {
+                nextTick.accept(() -> {
+                    synchronized (EquipmentSessions.this) { deliverTail(attempt, dead.orElseThrow()); }
+                });
+            } catch (RuntimeException error) { diagnostic(attempt, error); conversionUncertain(attempt, "Tail callback rejected"); }
+        });
+        try {
+            attempt.deathReference = copy(attempt.player.getInventory().getItemInOffHand());
+            attempt.deathView = attempt.player.getOpenInventory();
+            restoreExit(attempt);
+            // Read the current maximum after owned overlay cleanup, including legitimate
+            // ordinary modifiers. Never reconstruct attributes from an entry snapshot.
+            double maximum = Objects.requireNonNull(attempt.player.getAttribute(org.bukkit.attribute.Attribute.MAX_HEALTH)).getValue();
+            event.setReviveHealth(maximum);
+            attempt.player.setHealth(maximum); // Native cancellation only fills health when <= 0.
+            notice(attempt.owner, "DEFEAT", "§cYour character was defeated.");
+            try {
+                if (!attempt.player.teleport(attempt.entryLocation.clone())) {
+                    notice(attempt.owner, "DEFEAT_RETURN_FAILED", "Return to the session entry location was refused; you remain here.");
+                }
+            } catch (RuntimeException failure) {
+                diagnostic(attempt, failure);
+                notice(attempt.owner, "DEFEAT_RETURN_FAILED", "Return to the session entry location failed; you remain here.");
+            }
+        } catch (RuntimeException failure) {
+            diagnostic(attempt, failure);
+            conversionUncertain(attempt, "Native defeat transition failed; inspect retained equipment and death state");
+        } finally {
+            if (reserved) transitioning.remove(attempt.owner, attempt);
+            finishDrain();
+        }
+    }
+
+    /** No automatic delivery after quit/respawn, including a reconnect of the same Player ID. */
+    public synchronized void invalidateContext(UUID owner) {
+        invalidateCursor(owner);
+        cancelEntry(owner);
+        invalidateTail(owner);
+    }
+
+    /** Invalidates deferred conversion only; does not move a cursor, box, sheet or controls. */
+    public synchronized void invalidateTail(UUID owner) {
+        var attempt = owned.get(owner);
+        if (attempt != null && attempt.defeated) attempt.deliveryInvalidated = true;
+    }
+
+    private void deliverTail(Attempt attempt, CharacterRecord dead) {
+        if (attempt.bookAttempted) return;
+        attempt.bookAttempted = true; // Even an exception after a native write never permits replay.
+        try {
+            if (!tailContext(attempt)
+                    || !Objects.equals(attempt.deathReference, copy(attempt.player.getInventory().getItemInOffHand()))
+                    || !sheets.identify(attempt.deathReference).filter(attempt.character::equals).isPresent()
+                    || attempt.deathReference.getAmount() < 1
+                    || attempt.deathReference.getAmount() > attempt.deathReference.getMaxStackSize()) {
+                conversionUncertain(attempt, "Tail destination/context is stale or equipment restoration is unresolved"); return;
+            }
+            // An exact captured stack of copied references represents ONE character, not N
+            // deaths. Replace that whole stack with ONE book; never scan/delete other copies,
+            // move items, overwrite a changed stack, or grant into an available slot.
+            var book = new games.dmg.fantasystick.items.TailBooks().create(dead);
+            attempt.player.getInventory().setItemInOffHand(book);
+            if (!tailContext(attempt) || !book.equals(attempt.player.getInventory().getItemInOffHand())) {
+                conversionUncertain(attempt, "Context changed during Tail write; delivery may already have happened"); return;
+            }
+            attempt.bookDelivered = true;
+            release(attempt);
+            sync(attempt);
+        } catch (RuntimeException failure) {
+            diagnostic(attempt, failure);
+            conversionUncertain(attempt, "Tail native write failed or is uncertain; never replay");
+        }
+    }
+
+    private boolean tailContext(Attempt attempt) {
+        if (closed || attempt.deliveryInvalidated || owned.get(attempt.owner) != attempt
+                || !attempt.player.isOnline() || attempt.player.getOpenInventory() != attempt.deathView) return false;
+        var marker = EquipmentSessionMarker.read(attempt.player).orElse(null);
+        return marker != null && marker.matches(attempt.session, attempt.character)
+            && marker.phase() == EquipmentSessionMarker.Phase.RESTORED;
+    }
+
+    private void conversionUncertain(Attempt attempt, String reason) {
+        if (attempt.conversionReported) return;
+        attempt.conversionReported = true;
+        attempt.deliveryInvalidated = true;
+        diagnostic(attempt, new IllegalStateException(reason + "; character " + attempt.character
+            + ". Retain current items and authoritative state; no automatic reissue or revival."));
+    }
+
+    private void withdrawPresentation(Attempt attempt) {
+        if (!attempt.presentationInstalled) return;
+        attempt.presentationInstalled = false;
+        try { presentation.withdraw(attempt.owner, attempt.session); }
+        catch (RuntimeException | LinkageError failure) { diagnostic(attempt, failure); }
+    }
+
+    private boolean restoreGameMode(Attempt attempt) {
+        if (attempt.previousGameMode == null) return true;
+        try {
+            if (gameModes.restore(attempt.player, attempt.session, attempt.previousGameMode)) {
+                attempt.modeStarted = false;
+                return true;
+            }
+        } catch (RuntimeException failure) { diagnostic(attempt, failure); }
+        notice(attempt.owner, "GAME_MODE_RECOVERY", "Game-mode restoration was refused or ambiguous; retained receipt requires inspection.");
+        return false;
+    }
+
+    private EquipmentStorage.RestoreResult restoreExit(Attempt attempt) {
+        active.remove(attempt.owner, attempt);
+        withdrawPresentation(attempt);
+        boolean reserved = transitioning.putIfAbsent(attempt.owner, attempt) == null;
+        try {
+            invalidateCursor(attempt.owner);
+            saveRemainingHealth(attempt);
+            boolean modeRestored = restoreGameMode(attempt);
+            EquipmentStorage.RestoreResult result;
+            try {
+                result = restoreMarked(attempt);
+            } catch (RuntimeException failure) {
+                attempt.nativeUncertain = true;
+                restoreVitals(attempt); // Proven health ownership is independent of uncertain equipment writes.
+                persistExit(attempt, false);
+                diagnostic(attempt, failure);
+                notice(attempt.owner, "NATIVE_UNCERTAIN", "Restoration failed; items and receipt require inspection.");
+                return EquipmentStorage.RestoreResult.INVALID_BOX;
+            }
+            boolean vitalsRestored = restoreVitals(attempt);
+            if (result == EquipmentStorage.RestoreResult.RESTORED && (!modeRestored || !vitalsRestored || !attempt.healthAcknowledged)) {
+                attempt.gearRestoredForModeRecovery = true;
+            }
+            persistExit(attempt, result == EquipmentStorage.RestoreResult.RESTORED && modeRestored && vitalsRestored);
+            if (result != EquipmentStorage.RestoreResult.RESTORED) {
+                notice(attempt.owner, result.name(), "Equipment recovery refused: " + result);
+            } else sync(attempt);
+            return result;
+        } finally {
+            if (reserved) transitioning.remove(attempt.owner, attempt);
+            finishDrain();
+        }
+    }
+
+    private void mark(Attempt attempt, EquipmentSessionMarker.Phase phase) {
+        EquipmentSessionMarker.write(attempt.player, attempt.session, attempt.character, phase);
+    }
+
+    private EquipmentStorage.RestoreResult restoreMarked(Attempt attempt) {
+        invalidateCursor(attempt.owner);
+        var marker = EquipmentSessionMarker.read(attempt.player);
+        // Only a successful restoration observed by this process for this exact Player
+        // permits finishing a mode-only retry. Serialized RESTORED alone proves nothing.
+        if (attempt.gearRestoredForModeRecovery && !hasRemnants(attempt.player)
+                && marker.filter(token -> token.matches(attempt.session, attempt.character)
+                    && token.phase() == EquipmentSessionMarker.Phase.RESTORED).isPresent()) {
+            return EquipmentStorage.RestoreResult.RESTORED;
+        }
+        if (marker.filter(token -> token.matches(attempt.session, attempt.character)
+                && token.phase() == EquipmentSessionMarker.Phase.PACKED).isEmpty()) {
+            notice(attempt.owner, "NATIVE_MARKER", "Missing, malformed, mismatched or ambiguous native equipment marker; "
+                + "expected session " + attempt.session + ", character " + attempt.character + ", observed "
+                + marker.map(Object::toString).orElse("missing/malformed")
+                + ". Items and receipt retained. RESTORED receipts require manual reconciliation too.");
+            return EquipmentStorage.RestoreResult.INVALID_BOX;
+        }
+        mark(attempt, EquipmentSessionMarker.Phase.RESTORING);
+        var result = equipment.restore(attempt.player.getInventory(), attempt.owner, attempt.session,
+            item -> controls.owned(item, attempt.owner, attempt.session),
+            attempt.player.getItemOnCursor(), attempt.player::setItemOnCursor);
+        // Returned refusals are read-only. Exceptions must retain the ambiguous RESTORING phase.
+        mark(attempt, result == EquipmentStorage.RestoreResult.RESTORED
+            ? EquipmentSessionMarker.Phase.RESTORED : EquipmentSessionMarker.Phase.PACKED);
+        return result;
+    }
+
+    private void sync(Attempt attempt) {
+        try { attempt.player.updateInventory(); }
+        catch (RuntimeException failure) { diagnostic(attempt, failure); }
+    }
+
+    private void saveRemainingHealth(Attempt attempt) {
+        if (!attempt.vitalsStarted || attempt.defeated || attempt.healthSaveRequested) return;
+        attempt.healthSaveRequested = true; // Failed/uncertain writes are not authority for an automatic replay.
+        try {
+            var remaining = vitals.remaining(attempt.player, attempt.session, attempt.ordinaryVitals);
+            var limit = NativeHealthLimit.read();
+            persist(() -> characters.saveHealth(attempt.character, remaining, limit), (saved, failure) -> {
+                if (failure != null || saved.isEmpty()) {
+                    diagnostic(attempt, failure != null ? failure : new IllegalStateException("Character unavailable for health save"));
+                    return;
+                }
+                attempt.healthAcknowledged = true;
+                if (attempt.nativeRestored) persistExit(attempt, true);
+            });
+        } catch (RuntimeException failure) { diagnostic(attempt, failure); }
+    }
+
+    private boolean restoreVitals(Attempt attempt) {
+        if (vitals == null || attempt.ordinaryVitals == null) return true;
+        try {
+            if (vitals.restore(attempt.player, attempt.session, attempt.ordinaryVitals)) return true;
+        } catch (RuntimeException failure) { diagnostic(attempt, failure); }
+        notice(attempt.owner, "VITALS_RECOVERY", "Health/nutrition restoration was refused or ambiguous; retained receipt requires inspection.");
+        return false;
+    }
+
+    private void persistExit(Attempt attempt, boolean restored) {
+        attempt.nativeRestored = restored;
+        boolean complete = restored && (attempt.healthAcknowledged || attempt.defeated);
+        attempt.saving = true;
+        persist(() -> complete
+            ? receipts.completeExit(attempt.owner, attempt.session, switchDelay)
+            : receipts.recordExit(attempt.owner, attempt.session, switchDelay), (state, failure) -> {
+                attempt.saving = false;
+                if (failure != null) diagnostic(attempt, failure);
+                else if (complete) { attempt.gearAcknowledged = true; release(attempt); }
+            });
+    }
+
+    public synchronized void cancelEntry(UUID player) {
+        var attempt = pending.remove(player);
+        if (attempt != null) abandon(attempt);
+    }
+
+    private void abandon(Attempt attempt) {
+        if (attempt.modeStarted || attempt.effectsStarted || attempt.cleanupAttempted || attempt.uncertainSave) return;
+        if (attempt.acknowledged) {
+            attempt.cleaning = true;
+            attempt.cleanupAttempted = true;
+            persist(() -> receipts.clearReceipt(attempt.owner, attempt.session), (state, failure) -> {
+                attempt.cleaning = false;
+                if (failure == null) release(attempt); else diagnostic(attempt, failure);
+            });
+        } else if (!attempt.saving) release(attempt);
+    }
+
+    private void release(Attempt attempt) {
+        if (attempt.defeated && (!attempt.deathResolved || !attempt.gearAcknowledged || !attempt.bookDelivered)) return;
+        owned.remove(attempt.owner, attempt);
+        if (attempt.claim != null) attempt.claim.close();
+    }
+    private boolean current(Attempt attempt) { return !closed && pending.get(attempt.owner) == attempt; }
+    private boolean entryCurrent(Attempt attempt) {
+        if (!current(attempt)) { abandon(attempt); return false; }
+        if (!attempt.player.isOnline()
+                || attempt.previousGameMode != null && !attempt.modeStarted
+                    && !attempt.player.getGameMode().name().equals(attempt.previousGameMode)
+                || attempt.ordinaryVitals != null && !attempt.vitalsStarted && !vitals.unchanged(attempt.player, attempt.ordinaryVitals)
+                || attempt.markerValidated && (EquipmentSessionMarker.present(attempt.player) != (attempt.entryMarker != null)
+                    || !Objects.equals(attempt.entryMarker, EquipmentSessionMarker.read(attempt.player).orElse(null)))
+                || !Arrays.equals(attempt.snapshot, snapshot(attempt.player))
+                || !Objects.equals(attempt.cursor, copy(attempt.player.getItemOnCursor()))
+                || !sheets.identify(attempt.player.getInventory().getItemInOffHand()).filter(attempt.character::equals).isPresent()) {
+            refuse(attempt, "STALE_ENTRY", "Entry changed before preparation completed; retry with your current equipment.");
+            return false;
+        }
+        return true;
+    }
+    private void refuse(Attempt attempt, String code, String message) {
+        pending.remove(attempt.owner, attempt);
+        abandon(attempt);
+        notice(attempt.owner, code, message);
+    }
+    private void fail(Attempt attempt, Throwable failure) {
+        if (attempt.effectsStarted && owned.get(attempt.owner) == attempt) attempt.nativeUncertain = true;
+        pending.remove(attempt.owner, attempt);
+        active.remove(attempt.owner, attempt);
+        withdrawPresentation(attempt);
+        if (attempt.vitalsStarted) {
+            // Only native callbacks can reach this phase. Preserve observed character damage
+            // before independent vitals teardown; the uncertain equipment receipt stays owned.
+            saveRemainingHealth(attempt);
+            restoreVitals(attempt);
+        }
+        abandon(attempt);
+        diagnostic(attempt, failure);
+    }
+    private void diagnostic(Attempt attempt, Throwable failure) {
+        diagnostic(new Failure(attempt.owner, attempt.session, failure));
+    }
+    private void diagnostic(Failure failure) {
+        try { diagnostics.accept(failure); }
+        catch (RuntimeException ignored) { /* Observers cannot abort owned cleanup or shutdown. */ }
+    }
+    private void notice(UUID owner, String code, String message) {
+        try { notices.accept(new Notice(owner, code, message)); }
+        catch (RuntimeException failure) { diagnostic(new Failure(owner, null, failure)); }
+    }
+    private synchronized void schedule(Attempt attempt, Runnable callback) {
+        // close already invalidates pending work and owns its never-packed cleanup. Accepted
+        // reads may still finish, but must not require another task on a disabled scheduler.
+        if (closed) return;
+        try {
+            nextTick.accept(() -> {
+                synchronized (EquipmentSessions.this) {
+                    try { callback.run(); }
+                    catch (RuntimeException failure) { fail(attempt, failure); }
+                }
+            });
+        } catch (RuntimeException failure) { fail(attempt, failure); }
+    }
+    private static ItemStack copy(ItemStack item) { return item == null ? null : item.clone(); }
+    private static ItemStack[] snapshot(Player player) {
+        return Arrays.stream(player.getInventory().getContents()).map(EquipmentSessions::copy).toArray(ItemStack[]::new);
+    }
+
+    /** Explicit proof-based reconciliation; never infer restoration from an absent box. */
+    public synchronized void recover(Player player) { recover(player, false); }
+
+    /** Join reconciliation: recover a pending receipt, otherwise request normal entry. */
+    public synchronized void arrive(Player player) { recover(player, true); }
+
+    private void recover(Player player, boolean arrival) {
+        UUID owner = player.getUniqueId();
+        invalidateCursor(owner);
+        if (closed || !player.isOnline()) return;
+        var previous = owned.get(owner);
+        if (previous != null && previous.defeated && (arrival || previous.gearAcknowledged
+                || previous.bookDelivered || previous.player != player)) {
+            notice(owner, "DEFEAT_PENDING", "Death or Tail conversion is pending/uncertain; retained state requires inspection, not automatic replay."); return;
+        }
+        if (previous != null && previous.nativeUncertain) {
+            notice(owner, "NATIVE_UNCERTAIN", "A native equipment write had an uncertain outcome; automatic restoration is unsafe. Retain items for inspection."); return;
+        }
+        if (transitioning.containsKey(owner) || active.containsKey(owner)
+                || previous != null && (previous.saving || previous.cleaning)) {
+            notice(owner, "BUSY", "A session transition is still pending; recovery did not change items."); return;
+        }
+        cancelEntry(owner);
+        var attempt = new Attempt(player, owner, null);
+        attempt.recoveryOwner = previous;
+        // A recovered receipt has no process-local never-packed proof.
+        attempt.effectsStarted = true;
+        attempt.arrival = arrival;
+        pending.put(owner, attempt);
+        receipts.find(owner).whenComplete((state, failure) ->
+            schedule(attempt, () -> recovered(attempt, state, failure)));
+    }
+
+    private synchronized void recovered(Attempt attempt, Optional<EquipmentSessionStore.State> state, Throwable failure) {
+        if (!current(attempt)) return;
+        pending.remove(attempt.owner, attempt);
+        if (!attempt.player.isOnline()) return;
+        if (owned.get(attempt.owner) != attempt.recoveryOwner) {
+            notice(attempt.owner, "STALE_RECOVERY", "Session ownership changed after the recovery read; no old receipt was replayed.");
+            return;
+        }
+        if (failure != null) { diagnostic(attempt, failure); return; }
+        var receipt = state.map(EquipmentSessionStore.State::pending).orElse(null);
+        if (receipt == null) {
+            if (attempt.arrival) {
+                if (sheets.identify(attempt.player.getInventory().getItemInOffHand()).isPresent()) enter(attempt.player);
+                else if (EquipmentSessionMarker.present(attempt.player) || hasRemnants(attempt.player)) {
+                    notice(attempt.owner, "NATIVE_RECOVERY_REQUIRED", "Native equipment remnants have no pending receipt; items were retained for inspection.");
+                }
+                return; // Ordinary no-sheet/no-receipt arrivals are not rejected entry attempts.
+            }
+            notice(attempt.owner, "NO_RECEIPT", "No saved equipment receipt is available; items were left unchanged."); return;
+        }
+        attempt.character = receipt.characterId();
+        attempt.session = receipt.sessionId();
+        attempt.previousGameMode = receipt.previousGameMode();
+        attempt.ordinaryVitals = receipt.ordinaryVitals();
+        attempt.vitalsStarted = attempt.ordinaryVitals != null;
+        attempt.healthAcknowledged = !attempt.vitalsStarted;
+        attempt.modeStarted = attempt.previousGameMode != null;
+        var previous = owned.get(attempt.owner);
+        if (previous != null && !attempt.session.equals(previous.session)) {
+            notice(attempt.owner, "SESSION_MISMATCH", "Saved and process-local sessions disagree; items were left unchanged."); return;
+        }
+        if (previous != null && (previous.defeated || previous.vitalsStarted)) {
+            // Explicit same-lifetime equipment recovery still uses matching receipt/PACKED
+            // proof. Keep the original death authority and its pending worker completion;
+            // do not replace it with a recovery Attempt that could release its claim early.
+            previous.deliveryInvalidated = true;
+            restoreExit(previous);
+            return;
+        }
+        if (previous != null) {
+            attempt.claim = previous.claim;
+            attempt.gearRestoredForModeRecovery = previous.player == attempt.player && previous.gearRestoredForModeRecovery;
+        }
+        owned.put(attempt.owner, attempt);
+        transitioning.put(attempt.owner, attempt);
+        try {
+            saveRemainingHealth(attempt);
+            boolean modeRestored = restoreGameMode(attempt);
+            var result = restoreMarked(attempt);
+            boolean vitalsRestored = restoreVitals(attempt);
+            if (result == EquipmentStorage.RestoreResult.RESTORED) {
+                if (!modeRestored || !vitalsRestored || !attempt.healthAcknowledged) attempt.gearRestoredForModeRecovery = true;
+                persistExit(attempt, modeRestored && vitalsRestored);
+                sync(attempt);
+            } else notice(attempt.owner, result.name(), "Equipment recovery refused: " + result + "; receipt and items retained.");
+        } catch (RuntimeException error) {
+            fail(attempt, error);
+            notice(attempt.owner, "NATIVE_UNCERTAIN", "Recovery mutation failed; native phase, items and receipt retained for inspection.");
+        } finally {
+            transitioning.remove(attempt.owner, attempt);
+            finishDrain();
+        }
+    }
+    @Override public synchronized void close() {
+        if (closed) return;
+        closed = true;
+        try {
+            for (var attempt : transitioning.values()) {
+                attempt.exitRequested = true;
+                withdrawPresentation(attempt);
+            }
+            // Accepted main-thread tasks may be discarded on disable. Report now as well as
+            // from worker completion; neither path needs a scheduler on a disabled plugin.
+            for (var attempt : java.util.List.copyOf(owned.values())) {
+                if (attempt.defeated && !attempt.bookDelivered) conversionUncertain(attempt, "Shutdown before confirmed Tail conversion");
+            }
+            for (var owner : java.util.List.copyOf(pending.keySet())) cancelEntry(owner);
+            for (var attempt : java.util.List.copyOf(active.values())) exit(attempt.player);
+            claims.close();
+        } finally {
+            closeSweepFinished = true;
+            finishDrain();
+        }
+    }
+}

src/main/java/games/dmg/fantasystick/session/NativeHealthLimit.java

@@ -0,0 +1,29 @@
+package games.dmg.fantasystick.session;
+
+import java.math.BigDecimal;
+import org.bukkit.attribute.Attribute;
+
+/**
+ * Read-only access to the pinned runtime's health range; never changes server settings or attributes.
+ * Call on the server thread after registry initialization. The API exposes no range getter, so use the
+ * supported runtime's public Craft/native accessors and fail explicitly if they are incompatible.
+ * This reads the current range on each call, not a guessed default or cached configuration value.
+ * Native session/health application is separate and must revalidate its context before mutation.
+ */
+public final class NativeHealthLimit {
+    private NativeHealthLimit() { }
+
+    public static BigDecimal read() {
+        try {
+            Object range = Attribute.MAX_HEALTH.getClass().getMethod("getHandle").invoke(Attribute.MAX_HEALTH);
+            double maximum = ((Number) range.getClass().getMethod("getMaxValue").invoke(range)).doubleValue();
+            if (!Double.isFinite(maximum) || maximum <= 0
+                    || !Float.isFinite((float) maximum) || (float) maximum <= 0) {
+                throw new IllegalStateException("Native maximum health must be positive and representable as Minecraft health");
+            }
+            return BigDecimal.valueOf(maximum);
+        } catch (ReflectiveOperationException | ClassCastException failure) {
+            throw new IllegalStateException("Cannot read the supported native maximum-health range", failure);
+        }
+    }
+}

src/main/java/games/dmg/fantasystick/session/NativeMainInventorySwap.java

@@ -0,0 +1,43 @@
+package games.dmg.fantasystick.session;
+
+import java.util.List;
+import java.util.Objects;
+import org.bukkit.inventory.PlayerInventory;
+
+/**
+ * Purpur 2618 main-storage-only exchange, called on the server thread after revalidation.
+ * Public Craft/native accessors (as with NativeHealthLimit), no private-field access.
+ * Native NonNullList.set only replaces a list reference: no item copying, packet emission,
+ * equip notification, menu recomputation or plugin callback between the two writes.
+ * Caller syncs AFTER completing/invalidation of its one-use move. Fail closed on other APIs.
+ * Not a crash-atomic operation or a portable guarantee for arbitrary Inventory adapters.
+ */
+final class NativeMainInventorySwap {
+    private NativeMainInventorySwap() { }
+
+    static void swap(PlayerInventory inventory, int source, int destination) {
+        if (source < 9 || source >= 36 || destination < 9 || destination >= 36) {
+            throw new IllegalArgumentException("Only main storage may be exchanged");
+        }
+        try {
+            var craft = Class.forName("org.bukkit.craftbukkit.inventory.CraftInventoryPlayer");
+            var nativeInventory = Class.forName("net.minecraft.world.entity.player.Inventory");
+            Object handle = craft.getMethod("getInventory").invoke(craft.cast(inventory));
+            Object contents = nativeInventory.getMethod("getNonEquipmentItems").invoke(handle);
+            if (contents.getClass() != Class.forName("net.minecraft.core.NonNullList")
+                    || !(contents instanceof List<?> items) || items.size() != 36) {
+                throw new IllegalStateException("Unsupported native main storage");
+            }
+            exchange(items, source, destination);
+        } catch (ReflectiveOperationException failure) {
+            throw new IllegalStateException("Native main-storage exchange unavailable", failure);
+        }
+    }
+
+    private static <T> void exchange(List<T> items, int source, int destination) {
+        T box = Objects.requireNonNull(items.get(source));
+        T displaced = Objects.requireNonNull(items.get(destination));
+        items.set(destination, box);
+        items.set(source, displaced);
+    }
+}

src/main/java/games/dmg/fantasystick/session/NativeMaximumHealth.java

@@ -0,0 +1,88 @@
+package games.dmg.fantasystick.session;
+
+import java.lang.reflect.Field;
+import java.util.Objects;
+import java.util.function.Consumer;
+import net.minecraft.world.entity.ai.attributes.AttributeInstance;
+
+/**
+ * Purpur 2618 instance-local effective-value lease. Base/modifiers remain in the native
+ * instance, so additions, removals, potion expiry and serialization keep their normal owners.
+ * The pinned dirty callback is synchronous: no polling interval can expose an external maximum.
+ * No global attribute/range is changed. Native compatibility tests must gate runtime upgrades.
+ */
+public final class NativeMaximumHealth implements AutoCloseable {
+    private static final Field DIRTY = field("dirty");
+    private static final Field VALUE = field("cachedValue");
+    private static final Field CALLBACK = field("onDirty");
+    private final AttributeInstance attribute;
+    private final Consumer<AttributeInstance> previous;
+    private final Consumer<AttributeInstance> callback = this::changed;
+    private final double maximum;
+    private boolean closed;
+
+    /** Exercise the pinned hook on a detached instance before exposing any player entry. */
+    public static void prepare() {
+        var probe = new AttributeInstance(net.minecraft.world.entity.ai.attributes.Attributes.MAX_HEALTH, ignored -> {});
+        double bound = Math.min(10, NativeHealthLimit.read().doubleValue());
+        try (var lease = new NativeMaximumHealth(probe, bound)) {
+            Objects.requireNonNull(lease);
+            if (probe.getValue() != bound) throw new IllegalStateException("Native maximum hook did not apply");
+            probe.setBaseValue(probe.getBaseValue() + 1);
+            if (probe.getValue() != bound) throw new IllegalStateException("Native dirty hook did not retain the maximum");
+        }
+        if (probe.getValue() != probe.getAttribute().value().sanitizeValue(probe.getBaseValue())) {
+            throw new IllegalStateException("Native maximum hook did not restore ordinary calculation");
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+    public NativeMaximumHealth(AttributeInstance attribute, double maximum) {
+        this.attribute = Objects.requireNonNull(attribute);
+        if (!Double.isFinite(maximum) || maximum <= 0) throw new IllegalArgumentException("Invalid fantasy maximum");
+        this.maximum = maximum;
+        try { previous = (Consumer<AttributeInstance>) CALLBACK.get(attribute); }
+        catch (ReflectiveOperationException failure) { throw incompatible(failure); }
+        try {
+            CALLBACK.set(attribute, callback);
+            changed(attribute);
+        } catch (ReflectiveOperationException | RuntimeException failure) {
+            try { close(); }
+            catch (RuntimeException cleanup) { failure.addSuppressed(cleanup); }
+            throw incompatible(failure);
+        }
+    }
+
+    private void changed(AttributeInstance changed) {
+        if (!closed) {
+            try {
+                VALUE.setDouble(attribute, maximum);
+                DIRTY.setBoolean(attribute, false);
+            } catch (ReflectiveOperationException failure) { throw incompatible(failure); }
+        }
+        previous.accept(changed);
+    }
+
+    @Override public void close() {
+        if (closed) return;
+        closed = true;
+        try {
+            // Never overwrite a later callback installed by someone else. If it wraps ours,
+            // our now-closed callback simply passes through and no longer overrides values.
+            if (CALLBACK.get(attribute) == callback) CALLBACK.set(attribute, previous);
+            DIRTY.setBoolean(attribute, true);
+            previous.accept(attribute);
+        } catch (ReflectiveOperationException failure) { throw incompatible(failure); }
+    }
+
+    private static Field field(String name) {
+        try {
+            var field = AttributeInstance.class.getDeclaredField(name);
+            field.setAccessible(true);
+            return field;
+        } catch (ReflectiveOperationException failure) { throw incompatible(failure); }
+    }
+    private static IllegalStateException incompatible(Exception failure) {
+        return new IllegalStateException("Unsupported native maximum-health internals; no fallback health policy", failure);
+    }
+}

src/main/java/games/dmg/fantasystick/session/NutritionPolicy.java

@@ -0,0 +1,48 @@
+package games.dmg.fantasystick.session;
+
+import java.util.Objects;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+
+/** Active-session-only hunger/exhaustion suppression; explicit non-food healing remains native. */
+public final class NutritionPolicy implements Listener, AutoCloseable {
+    private final EquipmentSessions sessions;
+    private boolean closed;
+
+    public NutritionPolicy(EquipmentSessions sessions) {
+        this.sessions = Objects.requireNonNull(sessions);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void food(org.bukkit.event.entity.FoodLevelChangeEvent event) {
+        if (!active(event.getEntity())) return;
+        event.setCancelled(true);
+        var player = (Player) event.getEntity();
+        player.setFoodLevel(20);
+        player.setExhaustion(0);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void exhaustion(org.bukkit.event.entity.EntityExhaustionEvent event) {
+        if (!active(event.getEntity())) return;
+        event.setCancelled(true);
+        var player = (Player) event.getEntity();
+        player.setFoodLevel(20);
+        player.setExhaustion(0);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void healing(org.bukkit.event.entity.EntityRegainHealthEvent event) {
+        if (event.getRegainReason() == org.bukkit.event.entity.EntityRegainHealthEvent.RegainReason.SATIATED
+                && active(event.getEntity())) event.setCancelled(true);
+    }
+
+    private boolean active(org.bukkit.entity.Entity entity) {
+        return !closed && entity instanceof Player player
+            && sessions.active(player.getUniqueId()).isPresent();
+    }
+
+    @Override public void close() { closed = true; }
+}

src/main/java/games/dmg/fantasystick/session/SessionClaims.java

@@ -0,0 +1,61 @@
+package games.dmg.fantasystick.session;
+
+import games.dmg.fantasystick.persistence.CharacterRecord;
+import java.util.Optional;
+import java.util.UUID;
+
+/**
+ * Process-local pending/active session exclusion, not persisted character ownership or native activation.
+ * A player can own any number of sheets, but must finish one session before entering another.
+ * The caller retains the claim across asynchronous entry/active callbacks and releases it on failure/exit.
+ * Share one registry across entry routes in this plugin process; separate instances/processes do not coordinate.
+ * No cooldown, equipment, saved-state reconciliation or native health policy is supplied here.
+ */
+public final class SessionClaims implements AutoCloseable {
+    private final java.util.Map<UUID, Claim> players = new java.util.HashMap<>();
+    private final java.util.Map<UUID, Claim> characters = new java.util.HashMap<>();
+    private boolean closed;
+
+    /**
+     * The caller must supply current authoritative saved data, not data copied from an item, and validate
+     * sheet possession, lifecycle, switching deadline and native preflight. This method does no file I/O.
+     */
+    public synchronized Optional<Claim> tryClaim(UUID player, CharacterRecord character) {
+        java.util.Objects.requireNonNull(player);
+        java.util.Objects.requireNonNull(character);
+        if (closed || character.dead() || character.health().signum() == 0
+                || players.containsKey(player) || characters.containsKey(character.id())) return Optional.empty();
+        var claim = new Claim(player, character.id());
+        players.put(player, claim);
+        characters.put(character.id(), claim);
+        return Optional.of(claim);
+    }
+
+    public final class Claim implements AutoCloseable {
+        private final UUID player;
+        private final UUID character;
+        private final UUID session = UUID.randomUUID();
+        private Claim(UUID player, UUID character) { this.player = player; this.character = character; }
+        public UUID playerId() { return player; }
+        public UUID characterId() { return character; }
+        public UUID sessionId() { return session; }
+        /** Lifetime/identity check only: does not re-read saved liveness or authorize native effects. */
+        public boolean isCurrent() {
+            synchronized (SessionClaims.this) {
+                return players.get(player) == this && characters.get(character) == this;
+            }
+        }
+        @Override public void close() {
+            synchronized (SessionClaims.this) {
+                players.remove(player, this);
+                characters.remove(character, this);
+            }
+        }
+    }
+
+    @Override public synchronized void close() {
+        closed = true;
+        players.clear();
+        characters.clear();
+    }
+}

src/main/java/games/dmg/fantasystick/session/SessionVisuals.java

@@ -0,0 +1,41 @@
+package games.dmg.fantasystick.session;
+
+import java.util.Objects;
+import java.util.function.Consumer;
+import org.bukkit.Color;
+import org.bukkit.Particle;
+import org.bukkit.entity.Player;
+import org.bukkit.plugin.Plugin;
+import org.bukkit.scheduler.BukkitTask;
+
+/** Public particles only; never grants gameplay state, protection, health or persistence authority. */
+public final class SessionVisuals implements AutoCloseable {
+    private final EquipmentSessions sessions;
+    private final Consumer<Throwable> failures;
+    private BukkitTask task;
+    private boolean closed;
+
+    public SessionVisuals(EquipmentSessions sessions, Consumer<Throwable> failures) {
+        this.sessions = Objects.requireNonNull(sessions); this.failures = Objects.requireNonNull(failures);
+    }
+    public void install(Plugin plugin) {
+        if (closed || task != null) throw new IllegalStateException("Visual lifetime already used");
+        task = plugin.getServer().getScheduler().runTaskTimer(plugin, () -> {
+            if (closed) return;
+            for (var player : plugin.getServer().getOnlinePlayers()) {
+                try {
+                    var active = sessions.active(player.getUniqueId());
+                    if (active.isPresent() && sessions.current(active.orElseThrow())) burst(player, Color.BLUE, 3);
+                } catch (RuntimeException failure) { failures.accept(failure); }
+            }
+        }, 1L, 10L);
+    }
+    public static void burst(Player player, Color color, int count) {
+        player.getWorld().spawnParticle(Particle.DUST, player.getLocation().add(0, 1, 0), count,
+            0.3, 0.4, 0.3, 0, new Particle.DustOptions(color, 1));
+    }
+    @Override public void close() {
+        closed = true;
+        if (task != null) { task.cancel(); task = null; }
+    }
+}

src/main/java/games/dmg/fantasystick/session/SessionVitals.java

@@ -0,0 +1,189 @@
+package games.dmg.fantasystick.session;
+
+import games.dmg.fantasystick.persistence.CharacterRecord;
+import games.dmg.fantasystick.persistence.OrdinaryVitals;
+import java.math.BigDecimal;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+import java.util.UUID;
+import org.bukkit.NamespacedKey;
+import org.bukkit.attribute.Attribute;
+import org.bukkit.craftbukkit.entity.CraftPlayer;
+import org.bukkit.entity.Player;
+import org.bukkit.persistence.PersistentDataType;
+
+/** Server-thread native overlay; native attributes themselves are never snapshotted/replayed. */
+public final class SessionVitals implements AutoCloseable {
+    private static final NamespacedKey KEY = new NamespacedKey("fantasystick", "vitals_session");
+    private enum Phase { APPLYING, APPLIED, RESTORING, RELEASED }
+    private record Mark(UUID session, Phase phase, double maximum, OrdinaryVitals ordinary) { }
+    private record Lease(UUID session, NativeMaximumHealth maximum) { }
+    private final Map<UUID, Lease> leases = new HashMap<>();
+    private boolean closed;
+
+    public SessionVitals() { NativeMaximumHealth.prepare(); }
+
+    public OrdinaryVitals capture(Player player) {
+        return new OrdinaryVitals(player.getHealth(), player.getFoodLevel(), player.getSaturation(), player.getExhaustion(),
+            player.isHealthScaled(), player.getHealthScale());
+    }
+
+    public boolean available(Player player) {
+        var mark = read(player);
+        return !closed && (!player.getPersistentDataContainer().has(KEY) || mark != null && mark.phase() == Phase.RELEASED);
+    }
+
+    public boolean unchanged(Player player, OrdinaryVitals ordinary) {
+        return ordinary != null && ordinary.health() > 0 && ordinary.equals(capture(player));
+    }
+
+    /** Caller already acknowledged this ordinary snapshot in its player/session receipt. */
+    public void enter(Player player, UUID session, OrdinaryVitals ordinary, CharacterRecord record) {
+        if (!available(player) || !unchanged(player, ordinary) || leases.containsKey(player.getUniqueId())) {
+            throw new IllegalStateException("Stale native vitals entry");
+        }
+        double maximum = record.maximumHealth().min(NativeHealthLimit.read()).doubleValue();
+        write(player, new Mark(session, Phase.APPLYING, maximum, ordinary));
+        var nativeAttribute = Objects.requireNonNull(((CraftPlayer) player).getHandle()
+            .getAttribute(net.minecraft.world.entity.ai.attributes.Attributes.MAX_HEALTH));
+        try {
+            var lease = new NativeMaximumHealth(nativeAttribute, maximum);
+            leases.put(player.getUniqueId(), new Lease(session, lease));
+            // Equal to the actual native maximum, not virtual health. Native attribute packets
+            // use CraftPlayer's scaled snapshot, without exposing ordinary modifier arithmetic.
+            // Initialize once BEFORE display delivery can reenter damage/healing handlers.
+            player.setHealth(Math.min(record.health().doubleValue(), maximum));
+            if (closed) throw new IllegalStateException("Vitals lifetime ended during entry");
+            player.setHealthScale(maximum);
+            if (closed) throw new IllegalStateException("Vitals lifetime ended during entry");
+            player.setFoodLevel(20);
+            player.setExhaustion(0);
+            if (closed) throw new IllegalStateException("Vitals lifetime ended during entry");
+            write(player, new Mark(session, Phase.APPLIED, maximum, ordinary));
+        } catch (RuntimeException | LinkageError failure) {
+            try { releaseMaximum(player, session); }
+            catch (RuntimeException | LinkageError cleanup) { failure.addSuppressed(cleanup); }
+            try { restoreNutrition(player, ordinary); }
+            catch (RuntimeException | LinkageError cleanup) { failure.addSuppressed(cleanup); }
+            try { restoreScale(player, maximum, ordinary); }
+            catch (RuntimeException | LinkageError cleanup) { failure.addSuppressed(cleanup); }
+            // Leave APPLYING proof and the acknowledged receipt: an uncertain health setter
+            // is not permission to heal from a stale snapshot or replay the character save.
+            throw failure;
+        }
+    }
+
+    /** Apply an acknowledged stat revision to the live native health pool exactly once. */
+    public void updateProgress(Player player, UUID session, CharacterRecord previous, CharacterRecord saved) {
+        Objects.requireNonNull(previous);
+        Objects.requireNonNull(saved);
+        var mark = read(player);
+        var lease = leases.get(player.getUniqueId());
+        if (closed || mark == null || mark.phase() != Phase.APPLIED || !mark.session().equals(session)
+                || lease == null || !lease.session().equals(session) || !previous.id().equals(saved.id())
+                || !previous.revision().add(java.math.BigInteger.ONE).equals(saved.revision())) {
+            throw new IllegalStateException("No matching active fantasy vitals revision");
+        }
+        double nextMaximum = saved.maximumHealth().min(NativeHealthLimit.read()).doubleValue();
+        double gain = Math.max(0, nextMaximum - mark.maximum());
+        if (gain == 0 && nextMaximum == mark.maximum()) return;
+        var nativeAttribute = Objects.requireNonNull(((CraftPlayer) player).getHandle()
+            .getAttribute(net.minecraft.world.entity.ai.attributes.Attributes.MAX_HEALTH));
+        lease.maximum().close();
+        var replacement = new NativeMaximumHealth(nativeAttribute, nextMaximum);
+        leases.put(player.getUniqueId(), new Lease(session, replacement));
+        player.setHealth(Math.min(nextMaximum, player.getHealth() + gain));
+        player.setHealthScale(nextMaximum);
+        write(player, new Mark(session, Phase.APPLIED, nextMaximum, mark.ordinary()));
+    }
+
+    public BigDecimal remaining(Player player, UUID session, OrdinaryVitals ordinary) {
+        var mark = read(player);
+        if (mark == null || !mark.session().equals(session) || !mark.ordinary().equals(ordinary) || mark.phase() != Phase.APPLIED) {
+            throw new IllegalStateException("No matching applied fantasy vitals proof");
+        }
+        return BigDecimal.valueOf(Math.max(0, Math.min(player.getHealth(), mark.maximum())));
+    }
+
+    public boolean restore(Player player, UUID session, OrdinaryVitals ordinary) {
+        if (ordinary == null) return true; // Legacy equipment-only receipt, not health restoration authority.
+        var mark = read(player);
+        if (mark == null || !mark.session().equals(session) || !mark.ordinary().equals(ordinary)
+                || mark.phase() != Phase.APPLIED) {
+            // Process-local hook ownership is sufficient to retire our maximum override,
+            // never to replay ordinary health/nutrition when native setter proof is missing.
+            releaseMaximum(player, session);
+            return mark != null && mark.session().equals(session) && mark.ordinary().equals(ordinary) && mark.phase() == Phase.RELEASED;
+        }
+        write(player, new Mark(session, Phase.RESTORING, mark.maximum(), ordinary));
+        // Reconcile restored equipment's native modifiers before clamping ordinary health.
+        try { ((CraftPlayer) player).getHandle().detectEquipmentUpdates(); }
+        finally { releaseMaximum(player, session); }
+        // On restart there is no hook: native attribute serialization retained ordinary
+        // base/permanent modifiers, and the native effect lifecycle owns potion expiry/removal.
+        // CraftPlayer scale setters send health packets immediately (or queue one for damage
+        // completion). Restore positive health first: a zero-health packet opens a client death
+        // screen even when Paper cancels the death and the server-side player survives.
+        player.setHealth(Math.min(ordinary.health(), Objects.requireNonNull(player.getAttribute(Attribute.MAX_HEALTH)).getValue()));
+        restoreNutrition(player, ordinary);
+        restoreScale(player, mark.maximum(), ordinary);
+        write(player, new Mark(session, Phase.RELEASED, mark.maximum(), ordinary));
+        return true;
+    }
+
+    private void releaseMaximum(Player player, UUID session) {
+        var lease = leases.get(player.getUniqueId());
+        if (lease != null && lease.session().equals(session)) {
+            leases.remove(player.getUniqueId(), lease);
+            lease.maximum().close();
+        }
+    }
+
+    private static void restoreNutrition(Player player, OrdinaryVitals ordinary) {
+        player.setFoodLevel(ordinary.food());
+        player.setSaturation(ordinary.saturation());
+        player.setExhaustion(ordinary.exhaustion());
+    }
+
+    private static void restoreScale(Player player, double maximum, OrdinaryVitals ordinary) {
+        if (player.isHealthScaled() && player.getHealthScale() == maximum) {
+            player.setHealthScale(ordinary.scale());
+            player.setHealthScaled(ordinary.scaled());
+        }
+    }
+
+    /** Only removes this process's effective-value hooks; never replays unknown ordinary snapshots. */
+    @Override public void close() {
+        closed = true;
+        RuntimeException errors = null;
+        for (var lease : java.util.List.copyOf(leases.values())) {
+            try { lease.maximum().close(); }
+            catch (RuntimeException | LinkageError failure) {
+                if (errors == null) errors = new IllegalStateException("Native maximum cleanup failed");
+                errors.addSuppressed(failure);
+            }
+        }
+        leases.clear();
+        if (errors != null) throw errors;
+    }
+
+    private static Mark read(Player player) {
+        var data = player.getPersistentDataContainer();
+        if (!data.has(KEY, PersistentDataType.STRING)) return null;
+        try {
+            String encoded = data.get(KEY, PersistentDataType.STRING);
+            if (encoded.length() > 400) return null;
+            String[] fields = encoded.split("\\|", -1);
+            if (fields.length != 5 || !fields[0].equals("1")) return null;
+            UUID session = UUID.fromString(fields[1]);
+            double maximum = Double.parseDouble(fields[3]);
+            if (!session.toString().equals(fields[1]) || !Double.isFinite(maximum) || maximum <= 0) return null;
+            return new Mark(session, Phase.valueOf(fields[2]), maximum, OrdinaryVitals.decode(fields[4]));
+        } catch (IllegalArgumentException invalid) { return null; }
+    }
+    private static void write(Player player, Mark mark) {
+        player.getPersistentDataContainer().set(KEY, PersistentDataType.STRING,
+            "1|" + mark.session() + "|" + mark.phase() + "|" + mark.maximum() + "|" + mark.ordinary().encode());
+    }
+}

src/main/resources/config.yml

@@ -0,0 +1,23 @@
+# Captured when a new fantasy session starts; changing this does not alter active sessions.
+# Admin command: /fantasystick config adventure-mode [true|false]
+adventure-mode: true
+
+# Real-time delay before this player may enter a different character after exit.
+character-swap-cooldown-seconds: 900
+
+# New-character and transferable fantasy progression defaults.
+starting-points: 40
+xp-per-level: 100
+maximum-level: 30
+
+# Character-bound combat rewards. Restricted hostile/neutral/boss history uses mob death positions.
+passive-xp: 1
+ordinary-xp: 10
+boss-xp: 100
+restricted-kill-spacing-blocks: 3
+
+# Fireball defaults from the reviewed starter catalogue.
+fireball-base-damage: 6
+fireball-cooldown-seconds: 4
+fireball-range-blocks: 32
+fireball-lifetime-seconds: 5

src/main/resources/plugin.yml

@@ -2,5 +2,15 @@ name: FantasyStick
 version: ${version}
 main: games.dmg.fantasystick.FantasyStickPlugin
 api-version: "26.2"
-description: Transferable RPG characters for SoMC; bootstrap only, gameplay not implemented.
+depend: [ProtocolLib]
+description: Transferable characters, native fantasy health, recoverable equipment, character books and parties.
 author: dmg.games
+commands:
+  fantasystick:
+    description: Inspect/recover equipment sessions or configure fantasy mode.
+    usage: /fantasystick <inspect|recover> <player-uuid> | config adventure-mode [true|false]
+    permission: fantasystick.admin
+permissions:
+  fantasystick.admin:
+    description: Inspect/recover equipment sessions and configure fantasy mode.
+    default: op

src/nativeTest/java/games/dmg/fantasystick/AbilityEngineNativeTest.java

@@ -0,0 +1,225 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import games.dmg.fantasystick.ability.AbilityDefinition;
+import games.dmg.fantasystick.ability.AbilityRegistry;
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import games.dmg.fantasystick.session.ControlInput;
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.nio.file.Path;
+import java.time.Duration;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicInteger;
+import org.bukkit.Material;
+import org.bukkit.event.block.Action;
+import org.bukkit.inventory.EquipmentSlot;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class AbilityEngineNativeTest {
+    @TempDir Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test void executionContractsRevalidateTargetsBoundAreasReportOnlyEffectsAndCleanOwnedWork() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var registry = new AbilityRegistry();
+            var reports = new java.util.ArrayList<games.dmg.fantasystick.ability.AbilityReport>();
+            var delayed = new java.util.ArrayList<Runnable>();
+            var closedResources = new AtomicInteger();
+            var delayedEffects = new AtomicInteger();
+            var selectionEffects = new AtomicInteger();
+            var allyEffects = new AtomicInteger();
+            var exceptionalEffects = new AtomicInteger();
+            var areaRecipients = new java.util.ArrayList<org.bukkit.entity.Entity>();
+            var areaCandidates = new java.util.concurrent.atomic.AtomicReference<List<? extends org.bukkit.entity.Entity>>(List.of());
+            registry.register(definition("report_test", AbilityDefinition.Activation.IMMEDIATE,
+                AbilityDefinition.TargetPolicy.HOSTILE, execution -> {
+                    for (var type : games.dmg.fantasystick.ability.AbilityReport.Type.values()) {
+                        execution.report(type, execution.input().target(), BigDecimal.valueOf(2));
+                    }
+                }));
+            registry.register(definition("area_test", AbilityDefinition.Activation.IMMEDIATE,
+                AbilityDefinition.TargetPolicy.AREA, execution -> areaRecipients.addAll(execution.eligible(areaCandidates.get(), 2))));
+            registry.register(definition("delayed_test", AbilityDefinition.Activation.DELAYED,
+                AbilityDefinition.TargetPolicy.PARTY, execution -> execution.later(Duration.ofSeconds(1), () -> {
+                    delayedEffects.incrementAndGet(); execution.finish();
+                })));
+            registry.register(definition("selection_test", AbilityDefinition.Activation.SELECTION,
+                AbilityDefinition.TargetPolicy.SELECTION, execution -> execution.later(Duration.ofSeconds(1), () -> {
+                    selectionEffects.incrementAndGet(); execution.finish();
+                })));
+            registry.register(definition("projectile_test", AbilityDefinition.Activation.PROJECTILE,
+                AbilityDefinition.TargetPolicy.HOSTILE, execution -> execution.own(closedResources::incrementAndGet)));
+            registry.register(definition("ally_test", AbilityDefinition.Activation.IMMEDIATE,
+                AbilityDefinition.TargetPolicy.ALLY, execution -> allyEffects.incrementAndGet()));
+            registry.register(definition("exception_test", AbilityDefinition.Activation.IMMEDIATE,
+                AbilityDefinition.TargetPolicy.EXCEPTIONAL_NONCOMBAT, execution -> exceptionalEffects.incrementAndGet()));
+
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            var b = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player); f.players.put(b.core.id, b.player);
+            prepare(data, a, List.of("report_test", "area_test", "delayed_test", "selection_test", "projectile_test", "ally_test", "exception_test"));
+            f.activate(a); f.activate(b);
+            var sessions = (games.dmg.fantasystick.session.EquipmentSessions)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "sessions");
+            var parties = PartyLifecycleNativeTest.parties(f);
+            var party = parties.create(a.core.id).orElseThrow();
+            assertTrue(parties.accept(b.core.id, parties.invite(a.core.id, party.id(), b.core.id).orElseThrow().id()));
+            games.dmg.fantasystick.ability.AbilityScheduler scheduler = (delay, action) -> {
+                delayed.add(action); return closedResources::incrementAndGet;
+            };
+            var engine = new games.dmg.fantasystick.ability.AbilityEngine(registry,
+                (CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters"), sessions, parties,
+                java.time.Clock.fixed(java.time.Instant.parse("2026-09-19T20:00:00Z"), java.time.ZoneOffset.UTC),
+                f.tasks::add, scheduler, reports::add, failure -> fail(failure.toString()));
+            var active = sessions.active(a.core.id).orElseThrow();
+            var hostile = org.mockito.Mockito.mock(org.bukkit.entity.LivingEntity.class);
+            org.mockito.Mockito.when(hostile.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+            cast(engine, f, a, active, 2, "report_test", hostile);
+            assertEquals(java.util.Set.copyOf(java.util.Arrays.asList(games.dmg.fantasystick.ability.AbilityReport.Type.values())),
+                reports.stream().map(games.dmg.fantasystick.ability.AbilityReport::type).collect(java.util.stream.Collectors.toSet()));
+            assertEquals(5, reports.size());
+            assertEquals(a.core.record.id(), reports.getFirst().sourceCharacter());
+
+            var ordinary = org.mockito.Mockito.mock(org.bukkit.entity.Player.class);
+            org.mockito.Mockito.when(ordinary.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+            areaCandidates.set(List.of(hostile, ordinary, b.player));
+            active = sessions.active(a.core.id).orElseThrow();
+            cast(engine, f, a, active, 3, "area_test", null);
+            assertEquals(List.of(hostile, b.player), areaRecipients);
+            assertEquals(5, reports.size(), "Casting and no-op/recipient discovery do not manufacture reports");
+
+            active = sessions.active(a.core.id).orElseThrow();
+            cast(engine, f, a, active, 7, "ally_test", b.player);
+            assertEquals(1, allyEffects.get());
+            active = sessions.active(a.core.id).orElseThrow();
+            cast(engine, f, a, active, 8, "exception_test", ordinary);
+            assertEquals(1, exceptionalEffects.get(), "Explicit non-combat policy may select an ordinary player");
+
+            active = sessions.active(a.core.id).orElseThrow();
+            cast(engine, f, a, active, 4, "delayed_test", b.player);
+            assertEquals(1, delayed.size());
+            assertTrue(parties.leave(a.core.id, party.id()));
+            delayed.removeFirst().run();
+            assertEquals(0, delayedEffects.get(), "Party eligibility is rechecked at delayed application");
+
+            active = sessions.active(a.core.id).orElseThrow();
+            cast(engine, f, a, active, 5, "selection_test", b.player);
+            assertEquals(1, delayed.size());
+            engine.remove(a.core.record.id(), "selection_test");
+            delayed.removeFirst().run();
+            assertEquals(0, selectionEffects.get(), "Removal invalidates pending selection callbacks without clearing cooldowns");
+            var stored = ((CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters"))
+                .find(a.core.record.id()).get().orElseThrow();
+            assertTrue(stored.cooldowns().containsKey("selection_test"));
+
+            active = sessions.active(a.core.id).orElseThrow();
+            cast(engine, f, a, active, 6, "projectile_test", hostile);
+            int beforeExit = closedResources.get();
+            PartyCombatNativeTest.exit(f, a);
+            engine.sweep();
+            assertEquals(beforeExit + 1, closedResources.get(), "Session end cleans the projectile definition's owned resource");
+            engine.close();
+            assertEquals(beforeExit + 1, closedResources.get(), "Repeated engine cleanup cannot close owned state twice");
+        }
+    }
+
+    @Test void registeredTestDefinitionUsesRealBookPersistenceControlAndCastRoutes() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var registry = (AbilityRegistry) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "abilityRegistry");
+            var effects = new AtomicInteger();
+            registry.register(new AbilityDefinition("test_focus", "Test Focus", Material.AMETHYST_SHARD,
+                List.of("A registered test effect"), "Use the equipped shard", Map.of(), BigInteger.ONE,
+                AbilityDefinition.Activation.IMMEDIATE, ControlInput.Gesture.USE, Duration.ofSeconds(4),
+                Map.of("range", BigDecimal.valueOf(12)), AbilityDefinition.TargetPolicy.SELF,
+                execution -> { assertTrue(execution.stillCurrent()); effects.incrementAndGet(); }));
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); f.players.put(a.core.id, a.player); f.activate(a);
+            a.core.inventory.getInventory().setSelectedSlot(0);
+
+            PartyBookNativeTest.open(f, a);
+            String available = PartyBookNativeTest.text(a);
+            String compactAvailable = available.replaceAll("\\s+", "");
+            assertTrue(compactAvailable.contains("TestFocus"), available);
+            assertTrue(compactAvailable.contains("AMETHYST_SHARD"), available);
+            assertTrue(compactAvailable.contains("Cost:1"), available);
+            assertTrue(compactAvailable.contains("Cooldown:4s"), available);
+            var learn = PartyBookNativeTest.button(a, "[Learn]");
+            PartyBookNativeTest.click(f, a, learn); PartyBookNativeTest.click(f, a, learn);
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var storage = (CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            var learned = storage.find(a.core.record.id()).get().orElseThrow();
+            assertEquals(java.util.Set.of("test_focus"), learned.learned());
+            assertEquals(BigInteger.valueOf(39), learned.unspentPoints(), "Repeated stale book action cannot spend twice");
+
+            var assign = PartyBookNativeTest.button(a, "[3]");
+            PartyBookNativeTest.click(f, a, assign); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var assigned = storage.find(a.core.record.id()).get().orElseThrow();
+            assertEquals("test_focus", assigned.loadout().getFirst());
+            var control = a.core.inventory.getItem(2);
+            assertEquals(Material.AMETHYST_SHARD, control.getType());
+            assertEquals("test_focus", new games.dmg.fantasystick.items.SessionControls(registry).ability(control).orElseThrow());
+
+            a.core.inventory.getInventory().setSelectedSlot(2);
+            var cast = new org.bukkit.event.player.PlayerInteractEvent(a.player, Action.RIGHT_CLICK_AIR, control,
+                null, org.bukkit.block.BlockFace.SELF, EquipmentSlot.HAND);
+            f.dispatcher.accept(cast); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            assertEquals(org.bukkit.event.Event.Result.DENY, cast.useItemInHand());
+            assertEquals(1, effects.get());
+            var cooled = storage.find(a.core.record.id()).get().orElseThrow();
+            assertTrue(cooled.cooldowns().get("test_focus").isAfter(java.time.Instant.now()));
+
+            f.dispatcher.accept(new org.bukkit.event.player.PlayerInteractEvent(a.player, Action.RIGHT_CLICK_AIR,
+                a.core.inventory.getItem(2), null, org.bukkit.block.BlockFace.SELF, EquipmentSlot.HAND));
+            PartyBookNativeTest.drain(f);
+            assertEquals(1, effects.get(), "The persisted character deadline refuses an immediate repeated cast");
+            assertTrue(a.messages.stream().anyMatch(message -> message.contains("ready in")));
+
+            var sheet = a.core.inventory.getItemInOffHand().clone();
+            a.core.inventory.setItemInOffHand(null); f.changed(a);
+            PartyBookNativeTest.drain(f); f.awaitCharacterAndReceipt(a);
+            a.core.inventory.setItemInOffHand(sheet); f.activate(a);
+            a.core.inventory.getInventory().setSelectedSlot(2);
+            assertEquals("test_focus", new games.dmg.fantasystick.items.SessionControls(registry)
+                .ability(a.core.inventory.getItem(2)).orElseThrow());
+            f.dispatcher.accept(new org.bukkit.event.player.PlayerInteractEvent(a.player, Action.RIGHT_CLICK_AIR,
+                a.core.inventory.getItem(2), null, org.bukkit.block.BlockFace.SELF, EquipmentSlot.HAND));
+            PartyBookNativeTest.drain(f);
+            assertEquals(1, effects.get(), "Exit/resume cannot reset the persisted character cooldown");
+            assertEquals(cooled.cooldowns(), storage.find(a.core.record.id()).get().orElseThrow().cooldowns());
+        }
+    }
+
+    private static AbilityDefinition definition(String id, AbilityDefinition.Activation activation,
+            AbilityDefinition.TargetPolicy targetPolicy, games.dmg.fantasystick.ability.AbilityEffect effect) {
+        return new AbilityDefinition(id, id, Material.AMETHYST_SHARD, List.of("Test definition"), "Use test input",
+            Map.of(), BigInteger.ONE, activation, ControlInput.Gesture.USE, Duration.ZERO,
+            Map.of(), targetPolicy, effect);
+    }
+
+    private static void prepare(Path data, FantasyStickLifecycleNativeTest.Actor actor, List<String> loadout) throws Exception {
+        var repository = new games.dmg.fantasystick.persistence.YamlCharacterRepository(data);
+        var old = repository.load(actor.core.record.id()).orElseThrow();
+        var learned = loadout.stream().filter(id -> !id.isEmpty()).collect(java.util.stream.Collectors.toSet());
+        var saved = new games.dmg.fantasystick.persistence.CharacterRecord(old.id(), old.name(), old.revision().add(BigInteger.ONE),
+            old.stats(), old.level(), old.experience(), old.unspentPoints(), old.health(), learned, loadout,
+            old.cooldowns(), old.restrictedKills(), false, null, null);
+        repository.replace(saved, old.revision());
+    }
+
+    private static void cast(games.dmg.fantasystick.ability.AbilityEngine engine,
+            FantasyStickLifecycleNativeTest.Fixture fixture, FantasyStickLifecycleNativeTest.Actor actor,
+            games.dmg.fantasystick.session.EquipmentSessions.Active active, int slot, String id,
+            org.bukkit.entity.Entity target) throws Exception {
+        var sessions = (games.dmg.fantasystick.session.EquipmentSessions)
+            FantasyStickLifecycleNativeTest.Fixture.field(fixture.plugin, "sessions");
+        engine.accept(new ControlInput(actor.player, active, slot, id, ControlInput.Kind.ABILITY,
+            ControlInput.Gesture.USE, target, 0, 0, () -> sessions.current(active)));
+        PartyBookNativeTest.drain(fixture);
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/AbilityRegistryNativeTest.java

@@ -0,0 +1,90 @@
+package games.dmg.fantasystick;
+
+import games.dmg.fantasystick.ability.AbilityDefinition;
+import games.dmg.fantasystick.ability.AbilityRegistry;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import games.dmg.fantasystick.progression.Stat;
+import games.dmg.fantasystick.session.ControlInput;
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.time.Duration;
+import java.util.List;
+import java.util.Map;
+import org.bukkit.Material;
+import org.junit.jupiter.api.Test;
+
+class AbilityRegistryNativeTest {
+    @org.junit.jupiter.api.BeforeAll static void bootstrap() throws Exception {
+        games.dmg.fantasystick.NativeRuntime.bootstrap();
+    }
+    @Test void registersCompleteStableDefinitionsAndRejectsDuplicateIds() {
+        var registry = new AbilityRegistry();
+        var definition = definition("test_bolt");
+        registry.register(definition);
+        assertSame(definition, registry.find("test_bolt").orElseThrow());
+        assertEquals(List.of(definition), registry.definitions());
+        assertThrows(IllegalArgumentException.class, () -> registry.register(definition("test_bolt")));
+        assertTrue(registry.find("unknown_saved_id").isEmpty());
+        assertTrue(registry.find("basic_attack").isEmpty(), "The built-in stick is not a learned/refundable definition");
+    }
+
+    @Test void rejectsMalformedMetadataRequirementsAndNumericParametersBeforeRegistration() {
+        var valid = definition("valid");
+        assertAll(
+            () -> assertThrows(IllegalArgumentException.class, () -> copy(valid, "UPPER", valid.requirements(), valid.parameters(), valid.cooldown())),
+            () -> assertThrows(IllegalArgumentException.class, () -> copy(valid, "", valid.requirements(), valid.parameters(), valid.cooldown())),
+            () -> assertThrows(IllegalArgumentException.class, () -> new AbilityDefinition("x", " ", Material.STONE,
+                List.of("Lore"), "Use", Map.of(Stat.INT, BigInteger.TEN), BigInteger.ONE,
+                AbilityDefinition.Activation.IMMEDIATE, ControlInput.Gesture.USE, Duration.ZERO,
+                Map.of(), AbilityDefinition.TargetPolicy.HOSTILE, ignored -> {})),
+            () -> assertThrows(IllegalArgumentException.class, () -> copy(valid, "low", Map.of(Stat.INT, BigInteger.valueOf(9)), Map.of(), Duration.ZERO)),
+            () -> assertThrows(IllegalArgumentException.class, () -> copy(valid, "negative", valid.requirements(), Map.of("range", BigDecimal.valueOf(-1)), Duration.ZERO)),
+            () -> assertThrows(IllegalArgumentException.class, () -> copy(valid, "infinite", valid.requirements(), Map.of("range", new BigDecimal("1E1000000")), Duration.ZERO)),
+            () -> assertThrows(IllegalArgumentException.class, () -> copy(valid, "cooldown", valid.requirements(), Map.of(), Duration.ofSeconds(-1))),
+            () -> assertThrows(IllegalArgumentException.class, () -> copy(valid, "long_cooldown", valid.requirements(), Map.of(), Duration.ofDays(366))),
+            () -> assertThrows(IllegalArgumentException.class, () -> new AbilityDefinition("air", "Air", Material.AIR,
+                List.of("Lore"), "Use", Map.of(), BigInteger.ONE, AbilityDefinition.Activation.IMMEDIATE,
+                ControlInput.Gesture.USE, Duration.ZERO, Map.of(), AbilityDefinition.TargetPolicy.SELF, ignored -> {}))
+        );
+    }
+
+    @Test void effectReportsRequireActualPositiveFiniteEvidence() {
+        var character = java.util.UUID.randomUUID(); var session = java.util.UUID.randomUUID(); var target = java.util.UUID.randomUUID();
+        var now = java.time.Instant.parse("2026-09-19T20:00:00Z");
+        for (var type : games.dmg.fantasystick.ability.AbilityReport.Type.values()) {
+            assertDoesNotThrow(() -> new games.dmg.fantasystick.ability.AbilityReport(type, character, session, target,
+                BigDecimal.ONE, now));
+            assertThrows(IllegalArgumentException.class, () -> new games.dmg.fantasystick.ability.AbilityReport(type,
+                character, session, target, BigDecimal.ZERO, now));
+            assertThrows(IllegalArgumentException.class, () -> new games.dmg.fantasystick.ability.AbilityReport(type,
+                character, session, target, new BigDecimal("1E1000000"), now));
+        }
+    }
+
+    @Test void definitionsSupportEveryBoundedExecutionStyleAndTargetBoundary() {
+        for (var activation : AbilityDefinition.Activation.values()) {
+            for (var policy : AbilityDefinition.TargetPolicy.values()) {
+                var base = definition("x");
+                assertDoesNotThrow(() -> new AbilityDefinition("a_" + activation.name().toLowerCase() + "_" + policy.name().toLowerCase(),
+                    base.name(), base.icon(), base.lore(), base.instructions(), base.requirements(), base.pointCost(), activation,
+                    base.gesture(), base.cooldown(), base.parameters(), policy, base.effect()));
+            }
+        }
+    }
+
+    static AbilityDefinition definition(String id) {
+        return new AbilityDefinition(id, "Test Bolt", Material.AMETHYST_SHARD, List.of("A focused test effect"),
+            "Use the equipped control", Map.of(Stat.INT, BigInteger.valueOf(12)), BigInteger.ONE,
+            AbilityDefinition.Activation.PROJECTILE, ControlInput.Gesture.USE, Duration.ofSeconds(4),
+            Map.of("range", BigDecimal.valueOf(12), "duration", BigDecimal.valueOf(5)),
+            AbilityDefinition.TargetPolicy.HOSTILE, ignored -> {});
+    }
+
+    private static AbilityDefinition copy(AbilityDefinition value, String id, Map<Stat, BigInteger> requirements,
+                                          Map<String, BigDecimal> parameters, Duration cooldown) {
+        return new AbilityDefinition(id, value.name(), value.icon(), value.lore(), value.instructions(), requirements,
+            value.pointCost(), value.activation(), value.gesture(), cooldown, parameters, value.targetPolicy(), value.effect());
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/AdventureModeLeaseNativeTest.java

@@ -0,0 +1,111 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+import games.dmg.fantasystick.session.AdventureModeLease;
+import java.util.UUID;
+import java.util.concurrent.atomic.AtomicReference;
+import org.bukkit.GameMode;
+import org.bukkit.entity.Player;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+class AdventureModeLeaseNativeTest {
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test void changesAndRestoresOnlyTheAcknowledgedHoldersOriginalMode() {
+        for (var original : new GameMode[]{GameMode.SURVIVAL, GameMode.CREATIVE, GameMode.SPECTATOR}) {
+            var actor = new Actor(original);
+            var lease = new AdventureModeLease();
+            var session = UUID.randomUUID();
+            assertTrue(lease.enter(actor.player, session, original.name()));
+            assertEquals(GameMode.ADVENTURE, actor.mode.get());
+            assertTrue(lease.restore(actor.player, session, original.name()));
+            assertEquals(original, actor.mode.get());
+            assertTrue(lease.restore(actor.player, session, original.name()));
+            assertEquals(original, actor.mode.get());
+        }
+    }
+
+    @Test void adminChangeAwayAndBackToAdventureRelinquishesOriginalRestoration() {
+        var actor = new Actor(GameMode.CREATIVE);
+        var lease = new AdventureModeLease(); var session = UUID.randomUUID();
+        assertTrue(lease.enter(actor.player, session, "CREATIVE"));
+        actor.mode.set(GameMode.SURVIVAL);
+        // Native event is dispatched before the second external mode change takes effect.
+        var event = new org.bukkit.event.player.PlayerGameModeChangeEvent(actor.player, GameMode.ADVENTURE);
+        lease.changed(event);
+        actor.mode.set(GameMode.ADVENTURE);
+        assertTrue(lease.restore(actor.player, session, "CREATIVE"));
+        assertEquals(GameMode.ADVENTURE, actor.mode.get(), "Do not override the administrator's final mode");
+    }
+
+    @Test void nativeVetoesLeaveEntryUntouchedAndRestorationRetryableWithoutClaimingSuccess() {
+        var actor = new Actor(GameMode.SURVIVAL); var lease = new AdventureModeLease(); var session = UUID.randomUUID();
+        actor.change = ignored -> {};
+        assertFalse(lease.enter(actor.player, session, "SURVIVAL"));
+        assertEquals(GameMode.SURVIVAL, actor.mode.get()); assertTrue(lease.available(actor.player));
+        actor.change = actor.mode::set;
+        assertTrue(lease.enter(actor.player, session, "SURVIVAL"));
+        actor.change = ignored -> {};
+        assertFalse(lease.restore(actor.player, session, "SURVIVAL"));
+        assertEquals(GameMode.ADVENTURE, actor.mode.get()); assertFalse(lease.available(actor.player));
+        actor.change = actor.mode::set;
+        assertTrue(lease.restore(actor.player, session, "SURVIVAL"));
+        assertEquals(GameMode.SURVIVAL, actor.mode.get());
+    }
+
+    @Test void serializedMatchingProofRecoversButMissingWrongOrInterruptedProofNeverGuesses() throws Exception {
+        var actor = new Actor(GameMode.CREATIVE); var session = UUID.randomUUID();
+        assertTrue(new AdventureModeLease().enter(actor.player, session, "CREATIVE"));
+        var reloaded = new Actor(GameMode.ADVENTURE);
+        reloaded.pdc.readFromBytes(actor.pdc.serializeToBytes(), true);
+        var lease = new AdventureModeLease();
+        assertFalse(lease.restore(reloaded.player, UUID.randomUUID(), "CREATIVE"));
+        assertFalse(lease.restore(reloaded.player, session, "SURVIVAL"));
+        assertEquals(GameMode.ADVENTURE, reloaded.mode.get());
+        assertTrue(lease.restore(reloaded.player, session, "CREATIVE"));
+        assertEquals(GameMode.CREATIVE, reloaded.mode.get());
+        var key = new org.bukkit.NamespacedKey("fantasystick", "adventure_session");
+        for (String phase : new String[]{"APPLYING", "RESTORING", "unknown"}) {
+            reloaded.mode.set(GameMode.ADVENTURE);
+            reloaded.pdc.set(key, org.bukkit.persistence.PersistentDataType.STRING, "1|" + session + "|CREATIVE|" + phase);
+            var before = reloaded.pdc.serializeToBytes();
+            assertFalse(lease.restore(reloaded.player, session, "CREATIVE"));
+            assertArrayEquals(before, reloaded.pdc.serializeToBytes());
+            assertEquals(GameMode.ADVENTURE, reloaded.mode.get());
+        }
+        reloaded.pdc.remove(key);
+        assertFalse(lease.restore(reloaded.player, session, "CREATIVE"));
+    }
+
+    @Test void setterExceptionsRetainAmbiguousProofWithoutAutomaticRetryAndDisabledNeverTouchesMode() {
+        var actor = new Actor(GameMode.SURVIVAL); var lease = new AdventureModeLease(); var session = UUID.randomUUID();
+        actor.change = ignored -> { throw new IllegalStateException("uncertain"); };
+        assertTrue(lease.enter(actor.player, session, null)); assertTrue(lease.restore(actor.player, session, null));
+        assertTrue(lease.available(actor.player));
+        assertThrows(IllegalStateException.class, () -> lease.enter(actor.player, session, "SURVIVAL"));
+        assertFalse(lease.restore(actor.player, session, "SURVIVAL"));
+        assertFalse(lease.available(actor.player));
+    }
+
+    static final class Actor {
+        final UUID id = UUID.randomUUID();
+        final AtomicReference<GameMode> mode;
+        java.util.function.Consumer<GameMode> change;
+        final org.bukkit.craftbukkit.persistence.CraftPersistentDataContainer pdc =
+            new org.bukkit.craftbukkit.persistence.CraftPersistentDataContainer(
+                new org.bukkit.craftbukkit.persistence.CraftPersistentDataTypeRegistry());
+        final Player player;
+        Actor(GameMode original) {
+            mode = new AtomicReference<>(original);
+            change = mode::set;
+            player = FantasyStickLifecycleNativeTest.port(Player.class, (name, args) -> switch (name) {
+                case "getUniqueId" -> id;
+                case "getGameMode" -> mode.get();
+                case "setGameMode" -> { change.accept((GameMode) args[0]); yield null; }
+                case "getPersistentDataContainer" -> pdc;
+                default -> throw new AssertionError(name);
+            });
+        }
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/BasicAttackNativeTest.java

@@ -0,0 +1,114 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+import java.nio.file.Path;
+import java.time.Clock;
+import java.time.Instant;
+import java.time.ZoneId;
+import java.time.ZoneOffset;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class BasicAttackNativeTest {
+    @TempDir Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test void successfulHitsStartAnExactOneSecondCadenceButCancelledDamageDoesNot() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player); f.activate(a);
+            var sessions = (games.dmg.fantasystick.session.EquipmentSessions)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "sessions");
+            var active = sessions.active(a.core.id).orElseThrow();
+            var clock = new MutableClock(Instant.parse("2026-09-19T00:00:00Z"));
+            var basic = new games.dmg.fantasystick.combat.BasicAttack(sessions, clock);
+            var target = mock(org.bukkit.entity.LivingEntity.class);
+            var cancelled = new java.util.concurrent.atomic.AtomicBoolean(true);
+            doAnswer(call -> {
+                var source = mock(org.bukkit.damage.DamageSource.class);
+                when(source.getCausingEntity()).thenReturn(a.player);
+                when(source.getDirectEntity()).thenReturn(a.player);
+                var event = new org.bukkit.event.entity.EntityDamageByEntityEvent(a.player, target,
+                    org.bukkit.event.entity.EntityDamageEvent.DamageCause.ENTITY_ATTACK, source, (Double) call.getArgument(0));
+                event.setCancelled(cancelled.get());
+                basic.acceptedDamage(event);
+                return null;
+            }).when(target).damage(anyDouble(), same(a.player));
+            var input = new games.dmg.fantasystick.session.ControlInput(a.player, active, 1, "",
+                games.dmg.fantasystick.session.ControlInput.Kind.BASIC_ATTACK,
+                games.dmg.fantasystick.session.ControlInput.Gesture.ATTACK, target, 0, 1,
+                () -> sessions.current(active));
+            basic.accept(input); // Cancelled: no cadence spent.
+            cancelled.set(false);
+            basic.accept(input); // Accepted at t=0.
+            clock.advance(java.time.Duration.ofMillis(999)); basic.accept(input);
+            verify(target, times(2)).damage(1.0, a.player);
+            clock.advance(java.time.Duration.ofMillis(1)); basic.accept(input);
+            verify(target, times(3)).damage(1.0, a.player);
+            a.core.inventory.setItemInOffHand(null); f.changed(a);
+            clock.advance(java.time.Duration.ofSeconds(1)); basic.accept(input);
+            verifyNoMoreInteractions(target);
+        }
+    }
+
+    @Test void partyCancellationPreventsDamageAndDoesNotSpendThePackagedAttackCadence() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            var b = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player); f.players.put(b.core.id, b.player);
+            f.activate(a); f.activate(b);
+            var parties = PartyLifecycleNativeTest.parties(f);
+            var party = parties.create(a.core.id).orElseThrow();
+            assertTrue(parties.accept(b.core.id, parties.invite(a.core.id, party.id(), b.core.id).orElseThrow().id()));
+            var events = new java.util.ArrayList<org.bukkit.event.entity.EntityDamageByEntityEvent>();
+            doAnswer(call -> {
+                var source = mock(org.bukkit.damage.DamageSource.class);
+                when(source.getCausingEntity()).thenReturn(a.player);
+                when(source.getDirectEntity()).thenReturn(a.player);
+                var event = new org.bukkit.event.entity.EntityDamageByEntityEvent(a.player, b.player,
+                    org.bukkit.event.entity.EntityDamageEvent.DamageCause.ENTITY_ATTACK, source, (Double) call.getArgument(0));
+                events.add(event); f.dispatcher.accept(event); return null;
+            }).when(b.player).damage(anyDouble(), same(a.player));
+            a.core.inventory.getInventory().setSelectedSlot(1);
+            f.dispatcher.accept(new io.papermc.paper.event.player.PrePlayerAttackEntityEvent(a.player, b.player, true));
+            assertEquals(1, events.size()); assertTrue(events.getFirst().isCancelled());
+            assertTrue(parties.leave(a.core.id, party.id()));
+            f.dispatcher.accept(new io.papermc.paper.event.player.PrePlayerAttackEntityEvent(a.player, b.player, true));
+            assertEquals(2, events.size()); assertFalse(events.getLast().isCancelled());
+            f.dispatcher.accept(new io.papermc.paper.event.player.PrePlayerAttackEntityEvent(a.player, b.player, true));
+            assertEquals(2, events.size(), "The accepted second hit starts cadence; the cancelled first hit did not");
+        }
+    }
+
+    @Test void packagedBasicStickInputDealsOneLowStrengthHitWithoutVanillaContinuation() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player); f.activate(a);
+            a.core.inventory.getInventory().setSelectedSlot(1);
+            var target = mock(org.bukkit.entity.LivingEntity.class);
+            var attack = new io.papermc.paper.event.player.PrePlayerAttackEntityEvent(a.player, target, true);
+            f.dispatcher.accept(attack);
+            assertTrue(attack.isCancelled(), "The icon stick must never continue into vanilla damage");
+            verify(target).damage(1.0, a.player);
+            a.core.inventory.setItemInOffHand(null); f.changed(a); f.awaitCharacterAndReceipt(a);
+            assertEquals(org.bukkit.Material.DIAMOND_SWORD, a.core.inventory.getItem(0).getType());
+            assertTrue(a.core.inventory.getItem(1) == null || a.core.inventory.getItem(1).isEmpty(),
+                "Exit restores the ordinary item that occupied the basic-stick slot");
+        }
+    }
+
+    private static final class MutableClock extends Clock {
+        private Instant now;
+        MutableClock(Instant now) { this.now = now; }
+        void advance(java.time.Duration duration) { now = now.plus(duration); }
+        @Override public ZoneId getZone() { return ZoneOffset.UTC; }
+        @Override public Clock withZone(ZoneId zone) { return this; }
+        @Override public Instant instant() { return now; }
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/CharacterAnvilNamesNativeTest.java

@@ -0,0 +1,273 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import games.dmg.fantasystick.crafting.CharacterAnvilNames;
+import games.dmg.fantasystick.crafting.CharacterFactory;
+import games.dmg.fantasystick.items.CharacterSheets;
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import games.dmg.fantasystick.persistence.YamlCharacterRepository;
+import games.dmg.fantasystick.progression.ProgressionRules;
+import java.nio.file.Path;
+import java.time.Clock;
+import java.util.concurrent.CopyOnWriteArrayList;
+import net.kyori.adventure.text.Component;
+import net.minecraft.world.SimpleContainer;
+import net.minecraft.world.inventory.ResultContainer;
+import org.bukkit.craftbukkit.inventory.CraftAbstractInventoryView;
+import org.bukkit.craftbukkit.inventory.CraftInventoryAnvil;
+import org.bukkit.entity.HumanEntity;
+import org.bukkit.event.inventory.InventoryType;
+import org.bukkit.inventory.InventoryView;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.MenuType;
+import org.bukkit.inventory.PlayerInventory;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+import org.purpurmc.purpur.event.inventory.AnvilTakeResultEvent;
+
+class CharacterAnvilNamesNativeTest {
+    @TempDir Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test
+    void onlyAcknowledgedCopyRenameRefreshesAnActiveOtherHolderAndLateCallbacksCannotReplay() throws Exception {
+        var original = new CharacterFactory().create(ProgressionRules.defaults());
+        var anvil = new AnvilFixture();
+        var sheet = new CharacterSheets().create(original); anvil.grid.setItem(0, sheet);
+        var problems = new CopyOnWriteArrayList<CharacterAnvilNames.Failure>();
+        var tasks = new java.util.concurrent.LinkedBlockingQueue<Runnable>();
+        var output = new CharacterPresentationNativeTest.Output();
+        var holder = java.util.UUID.randomUUID(); var session = java.util.UUID.randomUUID();
+        var player = FantasyStickLifecycleNativeTest.port(org.bukkit.entity.Player.class, (name, args) -> holder);
+        var main = Thread.currentThread();
+        var presentation = new games.dmg.fantasystick.presentation.CharacterPresentation(output, tasks::add,
+            () -> Thread.currentThread() == main, failure -> { throw new AssertionError(failure); });
+        presentation.activate(player, session, original);
+        try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+            storage.create(original).join();
+            var listener = new CharacterAnvilNames(storage, problems::add,
+                org.bukkit.craftbukkit.inventory.CraftItemFactory.instance(), presentation::acknowledged);
+            var renamed = named(sheet, Component.text("Copy's <red>saved name 雪 🐉"));
+            listener.onTaken(new AnvilTakeResultEvent(anvil.actor.player, anvil.view, renamed));
+            var saved = storage.find(original.id()).join().orElseThrow();
+            assertEquals(original.name(), presentation.name(holder), "Worker may not perform native output");
+            var callback = tasks.poll(5, java.util.concurrent.TimeUnit.SECONDS); assertNotNull(callback); callback.run();
+            assertEquals(saved.name(), presentation.name(holder)); assertEquals(1, output.renamed.size());
+            assertNotEquals(holder, anvil.actor.id, "An inactive physical copy may rename another holder's active character");
+            try (var channel = java.nio.channels.FileChannel.open(data.resolve("characters/.records.lock"), java.nio.file.StandardOpenOption.WRITE);
+                 var lock = channel.lock()) {
+                assertTrue(lock.isValid());
+                listener.onTaken(new AnvilTakeResultEvent(anvil.actor.player, anvil.view, named(sheet, Component.text("failed"))));
+                assertEquals(saved, storage.find(original.id()).join().orElseThrow());
+                assertEquals(1, problems.size()); assertTrue(tasks.isEmpty());
+                assertEquals(saved.name(), presentation.name(holder));
+            }
+            listener.onTaken(new AnvilTakeResultEvent(anvil.actor.player, anvil.view, named(sheet, Component.text("late"))));
+            storage.find(original.id()).join();
+            callback = tasks.poll(5, java.util.concurrent.TimeUnit.SECONDS); assertNotNull(callback);
+            presentation.withdraw(holder, session); presentation.close(); callback.run();
+            assertNull(presentation.name(holder)); assertEquals(1, output.renamed.size());
+        }
+    }
+
+    @Test
+    void anAcceptedNativeResultSavesItsNewNameWithoutTouchingInventoryOrPlayerXp() throws Exception {
+        var original = new CharacterFactory().create(ProgressionRules.defaults());
+        var fixture = new AnvilFixture();
+        var sheet = new CharacterSheets().create(original);
+        fixture.grid.setItem(0, sheet);
+        var renamed = sheet.clone();
+        var meta = renamed.getItemMeta();
+        meta.customName(Component.text("Mira of Dawn — 雪"));
+        renamed.setItemMeta(meta);
+        fixture.grid.setItem(2, renamed);
+        var problems = new CopyOnWriteArrayList<CharacterAnvilNames.Failure>();
+        try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+            storage.create(original).join();
+            listener(storage, problems).onTaken(new AnvilTakeResultEvent(fixture.actor.player, fixture.view, renamed));
+            var saved = storage.find(original.id()).join().orElseThrow();
+            assertEquals("Mira of Dawn — 雪", saved.name());
+            assertEquals(original.id(), saved.id());
+            assertEquals(original.stats(), saved.stats());
+            assertEquals(original.health(), saved.health());
+            assertEquals(original.unspentPoints(), saved.unspentPoints());
+            assertEquals(sheet, fixture.grid.getItem(0));
+            assertEquals(renamed, fixture.grid.getItem(2));
+            var dead = storage.recordDeath(saved.id(), saved.revision()).join().orElseThrow();
+            var tail = new games.dmg.fantasystick.items.TailBooks().create(dead);
+            var book = (org.bukkit.inventory.meta.BookMeta) ItemStack.deserializeBytes(tail.serializeAsBytes()).getItemMeta();
+            assertEquals("Tail of Mira of Dawn — 雪", book.getTitle());
+            var text = net.kyori.adventure.text.serializer.plain.PlainTextComponentSerializer.plainText();
+            assertTrue(text.serialize(book.customName()).contains("Mira of Dawn — 雪"));
+            assertTrue(book.pages().stream().map(text::serialize).collect(java.util.stream.Collectors.joining())
+                .replace("\n", "").contains("Mira of Dawn — 雪"), "Readable wrapping must retain the full acknowledged name");
+            assertTrue(problems.isEmpty());
+            // Actor rejects all XP/cursor/inventory mutation calls and all worker-side player access.
+        }
+    }
+
+    @Test
+    void clearingTheCustomNameUsesTheNativePaperNameAndLaterSheetsAndTailBooksUseTheSavedName() throws Exception {
+        var original = new CharacterFactory().create(ProgressionRules.defaults());
+        var fixture = new AnvilFixture();
+        var sheet = new CharacterSheets().create(original);
+        fixture.grid.setItem(0, sheet);
+        var cleared = named(sheet, null);
+        var problems = new CopyOnWriteArrayList<CharacterAnvilNames.Failure>();
+        try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+            storage.create(original).join();
+            listener(storage, problems).onTaken(new AnvilTakeResultEvent(fixture.actor.player, fixture.view, cleared));
+            var saved = storage.find(original.id()).join().orElseThrow();
+            assertEquals("Paper", saved.name());
+            var rendered = new CharacterSheets().create(saved);
+            assertEquals(Component.text("Paper"), rendered.getItemMeta().customName());
+            assertEquals(original.id(), new CharacterSheets().identify(ItemStack.deserializeBytes(rendered.serializeAsBytes())).orElseThrow());
+            var dead = storage.recordDeath(saved.id(), saved.revision()).join().orElseThrow();
+            var book = new games.dmg.fantasystick.items.TailBooks().create(dead);
+            assertEquals("Tail of Paper", ((org.bukkit.inventory.meta.BookMeta) book.getItemMeta()).getTitle());
+            assertTrue(problems.isEmpty());
+        }
+    }
+
+    @Test
+    void ignoresOrdinaryItemsIdentitySubstitutionAndNonRenameTakesWithoutOverwritingANewerSavedName() throws Exception {
+        var original = new CharacterFactory().create(ProgressionRules.defaults());
+        var other = new CharacterFactory().create(ProgressionRules.defaults());
+        var fixture = new AnvilFixture();
+        var sheet = new CharacterSheets().create(original);
+        var problems = new CopyOnWriteArrayList<CharacterAnvilNames.Failure>();
+        try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+            storage.create(original).join();
+            storage.create(other).join();
+            var latest = storage.renameCharacter(original.id(), "Saved elsewhere").join().orElseThrow();
+            var listener = listener(storage, problems);
+            fixture.grid.setItem(0, sheet);
+            listener.onTaken(new AnvilTakeResultEvent(fixture.actor.player, fixture.view, sheet.clone()));
+            listener.onTaken(new AnvilTakeResultEvent(fixture.actor.player, fixture.view, new ItemStack(org.bukkit.Material.PAPER)));
+            listener.onTaken(new AnvilTakeResultEvent(fixture.actor.player, fixture.view,
+                named(new CharacterSheets().create(other), Component.text("Different identity"))));
+            fixture.grid.setItem(0, new ItemStack(org.bukkit.Material.PAPER));
+            listener.onTaken(new AnvilTakeResultEvent(fixture.actor.player, fixture.view, named(sheet, Component.text("Counterfeit input"))));
+            assertEquals(latest, storage.find(original.id()).join().orElseThrow());
+            assertEquals(other, storage.find(other.id()).join().orElseThrow());
+            assertTrue(problems.isEmpty());
+        }
+    }
+
+    @Test
+    void missingAndDeadSheetReferencesAreReportedWithoutCreatingOrRevivingACharacter() throws Exception {
+        for (boolean dead : new boolean[] {false, true}) {
+            var original = new CharacterFactory().create(ProgressionRules.defaults());
+            var fixture = new AnvilFixture();
+            var sheet = new CharacterSheets().create(original);
+            fixture.grid.setItem(0, sheet);
+            var problems = new CopyOnWriteArrayList<CharacterAnvilNames.Failure>();
+            try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+                if (dead) { storage.create(original).join(); storage.recordDeath(original.id(), original.revision()).join(); }
+                listener(storage, problems).onTaken(new AnvilTakeResultEvent(fixture.actor.player, fixture.view,
+                    named(sheet, Component.text("Cannot create or restore"))));
+                var saved = storage.find(original.id()).join();
+                assertEquals(dead, saved.isPresent());
+                if (dead) { assertTrue(saved.orElseThrow().dead()); assertEquals(original.name(), saved.orElseThrow().name()); }
+                assertEquals(1, problems.size());
+                assertEquals(original.id(), problems.getFirst().character());
+                assertEquals(fixture.actor.id, problems.getFirst().player());
+                assertEquals(sheet, fixture.grid.getItem(0));
+            }
+        }
+    }
+
+    @Test
+    void saveFailureReportsCapturedIdsAndPreservesSavedProgressWithoutReissuingOrMutatingItems() throws Exception {
+        var original = new CharacterFactory().create(ProgressionRules.defaults());
+        var fixture = new AnvilFixture();
+        var sheet = new CharacterSheets().create(original);
+        var output = named(sheet, Component.text("Taken but not yet saved"));
+        fixture.grid.setItem(0, sheet);
+        fixture.grid.setItem(2, output);
+        var problems = new CopyOnWriteArrayList<CharacterAnvilNames.Failure>();
+        try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+            storage.create(original).join();
+            try (var channel = java.nio.channels.FileChannel.open(data.resolve("characters/.records.lock"), java.nio.file.StandardOpenOption.WRITE);
+                 var lock = channel.lock()) {
+                assertTrue(lock.isValid());
+                listener(storage, problems).onTaken(new AnvilTakeResultEvent(fixture.actor.player, fixture.view, output));
+                assertEquals(original, storage.find(original.id()).join().orElseThrow());
+                assertEquals(1, problems.size());
+                assertNotNull(problems.getFirst().cause());
+            }
+            assertEquals(sheet, fixture.grid.getItem(0));
+            assertEquals(output, fixture.grid.getItem(2));
+            assertEquals(0, fixture.actor.syncs);
+        }
+    }
+
+    @Test
+    void capturesTheTakenNameBeforeWorkerWorkAndRepeatsDoNotRewriteTheSameSavedName() throws Exception {
+        var original = new CharacterFactory().create(ProgressionRules.defaults());
+        var fixture = new AnvilFixture();
+        var sheet = new CharacterSheets().create(original);
+        fixture.grid.setItem(0, sheet);
+        var output = named(sheet, Component.text("Captured name"));
+        var problems = new CopyOnWriteArrayList<CharacterAnvilNames.Failure>();
+        try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+            storage.create(original).join();
+            var listener = listener(storage, problems);
+            var event = new AnvilTakeResultEvent(fixture.actor.player, fixture.view, output);
+            listener.onTaken(event); listener.onTaken(event);
+            var meta = output.getItemMeta(); meta.customName(Component.text("Later mutable output")); output.setItemMeta(meta);
+            var saved = storage.find(original.id()).join().orElseThrow();
+            assertEquals("Captured name", saved.name());
+            assertEquals(java.math.BigInteger.ONE, saved.revision());
+            assertTrue(problems.isEmpty());
+        }
+    }
+
+    @Test
+    void clearingACustomNameRespectsAnExplicitNativeItemNameComponent() throws Exception {
+        var original = new CharacterFactory().create(ProgressionRules.defaults());
+        var fixture = new AnvilFixture();
+        var input = new CharacterSheets().create(original);
+        var meta = input.getItemMeta(); meta.itemName(Component.text("Arcane Paper")); input.setItemMeta(meta);
+        fixture.grid.setItem(0, input);
+        var output = named(input, null);
+        String nativeName = org.bukkit.craftbukkit.inventory.CraftItemStack.asNMSCopy(output).getHoverName().getString();
+        assertEquals("Arcane Paper", nativeName);
+        var problems = new CopyOnWriteArrayList<CharacterAnvilNames.Failure>();
+        try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+            storage.create(original).join();
+            listener(storage, problems).onTaken(new AnvilTakeResultEvent(fixture.actor.player, fixture.view, output));
+            assertEquals(nativeName, storage.find(original.id()).join().orElseThrow().name());
+            assertTrue(problems.isEmpty());
+        }
+    }
+
+    private static CharacterAnvilNames listener(CharacterStorage storage, CopyOnWriteArrayList<CharacterAnvilNames.Failure> problems) {
+        return new CharacterAnvilNames(storage, problems::add, org.bukkit.craftbukkit.inventory.CraftItemFactory.instance());
+    }
+
+    static ItemStack named(ItemStack source, Component name) {
+        var result = source.clone();
+        var meta = result.getItemMeta(); meta.customName(name); result.setItemMeta(meta);
+        return result;
+    }
+
+    static final class AnvilFixture {
+        final ManualCraftingControllerNativeTest.Actor actor = new ManualCraftingControllerNativeTest.Actor(2, 1);
+        final CraftInventoryAnvil grid = new CraftInventoryAnvil(null, new SimpleContainer(2), new ResultContainer());
+        final InventoryView view = new CraftAbstractInventoryView() {
+            @Override public CraftInventoryAnvil getTopInventory() { return grid; }
+            @Override public PlayerInventory getBottomInventory() { return actor.fixture.inventory; }
+            @Override public HumanEntity getPlayer() { return actor.player; }
+            @Override public InventoryType getType() { return InventoryType.ANVIL; }
+            @Override public String getTitle() { return "Anvil fixture"; }
+            @Override public String getOriginalTitle() { return getTitle(); }
+            @Override public void setTitle(String title) { throw new AssertionError("Unexpected title change"); }
+            @Override public MenuType getMenuType() { return null; }
+            @Override public ItemStack getCursor() { throw new AssertionError("Unexpected cursor access"); }
+            @Override public void setCursor(ItemStack item) { throw new AssertionError("Unexpected cursor write"); }
+        };
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/CharacterBookNativeTest.java

@@ -0,0 +1,348 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.UUID;
+import java.util.concurrent.TimeUnit;
+import org.bukkit.event.block.Action;
+import org.bukkit.block.BlockFace;
+import org.bukkit.event.Event;
+import org.bukkit.event.player.PlayerInteractEvent;
+import org.bukkit.inventory.EquipmentSlot;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+/** Actual packaged input/book assembly with native pages/items and explicit client/scheduler ports. */
+class CharacterBookNativeTest {
+    @TempDir Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test void queuedInspectionCannotOpenForAMovedSheetChangedSlotQuitOrDisabledLifetime() throws Exception {
+        for (int route = 0; route < 4; route++) try (var f = new FantasyStickLifecycleNativeTest.Fixture(data.resolve("route-" + route))) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data.resolve("route-" + route));
+            f.players.put(a.core.id, a.player); f.activate(a);
+            click(f, a); drainReads(f);
+            assertEquals(1, f.tasks.size());
+            switch (route) {
+                case 0 -> { a.core.inventory.setItemInOffHand(null); f.changed(a); }
+                case 1 -> a.core.inventory.getInventory().setSelectedSlot(1);
+                case 2 -> { a.core.online = false; f.dispatcher.accept(new org.bukkit.event.player.PlayerQuitEvent(a.player, net.kyori.adventure.text.Component.empty())); }
+                case 3 -> { f.plugin.setEnabled(false); f.awaitWorkers(); }
+                default -> throw new AssertionError(route);
+            }
+            runQueued(f);
+            assertTrue(a.books.isEmpty(), "Stale book callback opened a UI on route " + route);
+        }
+    }
+
+    @Test void latestRequestWinsAndReloadsNamesWithoutRetainingAnOlderRead() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player); f.activate(a);
+            click(f, a); drainReads(f);
+            var characters = characters(f);
+            characters.renameCharacter(a.core.record.id(), "Latest book name").get(5, TimeUnit.SECONDS);
+            click(f, a); drainReads(f); runQueued(f);
+            assertEquals(1, a.books.size());
+            assertTrue(text(a.books.getFirst()).contains("Latest book name"));
+        }
+    }
+
+    @Test void cappedProgressAndSavedAbilitiesRenderWithoutCappingStatsOrRewritingProgress() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player); f.activate(a);
+            var old = a.core.record;
+            var stats = new java.util.EnumMap<games.dmg.fantasystick.progression.Stat, java.math.BigInteger>(games.dmg.fantasystick.progression.Stat.class);
+            stats.putAll(old.stats());
+            var strength = new java.math.BigInteger("123456789012345678901234567890");
+            stats.put(games.dmg.fantasystick.progression.Stat.STR, strength);
+            var saved = new games.dmg.fantasystick.persistence.CharacterRecord(old.id(), old.name(), old.revision().add(java.math.BigInteger.ONE),
+                stats, 30, java.math.BigInteger.valueOf(2900), java.math.BigInteger.valueOf(9), old.health(),
+                java.util.Set.of("revive", "unavailable_saved_id"), old.loadout(), java.util.Map.of(), false, null, null);
+            new games.dmg.fantasystick.persistence.YamlCharacterRepository(data).replace(saved, old.revision());
+            click(f, a); drainReads(f); runQueued(f);
+            assertEquals(1, a.books.size());
+            String rendered = text(a.books.getFirst()).replace("\n", "");
+            for (String expected : java.util.List.of("Level: 30", "XP: MAX", "Unspent points: 9", "STR: " + strength,
+                    "revive", "unavailable_saved_id")) assertTrue(rendered.contains(expected), expected);
+            assertEquals(saved, characters(f).find(old.id()).get(5, TimeUnit.SECONDS).orElseThrow());
+        }
+    }
+
+    @Test void bookPurchasePersistsConAndPointsAndAppliesTheAcknowledgedNativeHealthGain() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player); f.activate(a);
+            a.player.setHealth(5);
+            PartyBookNativeTest.open(f, a);
+            var purchase = PartyBookNativeTest.button(a, "[+1 CON]");
+            PartyBookNativeTest.click(f, a, purchase);
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var saved = characters(f).find(a.core.record.id()).get(5, TimeUnit.SECONDS).orElseThrow();
+            assertEquals(java.math.BigInteger.ONE, saved.stats().get(games.dmg.fantasystick.progression.Stat.CON));
+            assertEquals(java.math.BigInteger.valueOf(39), saved.unspentPoints());
+            assertEquals(0, saved.health().compareTo(java.math.BigDecimal.valueOf(6)));
+            assertEquals(11, a.maximumHealth.getValue());
+            assertEquals(6, a.player.getHealth());
+            assertTrue(PartyBookNativeTest.text(a).contains("CON: 1"));
+            assertTrue(PartyBookNativeTest.text(a).contains("Unspent points: 39"));
+            PartyBookNativeTest.click(f, a, purchase);
+            PartyBookNativeTest.drain(f);
+            assertEquals(saved, characters(f).find(a.core.record.id()).get(5, TimeUnit.SECONDS).orElseThrow(),
+                "A rendered purchase action is single-use");
+        }
+    }
+
+    @Test void conPurchaseKeepsItsOwnMaximumAndOneTimeGainDespiteExternalModifiers() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player);
+            var before = new net.minecraft.world.entity.ai.attributes.AttributeModifier(
+                net.minecraft.resources.Identifier.fromNamespaceAndPath("test", "before_purchase"), 5,
+                net.minecraft.world.entity.ai.attributes.AttributeModifier.Operation.ADD_VALUE);
+            a.maximumHealth.addTransientModifier(before);
+            f.activate(a); assertEquals(10, a.maximumHealth.getValue());
+            var during = new net.minecraft.world.entity.ai.attributes.AttributeModifier(
+                net.minecraft.resources.Identifier.fromNamespaceAndPath("test", "during_purchase"), 100,
+                net.minecraft.world.entity.ai.attributes.AttributeModifier.Operation.ADD_VALUE);
+            a.maximumHealth.addPermanentModifier(during);
+            assertEquals(10, a.maximumHealth.getValue());
+            a.player.setHealth(5);
+            PartyBookNativeTest.open(f, a);
+            PartyBookNativeTest.click(f, a, PartyBookNativeTest.button(a, "[+1 CON]"));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            assertEquals(11, a.maximumHealth.getValue()); assertEquals(6, a.player.getHealth());
+            assertEquals(java.util.Set.of(before, during), a.maximumHealth.getModifiers());
+            a.core.inventory.setItemInOffHand(null); f.changed(a); f.awaitCharacterAndReceipt(a);
+            assertEquals(java.util.Set.of(before, during), a.maximumHealth.getModifiers());
+            var saved = characters(f).find(a.core.record.id()).get(5, TimeUnit.SECONDS).orElseThrow();
+            assertEquals(java.math.BigInteger.ONE, saved.stats().get(games.dmg.fantasystick.progression.Stat.CON));
+            assertEquals(0, saved.health().compareTo(java.math.BigDecimal.valueOf(6)));
+        }
+    }
+
+    @Test void failedPurchaseChangesNothingAndAcknowledgedStatsSurviveReopenTransferAndReload() throws Exception {
+        java.nio.file.Files.writeString(data.resolve("config.yml"), "character-swap-cooldown-seconds: 0\n");
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            var b = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player); f.players.put(b.core.id, b.player); f.activate(a);
+            a.player.setHealth(5);
+            PartyBookNativeTest.open(f, a);
+            var rejected = PartyBookNativeTest.button(a, "[+1 STR]");
+            var before = characters(f).find(a.core.record.id()).get(5, TimeUnit.SECONDS).orElseThrow();
+            try (var channel = java.nio.channels.FileChannel.open(data.resolve("characters/.records.lock"), java.nio.file.StandardOpenOption.WRITE);
+                 var lock = channel.lock()) {
+                assertTrue(lock.isValid());
+                PartyBookNativeTest.click(f, a, rejected);
+                PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            }
+            assertEquals(before, characters(f).find(a.core.record.id()).get(5, TimeUnit.SECONDS).orElseThrow());
+            assertEquals(5, a.player.getHealth()); assertEquals(10, a.maximumHealth.getValue());
+            assertTrue(a.messages.stream().anyMatch(message -> message.contains("could not be saved")));
+            PartyBookNativeTest.click(f, a, rejected); PartyBookNativeTest.drain(f);
+            assertEquals(before, characters(f).find(a.core.record.id()).get(5, TimeUnit.SECONDS).orElseThrow());
+
+            PartyBookNativeTest.open(f, a);
+            PartyBookNativeTest.click(f, a, PartyBookNativeTest.button(a, "[+1 STR]"));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var saved = characters(f).find(a.core.record.id()).get(5, TimeUnit.SECONDS).orElseThrow();
+            assertEquals(java.math.BigInteger.ONE, saved.stats().get(games.dmg.fantasystick.progression.Stat.STR));
+            assertEquals(java.math.BigInteger.valueOf(39), saved.unspentPoints());
+            var sheet = a.core.inventory.getItemInOffHand().clone();
+            a.core.inventory.setItemInOffHand(null); f.changed(a); f.awaitCharacterAndReceipt(a);
+            b.core.inventory.setItemInOffHand(sheet); f.activate(b);
+            PartyBookNativeTest.open(f, b);
+            assertTrue(PartyBookNativeTest.text(b).contains("STR: 1"));
+            assertTrue(PartyBookNativeTest.text(b).contains("Unspent points: 39"));
+            f.plugin.setEnabled(false); f.awaitWorkers();
+            f.players.clear(); f.plugin.setEnabled(true); f.players.put(b.core.id, b.player); f.reenter(b);
+            PartyBookNativeTest.open(f, b);
+            assertTrue(PartyBookNativeTest.text(b).contains("STR: 1"));
+            assertEquals(saved.stats(), characters(f).find(saved.id()).get(5, TimeUnit.SECONDS).orElseThrow().stats());
+        }
+    }
+
+    @Test void nativePagesKeepLargeNumbersUnicodeNamesAndUnknownAbilitiesReadableAndComplete() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player); f.activate(a);
+            var old = a.core.record;
+            var stats = new java.util.EnumMap<games.dmg.fantasystick.progression.Stat, java.math.BigInteger>(games.dmg.fantasystick.progression.Stat.class);
+            stats.putAll(old.stats());
+            String digits = "1234567890".repeat(400);
+            stats.put(games.dmg.fantasystick.progression.Stat.STR, new java.math.BigInteger(digits));
+            String name = "雪🐈".repeat(80);
+            var learned = java.util.stream.IntStream.range(0, 50).mapToObj(i -> "unknown_ability_" + i).collect(java.util.stream.Collectors.toSet());
+            var saved = new games.dmg.fantasystick.persistence.CharacterRecord(old.id(), name, old.revision().add(java.math.BigInteger.ONE),
+                stats, old.level(), old.experience(), old.unspentPoints(), old.health(), learned, old.loadout(), old.cooldowns(), false, null, null);
+            new games.dmg.fantasystick.persistence.YamlCharacterRepository(data).replace(saved, old.revision());
+            var before = a.core.snapshot();
+            click(f, a); drainReads(f); runQueued(f);
+            var content = org.bukkit.craftbukkit.inventory.CraftItemStack.asNMSCopy(a.books.getLast())
+                .get(net.minecraft.core.component.DataComponents.WRITTEN_BOOK_CONTENT);
+            assertNotNull(content);
+            for (var page : content.pages()) {
+                String text = page.raw().getString();
+                assertTrue(text.split("\\n", -1).length <= 13, "Native page exceeds visible line count");
+                for (String line : text.split("\\n", -1)) assertTrue(line.codePoints().map(cp -> cp < 128 ? 6 : 9).sum() <= 108,
+                    "Native line exceeds conservative visible width: " + line.length());
+            }
+            String complete = text(a.books.getLast()).replace("\n", "");
+            assertTrue(complete.contains(name)); assertTrue(complete.contains(digits));
+            for (String ability : learned) assertTrue(complete.contains(ability), ability);
+            assertArrayEquals(before, a.core.snapshot());
+            assertEquals(saved, characters(f).find(saved.id()).get(5, TimeUnit.SECONDS).orElseThrow());
+        }
+    }
+
+    @Test void largeRecordsRemainCompleteThroughBoundedSingleUseNavigation() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player); f.activate(a);
+            String digits = "1234567890".repeat(4000);
+            var old = a.core.record;
+            var stats = new java.util.EnumMap<games.dmg.fantasystick.progression.Stat, java.math.BigInteger>(games.dmg.fantasystick.progression.Stat.class);
+            stats.putAll(old.stats()); stats.put(games.dmg.fantasystick.progression.Stat.STR, new java.math.BigInteger(digits));
+            var saved = new games.dmg.fantasystick.persistence.CharacterRecord(old.id(), old.name(), old.revision().add(java.math.BigInteger.ONE),
+                stats, old.level(), old.experience(), old.unspentPoints(), old.health(), old.learned(), old.loadout(), old.cooldowns(), false, null, null);
+            new games.dmg.fantasystick.persistence.YamlCharacterRepository(data).replace(saved, old.revision());
+            byte[] bytes = Files.readAllBytes(data.resolve("characters").resolve(saved.id() + ".yml"));
+            click(f, a); drainReads(f); runQueued(f);
+            assertEquals(1, a.books.size(), "Large but supported records still open a native book");
+            StringBuilder all = new StringBuilder();
+            int volumes = 0;
+            while (true) {
+                var content = org.bukkit.craftbukkit.inventory.CraftItemStack.asNMSCopy(a.books.getLast())
+                    .get(net.minecraft.core.component.DataComponents.WRITTEN_BOOK_CONTENT);
+                assertNotNull(content); assertTrue(content.pages().size() <= 100, "Keep the chosen per-view payload bound (not a signed-book codec page limit)");
+                for (var page : content.pages()) if (!hasClick(page.raw())) all.append(page.raw().getString().replace("\n", ""));
+                if (!text(a.books.getLast()).contains("[Next pages]")) break;
+                assertTrue(++volumes < 10, "Navigation must terminate, not repeat a truncated volume");
+                var next = PartyBookNativeTest.button(a, "[Next pages]");
+                if (volumes == 1) {
+                    var stranger = new FantasyStickLifecycleNativeTest.Actor(data);
+                    PartyBookNativeTest.click(f, stranger, next);
+                    for (var payload : java.util.List.of(net.minecraft.nbt.StringTag.valueOf("x".repeat(1000)),
+                            net.minecraft.nbt.StringTag.valueOf("not-a-token"), new net.minecraft.nbt.CompoundTag())) {
+                        PartyBookNativeTest.click(f, a, new net.minecraft.network.chat.ClickEvent.Custom(next.id(), java.util.Optional.of(payload)));
+                    }
+                    assertTrue(stranger.books.isEmpty());
+                }
+                PartyBookNativeTest.click(f, a, next); PartyBookNativeTest.click(f, a, next);
+                drainReads(f); runQueued(f);
+                assertEquals(volumes + 1, a.books.size(), "One native action cannot open two volumes");
+            }
+            assertTrue(volumes > 0); assertTrue(all.toString().contains(digits), "Every digit remains reachable in order");
+            var previous = PartyBookNativeTest.button(a, "[Previous pages]");
+            a.core.inventory.getInventory().setSelectedSlot(1);
+            PartyBookNativeTest.click(f, a, previous); drainReads(f); runQueued(f);
+            assertEquals(volumes + 1, a.books.size(), "Stale held-slot navigation has no authority");
+            assertArrayEquals(bytes, Files.readAllBytes(data.resolve("characters").resolve(saved.id() + ".yml")));
+        }
+    }
+
+    @Test void acknowledgedRenameTransferAndReloadInspectTheCurrentRecordWithoutCarryingTheFormerHoldersView() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            var b = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player); f.players.put(b.core.id, b.player); f.activate(a);
+            click(f, a); drainReads(f); // Old holder has a queued result, not a delivered book.
+            a.core.inventory.setItemInOffHand(null); f.changed(a);
+            f.awaitCharacterAndReceipt(a);
+            var renamed = characters(f).renameCharacter(a.core.record.id(), "Traded 雪 character").get(5, TimeUnit.SECONDS).orElseThrow();
+            runQueued(f); assertTrue(a.books.isEmpty());
+            b.core.inventory.setItemInOffHand(new games.dmg.fantasystick.items.CharacterSheets().create(renamed));
+            f.activate(b); click(f, b); drainReads(f); runQueued(f);
+            assertTrue(text(b.books.getLast()).replace("\n", "").contains(renamed.name()));
+            assertTrue(a.books.isEmpty());
+            f.plugin.setEnabled(false); f.awaitWorkers();
+            f.players.clear(); f.plugin.setEnabled(true);
+            f.players.put(b.core.id, b.player); f.reenter(b);
+            var before = b.core.snapshot();
+            var path = data.resolve("characters").resolve(renamed.id() + ".yml");
+            byte[] saved = Files.readAllBytes(path);
+            click(f, b); drainReads(f); runQueued(f);
+            assertTrue(text(b.books.getLast()).replace("\n", "").contains(renamed.name()));
+            var meta = (org.bukkit.inventory.meta.BookMeta) b.books.getLast().getItemMeta();
+            assertEquals("Character", meta.getTitle()); assertEquals("Fantasy Stick", meta.getAuthor());
+            assertArrayEquals(saved, Files.readAllBytes(path)); assertArrayEquals(before, b.core.snapshot());
+        }
+    }
+
+    private static boolean hasClick(net.minecraft.network.chat.Component component) {
+        return component.getStyle().getClickEvent() != null || component.getSiblings().stream().anyMatch(CharacterBookNativeTest::hasClick);
+    }
+
+    @Test void malformedRecordReadLeavesDataAndInventoryUntouchedAndCanBeRetriedAfterRepair() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player); f.activate(a);
+            var path = data.resolve("characters").resolve(a.core.record.id() + ".yml");
+            byte[] valid = Files.readAllBytes(path);
+            byte[] invalid = "schema-version: malformed\n".getBytes(java.nio.charset.StandardCharsets.UTF_8);
+            var before = a.core.snapshot();
+            Files.write(path, invalid); click(f, a); drainReads(f); runQueued(f);
+            assertTrue(a.books.isEmpty());
+            assertTrue(a.messages.stream().anyMatch(message -> message.contains("could not be loaded")));
+            assertArrayEquals(invalid, Files.readAllBytes(path)); assertArrayEquals(before, a.core.snapshot());
+            Files.write(path, valid); click(f, a); drainReads(f); runQueued(f);
+            assertEquals(1, a.books.size());
+            assertArrayEquals(valid, Files.readAllBytes(path)); assertArrayEquals(before, a.core.snapshot());
+        }
+    }
+
+    @Test void bookAdapterIgnoresOtherControlsAndNativeItemVetoes() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player); f.activate(a);
+            var vetoed = interaction(a); vetoed.setUseItemInHand(Event.Result.DENY); f.dispatcher.accept(vetoed);
+            a.core.inventory.getInventory().setSelectedSlot(1); click(f, a);
+            a.core.inventory.getInventory().setSelectedSlot(2); click(f, a);
+            drainReads(f); runQueued(f);
+            assertTrue(a.books.isEmpty());
+            assertTrue(a.messages.isEmpty(), "Inert controls do not manufacture book errors or mutate items");
+        }
+    }
+
+    private static String text(org.bukkit.inventory.ItemStack book) {
+        var content = org.bukkit.craftbukkit.inventory.CraftItemStack.asNMSCopy(book)
+            .get(net.minecraft.core.component.DataComponents.WRITTEN_BOOK_CONTENT);
+        assertNotNull(content);
+        return content.pages().stream().map(page -> page.raw().getString()).collect(java.util.stream.Collectors.joining("\n"));
+    }
+    private static CharacterStorage characters(FantasyStickLifecycleNativeTest.Fixture f) {
+        return (CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+    }
+    private static void drainReads(FantasyStickLifecycleNativeTest.Fixture f) throws Exception {
+        characters(f).find(UUID.randomUUID()).get(5, TimeUnit.SECONDS);
+    }
+    private static PlayerInteractEvent interaction(FantasyStickLifecycleNativeTest.Actor a) {
+        return new PlayerInteractEvent(a.player, Action.RIGHT_CLICK_AIR, a.core.inventory.getItemInMainHand(), null,
+            BlockFace.SELF, EquipmentSlot.HAND);
+    }
+    private static void click(FantasyStickLifecycleNativeTest.Fixture f, FantasyStickLifecycleNativeTest.Actor a) {
+        var event = interaction(a); f.dispatcher.accept(event);
+        assertEquals(Event.Result.DENY, event.useItemInHand());
+    }
+    private static void runQueued(FantasyStickLifecycleNativeTest.Fixture f) {
+        Runnable task;
+        while ((task = f.tasks.poll()) != null) task.run();
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/CharacterChatNamesNativeTest.java

@@ -0,0 +1,55 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+import games.dmg.fantasystick.presentation.CharacterChatNames;
+import io.papermc.paper.chat.ChatRenderer;
+import io.papermc.paper.event.player.AsyncChatEvent;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.UUID;
+import net.kyori.adventure.audience.Audience;
+import net.kyori.adventure.chat.SignedMessage;
+import net.kyori.adventure.text.Component;
+import org.bukkit.entity.Player;
+import org.junit.jupiter.api.Test;
+
+class CharacterChatNamesNativeTest {
+    @Test void nativeRendererReceivesLiteralSessionNameWithoutReplacingSignedBodyOrRecipients() {
+        UUID id = UUID.randomUUID();
+        Player player = FantasyStickLifecycleNativeTest.port(Player.class, (name, args) -> {
+            assertEquals("getUniqueId", name); return id;
+        });
+        var names = new HashMap<UUID, String>();
+        String name = "<rainbow>雪 🐉 literal name longer than sixteen";
+        names.put(id, name);
+        var listener = new CharacterChatNames(names::get);
+        var body = Component.text("original signed <body>");
+        var signed = SignedMessage.system("original signed <body>", body);
+        var viewers = new HashSet<Audience>(); viewers.add(Audience.empty());
+        ChatRenderer renderer = (sender, display, message, viewer) -> {
+            assertSame(player, sender); assertSame(body, message);
+            assertEquals(Component.text(name), display);
+            return Component.text("prefix ").append(display).append(message);
+        };
+        var event = new AsyncChatEvent(true, player, viewers, renderer, body, body, signed);
+        listener.onChat(event);
+        assertSame(body, event.message()); assertSame(body, event.originalMessage());
+        assertSame(signed, event.signedMessage()); assertEquals(viewers, event.viewers()); assertFalse(event.isCancelled());
+        // The renderer may run after a switch; this accepted event captures its immutable sender name.
+        names.put(id, "replacement");
+        assertEquals(Component.text("prefix ").append(Component.text(name)).append(body),
+            event.renderer().render(player, Component.text("account"), event.message(), Audience.empty()));
+    }
+
+    @Test void cancellationsAndOrdinaryRenderersAreUntouched() {
+        UUID id = UUID.randomUUID();
+        Player player = FantasyStickLifecycleNativeTest.port(Player.class, (name, args) -> id);
+        var listener = new CharacterChatNames(ignored -> "fantasy");
+        var body = Component.text("body"); var renderer = ChatRenderer.defaultRenderer();
+        var event = new AsyncChatEvent(true, player, new HashSet<>(), renderer, body, body, SignedMessage.system("body", body));
+        event.setCancelled(true); listener.onChat(event);
+        assertTrue(event.isCancelled()); assertSame(renderer, event.renderer());
+        event.setCancelled(false); new CharacterChatNames(ignored -> null).onChat(event);
+        assertSame(renderer, event.renderer()); assertSame(body, event.message());
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/CharacterPresentationNativeTest.java

@@ -0,0 +1,88 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+import games.dmg.fantasystick.crafting.CharacterFactory;
+import games.dmg.fantasystick.persistence.CharacterRecord;
+import games.dmg.fantasystick.presentation.CharacterPresentation;
+import games.dmg.fantasystick.progression.ProgressionRules;
+import java.util.ArrayList;
+import java.util.UUID;
+import org.bukkit.entity.Player;
+import org.junit.jupiter.api.Test;
+
+class CharacterPresentationNativeTest {
+    @Test void immutableSessionNamesWithdrawBeforeOutputFailureAndRejectOldAcknowledgments() {
+        UUID holder = UUID.randomUUID(); var first = UUID.randomUUID(); var second = UUID.randomUUID();
+        var player = FantasyStickLifecycleNativeTest.port(Player.class, (name, args) -> { assertEquals("getUniqueId", name); return holder; });
+        var record = new CharacterFactory().create(ProgressionRules.defaults());
+        var tasks = new ArrayList<Runnable>(); var failures = new ArrayList<Throwable>();
+        var output = new Output();
+        var presentation = new CharacterPresentation(output, tasks::add, () -> true, failures::add);
+        presentation.activate(player, first, record);
+        assertEquals(record.name(), presentation.name(holder));
+        assertEquals(1, output.shown.size());
+        var snapshot = presentation.snapshot();
+        var renamed = rename(record, "雪 <red>literal 🐉", 1);
+        presentation.acknowledged(renamed);
+        presentation.withdraw(holder, first);
+        presentation.activate(player, second, rename(record, "new authoritative", 2));
+        tasks.forEach(Runnable::run); tasks.clear();
+        assertEquals("new authoritative", presentation.name(holder));
+        assertEquals(record.name(), snapshot.get(holder).name());
+        presentation.withdraw(holder, first); // Old token cannot erase replacement.
+        assertEquals("new authoritative", presentation.name(holder));
+        output.failClear = true;
+        presentation.withdraw(holder, second);
+        assertNull(presentation.name(holder)); assertEquals(1, failures.size());
+        presentation.close(); presentation.acknowledged(rename(record, "late", 3));
+        tasks.forEach(Runnable::run);
+        presentation.activate(player, first, record);
+        assertTrue(presentation.snapshot().isEmpty());
+    }
+
+    @Test void activationClosesTheFreshReadToRenameAcknowledgmentRaceAndNeverAppliesAnOldReadToANewSession() {
+        UUID holder = UUID.randomUUID();
+        Player player = FantasyStickLifecycleNativeTest.port(Player.class, (name, args) -> holder);
+        var record = new CharacterFactory().create(ProgressionRules.defaults());
+        var reads = new ArrayList<java.util.concurrent.CompletableFuture<java.util.Optional<CharacterRecord>>>();
+        var tasks = new ArrayList<Runnable>(); var output = new Output();
+        var presentation = new CharacterPresentation(output, tasks::add, () -> true, failure -> { throw new AssertionError(failure); }, id -> {
+            assertEquals(record.id(), id);
+            var read = new java.util.concurrent.CompletableFuture<java.util.Optional<CharacterRecord>>(); reads.add(read); return read;
+        });
+        // Rename committed after EquipmentSessions' final load but before presentation activation.
+        presentation.acknowledged(rename(record, "already saved while not active", 1));
+        UUID session = UUID.randomUUID();
+        presentation.activate(player, session, record);
+        assertEquals(1, reads.size(), "Resume always rechecks the authoritative record, not a physical-sheet/cache name");
+        reads.getFirst().complete(java.util.Optional.of(rename(record, "already saved while not active", 1)));
+        tasks.forEach(Runnable::run); tasks.clear();
+        assertEquals("already saved while not active", presentation.name(holder));
+        presentation.withdraw(holder, session);
+        UUID replacement = UUID.randomUUID();
+        presentation.activate(player, replacement, record);
+        reads.get(1).complete(java.util.Optional.of(rename(record, "old queued name", 2)));
+        presentation.withdraw(holder, replacement);
+        presentation.activate(player, UUID.randomUUID(), rename(record, "fresh current name", 3));
+        tasks.forEach(Runnable::run); tasks.clear();
+        assertEquals("fresh current name", presentation.name(holder));
+        reads.get(2).complete(java.util.Optional.of(rename(record, "fresh current name", 3)));
+        assertTrue(tasks.isEmpty(), "Equal revision does not enqueue redundant native output");
+        presentation.close();
+    }
+
+    static CharacterRecord rename(CharacterRecord r, String name, int revision) {
+        return new CharacterRecord(r.id(), name, java.math.BigInteger.valueOf(revision), r.stats(), r.level(), r.experience(),
+            r.unspentPoints(), r.health(), r.learned(), r.loadout(), r.cooldowns(), r.dead(), r.deathId(), r.diedAt());
+    }
+    static final class Output implements CharacterPresentation.Output {
+        final ArrayList<CharacterPresentation.View> shown = new ArrayList<>();
+        final ArrayList<CharacterPresentation.View> renamed = new ArrayList<>();
+        final ArrayList<CharacterPresentation.View> cleared = new ArrayList<>();
+        boolean failClear;
+        @Override public void show(Player player, CharacterPresentation.View view) { shown.add(view); }
+        @Override public void rename(CharacterPresentation.View view) { renamed.add(view); }
+        @Override public void clear(CharacterPresentation.View view) { cleared.add(view); if (failClear) throw new IllegalStateException("native send failed"); }
+        @Override public void close() { }
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/CharacterSheetsNativeTest.java

@@ -84,6 +84,8 @@ class CharacterSheetsNativeTest {
             assertEquals(1, preview.getAmount());
             assertTrue(sheets.identify(preview).isEmpty());
             assertTrue(preview.getItemMeta().getPersistentDataContainer().isEmpty());
+            assertEquals(List.of(Component.text("Character sheet:"), Component.text("Place in off hand"),
+                Component.text("to enter fantasy world.")), preview.getItemMeta().lore());
         }
     }
 
@@ -104,7 +106,8 @@ class CharacterSheetsNativeTest {
         assertEquals(Material.PAPER, sheet.getType());
         assertEquals(1, sheet.getAmount());
         assertEquals(Component.text(record.name()), sheet.getItemMeta().displayName());
-        assertEquals(List.of(Component.text("Character sheet: place in off hand to enter fantasy world.")), sheet.getItemMeta().lore());
+        assertEquals(List.of(Component.text("Character sheet:"), Component.text("Place in off hand"),
+            Component.text("to enter fantasy world.")), sheet.getItemMeta().lore());
         assertEquals(record.id(), sheets.identify(sheet).orElseThrow());
         assertEquals(Set.of(new NamespacedKey("fantasystick", "sheet_version"), new NamespacedKey("fantasystick", "character_id")),
             sheet.getItemMeta().getPersistentDataContainer().getKeys(), "No player owner, equipment or progress snapshot belongs on the sheet");

src/nativeTest/java/games/dmg/fantasystick/CombatExperienceNativeTest.java

@@ -0,0 +1,263 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.ArgumentMatchers.*;
+import static org.mockito.Mockito.*;
+
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.UUID;
+import org.bukkit.Location;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.entity.EntityType;
+import org.bukkit.event.entity.EntityDamageByEntityEvent;
+import org.bukkit.event.entity.EntityDamageEvent.DamageCause;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class CombatExperienceNativeTest {
+    @TempDir Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test void packagedBasicAttackToBossDeathPersistsLevelAndUpdatesBookFeedbackExactlyOnce() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            assertTrue(f.order.contains("CombatExperience"));
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player); f.activate(a);
+            var world = mock(org.bukkit.World.class); var worldId = UUID.randomUUID(); when(world.getUID()).thenReturn(worldId);
+            var target = mob(EntityType.WARDEN, new Location(world, 10, 65, -4));
+            doAnswer(call -> {
+                var source = mock(org.bukkit.damage.DamageSource.class);
+                when(source.getCausingEntity()).thenReturn(a.player);
+                when(source.getDirectEntity()).thenReturn(a.player);
+                var event = new EntityDamageByEntityEvent(a.player, target, DamageCause.ENTITY_ATTACK,
+                    source, (Double) call.getArgument(0));
+                f.dispatcher.accept(event); return null;
+            }).when(target).damage(anyDouble(), same(a.player));
+
+            a.core.inventory.getInventory().setSelectedSlot(1);
+            var attack = new io.papermc.paper.event.player.PrePlayerAttackEntityEvent(a.player, target, true);
+            f.dispatcher.accept(attack);
+            assertTrue(attack.isCancelled());
+            var source = mock(org.bukkit.damage.DamageSource.class);
+            var death = new org.bukkit.event.entity.EntityDeathEvent(target, source, new ArrayList<>(), 17);
+            f.dispatcher.accept(death);
+            PartyBookNativeTest.drain(f);
+
+            var storage = (games.dmg.fantasystick.persistence.CharacterStorage)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            var saved = storage.find(a.core.record.id()).get().orElseThrow();
+            PartyBookNativeTest.drain(f); // Deliver the post-commit main-thread acknowledgment and feedback.
+            assertEquals(java.math.BigInteger.valueOf(100), saved.experience());
+            assertEquals(2, saved.level());
+            assertEquals(java.math.BigInteger.valueOf(41), saved.unspentPoints());
+            assertEquals(17, death.getDroppedExp(), "Fantasy rewards never replace native Minecraft XP");
+            assertTrue(a.messages.stream().anyMatch(message -> message.contains("100") && message.contains("XP")));
+            assertTrue(a.messages.stream().anyMatch(message -> message.contains("Level 2")));
+            assertTrue(mockingDetails(a.world).getInvocations().stream().anyMatch(invocation ->
+                invocation.getMethod().getName().equals("spawnParticle")
+                    && java.util.Arrays.asList(invocation.getArguments()).contains(12)));
+            assertFalse(a.sounds.isEmpty());
+
+            a.core.inventory.getInventory().setSelectedSlot(0);
+            PartyBookNativeTest.open(f, a);
+            String book = PartyBookNativeTest.text(a);
+            assertTrue(book.contains("Level: 2")); assertTrue(book.contains("XP: 0/100"));
+
+            f.dispatcher.accept(new org.bukkit.event.entity.EntityDeathEvent(target, source, new ArrayList<>(), 17));
+            PartyBookNativeTest.drain(f);
+            assertEquals(saved, storage.find(a.core.record.id()).get().orElseThrow(), "One defeated target awards only once");
+        }
+    }
+
+    @Test void sharingProjectileExitPassiveExemptionAndPerCharacterRestrictedSpacingUseNativeEvents() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            var b = new FantasyStickLifecycleNativeTest.Actor(data);
+            var c = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player); f.players.put(b.core.id, b.player); f.players.put(c.core.id, c.player);
+            f.activate(a); f.activate(b); f.activate(c);
+            var world = mock(org.bukkit.World.class); when(world.getUID()).thenReturn(UUID.randomUUID());
+
+            var first = mob(EntityType.ZOMBIE, new Location(world, 0, 64, 0));
+            hit(f, a.player, first, false);
+            die(f, first); settle(f);
+            assertEquals(java.math.BigInteger.TEN, record(f, a).experience());
+            assertEquals(java.math.BigInteger.ZERO, record(f, b).experience());
+
+            var near = mob(EntityType.BEE, new Location(world, 2, 64, 0)); // Neutral, regardless of aggression.
+            hit(f, a.player, near, false);
+            var arrow = PartyCombatNativeTest.projectile(f, b.player);
+            hit(f, arrow, near, false);
+            var ordinary = PartyCombatNativeTest.entity(org.bukkit.entity.Arrow.class);
+            hit(f, ordinary, near, false); // Ordinary sources never enter the fantasy denominator.
+            PartyCombatNativeTest.exit(f, b); // The arrow's originating character still owns its accepted contribution.
+            die(f, near); settle(f);
+            assertEquals(java.math.BigInteger.TEN, record(f, a).experience(), "Blocked share is lost rather than redistributed");
+            assertEquals(java.math.BigInteger.valueOf(5), record(f, b).experience(), "First restricted kill is eligible for this character");
+
+            var passive = mob(EntityType.COW, new Location(world, 2, 64, 0));
+            hit(f, a.player, passive, false);
+            hit(f, c.player, passive, false);
+            // b is now ordinary; its direct damage cannot enter the fantasy denominator.
+            hit(f, b.player, passive, false);
+            die(f, passive); settle(f);
+            assertEquals(java.math.BigInteger.valueOf(11), record(f, a).experience());
+            assertEquals(java.math.BigInteger.valueOf(5), record(f, b).experience());
+            assertEquals(java.math.BigInteger.ONE, record(f, c).experience(),
+                "A one-XP passive pool rounds up to one for every fantasy contributor");
+
+            var exact = mob(EntityType.ZOMBIE, new Location(world, 5, 64, 0));
+            hit(f, a.player, exact, false);
+            hit(f, a.player, exact, true); // Cancelled repeats do not create another contributor.
+            die(f, exact); settle(f);
+            assertEquals(java.math.BigInteger.valueOf(21), record(f, a).experience(),
+                "Passive kill did not reset history; exact three-block distance from blocked kill is eligible");
+            assertEquals(new java.math.BigDecimal("5.0"), record(f, a).restrictedKills().values().iterator().next().x());
+
+            var repeatedPassive = mob(EntityType.SHEEP, new Location(world, 2, 64, 0));
+            hit(f, a.player, repeatedPassive, false); die(f, repeatedPassive); settle(f);
+            assertEquals(java.math.BigInteger.valueOf(22), record(f, a).experience(), "Same-location passive kills remain eligible");
+        }
+    }
+
+    @Test void failedRewardSaveRetainsOneRetryableOperationWithoutReplayingTheTarget() {
+        var storage = mock(games.dmg.fantasystick.persistence.CharacterStorage.class);
+        var sessions = mock(games.dmg.fantasystick.session.EquipmentSessions.class);
+        var progression = games.dmg.fantasystick.progression.ProgressionRules.defaults();
+        var original = new games.dmg.fantasystick.crafting.CharacterFactory().create(progression);
+        var active = new games.dmg.fantasystick.session.EquipmentSessions.Active(UUID.randomUUID(), UUID.randomUUID(), original.id());
+        var attacker = mock(org.bukkit.entity.Player.class);
+        when(attacker.getUniqueId()).thenReturn(active.player());
+        when(sessions.active(active.player())).thenReturn(java.util.Optional.of(active));
+        when(sessions.current(active)).thenReturn(true);
+        when(storage.find(original.id())).thenReturn(java.util.concurrent.CompletableFuture.completedFuture(java.util.Optional.of(original)));
+        var failed = new java.util.concurrent.CompletableFuture<games.dmg.fantasystick.persistence.CharacterStorage.CombatAward>();
+        failed.completeExceptionally(new java.io.IOException("simulated write failure"));
+        var saved = new games.dmg.fantasystick.persistence.CharacterRecord(original.id(), original.name(), java.math.BigInteger.ONE,
+            original.stats(), original.level(), java.math.BigInteger.TEN, original.unspentPoints(), original.health(),
+            original.learned(), original.loadout(), original.cooldowns(), original.restrictedKills(), false, null, null);
+        var success = java.util.concurrent.CompletableFuture.completedFuture(
+            new games.dmg.fantasystick.persistence.CharacterStorage.CombatAward(
+                games.dmg.fantasystick.persistence.CharacterStorage.CombatAwardStatus.APPLIED, java.util.Optional.of(saved), 0));
+        var writes = new java.util.concurrent.atomic.AtomicInteger();
+        when(storage.awardCombatExperience(eq(original.id()), any(), eq(java.math.BigInteger.TEN), same(progression), any(), any()))
+            .thenAnswer(ignored -> writes.getAndIncrement() == 0 ? failed : success);
+        var failures = new ArrayList<games.dmg.fantasystick.party.CombatExperience.Failure>();
+        var service = new games.dmg.fantasystick.party.CombatExperience(storage, progression,
+            games.dmg.fantasystick.progression.CombatRewardRules.defaults(), sessions,
+            java.time.Clock.fixed(java.time.Instant.parse("2026-09-19T20:00:00Z"), java.time.ZoneOffset.UTC), Runnable::run,
+            ignored -> null, failures::add);
+        var world = mock(org.bukkit.World.class); when(world.getUID()).thenReturn(UUID.randomUUID());
+        var target = mob(EntityType.ZOMBIE, new Location(world, 0, 64, 0));
+        var damageSource = mock(org.bukkit.damage.DamageSource.class);
+        when(damageSource.getDirectEntity()).thenReturn(attacker); when(damageSource.getCausingEntity()).thenReturn(attacker);
+        service.damage(new EntityDamageByEntityEvent(attacker, target, DamageCause.ENTITY_ATTACK, damageSource, 1));
+        service.mobDeath(new org.bukkit.event.entity.EntityDeathEvent(target, damageSource, new ArrayList<>(), 0));
+        verify(storage, times(1)).awardCombatExperience(eq(original.id()), any(), any(), any(), any(), any());
+        assertEquals(1, failures.size());
+        service.retryPending();
+        verify(storage, times(2)).awardCombatExperience(eq(original.id()), any(), any(), any(), any(), any());
+        service.mobDeath(new org.bukkit.event.entity.EntityDeathEvent(target, damageSource, new ArrayList<>(), 0));
+        service.retryPending();
+        verify(storage, times(2)).awardCombatExperience(eq(original.id()), any(), any(), any(), any(), any());
+        service.close();
+    }
+
+    @Test void validatedConfiguredPoolAndZeroSpacingReachTheRegisteredRewardPath() throws Exception {
+        java.nio.file.Files.writeString(data.resolve("config.yml"),
+            "xp-per-level: 10\nordinary-xp: 25\nrestricted-kill-spacing-blocks: 0\n");
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); f.players.put(a.core.id, a.player); f.activate(a);
+            var world = mock(org.bukkit.World.class); when(world.getUID()).thenReturn(UUID.randomUUID());
+            for (int index = 0; index < 2; index++) {
+                var target = mob(EntityType.ZOMBIE, new Location(world, 0, 64, 0));
+                hit(f, a.player, target, false); die(f, target); settle(f);
+            }
+            assertEquals(java.math.BigInteger.valueOf(50), record(f, a).experience());
+            assertEquals(6, record(f, a).level());
+            assertEquals(java.math.BigInteger.valueOf(45), record(f, a).unspentPoints());
+            assertEquals(5, a.sounds.size(), "Every gained level has its own feedback sound");
+            for (int level = 2; level <= 6; level++) {
+                int expected = level;
+                assertTrue(a.messages.stream().anyMatch(message -> message.contains("Level " + expected)));
+            }
+        }
+    }
+
+    @Test void interceptedFantasyDefeatUsesVictimLevelPoolAndCancelledDamageCreatesNoCredit() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            var b = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player); f.players.put(b.core.id, b.player);
+            f.activate(a); f.activate(b);
+            hit(f, a.player, b.player, true);
+            var source = mock(org.bukkit.damage.DamageSource.class);
+            var cancelled = new org.bukkit.event.entity.PlayerDeathEvent(b.player, source, new ArrayList<>(), 0,
+                net.kyori.adventure.text.Component.text("defeat"), true);
+            f.dispatcher.accept(cancelled); settle(f);
+            assertTrue(cancelled.isCancelled());
+            assertEquals(java.math.BigInteger.ZERO, record(f, a).experience(), "Cancelled damage never contributes");
+        }
+
+        var second = data.resolve("accepted"); java.nio.file.Files.createDirectories(second);
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(second)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(second);
+            var b = new FantasyStickLifecycleNativeTest.Actor(second);
+            f.players.put(a.core.id, a.player); f.players.put(b.core.id, b.player);
+            f.activate(a); f.activate(b);
+            hit(f, a.player, b.player, false);
+            var source = mock(org.bukkit.damage.DamageSource.class);
+            var defeat = new org.bukkit.event.entity.PlayerDeathEvent(b.player, source, new ArrayList<>(), 0,
+                net.kyori.adventure.text.Component.text("defeat"), true);
+            f.dispatcher.accept(defeat); settle(f); settle(f);
+            assertTrue(defeat.isCancelled());
+            assertEquals(java.math.BigInteger.TEN, record(f, a).experience(), "Level-one fantasy defeat supplies a ten-XP pool");
+            assertTrue(record(f, b).dead());
+            f.dispatcher.accept(defeat); settle(f);
+            assertEquals(java.math.BigInteger.TEN, record(f, a).experience(), "Repeated intercepted callback cannot award twice");
+        }
+    }
+
+    private static EntityDamageByEntityEvent hit(FantasyStickLifecycleNativeTest.Fixture f, org.bukkit.entity.Entity source,
+                                                   org.bukkit.entity.Entity target, boolean cancelled) {
+        var damage = mock(org.bukkit.damage.DamageSource.class);
+        when(damage.getCausingEntity()).thenReturn(source);
+        when(damage.getDirectEntity()).thenReturn(source);
+        var event = new EntityDamageByEntityEvent(source, target, DamageCause.ENTITY_ATTACK, damage, 4);
+        event.setCancelled(cancelled); f.dispatcher.accept(event); return event;
+    }
+
+    private static void die(FantasyStickLifecycleNativeTest.Fixture f, LivingEntity target) {
+        f.dispatcher.accept(new org.bukkit.event.entity.EntityDeathEvent(target,
+            mock(org.bukkit.damage.DamageSource.class), new ArrayList<>(), 0));
+    }
+
+    private static void settle(FantasyStickLifecycleNativeTest.Fixture f) throws Exception {
+        PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+    }
+
+    private static games.dmg.fantasystick.persistence.CharacterRecord record(FantasyStickLifecycleNativeTest.Fixture f,
+                                                                              FantasyStickLifecycleNativeTest.Actor actor) throws Exception {
+        var storage = (games.dmg.fantasystick.persistence.CharacterStorage)
+            FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+        return storage.find(actor.core.record.id()).get().orElseThrow();
+    }
+
+    private static LivingEntity mob(EntityType type, Location location) {
+        var entity = mock(LivingEntity.class);
+        when(entity.getUniqueId()).thenReturn(UUID.randomUUID());
+        when(entity.getType()).thenReturn(type);
+        when(entity.getLocation()).thenAnswer(ignored -> location.clone());
+        when(entity.getWorld()).thenReturn(location.getWorld());
+        when(entity.getPersistentDataContainer()).thenReturn(new org.bukkit.craftbukkit.persistence.CraftPersistentDataContainer(
+            new org.bukkit.craftbukkit.persistence.CraftPersistentDataTypeRegistry()));
+        return entity;
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/DefeatHealthDeliveryNativeTest.java

@@ -0,0 +1,86 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.ArgumentMatchers.*;
+import static org.mockito.Mockito.*;
+
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.List;
+import net.minecraft.network.protocol.Packet;
+import net.minecraft.network.protocol.game.ClientboundSetHealthPacket;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class DefeatHealthDeliveryNativeTest {
+    @TempDir Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test void zeroHealthDefeatNeverDeliversADeathScreenHealthUpdateAndTailArrivesWithoutReconnect() throws Exception {
+        for (boolean queued : List.of(false, true)) try (var f = new FantasyStickLifecycleNativeTest.Fixture(data.resolve("queued-" + queued))) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data.resolve("queued-" + queued));
+            f.players.put(a.core.id, a.player);
+            var sent = nativeHealthDelivery(a);
+            var entry = a.player.getLocation();
+            f.activate(a);
+            a.core.location.add(20, 0, 20);
+            a.core.health = 0; // The real death callback begins after native health reaches zero.
+            sent.clear();
+            a.nativePlayer.queueHealthUpdatePacket = queued;
+            var death = death(a);
+            f.dispatcher.accept(death);
+            if (a.nativePlayer.queuedHealthUpdatePacket != null) sent.add(a.nativePlayer.queuedHealthUpdatePacket);
+            a.nativePlayer.queueHealthUpdatePacket = false;
+            PartyBookNativeTest.drain(f);
+            assertTrue(death.isCancelled());
+            assertEquals(a.maximumHealth.getValue(), a.player.getHealth());
+            assertEquals(entry, a.player.getLocation());
+            assertFalse(a.player.isHealthScaled());
+            var updates = sent.stream().filter(ClientboundSetHealthPacket.class::isInstance)
+                .map(ClientboundSetHealthPacket.class::cast).toList();
+            assertFalse(updates.isEmpty(), "Exercise actual CraftPlayer scale/health delivery, not a mocked setter");
+            assertTrue(updates.stream().allMatch(p -> p.getHealth() > 0),
+                () -> "Cancelled fantasy defeat must never deliver zero health: " + updates.stream().map(ClientboundSetHealthPacket::getHealth).toList());
+            var tail = a.core.inventory.getItemInOffHand().clone();
+            assertEquals(org.bukkit.Material.WRITTEN_BOOK, tail.getType()); assertEquals(1, tail.getAmount());
+            f.dispatcher.accept(death); PartyBookNativeTest.drain(f);
+            assertEquals(tail, a.core.inventory.getItemInOffHand());
+            // A subsequent ordinary death is not protected by a blanket zero-health packet filter.
+            a.core.health = 0;
+            var ordinaryDeath = death(a); f.dispatcher.accept(ordinaryDeath);
+            assertFalse(ordinaryDeath.isCancelled());
+            a.player.sendHealthUpdate();
+            assertEquals(0, ((ClientboundSetHealthPacket) sent.getLast()).getHealth());
+        }
+    }
+
+    private static org.bukkit.event.entity.PlayerDeathEvent death(FantasyStickLifecycleNativeTest.Actor a) {
+        var source = new org.bukkit.craftbukkit.damage.CraftDamageSource(new net.minecraft.world.damagesource.DamageSource(
+            org.bukkit.craftbukkit.damage.CraftDamageType.bukkitToMinecraftHolder(org.bukkit.damage.DamageType.GENERIC)));
+        return new org.bukkit.event.entity.PlayerDeathEvent(a.player, source, new ArrayList<>(), 0,
+            net.kyori.adventure.text.Component.empty(), true);
+    }
+
+    private static List<Packet<?>> nativeHealthDelivery(FantasyStickLifecycleNativeTest.Actor a) {
+        var sent = new ArrayList<Packet<?>>();
+        var connection = mock(net.minecraft.server.network.ServerGamePacketListenerImpl.class);
+        doAnswer(call -> { sent.add(call.getArgument(0)); return null; }).when(connection).send(any(Packet.class));
+        a.nativePlayer.connection = connection;
+        when(a.nativePlayer.getFoodData()).thenReturn(a.food);
+        // Transport and tracked entity storage are explicit ports; scaling and packet creation run natively.
+        when(a.nativePlayer.getEntityData()).thenReturn(mock(net.minecraft.network.syncher.SynchedEntityData.class));
+        doCallRealMethod().when(a.player).setHealthScale(anyDouble());
+        doCallRealMethod().when(a.player).setHealthScaled(anyBoolean());
+        doCallRealMethod().when(a.player).getHealthScale();
+        doCallRealMethod().when(a.player).isHealthScaled();
+        doCallRealMethod().when(a.player).getScaledHealth();
+        doCallRealMethod().when(a.player).getScaledMaxHealth();
+        doCallRealMethod().when(a.player).updateScaledHealth();
+        doCallRealMethod().when(a.player).updateScaledHealth(anyBoolean());
+        doCallRealMethod().when(a.player).sendHealthUpdate();
+        a.player.setHealthScale(20); a.player.setHealthScaled(false);
+        sent.clear(); return sent;
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/EquipmentAdminCommandNativeTest.java

@@ -0,0 +1,208 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.UUID;
+import org.bukkit.command.CommandSender;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+/** Actual packaged PluginCommand permission/dispatch; only the absent console is a port. */
+class EquipmentAdminCommandNativeTest {
+    @TempDir Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test void adventureConfigurationCommandReadsValidatesPersistsAndReopensWithoutTouchingPlayers() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var sender = new Sender();
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "adventure-mode"});
+            assertTrue(sender.messages.getLast().contains("adventure-mode=true"));
+            sender.messages.clear();
+            for (String value : List.of("yes", "1", "TRUE", "")) {
+                f.command.execute(sender.port, "fantasystick", new String[]{"config", "adventure-mode", value});
+                assertTrue(sender.messages.getLast().contains("true|false"));
+            }
+            assertTrue(f.tasks.isEmpty());
+            assertFalse(Files.exists(data.resolve("config.yml")));
+            sender.allowed = false;
+            f.command.getExecutor().onCommand(sender.port, f.command, "fantasystick", new String[]{"config", "adventure-mode", "false"});
+            assertFalse(Files.exists(data.resolve("config.yml")));
+            sender.allowed = true; sender.messages.clear();
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "adventure-mode", "false"});
+            assertTrue(sender.messages.isEmpty(), "Do not report success before acknowledgment");
+            var reply = f.tasks.poll(5, java.util.concurrent.TimeUnit.SECONDS); assertNotNull(reply); reply.run();
+            assertTrue(sender.messages.getLast().contains("adventure-mode=false"));
+            assertTrue(sender.messages.getLast().contains("new sessions"));
+            assertEquals(0, f.playerLookups);
+            f.plugin.setEnabled(false); f.plugin.setEnabled(true);
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "adventure-mode"});
+            assertTrue(sender.messages.getLast().contains("adventure-mode=false"));
+        }
+    }
+
+    @Test void reenableWaitsOffThreadForAcceptedConfigurationWritesBeforeReadingNewPolicy() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var old = FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "adventureSettings");
+            var worker = (java.util.concurrent.ExecutorService) FantasyStickLifecycleNativeTest.Fixture.field(old, "worker");
+            var entered = new java.util.concurrent.CountDownLatch(1);
+            var release = new java.util.concurrent.CountDownLatch(1);
+            worker.execute(() -> {
+                entered.countDown();
+                try { release.await(5, java.util.concurrent.TimeUnit.SECONDS); }
+                catch (InterruptedException error) { Thread.currentThread().interrupt(); }
+            });
+            try {
+                assertTrue(entered.await(5, java.util.concurrent.TimeUnit.SECONDS));
+                var sender = new Sender();
+                f.command.execute(sender.port, "fantasystick", new String[]{"config", "adventure-mode", "false"});
+                f.plugin.setEnabled(false); f.plugin.setEnabled(true);
+                assertNull(FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "sessions"), "Do not activate from a stale config snapshot");
+                release.countDown();
+                f.tick();
+                assertNotNull(FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "sessions"));
+                f.command.execute(sender.port, "fantasystick", new String[]{"config", "adventure-mode"});
+                assertTrue(sender.messages.getLast().contains("adventure-mode=false"));
+            } finally { release.countDown(); }
+        }
+    }
+
+    @Test void permissionAndStrictShapeRejectBeforePersistenceOrNativeLookup() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            assertNotNull(f.command, "Packaged descriptor must install the actual command");
+            var sender = new Sender();
+            sender.allowed = false;
+            assertTrue(f.command.execute(sender.port, "fantasystick", new String[]{"inspect", UUID.randomUUID().toString()}));
+            // Executor must also defend direct dispatch, not rely solely on PluginCommand.
+            assertTrue(f.command.getExecutor().onCommand(sender.port, f.command, "fantasystick",
+                new String[]{"recover", UUID.randomUUID().toString()}));
+            sender.allowed = true;
+            for (String[] args : List.of(new String[]{}, new String[]{"inspect"},
+                    new String[]{"reset", UUID.randomUUID().toString()}, new String[]{"inspect", "1-1-1-1-1"},
+                    new String[]{"recover", "not-a-uuid"}, new String[]{"inspect", UUID.randomUUID().toString(), "extra"})) {
+                assertTrue(f.command.execute(sender.port, "fantasystick", args));
+            }
+            assertFalse(Files.exists(data.resolve("sessions")));
+            assertTrue(f.tasks.isEmpty());
+            assertEquals(0, f.playerLookups, "Rejected commands must not inspect native players");
+            assertFalse(sender.messages.isEmpty());
+        }
+        assertFalse(Files.exists(data.resolve("sessions")), "No queued IO after worker drain either");
+    }
+
+    @Test void inspectIsDeferredSanitizedAndReturnsToMainThreadAndCloseDropsResponses() throws Exception {
+        try (var receipts = new games.dmg.fantasystick.persistence.EquipmentSessionStore(data, java.time.Clock.systemUTC());
+             var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            UUID owner = UUID.randomUUID(), session = UUID.randomUUID(), character = UUID.randomUUID();
+            receipts.prepare(owner, session, character).toCompletableFuture().get(5, java.util.concurrent.TimeUnit.SECONDS);
+            receipts.recordExit(owner, session, java.time.Duration.ofSeconds(900)).toCompletableFuture().get(5, java.util.concurrent.TimeUnit.SECONDS);
+            f.plugin.setEnabled(true);
+            var sender = new Sender();
+            assertNotNull(f.command);
+            assertTrue(f.command.execute(sender.port, "fantasystick", new String[]{"inspect", owner.toString()}));
+            assertTrue(sender.messages.isEmpty(), "No response until the server callback");
+            var response = f.tasks.poll(5, java.util.concurrent.TimeUnit.SECONDS); assertNotNull(response);
+            response.run();
+            String text = String.join("\n", sender.messages);
+            assertTrue(text.contains(owner.toString()), text);
+            assertTrue(text.contains(session.toString()), text);
+            assertTrue(text.contains(character.toString()), text);
+            assertTrue(text.contains("pending") && text.contains("deadline") && text.contains("exit"), text);
+            assertFalse(text.contains("schema-version") || text.contains(data.toString()), text);
+            sender.messages.clear();
+            f.command.execute(sender.port, "fantasystick", new String[]{"inspect", owner.toString()});
+            var stale = f.tasks.poll(5, java.util.concurrent.TimeUnit.SECONDS); assertNotNull(stale);
+            f.plugin.setEnabled(false);
+            f.plugin.setEnabled(true);
+            stale.run();
+            assertTrue(sender.messages.isEmpty(), "Previous lifetime must not reply after re-enable");
+        }
+    }
+
+    @Test void onlineRecoveryUsesNativeProofAndReportsOnlyARequestAndOfflineNeverQueuesIO() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var sender = new Sender(); UUID offline = UUID.randomUUID();
+            f.command.execute(sender.port, "fantasystick", new String[]{"recover", offline.toString()});
+            assertTrue(sender.messages.getLast().contains("must be online"));
+            assertFalse(Files.exists(data.resolve("sessions"))); assertTrue(f.tasks.isEmpty());
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); f.players.put(a.core.id, a.player);
+            var original = a.core.snapshot(); UUID session = UUID.randomUUID();
+            f.receipts().prepare(a.core.id, session, a.core.record.id()).toCompletableFuture().get(5, java.util.concurrent.TimeUnit.SECONDS);
+            assertEquals(games.dmg.fantasystick.items.EquipmentStorage.PackResult.PACKED,
+                new games.dmg.fantasystick.items.EquipmentStorage().pack(a.core.inventory, a.core.id, session));
+            a.core.marker(session, "PACKED"); var packed = a.core.snapshot();
+            sender.messages.clear();
+            f.command.execute(sender.port, "fantasystick", new String[]{"recover", a.core.id.toString()});
+            assertEquals(1, sender.messages.size());
+            assertTrue(sender.messages.getFirst().contains("requested") && sender.messages.getFirst().contains("not confirmation"));
+            assertArrayEquals(packed, a.core.snapshot(), "Request is not premature success");
+            f.tick();
+            assertArrayEquals(original, a.core.snapshot()); assertTrue(a.core.marker().endsWith("|RESTORED"));
+            assertNull(f.receipts().find(a.core.id).toCompletableFuture().get(5, java.util.concurrent.TimeUnit.SECONDS).orElseThrow().pending());
+            f.command.execute(sender.port, "fantasystick", new String[]{"recover", a.core.id.toString()}); f.tick();
+            assertArrayEquals(original, a.core.snapshot());
+        }
+    }
+
+    @Test void ambiguousRecoveryRetainsEveryItemAndReceiptAndInspectionNeverPrintsRawMarker() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); f.players.put(a.core.id, a.player);
+            UUID session = UUID.randomUUID();
+            var saved = f.receipts().prepare(a.core.id, session, a.core.record.id()).toCompletableFuture().get(5, java.util.concurrent.TimeUnit.SECONDS);
+            new games.dmg.fantasystick.items.EquipmentStorage().pack(a.core.inventory, a.core.id, session);
+            a.core.pdc.set(new org.bukkit.NamespacedKey("fantasystick", "equipment_session"),
+                org.bukkit.persistence.PersistentDataType.STRING, "secret-not-a-valid-marker");
+            var before = a.core.snapshot(); var marker = a.core.pdc.serializeToBytes();
+            var sender = new Sender();
+            f.command.execute(sender.port, "fantasystick", new String[]{"recover", a.core.id.toString()}); f.tick();
+            assertArrayEquals(before, a.core.snapshot()); assertArrayEquals(marker, a.core.pdc.serializeToBytes());
+            assertEquals(saved, f.receipts().find(a.core.id).toCompletableFuture().get(5, java.util.concurrent.TimeUnit.SECONDS).orElseThrow());
+            f.command.execute(sender.port, "fantasystick", new String[]{"inspect", a.core.id.toString()}); f.tick();
+            var text = String.join("\n", sender.messages);
+            assertTrue(text.contains("malformed (retained)")); assertTrue(text.contains("active=none"));
+            assertFalse(text.contains("secret-not-a-valid-marker"));
+        }
+    }
+
+    @Test void inspectObservesCurrentOnlineActiveStateAndPermissionRevocationDropsDeferredResponse() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); f.players.put(a.core.id, a.player); f.activate(a);
+            var sender = new Sender();
+            f.command.execute(sender.port, "fantasystick", new String[]{"inspect", a.core.id.toString()}); f.tick();
+            assertTrue(sender.messages.stream().anyMatch(message -> message.contains("active=session=")));
+            assertTrue(sender.messages.stream().anyMatch(message -> message.contains("phase=PACKED")));
+            sender.messages.clear();
+            f.command.execute(sender.port, "fantasystick", new String[]{"inspect", a.core.id.toString()});
+            var pending = f.tasks.poll(5, java.util.concurrent.TimeUnit.SECONDS); assertNotNull(pending);
+            sender.allowed = false; pending.run(); assertTrue(sender.messages.isEmpty());
+            sender.allowed = true;
+            f.command.execute(sender.port, "fantasystick", new String[]{"inspect", a.core.id.toString()});
+            pending = f.tasks.poll(5, java.util.concurrent.TimeUnit.SECONDS); assertNotNull(pending);
+            ((AutoCloseable) f.command.getExecutor()).close(); pending.run(); assertTrue(sender.messages.isEmpty());
+        }
+    }
+
+    static final class Sender {
+        final Thread main = Thread.currentThread();
+        final List<String> messages = new ArrayList<>();
+        boolean allowed = true;
+        final CommandSender port = FantasyStickLifecycleNativeTest.port(CommandSender.class, (name, args) -> {
+            assertSame(main, Thread.currentThread(), "Worker accessed command sender: " + name);
+            return switch (name) {
+                case "hasPermission" -> { assertEquals("fantasystick.admin", args[0]); yield allowed; }
+                case "sendMessage" -> { messages.add(String.valueOf(args[0])); yield null; }
+                default -> throw new AssertionError("Unexpected sender call " + name);
+            };
+        });
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/EquipmentStorageNativeTest.java

@@ -38,6 +38,114 @@ class EquipmentStorageNativeTest {
         });
     }
 
+    @Test
+    void laterClearFailureLeavesEveryOriginalInTheActualNativeBoxWithoutRollback() {
+        var writes = new java.util.concurrent.atomic.AtomicInteger();
+        var armed = new java.util.concurrent.atomic.AtomicBoolean();
+        var inventory = new CraftInventoryPlayer(new Inventory(null, new EntityEquipment()) {
+            @Override public InventoryHolder getOwner() { return null; }
+        }) {
+            @Override public void setItem(int slot, ItemStack item) {
+                super.setItem(slot, item);
+                if (armed.get() && writes.incrementAndGet() == 7) throw new IllegalStateException("Later clear failed");
+            }
+        };
+        int[] slots = {0, 1, 2, 3, 4, 5, 6, 7, 8, 36, 37, 38, 39};
+        for (int i = 0; i < slots.length; i++) inventory.setItem(slots[i], new ItemStack(Material.DIAMOND, i + 1));
+        var original = snapshot(inventory);
+        armed.set(true);
+        assertThrows(IllegalStateException.class, () -> new EquipmentStorage().pack(inventory, UUID.randomUUID(), UUID.randomUUID()));
+        var actualBox = inventory.getItem(9);
+        assertNotNull(actualBox, "A real recovery box must exist before any original is cleared");
+        var nativeContents = CraftItemStack.asNMSCopy(actualBox).get(DataComponents.CONTAINER);
+        assertNotNull(nativeContents);
+        var packed = NonNullList.withSize(27, net.minecraft.world.item.ItemStack.EMPTY);
+        nativeContents.copyInto(packed);
+        for (int i = 0; i < slots.length; i++) assertEquals(original[slots[i]], CraftItemStack.asBukkitCopy(packed.get(i)));
+        assertNull(inventory.getItem(0), "No silent rollback of cleared originals");
+        assertEquals(original[8], inventory.getItem(8), "Uncertain duplicates remain in their original slots");
+    }
+
+    @Test
+    void validatesTheWholeRestoreBeforeReplacingOnlyOwnedControlsAndKeepsOffhandAndHead() {
+        var inventory = inventory();
+        var owner = UUID.randomUUID();
+        var session = UUID.randomUUID();
+        var storage = new EquipmentStorage();
+        var sword = new ItemStack(Material.DIAMOND_SWORD);
+        inventory.setItem(0, sword);
+        var sheet = new ItemStack(Material.PAPER);
+        inventory.setItemInOffHand(sheet);
+        assertEquals(EquipmentStorage.PackResult.PACKED, storage.pack(inventory, owner, session));
+        var control = new ItemStack(Material.STICK);
+        var meta = control.getItemMeta();
+        meta.getPersistentDataContainer().set(new NamespacedKey("fantasystick", "test_session"), PersistentDataType.STRING, session.toString());
+        control.setItemMeta(meta);
+        for (int i = 0; i < 9; i++) inventory.setItem(i, control.clone());
+        inventory.setItem(8, new ItemStack(Material.EMERALD));
+        var before = snapshot(inventory);
+        assertEquals(EquipmentStorage.RestoreResult.OCCUPIED_SLOT,
+            storage.restore(inventory, owner, session, control::equals));
+        assertArrayEquals(before, inventory.getContents(), "Refusal must not strip even owned controls first");
+        inventory.setItem(8, control.clone());
+        for (int i = 10; i < 36; i++) inventory.setItem(i, new ItemStack(Material.STONE, 64));
+        var head = new ItemStack(Material.CARVED_PUMPKIN);
+        inventory.setHelmet(head);
+        assertEquals(EquipmentStorage.RestoreResult.RESTORED,
+            storage.restore(inventory, owner, session, control::equals));
+        assertEquals(sword, inventory.getItem(0));
+        for (int i = 1; i < 9; i++) assertTrue(inventory.getItem(i) == null || inventory.getItem(i).isEmpty());
+        assertEquals(sheet, inventory.getItemInOffHand());
+        assertEquals(head, inventory.getItem(9));
+        assertEquals(EquipmentStorage.RestoreResult.NOT_FOUND,
+            storage.restore(inventory, owner, session, control::equals));
+    }
+
+    @Test
+    void everyBoxLocationRestoresAllThirteenSlotsAndOnlyItsFreedLocationReceivesTheHead() {
+        for (int location : new int[]{35, 40, 41}) for (boolean head : new boolean[]{false, true}) {
+            var inventory = inventory(); var owner = UUID.randomUUID(); var session = UUID.randomUUID();
+            var storage = new EquipmentStorage();
+            int[] slots = {0, 1, 2, 3, 4, 5, 6, 7, 8, 36, 37, 38, 39};
+            for (int i = 0; i < slots.length; i++) inventory.setItem(slots[i], new ItemStack(Material.ARROW, i + 1));
+            var original = snapshot(inventory);
+            assertEquals(EquipmentStorage.PackResult.PACKED, storage.pack(inventory, owner, session));
+            var box = inventory.getItem(9).clone();
+            for (int slot = 9; slot < 36; slot++) inventory.setItem(slot, new ItemStack(Material.STONE, 64));
+            var cursor = new java.util.concurrent.atomic.AtomicReference<>(new ItemStack(Material.DIAMOND, 7));
+            var unrelatedCursor = cursor.get().clone();
+            var offhand = new ItemStack(Material.EMERALD, 3); inventory.setItemInOffHand(offhand);
+            if (location == 41) cursor.set(box); else inventory.setItem(location, box);
+            var displaced = head ? new ItemStack(Material.CARVED_PUMPKIN) : null;
+            inventory.setHelmet(displaced);
+            assertEquals(EquipmentStorage.RestoreResult.RESTORED, storage.restore(inventory, owner, session, cursor.get(), cursor::set));
+            for (int slot : slots) assertEquals(original[slot], inventory.getItem(slot), "Original slot " + slot);
+            for (int slot = 9; slot < 36; slot++) assertEquals(slot == location ? displaced : new ItemStack(Material.STONE, 64), inventory.getItem(slot));
+            if (location == 40 && !head) assertTrue(inventory.getItemInOffHand().isEmpty());
+            else assertEquals(location == 40 ? displaced : offhand, inventory.getItemInOffHand());
+            assertEquals(location == 41 ? displaced : unrelatedCursor, cursor.get());
+            var restored = snapshot(inventory); var restoredCursor = cursor.get();
+            assertEquals(EquipmentStorage.RestoreResult.NOT_FOUND, storage.restore(inventory, owner, session, cursor.get(), cursor::set));
+            assertArrayEquals(restored, inventory.getContents()); assertEquals(restoredCursor, cursor.get());
+        }
+    }
+
+    @Test
+    void duplicatesAcrossMainOffhandAndCursorAreAmbiguousBeforeAnyWrite() {
+        for (int[] pair : new int[][]{{9, 35}, {9, 40}, {9, 41}, {40, 41}}) {
+            var inventory = inventory(); var owner = UUID.randomUUID(); var session = UUID.randomUUID();
+            var storage = new EquipmentStorage(); inventory.setItem(0, new ItemStack(Material.DIAMOND_SWORD));
+            storage.pack(inventory, owner, session);
+            var box = inventory.getItem(9).clone(); inventory.setItem(9, null);
+            var cursor = new java.util.concurrent.atomic.AtomicReference<>(new ItemStack(Material.EMERALD));
+            for (int location : pair) { if (location == 41) cursor.set(box.clone()); else inventory.setItem(location, box.clone()); }
+            var before = snapshot(inventory); var beforeCursor = cursor.get().clone();
+            assertEquals(EquipmentStorage.RestoreResult.AMBIGUOUS,
+                storage.restore(inventory, owner, session, cursor.get(), ignored -> fail("No cursor writes on refusal")));
+            assertArrayEquals(before, inventory.getContents()); assertEquals(beforeCursor, cursor.get());
+        }
+    }
+
     @Test
     void malformedAmbiguousAndOccupiedRestorationPathsLeaveAllItemsUntouched() {
         for (int variant = 0; variant < 6; variant++) {
@@ -84,6 +192,33 @@ class EquipmentStorageNativeTest {
         }
     }
 
+    @Test
+    void cursorAndOffhandRefusalsValidateTheEntireBoxAndDestinationsBeforeMutation() {
+        for (int location : new int[]{40, 41}) for (int invalid = 0; invalid < 4; invalid++) {
+            var inventory = inventory(); var owner = UUID.randomUUID(); var session = UUID.randomUUID();
+            var storage = new EquipmentStorage(); inventory.setItem(0, new ItemStack(Material.DIAMOND_SWORD));
+            storage.pack(inventory, owner, session);
+            var item = inventory.getItem(9).clone(); inventory.setItem(9, null);
+            if (invalid == 0) item.setAmount(2);
+            if (invalid == 1) {
+                var meta = item.getItemMeta();
+                meta.getPersistentDataContainer().set(new NamespacedKey("fantasystick", "storage_slots"), PersistentDataType.INTEGER_ARRAY, new int[]{0});
+                item.setItemMeta(meta);
+            }
+            if (invalid == 2) {
+                var meta = (BlockStateMeta) item.getItemMeta(); var box = (ShulkerBox) meta.getBlockState();
+                box.getInventory().setItem(26, new ItemStack(Material.EMERALD)); meta.setBlockState(box); item.setItemMeta(meta);
+            }
+            if (invalid == 3) inventory.setItem(8, new ItemStack(Material.EMERALD));
+            var cursor = location == 41 ? item : new ItemStack(Material.DIAMOND);
+            if (location == 40) inventory.setItemInOffHand(item);
+            var before = snapshot(inventory); var beforeCursor = cursor.clone();
+            assertEquals(invalid == 3 ? EquipmentStorage.RestoreResult.OCCUPIED_SLOT : EquipmentStorage.RestoreResult.INVALID_BOX,
+                storage.restore(inventory, owner, session, cursor, ignored -> fail("Refusal cannot write cursor")));
+            assertArrayEquals(before, inventory.getContents()); assertEquals(beforeCursor, cursor);
+        }
+    }
+
     @Test
     void eligibilityMatchesTheActualVanillaShulkerSlotForEveryNativeItemMaterial() {
         var nativeSlot = new net.minecraft.world.inventory.ShulkerBoxSlot(new net.minecraft.world.SimpleContainer(27), 0, 0, 0);
@@ -118,9 +253,14 @@ class EquipmentStorageNativeTest {
         inventory.setItemInOffHand(new ItemStack(Material.PAPER));
         var before = snapshot(inventory);
         var storage = new EquipmentStorage();
+        assertEquals(EquipmentStorage.PackResult.NO_SPACE, storage.refusal(inventory, UUID.randomUUID(), UUID.randomUUID()).orElseThrow());
+        assertArrayEquals(before, inventory.getContents());
         assertEquals(EquipmentStorage.PackResult.NO_SPACE, storage.pack(inventory, UUID.randomUUID(), UUID.randomUUID()));
         assertArrayEquals(before, inventory.getContents());
         inventory.setItem(35, null);
+        var eligible = snapshot(inventory);
+        assertTrue(storage.refusal(inventory, UUID.randomUUID(), UUID.randomUUID()).isEmpty());
+        assertArrayEquals(eligible, inventory.getContents());
         assertEquals(EquipmentStorage.PackResult.PACKED, storage.pack(inventory, UUID.randomUUID(), UUID.randomUUID()));
         assertEquals(Material.SHULKER_BOX, inventory.getItem(35).getType());
     }

src/nativeTest/java/games/dmg/fantasystick/FantasyHealthNativeTest.java

@@ -0,0 +1,384 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import java.nio.file.Path;
+import java.util.concurrent.TimeUnit;
+import org.bukkit.attribute.Attribute;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class FantasyHealthNativeTest {
+    @TempDir Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test void nativeMaximumIgnoresBonusesPenaltiesAndHealthBoostWhileTheirOrdinaryOwnershipAndExpiryRemainIntact() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player);
+            var bonus = modifier("bonus", 5, net.minecraft.world.entity.ai.attributes.AttributeModifier.Operation.ADD_VALUE);
+            var penalty = modifier("penalty", -0.5, net.minecraft.world.entity.ai.attributes.AttributeModifier.Operation.ADD_MULTIPLIED_TOTAL);
+            a.maximumHealth.addTransientModifier(bonus); a.maximumHealth.addTransientModifier(penalty);
+            var boost = net.minecraft.world.effect.MobEffects.HEALTH_BOOST.value();
+            boost.addAttributeModifiers(a.healthAttributes, 1);
+            a.player.setHealth(12); a.player.setFoodLevel(7); a.player.setSaturation(2); a.player.setExhaustion(3);
+            f.activate(a);
+            assertEquals(10, a.maximumHealth.getValue());
+            a.player.setHealth(6);
+            a.maximumHealth.setBaseValue(30); // A later legitimate ordinary base change must survive exit.
+            var later = modifier("later", 4, net.minecraft.world.entity.ai.attributes.AttributeModifier.Operation.ADD_VALUE);
+            a.maximumHealth.addPermanentModifier(later);
+            boost.addAttributeModifiers(a.healthAttributes, 2);
+            assertEquals(10, a.maximumHealth.getValue(), "New native potion modifiers cannot change fantasy maximum");
+            boost.removeAttributeModifiers(a.healthAttributes);
+            a.maximumHealth.removeModifier(bonus); a.maximumHealth.removeModifier(penalty);
+            var zero = modifier("zero", -1, net.minecraft.world.entity.ai.attributes.AttributeModifier.Operation.ADD_MULTIPLIED_TOTAL);
+            a.maximumHealth.addTransientModifier(zero);
+            assertEquals(10, a.maximumHealth.getValue(), "Even a zero multiplier cannot bypass the native effective-value lease");
+            a.maximumHealth.removeModifier(zero);
+            assertEquals(6, a.player.getHealth());
+            var serialized = a.maximumHealth.pack();
+            assertEquals(30, serialized.baseValue()); assertEquals(java.util.List.of(later), serialized.modifiers());
+            var loaded = new net.minecraft.world.entity.ai.attributes.AttributeInstance(net.minecraft.world.entity.ai.attributes.Attributes.MAX_HEALTH, ignored -> {});
+            loaded.apply(serialized); assertEquals(34, loaded.getValue(), "Player saves retain ordinary attribute ownership, not the fantasy maximum");
+            a.player.setFoodLevel(2); a.player.setSaturation(0); a.player.setExhaustion(1);
+            a.core.inventory.setItemInOffHand(null); f.changed(a);
+            assertEquals(34, a.maximumHealth.getValue()); assertEquals(12, a.player.getHealth());
+            assertEquals(java.util.Set.of(later), a.maximumHealth.getModifiers(), "Expired/removed modifiers are not replayed from a snapshot");
+            assertEquals(7, a.player.getFoodLevel()); assertEquals(2, a.player.getSaturation()); assertEquals(3, a.player.getExhaustion());
+            assertFalse(a.player.isHealthScaled()); assertEquals(20, a.player.getHealthScale());
+        }
+    }
+
+    @Test void activeCharacterBookShowsCurrentNativeDamageRatherThanTheLastSavedHealth() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player); f.activate(a);
+            a.player.setHealth(4);
+            PartyBookNativeTest.open(f, a);
+            assertTrue(PartyBookNativeTest.text(a).contains("Health: 4/10"));
+        }
+    }
+
+    @Test void activeBlueMistAndOneRedDefeatBurstUseWorldLocationsAndStopWithTheSession() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            var ordinary = new FantasyStickLifecycleNativeTest.Actor(data); ordinary.core.inventory.setItemInOffHand(null);
+            f.players.put(a.core.id, a.player); f.players.put(ordinary.core.id, ordinary.player);
+            var entry = a.player.getLocation(); f.activate(a);
+            f.pulses.forEach(Runnable::run);
+            assertTrue(dust(a, org.bukkit.Color.BLUE) > 0, "Active fantasy mode must have visible public blue particles");
+            assertEquals(0, dust(ordinary, org.bukkit.Color.BLUE));
+            a.core.location.add(20, 0, 20);
+            var defeatLocation = a.player.getLocation().add(0, 1, 0);
+            var source = new org.bukkit.craftbukkit.damage.CraftDamageSource(new net.minecraft.world.damagesource.DamageSource(
+                org.bukkit.craftbukkit.damage.CraftDamageType.bukkitToMinecraftHolder(org.bukkit.damage.DamageType.OUT_OF_WORLD)));
+            var death = new org.bukkit.event.entity.PlayerDeathEvent(a.player, source, new java.util.ArrayList<>(), 0,
+                net.kyori.adventure.text.Component.empty(), true);
+            f.dispatcher.accept(death); assertTrue(death.isCancelled());
+            PartyBookNativeTest.drain(f);
+            assertEquals(1, dust(a, org.bukkit.Color.RED));
+            assertTrue(org.mockito.Mockito.mockingDetails(a.world).getInvocations().stream().anyMatch(call ->
+                call.getMethod().getName().equals("spawnParticle") && java.util.Arrays.asList(call.getArguments()).contains(defeatLocation)));
+            assertEquals(entry, a.player.getLocation()); assertEquals(28, a.player.getHealth());
+            var tail = a.core.inventory.getItemInOffHand().clone();
+            assertEquals(org.bukkit.Material.WRITTEN_BOOK, tail.getType()); assertEquals(1, tail.getAmount());
+            long blue = dust(a, org.bukkit.Color.BLUE);
+            f.pulses.forEach(Runnable::run); f.dispatcher.accept(death);
+            assertEquals(blue, dust(a, org.bukkit.Color.BLUE)); assertEquals(1, dust(a, org.bukkit.Color.RED));
+            assertEquals(tail, a.core.inventory.getItemInOffHand());
+            f.plugin.setEnabled(false); f.awaitWorkers();
+            f.pulses.forEach(Runnable::run);
+            assertEquals(blue, dust(a, org.bukkit.Color.BLUE), "Retired timers cannot emit fantasy effects");
+        }
+    }
+
+    @Test void uncappedConstitutionEntersAtTheNativeCeilingAndPersistsOnlyBoundedRemainingHealth() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player);
+            var old = a.core.record;
+            var con = java.math.BigInteger.TEN.pow(1000);
+            var stats = new java.util.EnumMap<games.dmg.fantasystick.progression.Stat, java.math.BigInteger>(games.dmg.fantasystick.progression.Stat.class);
+            stats.putAll(old.stats()); stats.put(games.dmg.fantasystick.progression.Stat.CON, con);
+            var saved = new games.dmg.fantasystick.persistence.CharacterRecord(old.id(), old.name(), old.revision().add(java.math.BigInteger.ONE),
+                stats, old.level(), old.experience(), old.unspentPoints(), new java.math.BigDecimal(con.add(java.math.BigInteger.TEN)),
+                old.learned(), old.loadout(), old.cooldowns(), false, null, null);
+            new games.dmg.fantasystick.persistence.YamlCharacterRepository(data).replace(saved, old.revision());
+            var ceiling = games.dmg.fantasystick.session.NativeHealthLimit.read();
+            f.activate(a);
+            assertEquals(ceiling.doubleValue(), a.maximumHealth.getValue()); assertEquals(ceiling.doubleValue(), a.player.getHealth());
+            a.player.setHealth(3.25);
+            a.core.inventory.setItemInOffHand(null); f.changed(a);
+            var characters = (CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            var suspended = characters.find(old.id()).get(5, TimeUnit.SECONDS).orElseThrow();
+            assertEquals(con, suspended.stats().get(games.dmg.fantasystick.progression.Stat.CON));
+            assertEquals(0, suspended.health().compareTo(new java.math.BigDecimal("3.25")));
+            assertEquals(ceiling, games.dmg.fantasystick.session.NativeHealthLimit.read(), "Never mutate global attribute limits");
+        }
+    }
+
+    @Test void serializedInterruptedSessionRecoversOrdinaryVitalsAndRemainingHealthWithoutReplayingExpiredModifiers() throws Exception {
+        FantasyStickLifecycleNativeTest.Actor a;
+        byte[] nativeProof, characterFile, receiptFile;
+        byte[][] items;
+        net.minecraft.world.entity.ai.attributes.AttributeInstance.Packed ordinaryAttributes;
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            a = new FantasyStickLifecycleNativeTest.Actor(data); f.players.put(a.core.id, a.player);
+            a.player.setHealth(12); a.player.setFoodLevel(7); a.player.setSaturation(2); a.player.setExhaustion(3);
+            net.minecraft.world.effect.MobEffects.HEALTH_BOOST.value().addAttributeModifiers(a.healthAttributes, 1);
+            f.activate(a); a.player.setHealth(4); a.player.setFoodLevel(2);
+            nativeProof = a.core.pdc.serializeToBytes();
+            items = java.util.Arrays.stream(a.core.snapshot()).map(item -> item == null ? null : item.serializeAsBytes()).toArray(byte[][]::new);
+            ordinaryAttributes = a.maximumHealth.pack();
+            characterFile = java.nio.file.Files.readAllBytes(data.resolve("characters").resolve(a.core.record.id() + ".yml"));
+            receiptFile = java.nio.file.Files.readAllBytes(data.resolve("sessions").resolve(a.core.id + ".yml"));
+        }
+        // Recreate one concrete crash window from native item/PDC/attribute and YAML saves.
+        // Orderly fixture disposal above is not mistaken for an actual server crash.
+        java.nio.file.Files.write(data.resolve("characters").resolve(a.core.record.id() + ".yml"), characterFile);
+        java.nio.file.Files.write(data.resolve("sessions").resolve(a.core.id + ".yml"), receiptFile);
+        a.core.inventory.setContents(java.util.Arrays.stream(items).map(bytes -> bytes == null ? null : org.bukkit.inventory.ItemStack.deserializeBytes(bytes))
+            .toArray(org.bukkit.inventory.ItemStack[]::new));
+        a.core.pdc.readFromBytes(nativeProof, true);
+        a.maximumHealth.removeModifiers(); a.maximumHealth.apply(ordinaryAttributes);
+        // Native potion attributes use permanent storage. Exercise the real expiry/removal
+        // hook after load; plugin recovery must not reintroduce that removed modifier.
+        net.minecraft.world.effect.MobEffects.HEALTH_BOOST.value().removeAttributeModifiers(a.healthAttributes);
+        a.core.health = 4; a.food.setFoodLevel(2); a.healthScaled = true; a.healthScale = 10;
+        a.core.gameMode = org.bukkit.GameMode.ADVENTURE;
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.players.put(a.core.id, a.player); f.plugin.setEnabled(true); f.tick();
+            PartyBookNativeTest.drain(f);
+            var receipt = f.receipts().find(a.core.id).toCompletableFuture().get(5, TimeUnit.SECONDS).orElseThrow();
+            assertNull(receipt.pending());
+            assertEquals(org.bukkit.Material.DIAMOND_SWORD, a.core.inventory.getItem(0).getType());
+            assertEquals(28, a.maximumHealth.getValue()); assertTrue(a.maximumHealth.getModifiers().isEmpty());
+            assertEquals(12, a.player.getHealth()); assertEquals(7, a.player.getFoodLevel());
+            assertEquals(2, a.player.getSaturation()); assertEquals(3, a.player.getExhaustion());
+            assertFalse(a.player.isHealthScaled()); assertEquals(0, a.core.teleports);
+            var characters = (CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            assertEquals(0, characters.find(a.core.record.id()).get(5, TimeUnit.SECONDS).orElseThrow().health().compareTo(java.math.BigDecimal.valueOf(4)));
+            // An unrelated later ordinary change cannot be overwritten by a repeated recovery.
+            a.player.setHealth(5); a.player.setFoodLevel(9);
+            ((games.dmg.fantasystick.session.EquipmentSessions) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "sessions")).recover(a.player);
+            f.tick(); assertEquals(5, a.player.getHealth()); assertEquals(9, a.player.getFoodLevel());
+        }
+    }
+
+    @Test void failedEntrySettersAndMissingExitProofNeverLeaveTheNativeMaximumOverridden() throws Exception {
+        for (int route = 0; route < 6; route++) try (var f = new FantasyStickLifecycleNativeTest.Fixture(data.resolve("failure-" + route))) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data.resolve("failure-" + route));
+            f.players.put(a.core.id, a.player);
+            Runnable fail = () -> { a.core.beforeHealth = () -> {}; a.core.healthMutation = () -> {}; throw new IllegalStateException("Native health setter failed"); };
+            if (route == 0) a.core.beforeHealth = fail;
+            if (route == 1) a.core.healthMutation = fail;
+            if (route == 5) a.core.sync = () -> {
+                a.core.sync = () -> {}; a.player.setHealth(3);
+                throw new IllegalStateException("Activation client synchronization failed after native damage");
+            };
+            f.activate(a);
+            if (route >= 2 && route < 5) {
+                a.player.setHealth(4); a.player.setFoodLevel(2);
+                if (route == 2) a.core.pdc.remove(new org.bukkit.NamespacedKey("fantasystick", "vitals_session"));
+                else if (route == 3) org.mockito.Mockito.doThrow(new IllegalStateException("Native equipment update failed")).when(a.nativePlayer).detectEquipmentUpdates();
+                else a.core.beforeMutation = () -> { throw new IllegalStateException("Equipment restoration write failed"); };
+                a.core.inventory.setItemInOffHand(null); f.changed(a);
+                if (route < 4) {
+                    assertEquals(4, a.player.getHealth(), "Missing/uncertain proof cannot authorize a stale ordinary-health replay");
+                    assertEquals(2, a.player.getFoodLevel());
+                }
+            }
+            var sessions = (games.dmg.fantasystick.session.EquipmentSessions) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "sessions");
+            assertTrue(sessions.active(a.core.id).isEmpty());
+            assertEquals(28, a.maximumHealth.getValue(), "Only the owned maximum hook is safe to remove despite an uncertain setter/proof");
+            assertNotNull(f.receipts().find(a.core.id).toCompletableFuture().get(5, TimeUnit.SECONDS).orElseThrow().pending());
+            if (route < 2) {
+                assertEquals(route == 0 ? 20 : 10, a.player.getHealth(), "Do not blindly heal an uncertain native write");
+                assertFalse(a.player.isHealthScaled()); assertEquals(20, a.player.getHealthScale());
+            }
+            if (route >= 4) {
+                assertEquals(20, a.player.getHealth(), "Proven vitals cleanup is independent of uncertain equipment/client state");
+                var characters = (CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+                assertEquals(0, characters.find(a.core.record.id()).get(5, TimeUnit.SECONDS).orElseThrow().health()
+                    .compareTo(java.math.BigDecimal.valueOf(route == 4 ? 4 : 3)));
+            }
+        }
+    }
+
+    @Test void failedHealthWriteRestoresOrdinaryGearButRetainsTheReceiptAndCannotResumeStaleHealth() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); f.players.put(a.core.id, a.player); f.activate(a);
+            var sheet = a.core.inventory.getItemInOffHand().clone(); a.player.setHealth(4);
+            var path = data.resolve("characters").resolve(a.core.record.id() + ".yml");
+            byte[] acknowledged = java.nio.file.Files.readAllBytes(path);
+            try (var channel = java.nio.channels.FileChannel.open(data.resolve("characters/.records.lock"), java.nio.file.StandardOpenOption.WRITE);
+                 var lock = channel.lock()) {
+                assertTrue(lock.isValid());
+                a.core.inventory.setItemInOffHand(null); f.changed(a); PartyBookNativeTest.drain(f);
+                assertNotNull(f.receipts().find(a.core.id).toCompletableFuture().get(5, TimeUnit.SECONDS).orElseThrow().pending());
+                assertArrayEquals(acknowledged, java.nio.file.Files.readAllBytes(path));
+            }
+            assertEquals(org.bukkit.Material.DIAMOND_SWORD, a.core.inventory.getItem(0).getType());
+            assertEquals(28, a.maximumHealth.getValue()); assertEquals(20, a.player.getHealth());
+            a.core.inventory.setItemInOffHand(sheet); f.changed(a); f.tick();
+            var sessions = (games.dmg.fantasystick.session.EquipmentSessions) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "sessions");
+            assertTrue(sessions.active(a.core.id).isEmpty(), "An unacknowledged health save cannot become a free heal on reentry");
+            assertArrayEquals(acknowledged, java.nio.file.Files.readAllBytes(path));
+            assertTrue(a.messages.stream().anyMatch(message -> message.contains("persistence or recovery is pending")));
+        }
+    }
+
+    @Test void delayedRecoveryReadCannotRecreateOwnershipAfterTheHealthSaveAndExitAlreadyCompleted() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); f.players.put(a.core.id, a.player); f.activate(a);
+            var sheet = a.core.inventory.getItemInOffHand().clone(); a.player.setHealth(4);
+            var characters = (CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            var worker = (java.util.concurrent.ExecutorService) FantasyStickLifecycleNativeTest.Fixture.field(characters, "worker");
+            var entered = new java.util.concurrent.CountDownLatch(1); var release = new java.util.concurrent.CountDownLatch(1);
+            var gate = worker.submit(() -> {
+                entered.countDown();
+                try { assertTrue(release.await(5, TimeUnit.SECONDS)); }
+                catch (InterruptedException interrupted) { Thread.currentThread().interrupt(); throw new AssertionError(interrupted); }
+            });
+            try {
+                assertTrue(entered.await(5, TimeUnit.SECONDS));
+                a.core.inventory.setItemInOffHand(null); f.changed(a);
+                assertNotNull(f.receipts().find(a.core.id).toCompletableFuture().get(5, TimeUnit.SECONDS).orElseThrow().pending());
+                var sessions = (games.dmg.fantasystick.session.EquipmentSessions) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "sessions");
+                sessions.recover(a.player);
+                var stale = f.tasks.poll(5, TimeUnit.SECONDS); assertNotNull(stale);
+                release.countDown(); gate.get(5, TimeUnit.SECONDS);
+                characters.find(a.core.record.id()).get(5, TimeUnit.SECONDS);
+                assertNull(f.receipts().find(a.core.id).toCompletableFuture().get(5, TimeUnit.SECONDS).orElseThrow().pending());
+                stale.run();
+                a.core.inventory.setItemInOffHand(sheet); f.changed(a); f.tick();
+                assertFalse(a.messages.stream().anyMatch(message -> message.contains("persistence or recovery is pending")),
+                    "A delayed old receipt must not manufacture a new ownership blocker after acknowledged exit");
+                f.tick(); f.tick(); assertTrue(sessions.active(a.core.id).isPresent()); assertEquals(4, a.player.getHealth());
+            } finally { release.countDown(); }
+        }
+    }
+
+    @Test void nativeHealthChangesDuringClientScaleDeliveryAreNotOverwrittenByInitialActivation() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); f.players.put(a.core.id, a.player);
+            a.scaleMutation = () -> {
+                a.scaleMutation = () -> {};
+                a.player.setHealth(Math.min(a.player.getHealth(), a.maximumHealth.getValue()) - 1);
+            };
+            f.activate(a);
+            assertEquals(9, a.player.getHealth(), "Native damage during a reentrant client update must not be replaced with another full-health initialization");
+        }
+    }
+
+    @Test void quitAndDisablePersistDamageAndRestoreOnlyOwnedOrdinaryVitalsAndDisplay() throws Exception {
+        for (boolean quit : new boolean[]{true, false}) try (var f = new FantasyStickLifecycleNativeTest.Fixture(data.resolve("lifecycle-" + quit))) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data.resolve("lifecycle-" + quit)); f.players.put(a.core.id, a.player);
+            a.player.setHealth(12); a.player.setFoodLevel(7); a.player.setSaturation(2); a.player.setExhaustion(3);
+            f.activate(a); a.player.setHealth(4); a.player.setFoodLevel(1);
+            a.maximumHealth.setBaseValue(8); // A legitimate later ordinary maximum, below the pre-entry health.
+            a.player.setHealthScale(44); // A later display owner's value is not ours to undo.
+            if (quit) {
+                a.core.online = false;
+                f.dispatcher.accept(new org.bukkit.event.player.PlayerQuitEvent(a.player, net.kyori.adventure.text.Component.empty()));
+                PartyBookNativeTest.drain(f);
+                f.receipts().find(a.core.id).toCompletableFuture().get(5, TimeUnit.SECONDS);
+            } else { f.plugin.setEnabled(false); f.awaitWorkers(); }
+            assertEquals(8, a.maximumHealth.getValue()); assertEquals(8, a.player.getHealth());
+            assertEquals(7, a.player.getFoodLevel()); assertEquals(2, a.player.getSaturation()); assertEquals(3, a.player.getExhaustion());
+            assertEquals(44, a.player.getHealthScale()); assertTrue(a.player.isHealthScaled());
+            assertEquals(org.bukkit.Material.DIAMOND_SWORD, a.core.inventory.getItem(0).getType());
+            var saved = new games.dmg.fantasystick.persistence.YamlCharacterRepository(data.resolve("lifecycle-" + quit)).load(a.core.record.id()).orElseThrow();
+            assertFalse(saved.dead()); assertEquals(0, saved.health().compareTo(java.math.BigDecimal.valueOf(4))); assertEquals(0, a.core.teleports);
+        }
+    }
+
+    @Test void aDamagedTransferredCharacterNeverTransfersItsFormerHoldersOrdinaryVitals() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); var b = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player); f.players.put(b.core.id, b.player);
+            a.player.setHealth(12); a.player.setFoodLevel(7);
+            b.player.setHealth(19); b.player.setFoodLevel(3);
+            var sheet = a.core.inventory.getItemInOffHand().clone(); f.activate(a); a.player.setHealth(3);
+            a.core.inventory.setItemInOffHand(null); f.changed(a); PartyBookNativeTest.drain(f);
+            f.receipts().find(a.core.id).toCompletableFuture().get(5, TimeUnit.SECONDS);
+            b.core.inventory.setItemInOffHand(sheet); f.activate(b);
+            assertEquals(3, b.player.getHealth()); assertEquals(12, a.player.getHealth()); assertEquals(7, a.player.getFoodLevel());
+            b.player.setHealth(2); b.core.inventory.setItemInOffHand(null); f.changed(b); PartyBookNativeTest.drain(f);
+            assertEquals(19, b.player.getHealth()); assertEquals(3, b.player.getFoodLevel());
+            var characters = (CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            assertEquals(0, characters.find(a.core.record.id()).get(5, TimeUnit.SECONDS).orElseThrow().health().compareTo(java.math.BigDecimal.valueOf(2)));
+            assertEquals(b.core.record, characters.find(b.core.record.id()).get(5, TimeUnit.SECONDS).orElseThrow());
+        }
+    }
+
+    @Test void shuttingDownMaximumHooksContinuesAfterAnOriginalNativeObserverThrows() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var throwNow = new java.util.concurrent.atomic.AtomicBoolean();
+            var attributes = new java.util.ArrayList<net.minecraft.world.entity.ai.attributes.AttributeInstance>();
+            for (int i = 0; i < 2; i++) {
+                var a = new FantasyStickLifecycleNativeTest.Actor(data); f.players.put(a.core.id, a.player);
+                var attribute = new net.minecraft.world.entity.ai.attributes.AttributeInstance(net.minecraft.world.entity.ai.attributes.Attributes.MAX_HEALTH,
+                    ignored -> { if (throwNow.get()) throw new IllegalStateException("Native dirty observer failed during cleanup"); });
+                attributes.add(attribute);
+                org.mockito.Mockito.when(a.nativePlayer.getAttribute(net.minecraft.world.entity.ai.attributes.Attributes.MAX_HEALTH)).thenReturn(attribute);
+                f.activate(a); assertEquals(10, attribute.getValue());
+            }
+            throwNow.set(true);
+            var vitals = (games.dmg.fantasystick.session.SessionVitals) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "vitals");
+            var failure = assertThrows(IllegalStateException.class, vitals::close);
+            assertEquals(2, failure.getSuppressed().length);
+            for (var attribute : attributes) assertEquals(20, attribute.getValue(), "Every player's hook must be retired despite another cleanup failure");
+        }
+    }
+
+    private static long dust(FantasyStickLifecycleNativeTest.Actor a, org.bukkit.Color color) {
+        return org.mockito.Mockito.mockingDetails(a.world).getInvocations().stream().filter(call ->
+            call.getMethod().getName().equals("spawnParticle") && java.util.Arrays.stream(call.getArguments())
+                .anyMatch(argument -> argument instanceof org.bukkit.Particle.DustOptions dust && dust.getColor().equals(color))).count();
+    }
+
+    private static net.minecraft.world.entity.ai.attributes.AttributeModifier modifier(String name, double amount,
+            net.minecraft.world.entity.ai.attributes.AttributeModifier.Operation operation) {
+        return new net.minecraft.world.entity.ai.attributes.AttributeModifier(net.minecraft.resources.Identifier.fromNamespaceAndPath("test", name), amount, operation);
+    }
+
+    @Test void actualOffhandEntryAppliesFantasyHealthAndExitRestoresOrdinaryHealthWithoutHealingTheCharacter() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player);
+            double ordinaryHealth = a.player.getHealth();
+            double ordinaryMaximum = a.player.getAttribute(Attribute.MAX_HEALTH).getValue();
+            var sheet = a.core.inventory.getItemInOffHand().clone();
+            f.activate(a);
+            assertEquals(10, a.player.getAttribute(Attribute.MAX_HEALTH).getValue());
+            assertEquals(10, a.player.getHealth(), "A fresh character starts full, independently of ordinary health");
+            a.player.setHealth(4);
+            a.core.inventory.setItemInOffHand(null); f.changed(a);
+            assertEquals(ordinaryMaximum, a.player.getAttribute(Attribute.MAX_HEALTH).getValue());
+            assertEquals(ordinaryHealth, a.player.getHealth());
+            var characters = (CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            var saved = characters.find(a.core.record.id()).get(5, TimeUnit.SECONDS).orElseThrow();
+            assertEquals(0, saved.health().compareTo(java.math.BigDecimal.valueOf(4)));
+            f.receipts().find(a.core.id).toCompletableFuture().get(5, TimeUnit.SECONDS);
+            a.core.inventory.setItemInOffHand(sheet); f.activate(a);
+            assertEquals(4, a.player.getHealth(), "Resuming does not replay a first-activation heal");
+        }
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/FireballNativeTest.java

@@ -0,0 +1,388 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.math.BigInteger;
+import java.nio.file.Path;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class FireballNativeTest {
+    @TempDir Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test void bookAcquisitionEquippedUseAndDirectHitDealOneAttributedScaledDamageWithCooldown() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); withInt(data, a, 12);
+            f.players.put(a.core.id, a.player); f.activate(a);
+            a.core.inventory.getInventory().setSelectedSlot(0);
+            PartyBookNativeTest.open(f, a);
+            assertTrue(PartyBookNativeTest.text(a).contains("Fireball"));
+            assertTrue(PartyBookNativeTest.text(a).contains("INT 12"));
+            PartyBookNativeTest.click(f, a, PartyBookNativeTest.button(a, "[Learn]"));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            PartyBookNativeTest.click(f, a, PartyBookNativeTest.button(a, "[3]"));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var storage = (games.dmg.fantasystick.persistence.CharacterStorage)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            var assigned = storage.find(a.core.record.id()).get().orElseThrow();
+            assertTrue(assigned.learned().contains("fireball")); assertEquals("fireball", assigned.loadout().getFirst());
+            assertEquals(BigInteger.valueOf(39), assigned.unspentPoints());
+            assertEquals(org.bukkit.Material.SNOWBALL, a.core.inventory.getItem(2).getType());
+
+            org.mockito.Mockito.when(a.world.getUID()).thenReturn(java.util.UUID.randomUUID());
+            var eye = new org.bukkit.Location(a.world, 0, 65.6, 0);
+            eye.setDirection(new org.bukkit.util.Vector(1, 0, 0));
+            org.mockito.Mockito.doReturn(eye).when(a.player).getEyeLocation();
+            var projectile = projectile(a, new org.bukkit.Location(a.world, 10, 65.6, 0));
+            var launches = new java.util.concurrent.atomic.AtomicInteger();
+            var launchedVelocity = new java.util.concurrent.atomic.AtomicReference<org.bukkit.util.Vector>();
+            org.mockito.Mockito.doAnswer(call -> {
+                launches.incrementAndGet(); launchedVelocity.set(call.getArgument(1));
+                f.dispatcher.accept(new org.bukkit.event.entity.ProjectileLaunchEvent(projectile));
+                return projectile;
+            }).when(a.player).launchProjectile(org.mockito.ArgumentMatchers.eq(org.bukkit.entity.Snowball.class),
+                org.mockito.ArgumentMatchers.any(org.bukkit.util.Vector.class));
+            a.core.inventory.getInventory().setSelectedSlot(2);
+            var cast = new org.bukkit.event.player.PlayerInteractEvent(a.player, org.bukkit.event.block.Action.RIGHT_CLICK_AIR,
+                a.core.inventory.getItem(2), null, org.bukkit.block.BlockFace.SELF, org.bukkit.inventory.EquipmentSlot.HAND);
+            f.dispatcher.accept(cast); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            assertEquals(org.bukkit.event.Event.Result.DENY, cast.useItemInHand()); assertEquals(1, launches.get());
+            org.mockito.Mockito.verify(projectile).setVisualFire(true);
+            assertEquals(new org.bukkit.util.Vector(1, 0, 0), launchedVelocity.get());
+
+            var target = org.mockito.Mockito.mock(org.bukkit.entity.LivingEntity.class);
+            org.mockito.Mockito.when(target.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+            org.mockito.Mockito.when(target.getType()).thenReturn(org.bukkit.entity.EntityType.ZOMBIE);
+            org.mockito.Mockito.when(target.getLocation()).thenReturn(new org.bukkit.Location(a.world, 10, 65.6, 0));
+            var damages = new java.util.ArrayList<org.bukkit.event.entity.EntityDamageByEntityEvent>();
+            org.mockito.Mockito.doAnswer(call -> {
+                var source = (org.bukkit.damage.DamageSource) call.getArgument(1);
+                var event = new org.bukkit.event.entity.EntityDamageByEntityEvent(projectile, target,
+                    org.bukkit.event.entity.EntityDamageEvent.DamageCause.PROJECTILE, source, (Double) call.getArgument(0));
+                damages.add(event); f.dispatcher.accept(event); return null;
+            }).when(target).damage(org.mockito.ArgumentMatchers.anyDouble(), org.mockito.ArgumentMatchers.any(org.bukkit.damage.DamageSource.class));
+            f.dispatcher.accept(new org.bukkit.event.entity.ProjectileHitEvent(projectile, target));
+            assertEquals(1, damages.size()); assertEquals(7.0, damages.getFirst().getDamage());
+            assertFalse(damages.getFirst().isCancelled());
+            assertSame(projectile, damages.getFirst().getDamager());
+            assertEquals(org.bukkit.damage.DamageType.FIREBALL, damages.getFirst().getDamageSource().getDamageType());
+            f.dispatcher.accept(new org.bukkit.event.entity.EntityDeathEvent(target, damages.getFirst().getDamageSource(),
+                new java.util.ArrayList<>(), 0));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            assertEquals(BigInteger.TEN, storage.find(a.core.record.id()).get().orElseThrow().experience(),
+                "Native projectile attribution reaches the originating character's combat XP");
+            org.mockito.Mockito.verify(projectile, org.mockito.Mockito.atLeastOnce()).remove();
+            f.dispatcher.accept(new org.bukkit.event.entity.ProjectileHitEvent(projectile, target));
+            assertEquals(1, damages.size(), "A projectile can deal custom damage only once");
+
+            f.dispatcher.accept(new org.bukkit.event.player.PlayerInteractEvent(a.player, org.bukkit.event.block.Action.RIGHT_CLICK_AIR,
+                a.core.inventory.getItem(2), null, org.bukkit.block.BlockFace.SELF, org.bukkit.inventory.EquipmentSlot.HAND));
+            PartyBookNativeTest.drain(f);
+            assertEquals(1, launches.get(), "The persisted four-second deadline refuses immediate reuse");
+            assertTrue(a.messages.stream().anyMatch(message -> message.contains("ready in")));
+            var deadline = storage.find(a.core.record.id()).get().orElseThrow().cooldowns().get("fireball");
+            assertTrue(deadline.isAfter(java.time.Instant.now()));
+
+            var sheet = a.core.inventory.getItemInOffHand().clone();
+            a.core.inventory.setItemInOffHand(null); f.changed(a); PartyBookNativeTest.drain(f); f.awaitCharacterAndReceipt(a);
+            a.core.inventory.setItemInOffHand(sheet); f.activate(a);
+            a.core.inventory.getInventory().setSelectedSlot(2);
+            assertEquals("fireball", new games.dmg.fantasystick.items.SessionControls(
+                (games.dmg.fantasystick.ability.AbilityRegistry) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "abilityRegistry"))
+                .ability(a.core.inventory.getItem(2)).orElseThrow());
+            f.dispatcher.accept(new org.bukkit.event.player.PlayerInteractEvent(a.player, org.bukkit.event.block.Action.RIGHT_CLICK_AIR,
+                a.core.inventory.getItem(2), null, org.bukkit.block.BlockFace.SELF, org.bukkit.inventory.EquipmentSlot.HAND));
+            PartyBookNativeTest.drain(f);
+            assertEquals(1, launches.get(), "Exit/resume and control reconstruction preserve the same Fireball deadline");
+            assertEquals(deadline, storage.find(a.core.record.id()).get().orElseThrow().cooldowns().get("fireball"));
+        }
+    }
+
+    @Test void bookUnlearnRefundsOnceClearsOwnedFireballAndRetainsDeadlineThroughReuse() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); withInt(data, a, 12);
+            f.players.put(a.core.id, a.player); f.activate(a);
+            a.core.inventory.getInventory().setSelectedSlot(0); PartyBookNativeTest.open(f, a);
+            PartyBookNativeTest.click(f, a, PartyBookNativeTest.button(a, "[Learn]"));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            PartyBookNativeTest.click(f, a, PartyBookNativeTest.button(a, "[3]"));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var storage = (games.dmg.fantasystick.persistence.CharacterStorage)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            org.mockito.Mockito.when(a.world.getUID()).thenReturn(java.util.UUID.randomUUID());
+            var projectile = projectile(a, new org.bukkit.Location(a.world, 1, 65.6, 0));
+            var launches = new java.util.concurrent.atomic.AtomicInteger();
+            var eye = new org.bukkit.Location(a.world, 0, 65.6, 0); eye.setDirection(new org.bukkit.util.Vector(1, 0, 0));
+            org.mockito.Mockito.doReturn(eye).when(a.player).getEyeLocation();
+            org.mockito.Mockito.doAnswer(call -> { launches.incrementAndGet(); return projectile; }).when(a.player)
+                .launchProjectile(org.mockito.ArgumentMatchers.eq(org.bukkit.entity.Snowball.class),
+                    org.mockito.ArgumentMatchers.any(org.bukkit.util.Vector.class));
+            cast(f, a);
+            var cast = storage.find(a.core.record.id()).get().orElseThrow();
+            var deadline = cast.cooldowns().get("fireball"); assertNotNull(deadline); assertEquals(1, launches.get());
+
+            a.core.inventory.getInventory().setSelectedSlot(0); PartyBookNativeTest.open(f, a);
+            var content = org.bukkit.craftbukkit.inventory.CraftItemStack.asNMSCopy(a.books.getLast())
+                .get(net.minecraft.core.component.DataComponents.WRITTEN_BOOK_CONTENT);
+            for (var page : content.pages()) for (String line : page.raw().getString().split("\\n", -1)) {
+                assertTrue(line.codePoints().map(cp -> cp < 128 ? 6 : 9).sum() <= 108,
+                    "Learned ability action exceeds native visible width: " + line);
+            }
+            var unlearn = PartyBookNativeTest.button(a, "[Unlearn]");
+            PartyBookNativeTest.click(f, a, unlearn); PartyBookNativeTest.click(f, a, unlearn);
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var refunded = storage.find(a.core.record.id()).get().orElseThrow();
+            assertEquals(BigInteger.valueOf(40), refunded.unspentPoints());
+            assertFalse(refunded.learned().contains("fireball"));
+            assertTrue(refunded.loadout().stream().noneMatch("fireball"::equals));
+            assertEquals(deadline, refunded.cooldowns().get("fireball"));
+            org.mockito.Mockito.verify(projectile, org.mockito.Mockito.atLeastOnce()).remove();
+            assertTrue(new games.dmg.fantasystick.items.SessionControls(
+                (games.dmg.fantasystick.ability.AbilityRegistry) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "abilityRegistry"))
+                .ability(a.core.inventory.getItem(2)).isEmpty());
+
+            PartyBookNativeTest.click(f, a, PartyBookNativeTest.button(a, "[+1 WIS]"));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var spent = storage.find(a.core.record.id()).get().orElseThrow();
+            assertEquals(BigInteger.ONE, spent.stats().get(games.dmg.fantasystick.progression.Stat.WIS));
+            assertEquals(BigInteger.valueOf(39), spent.unspentPoints());
+            PartyBookNativeTest.click(f, a, PartyBookNativeTest.button(a, "[Learn]"));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            PartyBookNativeTest.click(f, a, PartyBookNativeTest.button(a, "[3]"));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            assertEquals(deadline, storage.find(a.core.record.id()).get().orElseThrow().cooldowns().get("fireball"));
+            cast(f, a); assertEquals(1, launches.get());
+            assertTrue(a.messages.stream().anyMatch(message -> message.contains("ready in")));
+
+            var transferredSheet = a.core.inventory.getItemInOffHand().clone();
+            a.core.inventory.setItemInOffHand(null); f.changed(a); PartyBookNativeTest.drain(f); f.awaitCharacterAndReceipt(a);
+            var b = new FantasyStickLifecycleNativeTest.Actor(data); b.core.inventory.setItemInOffHand(transferredSheet);
+            f.players.put(b.core.id, b.player); f.activate(b);
+            b.core.inventory.getInventory().setSelectedSlot(2);
+            assertEquals("fireball", new games.dmg.fantasystick.items.SessionControls(
+                (games.dmg.fantasystick.ability.AbilityRegistry) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "abilityRegistry"))
+                .ability(b.core.inventory.getItem(2)).orElseThrow());
+            f.dispatcher.accept(new org.bukkit.event.player.PlayerInteractEvent(b.player, org.bukkit.event.block.Action.RIGHT_CLICK_AIR,
+                b.core.inventory.getItem(2), null, org.bukkit.block.BlockFace.SELF, org.bukkit.inventory.EquipmentSlot.HAND));
+            PartyBookNativeTest.drain(f);
+            assertTrue(b.messages.stream().anyMatch(message -> message.contains("ready in")),
+                "Transfer/reload must retain the original Fireball deadline after refund and relearn");
+        }
+    }
+
+    @Test void partyAndMixedModeProjectileHitsPreserveProtectionCancellation() throws Exception {
+        java.nio.file.Files.writeString(data.resolve("config.yml"), "fireball-cooldown-seconds: 0\n");
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            var b = new FantasyStickLifecycleNativeTest.Actor(data);
+            withFireball(data, a, 12);
+            f.players.put(a.core.id, a.player); f.players.put(b.core.id, b.player);
+            f.activate(a); f.activate(b);
+            var parties = PartyLifecycleNativeTest.parties(f);
+            var party = parties.create(a.core.id).orElseThrow();
+            assertTrue(parties.accept(b.core.id, parties.invite(a.core.id, party.id(), b.core.id).orElseThrow().id()));
+            org.mockito.Mockito.when(a.world.getUID()).thenReturn(java.util.UUID.randomUUID());
+            var first = projectile(a, new org.bukkit.Location(a.world, 10, 65.6, 0));
+            var second = projectile(a, new org.bukkit.Location(a.world, 10, 65.6, 0));
+            prepareLaunches(f, a, first, second);
+            cast(f, a); var partyHit = new org.bukkit.event.entity.ProjectileHitEvent(first, b.player); f.dispatcher.accept(partyHit);
+            assertTrue(partyHit.isCancelled());
+            org.mockito.Mockito.verify(b.player, org.mockito.Mockito.never()).damage(org.mockito.ArgumentMatchers.anyDouble(),
+                org.mockito.ArgumentMatchers.any(org.bukkit.damage.DamageSource.class));
+
+            var ordinary = org.mockito.Mockito.mock(org.bukkit.entity.Player.class);
+            org.mockito.Mockito.when(ordinary.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+            cast(f, a); var mixedHit = new org.bukkit.event.entity.ProjectileHitEvent(second, ordinary); f.dispatcher.accept(mixedHit);
+            assertTrue(mixedHit.isCancelled());
+            org.mockito.Mockito.verify(ordinary, org.mockito.Mockito.never()).damage(org.mockito.ArgumentMatchers.anyDouble(),
+                org.mockito.ArgumentMatchers.any(org.bukkit.damage.DamageSource.class));
+            assertTrue(org.mockito.Mockito.mockingDetails(a.world).getInvocations().stream()
+                .noneMatch(invocation -> invocation.getMethod().getName().equals("createExplosion")));
+        }
+    }
+
+    @Test void rangeLifetimeAndSessionEndEachRemoveOwnedProjectileWithoutLateDamage() throws Exception {
+        java.nio.file.Files.writeString(data.resolve("config.yml"), "fireball-cooldown-seconds: 0\n");
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); withFireball(data, a, 12);
+            f.players.put(a.core.id, a.player); f.activate(a);
+            org.mockito.Mockito.when(a.world.getUID()).thenReturn(java.util.UUID.randomUUID());
+            var outside = projectile(a, new org.bukkit.Location(a.world, 32.01, 65.6, 0));
+            var boundary = projectile(a, new org.bukkit.Location(a.world, 32, 65.6, 0));
+            var expiring = projectile(a, new org.bukkit.Location(a.world, 1, 65.6, 0));
+            var exiting = projectile(a, new org.bukkit.Location(a.world, 1, 65.6, 0));
+            prepareLaunches(f, a, outside, boundary, expiring, exiting);
+            var target = org.mockito.Mockito.mock(org.bukkit.entity.LivingEntity.class);
+            org.mockito.Mockito.when(target.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+
+            cast(f, a); f.dispatcher.accept(new org.bukkit.event.entity.ProjectileHitEvent(outside, target));
+            org.mockito.Mockito.verify(target, org.mockito.Mockito.never()).damage(org.mockito.ArgumentMatchers.anyDouble(),
+                org.mockito.ArgumentMatchers.any(org.bukkit.damage.DamageSource.class));
+            org.mockito.Mockito.verify(outside, org.mockito.Mockito.atLeastOnce()).remove();
+
+            cast(f, a); f.dispatcher.accept(new org.bukkit.event.entity.ProjectileHitEvent(boundary, target));
+            org.mockito.Mockito.verify(target).damage(org.mockito.ArgumentMatchers.eq(7.0),
+                org.mockito.ArgumentMatchers.any(org.bukkit.damage.DamageSource.class));
+
+            cast(f, a); Runnable lifetime = f.delayed.getLast(); lifetime.run();
+            org.mockito.Mockito.verify(expiring, org.mockito.Mockito.atLeastOnce()).remove();
+            f.dispatcher.accept(new org.bukkit.event.entity.ProjectileHitEvent(expiring, target));
+            org.mockito.Mockito.verify(target, org.mockito.Mockito.times(1)).damage(org.mockito.ArgumentMatchers.eq(7.0),
+                org.mockito.ArgumentMatchers.any(org.bukkit.damage.DamageSource.class));
+
+            cast(f, a);
+            a.core.inventory.setItemInOffHand(null); f.changed(a); PartyBookNativeTest.drain(f); f.awaitCharacterAndReceipt(a);
+            ((games.dmg.fantasystick.ability.AbilityEngine) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "abilityEngine")).sweep();
+            org.mockito.Mockito.verify(exiting, org.mockito.Mockito.atLeastOnce()).remove();
+        }
+    }
+
+    @Test void validatedConfiguredBalanceReachesTheRegisteredDefinition() throws Exception {
+        java.nio.file.Files.writeString(data.resolve("config.yml"), "fireball-base-damage: 9\n"
+            + "fireball-cooldown-seconds: 2\nfireball-range-blocks: 40\nfireball-lifetime-seconds: 7\n");
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var registry = (games.dmg.fantasystick.ability.AbilityRegistry)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "abilityRegistry");
+            var definition = registry.find("fireball").orElseThrow();
+            assertEquals(java.time.Duration.ofSeconds(2), definition.cooldown());
+            assertEquals(new java.math.BigDecimal("9"), definition.parameters().get("base-damage"));
+            assertEquals(0, new java.math.BigDecimal("40").compareTo(definition.parameters().get("range")));
+            assertEquals(new java.math.BigDecimal("7"), definition.parameters().get("lifetime"));
+            assertTrue(String.join(" ", definition.lore()).contains("Deals 9"));
+        }
+    }
+
+    @Test void failedCooldownPersistenceLaunchesNoProjectileOrFreeEffect() {
+        var storage = org.mockito.Mockito.mock(games.dmg.fantasystick.persistence.CharacterStorage.class);
+        var sessions = org.mockito.Mockito.mock(games.dmg.fantasystick.session.EquipmentSessions.class);
+        var parties = new games.dmg.fantasystick.party.PartyRoster(java.time.Clock.systemUTC(), ignored -> true);
+        var registry = new games.dmg.fantasystick.ability.AbilityRegistry();
+        var fireball = new games.dmg.fantasystick.ability.Fireball(games.dmg.fantasystick.ability.Fireball.Settings.defaults());
+        registry.register(fireball.definition());
+        var base = new games.dmg.fantasystick.crafting.CharacterFactory().create(
+            games.dmg.fantasystick.progression.ProgressionRules.defaults());
+        var stats = new java.util.EnumMap<>(base.stats());
+        stats.put(games.dmg.fantasystick.progression.Stat.INT, BigInteger.valueOf(12));
+        var record = new games.dmg.fantasystick.persistence.CharacterRecord(base.id(), base.name(), base.revision(), stats,
+            base.level(), base.experience(), base.unspentPoints(), base.health(), java.util.Set.of("fireball"),
+            java.util.List.of("fireball", "", "", "", "", "", ""), base.cooldowns(), base.restrictedKills(), false, null, null);
+        var active = new games.dmg.fantasystick.session.EquipmentSessions.Active(java.util.UUID.randomUUID(),
+            java.util.UUID.randomUUID(), record.id());
+        var player = org.mockito.Mockito.mock(org.bukkit.entity.Player.class);
+        org.mockito.Mockito.when(sessions.current(active)).thenReturn(true);
+        org.mockito.Mockito.when(sessions.currentRecord(active)).thenReturn(java.util.Optional.of(record));
+        var failed = new java.util.concurrent.CompletableFuture<games.dmg.fantasystick.persistence.CharacterStorage.AbilityMutation>();
+        failed.completeExceptionally(new java.io.IOException("simulated cooldown failure"));
+        org.mockito.Mockito.when(storage.commitAbilityCooldown(org.mockito.ArgumentMatchers.eq(record.id()),
+            org.mockito.ArgumentMatchers.eq(record.revision()), org.mockito.ArgumentMatchers.eq("fireball"),
+            org.mockito.ArgumentMatchers.any())).thenReturn(failed);
+        var failures = new java.util.ArrayList<games.dmg.fantasystick.ability.AbilityEngine.Failure>();
+        var engine = new games.dmg.fantasystick.ability.AbilityEngine(registry, storage, sessions, parties,
+            java.time.Clock.systemUTC(), Runnable::run, (delay, action) -> () -> {}, ignored -> {}, failures::add);
+        engine.accept(new games.dmg.fantasystick.session.ControlInput(player, active, 2, "fireball",
+            games.dmg.fantasystick.session.ControlInput.Kind.ABILITY,
+            games.dmg.fantasystick.session.ControlInput.Gesture.USE, null, 0, 0, () -> true));
+        org.mockito.Mockito.verify(player, org.mockito.Mockito.never()).launchProjectile(
+            org.mockito.ArgumentMatchers.eq(org.bukkit.entity.Snowball.class), org.mockito.ArgumentMatchers.any());
+        assertEquals(1, failures.size());
+        engine.close(); fireball.close(); parties.close();
+    }
+
+    @Test void formulaAndPackagedDefinitionMatchTheReviewedFireballContract() throws Exception {
+        assertEquals(BigInteger.valueOf(6), games.dmg.fantasystick.ability.Fireball.damage(BigInteger.TEN));
+        assertEquals(BigInteger.valueOf(7), games.dmg.fantasystick.ability.Fireball.damage(BigInteger.valueOf(12)));
+        assertEquals(BigInteger.valueOf(7), games.dmg.fantasystick.ability.Fireball.damage(BigInteger.valueOf(13)));
+        assertEquals(BigInteger.valueOf(8), games.dmg.fantasystick.ability.Fireball.damage(BigInteger.valueOf(14)));
+        assertEquals(BigInteger.TEN.pow(500).subtract(BigInteger.TEN).divide(BigInteger.TWO).add(BigInteger.valueOf(6)),
+            games.dmg.fantasystick.ability.Fireball.damage(BigInteger.TEN.pow(500)));
+
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var registry = (games.dmg.fantasystick.ability.AbilityRegistry)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "abilityRegistry");
+            var fireball = registry.find("fireball").orElseThrow();
+            assertEquals("Fireball", fireball.name());
+            assertEquals(org.bukkit.Material.SNOWBALL, fireball.icon());
+            assertEquals(java.util.Map.of(games.dmg.fantasystick.progression.Stat.INT, BigInteger.valueOf(12)),
+                fireball.requirements());
+            assertEquals(BigInteger.ONE, fireball.pointCost());
+            assertEquals(java.time.Duration.ofSeconds(4), fireball.cooldown());
+            assertEquals(games.dmg.fantasystick.session.ControlInput.Gesture.USE, fireball.gesture());
+            assertEquals(games.dmg.fantasystick.ability.AbilityDefinition.Activation.PROJECTILE, fireball.activation());
+            assertEquals(new java.math.BigDecimal("32"), fireball.parameters().get("range"));
+            assertEquals(new java.math.BigDecimal("5"), fireball.parameters().get("lifetime"));
+            var unavailable = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(unavailable.core.id, unavailable.player); f.activate(unavailable);
+            unavailable.core.inventory.getInventory().setSelectedSlot(0); PartyBookNativeTest.open(f, unavailable);
+            String unavailableText = PartyBookNativeTest.text(unavailable);
+            assertTrue(unavailableText.replaceAll("\\s+", "").contains("Unavailable:requirements"), unavailableText);
+            assertThrows(AssertionError.class, () -> PartyBookNativeTest.button(unavailable, "[Learn]"));
+        }
+    }
+
+    private static void withFireball(Path data, FantasyStickLifecycleNativeTest.Actor actor, int intelligence) throws Exception {
+        var repository = new games.dmg.fantasystick.persistence.YamlCharacterRepository(data);
+        var old = repository.load(actor.core.record.id()).orElseThrow();
+        var stats = new java.util.EnumMap<>(old.stats());
+        stats.put(games.dmg.fantasystick.progression.Stat.INT, BigInteger.valueOf(intelligence));
+        var saved = new games.dmg.fantasystick.persistence.CharacterRecord(old.id(), old.name(), old.revision().add(BigInteger.ONE),
+            stats, old.level(), old.experience(), old.unspentPoints(), old.health(), java.util.Set.of("fireball"),
+            java.util.List.of("fireball", "", "", "", "", "", ""), old.cooldowns(), old.restrictedKills(), false, null, null);
+        repository.replace(saved, old.revision());
+    }
+
+    private static void prepareLaunches(FantasyStickLifecycleNativeTest.Fixture fixture,
+                                        FantasyStickLifecycleNativeTest.Actor actor,
+                                        org.bukkit.entity.Snowball... projectiles) {
+        var eye = new org.bukkit.Location(actor.world, 0, 65.6, 0);
+        eye.setDirection(new org.bukkit.util.Vector(1, 0, 0));
+        org.mockito.Mockito.doReturn(eye).when(actor.player).getEyeLocation();
+        var queue = new java.util.ArrayDeque<>(java.util.List.of(projectiles));
+        org.mockito.Mockito.doAnswer(call -> {
+            var projectile = queue.removeFirst();
+            fixture.dispatcher.accept(new org.bukkit.event.entity.ProjectileLaunchEvent(projectile));
+            return projectile;
+        }).when(actor.player).launchProjectile(org.mockito.ArgumentMatchers.eq(org.bukkit.entity.Snowball.class),
+            org.mockito.ArgumentMatchers.any(org.bukkit.util.Vector.class));
+    }
+
+    private static void cast(FantasyStickLifecycleNativeTest.Fixture fixture,
+                             FantasyStickLifecycleNativeTest.Actor actor) throws Exception {
+        actor.core.inventory.getInventory().setSelectedSlot(2);
+        fixture.dispatcher.accept(new org.bukkit.event.player.PlayerInteractEvent(actor.player,
+            org.bukkit.event.block.Action.RIGHT_CLICK_AIR, actor.core.inventory.getItem(2), null,
+            org.bukkit.block.BlockFace.SELF, org.bukkit.inventory.EquipmentSlot.HAND));
+        PartyBookNativeTest.drain(fixture); PartyBookNativeTest.drain(fixture);
+    }
+
+    private static void withInt(Path data, FantasyStickLifecycleNativeTest.Actor actor, int intelligence) throws Exception {
+        var repository = new games.dmg.fantasystick.persistence.YamlCharacterRepository(data);
+        var old = repository.load(actor.core.record.id()).orElseThrow();
+        var stats = new java.util.EnumMap<>(old.stats());
+        stats.put(games.dmg.fantasystick.progression.Stat.INT, BigInteger.valueOf(intelligence));
+        var saved = new games.dmg.fantasystick.persistence.CharacterRecord(old.id(), old.name(), old.revision().add(BigInteger.ONE),
+            stats, old.level(), old.experience(), old.unspentPoints(), old.health(), old.learned(), old.loadout(),
+            old.cooldowns(), old.restrictedKills(), false, null, null);
+        repository.replace(saved, old.revision());
+    }
+
+    private static org.bukkit.entity.Snowball projectile(FantasyStickLifecycleNativeTest.Actor actor,
+                                                         org.bukkit.Location location) {
+        var projectile = org.mockito.Mockito.mock(org.bukkit.entity.Snowball.class);
+        org.mockito.Mockito.when(projectile.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+        org.mockito.Mockito.when(projectile.getShooter()).thenReturn(actor.player);
+        org.mockito.Mockito.when(projectile.getLocation()).thenAnswer(ignored -> location.clone());
+        org.mockito.Mockito.when(projectile.getWorld()).thenReturn(location.getWorld());
+        org.mockito.Mockito.when(projectile.getPersistentDataContainer()).thenReturn(
+            new org.bukkit.craftbukkit.persistence.CraftPersistentDataContainer(
+                new org.bukkit.craftbukkit.persistence.CraftPersistentDataTypeRegistry()));
+        return projectile;
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/InventoryJourneyNativeTest.java

@@ -0,0 +1,72 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+import games.dmg.fantasystick.items.SessionControls;
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import games.dmg.fantasystick.session.EquipmentSessions;
+import java.nio.file.Path;
+import java.util.UUID;
+import java.util.concurrent.TimeUnit;
+import org.bukkit.Material;
+import org.bukkit.block.BlockFace;
+import org.bukkit.entity.Item;
+import org.bukkit.event.Event;
+import org.bukkit.event.block.Action;
+import org.bukkit.event.inventory.InventoryMoveItemEvent;
+import org.bukkit.event.player.PlayerDropItemEvent;
+import org.bukkit.event.player.PlayerInteractEvent;
+import org.bukkit.event.player.PlayerItemConsumeEvent;
+import org.bukkit.inventory.EquipmentSlot;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+/** Supported offhand entry -> guarded delivered controls -> actual book -> ordinary exit. */
+class InventoryJourneyNativeTest {
+    @TempDir Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test void allNineDeliveredControlsStayContainedWhileTheActualBookWorksAndTheSheetCanLeave() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player);
+            var ordinary = a.core.snapshot();
+            var sheet = a.core.inventory.getItemInOffHand().clone();
+            f.activate(a);
+            var sessions = (EquipmentSessions) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "sessions");
+            var active = sessions.active(a.core.id).orElseThrow();
+            var delivered = a.core.snapshot();
+            for (int slot = 0; slot < 9; slot++) {
+                var item = a.core.inventory.getItem(slot);
+                var identity = new SessionControls().identify(item).orElseThrow();
+                assertEquals(slot, identity.slot());
+                assertEquals(active.player(), identity.owner());
+                assertEquals(active.session(), identity.session());
+                assertEquals(slot == 0 ? Material.BOOK : slot == 1 ? Material.STICK : Material.GRAY_DYE, item.getType());
+                var entity = mock(Item.class); when(entity.getItemStack()).thenReturn(item);
+                var drop = new PlayerDropItemEvent(a.player, entity);
+                f.dispatcher.accept(drop); assertTrue(drop.isCancelled());
+                var consume = new PlayerItemConsumeEvent(a.player, item, EquipmentSlot.HAND);
+                f.dispatcher.accept(consume); assertTrue(consume.isCancelled());
+                var transfer = new InventoryMoveItemEvent(a.core.inventory, item, a.core.view.getTopInventory(), true);
+                f.dispatcher.accept(transfer); assertTrue(transfer.isCancelled());
+                a.core.inventory.getInventory().setSelectedSlot(slot);
+                var use = new PlayerInteractEvent(a.player, Action.RIGHT_CLICK_AIR, item, null, BlockFace.SELF, EquipmentSlot.HAND);
+                f.dispatcher.accept(use); assertEquals(Event.Result.DENY, use.useItemInHand());
+                var characters = (CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+                characters.find(UUID.randomUUID()).get(5, TimeUnit.SECONDS);
+                Runnable task; while ((task = f.tasks.poll()) != null) task.run();
+                assertEquals(1, a.books.size(), "Only slot 1 opens the actual native book; other delivered controls are inert");
+            }
+            assertArrayEquals(delivered, a.core.snapshot(), "Containment and inspection never consume/export inventory");
+            assertEquals(sheet, a.core.inventory.getItemInOffHand());
+            a.core.inventory.setItemInOffHand(null); f.changed(a);
+            assertTrue(sessions.active(a.core.id).isEmpty(), "Transferable sheet removal exits without a combat lock");
+            ordinary[40] = null;
+            assertArrayEquals(ordinary, a.core.snapshot(), "Ordinary gear is restored without replacing the removed sheet");
+        }
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/ManualCraftDeliveryNativeTest.java

@@ -0,0 +1,261 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import games.dmg.fantasystick.crafting.CharacterFactory;
+import games.dmg.fantasystick.crafting.ManualCraftDelivery;
+import games.dmg.fantasystick.crafting.ManualCraftPlan;
+import games.dmg.fantasystick.items.CharacterSheets;
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import games.dmg.fantasystick.persistence.YamlCharacterRepository;
+import games.dmg.fantasystick.progression.ProgressionRules;
+import java.nio.file.Path;
+import java.time.Clock;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicInteger;
+import org.bukkit.event.inventory.ClickType;
+import org.bukkit.event.inventory.InventoryAction;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class ManualCraftDeliveryNativeTest {
+    @Test
+    void shiftCraftPlacesDistinctSheetsInPlannedSlotsAndPreservesPartialInputMetadataAndCursor() throws Exception {
+        for (int width : new int[] {2, 3}) {
+            var fixture = new ManualCraftPlanNativeTest.Fixture(width, 4);
+            var inputs = fixture.grid.getMatrix();
+            var arranged = new org.bukkit.inventory.ItemStack[width * width];
+            for (int index = 0; index < 4; index++) {
+                var meta = inputs[index].getItemMeta();
+                meta.displayName(net.kyori.adventure.text.Component.text("Named ingredient"));
+                inputs[index].setItemMeta(meta);
+                arranged[width == 2 ? index : 8 - index * 2] = inputs[index];
+            }
+            fixture.grid.setMatrix(arranged);
+            for (int slot = 0; slot < 36; slot++) fixture.inventory.setItem(slot,
+                new org.bukkit.inventory.ItemStack(org.bukkit.Material.COBBLESTONE, 64));
+            fixture.inventory.setItem(8, null);
+            fixture.inventory.setItem(33, null);
+            fixture.view.setCursor(new org.bukkit.inventory.ItemStack(org.bukkit.Material.DIAMOND, 29));
+            var plan = ManualCraftPlan.capture(fixture.event(ClickType.SHIFT_LEFT,
+                InventoryAction.MOVE_TO_OTHER_INVENTORY)).orElseThrow();
+            assertEquals(List.of(8, 33), plan.inventorySlots());
+            var factory = new CharacterFactory();
+            var records = java.util.stream.IntStream.range(0, plan.quantity())
+                .mapToObj(index -> factory.create(ProgressionRules.defaults())).toList();
+            try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+                var batch = storage.prepareCraft(records).ready().join();
+                var changes = new AtomicInteger();
+                fixture.menu.onChange = () -> {
+                    changes.incrementAndGet();
+                    for (var item : fixture.grid.getMatrix()) if (item != null && !item.isEmpty()) {
+                        assertEquals(2, item.getAmount());
+                        assertEquals(net.kyori.adventure.text.Component.text("Named ingredient"), item.getItemMeta().displayName());
+                    }
+                    for (int index = 0; index < records.size(); index++) assertEquals(records.get(index).id(),
+                        new CharacterSheets().identify(fixture.inventory.getItem(plan.inventorySlots().get(index))).orElseThrow());
+                };
+                assertEquals(ManualCraftDelivery.Result.DELIVERED, ManualCraftDelivery.commit(plan, batch, fixture.view));
+                assertEquals(1, changes.get());
+                assertFalse(fixture.inventory.getItem(8).isSimilar(fixture.inventory.getItem(33)));
+                assertEquals(64, fixture.inventory.getItem(12).getAmount());
+                assertEquals(org.bukkit.Material.COBBLESTONE, fixture.inventory.getItem(12).getType());
+                assertEquals(org.bukkit.Material.DIAMOND, fixture.view.getCursor().getType());
+                assertEquals(29, fixture.view.getCursor().getAmount());
+            }
+        }
+    }
+
+    @Test
+    void mismatchedSavedBatchDoesNotConsumeAnythingOrClaimDelivery() throws Exception {
+        for (int quantity : new int[] {1, 3}) {
+            var fixture = new ManualCraftPlanNativeTest.Fixture(2, 2);
+            var plan = ManualCraftPlan.capture(fixture.event(ClickType.SHIFT_LEFT,
+                InventoryAction.MOVE_TO_OTHER_INVENTORY)).orElseThrow();
+            var factory = new CharacterFactory();
+            var records = java.util.stream.IntStream.range(0, quantity)
+                .mapToObj(index -> factory.create(ProgressionRules.defaults())).toList();
+            try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+                var attempt = storage.prepareCraft(records);
+                var batch = attempt.ready().join();
+                assertEquals(ManualCraftDelivery.Result.UNAVAILABLE, ManualCraftDelivery.commit(plan, batch, fixture.view));
+                assertEquals(2, fixture.grid.getMatrix()[0].getAmount());
+                assertNull(fixture.inventory.getItem(8));
+                assertEquals(quantity, attempt.abandon().join().removed().size(),
+                    "An invalid batch must remain provably unissued and cleanable");
+            }
+        }
+    }
+
+    @Test
+    void numberAndOffhandDeliveryChangeOnlyTheExactDestinationAndPreserveTheCursor() throws Exception {
+        for (int slot : new int[] {0, 8, 40}) {
+            var fixture = new ManualCraftPlanNativeTest.Fixture(3, 2);
+            fixture.view.setCursor(new org.bukkit.inventory.ItemStack(org.bukkit.Material.DIAMOND, 3));
+            var event = new org.bukkit.event.inventory.CraftItemEvent(new CharacterSheets().recipe(), fixture.view,
+                org.bukkit.event.inventory.InventoryType.SlotType.RESULT, 0,
+                slot == 40 ? ClickType.SWAP_OFFHAND : ClickType.NUMBER_KEY, InventoryAction.HOTBAR_SWAP,
+                slot == 40 ? -1 : slot);
+            var plan = ManualCraftPlan.capture(event).orElseThrow();
+            var record = new CharacterFactory().create(ProgressionRules.defaults());
+            try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+                var batch = storage.prepareCraft(List.of(record)).ready().join();
+                assertEquals(ManualCraftDelivery.Result.DELIVERED, ManualCraftDelivery.commit(plan, batch, fixture.view));
+                assertEquals(record.id(), new CharacterSheets().identify(fixture.inventory.getItem(slot)).orElseThrow());
+                assertEquals(1, fixture.grid.getMatrix()[0].getAmount());
+                assertEquals(org.bukkit.Material.DIAMOND, fixture.view.getCursor().getType());
+                assertEquals(3, fixture.view.getCursor().getAmount());
+            }
+        }
+    }
+
+    @Test
+    void staleInputsDestinationsRecipeCursorOrViewLeaveAllCurrentItemsAndCleanupProofUntouched() throws Exception {
+        for (int scenario = 0; scenario < 5; scenario++) {
+            var fixture = new ManualCraftPlanNativeTest.Fixture(2, 2);
+            var plan = ManualCraftPlan.capture(fixture.event(ClickType.SHIFT_LEFT,
+                InventoryAction.MOVE_TO_OTHER_INVENTORY)).orElseThrow();
+            var factory = new CharacterFactory();
+            var records = List.of(factory.create(ProgressionRules.defaults()), factory.create(ProgressionRules.defaults()));
+            try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+                var attempt = storage.prepareCraft(records);
+                var batch = attempt.ready().join();
+                if (scenario == 0) fixture.grid.getMatrix()[0].setAmount(7);
+                if (scenario == 1) fixture.inventory.setItem(8, new org.bukkit.inventory.ItemStack(org.bukkit.Material.DIAMOND));
+                if (scenario == 2) fixture.matrix.setCurrentRecipe(null);
+                if (scenario == 3) fixture.view.setCursor(new org.bukkit.inventory.ItemStack(org.bukkit.Material.GOLD_INGOT));
+                var current = scenario == 4 ? new ManualCraftPlanNativeTest.Fixture(2, 2).view : fixture.view;
+                var inputBefore = copy(fixture.grid.getMatrix());
+                var inventoryBefore = copy(fixture.inventory.getContents());
+                var cursorBefore = fixture.view.getCursor().clone();
+                fixture.menu.onChange = () -> fail("A refused craft must not recompute or mutate");
+                assertEquals(ManualCraftDelivery.Result.STALE, ManualCraftDelivery.commit(plan, batch, current));
+                assertArrayEquals(inputBefore, fixture.grid.getMatrix());
+                assertArrayEquals(inventoryBefore, fixture.inventory.getContents());
+                assertEquals(cursorBefore, fixture.view.getCursor());
+                assertEquals(2, attempt.abandon().join().removed().size());
+            }
+        }
+    }
+
+    @Test
+    void recomputationCanReenterAndChangeItemsWithoutASecondDeliveryOrLaterOverwrite() throws Exception {
+        var fixture = new ManualCraftPlanNativeTest.Fixture(2, 2);
+        var plan = ManualCraftPlan.capture(new org.bukkit.event.inventory.CraftItemEvent(new CharacterSheets().recipe(),
+            fixture.view, org.bukkit.event.inventory.InventoryType.SlotType.RESULT, 0, ClickType.NUMBER_KEY,
+            InventoryAction.HOTBAR_SWAP, 8)).orElseThrow();
+        var record = new CharacterFactory().create(ProgressionRules.defaults());
+        try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+            var attempt = storage.prepareCraft(List.of(record));
+            var batch = attempt.ready().join();
+            var changes = new AtomicInteger();
+            fixture.menu.onChange = () -> {
+                assertEquals(1, changes.incrementAndGet());
+                assertEquals(record.id(), new CharacterSheets().identify(fixture.inventory.getItem(8)).orElseThrow());
+                var repeat = ManualCraftPlan.capture(new org.bukkit.event.inventory.CraftItemEvent(new CharacterSheets().recipe(),
+                    fixture.view, org.bukkit.event.inventory.InventoryType.SlotType.RESULT, 0, ClickType.NUMBER_KEY,
+                    InventoryAction.HOTBAR_SWAP, 7)).orElseThrow();
+                assertEquals(ManualCraftDelivery.Result.UNAVAILABLE, ManualCraftDelivery.commit(repeat, batch, fixture.view));
+                assertNull(fixture.inventory.getItem(7));
+                // A post-commit listener owns these later changes; never rewrite a stored snapshot over them.
+                fixture.inventory.setItem(8, new org.bukkit.inventory.ItemStack(org.bukkit.Material.DIAMOND));
+                fixture.grid.getMatrix()[2].setAmount(22);
+            };
+            assertEquals(ManualCraftDelivery.Result.DELIVERED, ManualCraftDelivery.commit(plan, batch, fixture.view));
+            assertEquals(org.bukkit.Material.DIAMOND, fixture.inventory.getItem(8).getType());
+            assertEquals(22, fixture.grid.getMatrix()[2].getAmount());
+            assertEquals(1, changes.get());
+            assertEquals(java.util.Set.of(record.id()), attempt.abandon().join().retained());
+        }
+    }
+
+    @Test
+    void abandonedBatchAndUnsupportedWorldDropDoNotChangeInputsOrDestinations() throws Exception {
+        for (boolean drop : new boolean[] {false, true}) {
+            var fixture = new ManualCraftPlanNativeTest.Fixture(2, 1);
+            var plan = ManualCraftPlan.capture(fixture.event(drop ? ClickType.DROP : ClickType.LEFT,
+                drop ? InventoryAction.DROP_ONE_SLOT : InventoryAction.PICKUP_ALL)).orElseThrow();
+            var record = new CharacterFactory().create(ProgressionRules.defaults());
+            try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+                var attempt = storage.prepareCraft(List.of(record));
+                var batch = attempt.ready().join();
+                if (!drop) attempt.abandon();
+                assertEquals(drop ? ManualCraftDelivery.Result.UNSUPPORTED_ROUTE : ManualCraftDelivery.Result.UNAVAILABLE,
+                    ManualCraftDelivery.commit(plan, batch, fixture.view));
+                assertEquals(1, fixture.grid.getMatrix()[0].getAmount());
+                assertTrue(fixture.view.getCursor().isEmpty());
+                assertEquals(java.util.Set.of(record.id()), attempt.abandon().join().removed());
+            }
+        }
+    }
+
+    @Test
+    void aMenuChangeDuringRecomputationDoesNotWriteIntoTheNewMenusCursor() throws Exception {
+        var fixture = new ManualCraftPlanNativeTest.Fixture(2, 1);
+        var plan = ManualCraftPlan.capture(fixture.event(ClickType.RIGHT, InventoryAction.PICKUP_HALF)).orElseThrow();
+        var record = new CharacterFactory().create(ProgressionRules.defaults());
+        try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+            var batch = storage.prepareCraft(List.of(record)).ready().join();
+            fixture.menu.onChange = () -> {
+                fixture.activeMenu = new ManualCraftPlanNativeTest.Menu();
+                fixture.view.setCursor(new org.bukkit.inventory.ItemStack(org.bukkit.Material.DIAMOND));
+            };
+            assertEquals(ManualCraftDelivery.Result.DELIVERED, ManualCraftDelivery.commit(plan, batch, fixture.view));
+            assertEquals(org.bukkit.Material.DIAMOND, fixture.view.getCursor().getType());
+            assertEquals(record.id(), new CharacterSheets().identify(
+                org.bukkit.craftbukkit.inventory.CraftItemStack.asCraftMirror(fixture.menu.getCarried())).orElseThrow());
+        }
+    }
+
+    @Test
+    void anExceptionAfterRecomputationBeginsNeverAuthorizesDeletionOrInventoryRollback() throws Exception {
+        var fixture = new ManualCraftPlanNativeTest.Fixture(2, 1);
+        var plan = ManualCraftPlan.capture(fixture.event(ClickType.LEFT, InventoryAction.PICKUP_ALL)).orElseThrow();
+        var record = new CharacterFactory().create(ProgressionRules.defaults());
+        try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+            var attempt = storage.prepareCraft(List.of(record));
+            var batch = attempt.ready().join();
+            fixture.menu.onChange = () -> { throw new IllegalStateException("Simulated post-commit callback failure"); };
+            assertThrows(IllegalStateException.class, () -> ManualCraftDelivery.commit(plan, batch, fixture.view));
+            assertEquals(record.id(), new CharacterSheets().identify(fixture.view.getCursor()).orElseThrow());
+            assertTrue(fixture.grid.getMatrix()[0] == null || fixture.grid.getMatrix()[0].isEmpty());
+            assertEquals(java.util.Set.of(record.id()), attempt.abandon().join().retained());
+            assertEquals(record, storage.find(record.id()).join().orElseThrow());
+        }
+    }
+
+    private static org.bukkit.inventory.ItemStack[] copy(org.bukkit.inventory.ItemStack[] items) {
+        return java.util.Arrays.stream(items).map(item -> item == null ? null : item.clone())
+            .toArray(org.bukkit.inventory.ItemStack[]::new);
+    }
+
+    @TempDir Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test
+    void cursorCraftDebitsOneIngredientSetAndDeliversTheSavedSheetBeforeOneRecomputation() throws Exception {
+        for (int width : new int[] {2, 3}) {
+            var fixture = new ManualCraftPlanNativeTest.Fixture(width, 1);
+            var plan = ManualCraftPlan.capture(fixture.event(ClickType.LEFT, InventoryAction.PICKUP_ALL)).orElseThrow();
+            var character = new CharacterFactory().create(ProgressionRules.defaults());
+            try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+                var batch = storage.prepareCraft(List.of(character)).ready().join();
+                var changes = new AtomicInteger();
+                fixture.menu.onChange = () -> {
+                    changes.incrementAndGet();
+                    assertTrue(java.util.Arrays.stream(fixture.grid.getMatrix()).allMatch(item -> item == null || item.isEmpty()),
+                        "A prepare callback must not observe a partially debited ingredient set");
+                    assertEquals(character.id(), new CharacterSheets().identify(fixture.view.getCursor()).orElseThrow(),
+                        "The final output must exist before recomputation callbacks run");
+                };
+                assertEquals(ManualCraftDelivery.Result.DELIVERED, ManualCraftDelivery.commit(plan, batch, fixture.view));
+                assertEquals(1, changes.get());
+                assertEquals(character.id(), new CharacterSheets().identify(fixture.view.getCursor()).orElseThrow());
+                assertEquals(character, storage.find(character.id()).join().orElseThrow());
+                assertNotEquals(ManualCraftDelivery.Result.DELIVERED, ManualCraftDelivery.commit(plan, batch, fixture.view));
+                assertEquals(1, changes.get(), "Duplicate completion must not debit or notify again");
+            }
+        }
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/ManualCraftPlanNativeTest.java

@@ -0,0 +1,361 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import games.dmg.fantasystick.crafting.ManualCraftPlan;
+import games.dmg.fantasystick.items.CharacterSheets;
+import net.minecraft.world.entity.EntityEquipment;
+import net.minecraft.world.inventory.AbstractContainerMenu;
+import net.minecraft.world.inventory.ResultContainer;
+import net.minecraft.world.inventory.TransientCraftingContainer;
+import org.bukkit.Material;
+import org.bukkit.craftbukkit.inventory.CraftAbstractInventoryView;
+import org.bukkit.craftbukkit.inventory.CraftInventoryCrafting;
+import org.bukkit.craftbukkit.inventory.CraftInventoryPlayer;
+import org.bukkit.craftbukkit.inventory.CraftItemStack;
+import org.bukkit.entity.HumanEntity;
+import org.bukkit.event.inventory.ClickType;
+import org.bukkit.event.inventory.CraftItemEvent;
+import org.bukkit.event.inventory.InventoryAction;
+import org.bukkit.event.inventory.InventoryType;
+import org.bukkit.inventory.InventoryHolder;
+import org.bukkit.inventory.InventoryView;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.MenuType;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+class ManualCraftPlanNativeTest {
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test
+    void plansOneCursorSheetWithoutConsumingIngredientsOrMintingAPreviewIdentity() {
+        for (int width : new int[] {2, 3}) {
+            var fixture = new Fixture(width, 2);
+            var event = fixture.event(ClickType.LEFT, InventoryAction.PICKUP_ALL);
+            var found = ManualCraftPlan.capture(event);
+            assertTrue(found.isPresent(), "A manual result click with space must plan one character");
+            var plan = found.orElseThrow();
+            assertEquals(1, plan.quantity());
+            assertEquals(ManualCraftPlan.Route.CURSOR, plan.route());
+            assertTrue(plan.inventorySlots().isEmpty());
+            var after = plan.remainingMatrix();
+            for (int slot = 0; slot < 4; slot++) {
+                assertEquals(1, after[slot].getAmount());
+                assertEquals(2, fixture.grid.getMatrix()[slot].getAmount(), "Planning never debits live input");
+            }
+            assertTrue(new CharacterSheets().identify(fixture.grid.getResult()).isEmpty());
+            assertTrue(fixture.view.getCursor().isEmpty());
+            assertFalse(event.isCancelled(), "Planning itself does not alter event dispatch");
+        }
+    }
+
+    @Test
+    void shiftCraftingUsesDistinctEmptyStorageSlotsInNativeOrderAndStopsAtEitherLimit() {
+        for (int width : new int[] {2, 3}) {
+            for (int ingredientLimit : new int[] {3, 64}) {
+                var fixture = new Fixture(width, 64);
+                var matrix = fixture.grid.getMatrix();
+                matrix[3].setAmount(ingredientLimit);
+                fixture.grid.setMatrix(matrix);
+                for (int slot = 0; slot < 36; slot++) fixture.inventory.setItem(slot, new ItemStack(Material.COBBLESTONE, 64));
+                for (int slot : new int[] {8, 6, 35, 9}) fixture.inventory.setItem(slot, null);
+                var plan = ManualCraftPlan.capture(fixture.event(ClickType.SHIFT_LEFT,
+                    InventoryAction.MOVE_TO_OTHER_INVENTORY)).orElseThrow();
+                int count = Math.min(4, ingredientLimit);
+                assertEquals(count, plan.quantity(), "One free slot per unique sheet, bounded by ingredients");
+                assertEquals(ManualCraftPlan.Route.INVENTORY, plan.route());
+                assertEquals(java.util.List.of(8, 6, 35, 9).subList(0, count), plan.inventorySlots());
+                assertEquals(64 - count, plan.remainingMatrix()[0].getAmount());
+                if (count == ingredientLimit) assertNull(plan.remainingMatrix()[3]);
+                else assertEquals(ingredientLimit - count, plan.remainingMatrix()[3].getAmount());
+                assertEquals(64, fixture.grid.getMatrix()[0].getAmount());
+                assertNull(fixture.inventory.getItem(8), "Planning must not deliver previews");
+            }
+        }
+    }
+
+    @Test
+    void refusesCancelledNonCraftWrongRecipeAndMalformedInputWithoutChangingAnything() {
+        var fixture = new Fixture(3, 2);
+        var cancelled = fixture.event(ClickType.LEFT, InventoryAction.PICKUP_ALL);
+        cancelled.setCancelled(true);
+        assertTrue(ManualCraftPlan.capture(cancelled).isEmpty(), "Prior cancellation is authoritative");
+        assertTrue(cancelled.isCancelled());
+        for (var action : new InventoryAction[] {InventoryAction.NOTHING, InventoryAction.CLONE_STACK,
+                InventoryAction.COLLECT_TO_CURSOR, InventoryAction.PLACE_ALL, InventoryAction.SWAP_WITH_CURSOR}) {
+            assertTrue(ManualCraftPlan.capture(fixture.event(ClickType.LEFT, action)).isEmpty(), action.toString());
+        }
+        var unrelated = new org.bukkit.inventory.ShapelessRecipe(new org.bukkit.NamespacedKey("other", "character_sheet"),
+            new ItemStack(Material.PAPER)).addIngredient(Material.STICK);
+        assertTrue(ManualCraftPlan.capture(new CraftItemEvent(unrelated, fixture.view, InventoryType.SlotType.RESULT,
+            0, ClickType.LEFT, InventoryAction.PICKUP_ALL)).isEmpty());
+        assertTrue(ManualCraftPlan.capture(new CraftItemEvent(new CharacterSheets().recipe(), fixture.view,
+            InventoryType.SlotType.CRAFTING, 1, ClickType.LEFT, InventoryAction.PICKUP_ALL)).isEmpty());
+        for (ItemStack bad : new ItemStack[] {null, new ItemStack(Material.DIAMOND),
+                new ItemStack(Material.PAPER), new ItemStack(Material.STICK, 65)}) {
+            var invalid = new Fixture(3, 2);
+            var inputs = invalid.grid.getMatrix();
+            inputs[0] = bad;
+            invalid.grid.setMatrix(inputs);
+            assertTrue(ManualCraftPlan.capture(invalid.event(ClickType.LEFT, InventoryAction.PICKUP_ALL)).isEmpty());
+        }
+        var extra = fixture.grid.getMatrix();
+        extra[8] = new ItemStack(Material.PAPER);
+        fixture.grid.setMatrix(extra);
+        assertTrue(ManualCraftPlan.capture(fixture.event(ClickType.LEFT, InventoryAction.PICKUP_ALL)).isEmpty());
+        assertEquals(2, fixture.grid.getMatrix()[0].getAmount());
+        assertEquals(Material.PAPER, fixture.grid.getMatrix()[8].getType());
+    }
+
+    @Test
+    void refusesMissingResultOccupiedCursorAndFullStorageButAllowsRightClick() {
+        var fixture = new Fixture(2, 1);
+        assertEquals(1, ManualCraftPlan.capture(fixture.event(ClickType.RIGHT,
+            InventoryAction.PICKUP_HALF)).orElseThrow().quantity());
+        fixture.view.setCursor(new ItemStack(Material.PAPER));
+        assertTrue(ManualCraftPlan.capture(fixture.event(ClickType.LEFT, InventoryAction.PICKUP_ALL)).isEmpty());
+        assertEquals(Material.PAPER, fixture.view.getCursor().getType());
+        fixture.view.setCursor(null);
+        for (int slot = 0; slot < 36; slot++) fixture.inventory.setItem(slot, new ItemStack(Material.PAPER));
+        assertTrue(ManualCraftPlan.capture(fixture.event(ClickType.SHIFT_RIGHT,
+            InventoryAction.MOVE_TO_OTHER_INVENTORY)).isEmpty(), "Unique identities cannot merge with ordinary Paper");
+        fixture.grid.setResult(null);
+        assertTrue(ManualCraftPlan.capture(fixture.event(ClickType.LEFT, InventoryAction.PICKUP_ALL)).isEmpty());
+        assertEquals(1, fixture.grid.getMatrix()[0].getAmount());
+    }
+
+    @Test
+    void numberAndOffhandKeysPlanOnlyOneSheetIntoAnEmptyExactDestination() {
+        for (int slot : new int[] {0, 8, 40}) {
+            var fixture = new Fixture(3, 12);
+            var click = slot == 40 ? ClickType.SWAP_OFFHAND : ClickType.NUMBER_KEY;
+            var event = new CraftItemEvent(new CharacterSheets().recipe(), fixture.view, InventoryType.SlotType.RESULT,
+                0, click, InventoryAction.HOTBAR_SWAP, slot == 40 ? -1 : slot);
+            var plan = ManualCraftPlan.capture(event).orElseThrow();
+            assertEquals(1, plan.quantity());
+            assertEquals(ManualCraftPlan.Route.INVENTORY, plan.route());
+            assertEquals(java.util.List.of(slot), plan.inventorySlots());
+            fixture.inventory.setItem(slot, new ItemStack(Material.DIAMOND));
+            assertTrue(ManualCraftPlan.capture(event).isEmpty(), "Never displace an existing hotbar/offhand stack");
+            assertEquals(Material.DIAMOND, fixture.inventory.getItem(slot).getType());
+        }
+        var fixture = new Fixture(2, 1);
+        for (int invalid : new int[] {-1, 9, 36, 40}) {
+            assertTrue(ManualCraftPlan.capture(new CraftItemEvent(new CharacterSheets().recipe(), fixture.view,
+                InventoryType.SlotType.RESULT, 0, ClickType.NUMBER_KEY, InventoryAction.HOTBAR_SWAP, invalid)).isEmpty());
+        }
+    }
+
+    @Test
+    void distinguishesSingleDropFromControlDropBulkWithoutSpawningOrConsuming() {
+        var fixture = new Fixture(3, 5);
+        var single = ManualCraftPlan.capture(fixture.event(ClickType.DROP, InventoryAction.DROP_ONE_SLOT)).orElseThrow();
+        var bulk = ManualCraftPlan.capture(fixture.event(ClickType.CONTROL_DROP, InventoryAction.DROP_ALL_SLOT)).orElseThrow();
+        assertEquals(1, single.quantity());
+        assertEquals(5, bulk.quantity(), "Control-drop is a second native bulk route");
+        assertEquals(ManualCraftPlan.Route.DROP, single.route());
+        assertEquals(ManualCraftPlan.Route.DROP, bulk.route());
+        assertTrue(bulk.inventorySlots().isEmpty());
+        assertNull(bulk.remainingMatrix()[0]);
+        assertEquals(5, fixture.grid.getMatrix()[0].getAmount());
+        fixture.view.setCursor(new ItemStack(Material.DIAMOND));
+        assertTrue(ManualCraftPlan.capture(fixture.event(ClickType.DROP, InventoryAction.DROP_ONE_SLOT)).isEmpty());
+        assertTrue(ManualCraftPlan.capture(fixture.event(ClickType.CONTROL_DROP, InventoryAction.DROP_ALL_SLOT)).isEmpty());
+        fixture.view.setCursor(null);
+        assertTrue(ManualCraftPlan.capture(fixture.event(ClickType.MIDDLE, InventoryAction.CLONE_STACK)).isEmpty());
+        assertTrue(ManualCraftPlan.capture(fixture.event(ClickType.DOUBLE_CLICK, InventoryAction.COLLECT_TO_CURSOR)).isEmpty());
+        assertTrue(ManualCraftPlan.capture(fixture.event(ClickType.DROP, InventoryAction.DROP_ALL_SLOT)).isEmpty());
+    }
+
+    @Test
+    void snapshotsDoNotAliasNativeMirrorsAndRejectStaleInputResultCursorRecipeOrView() {
+        var fixture = new Fixture(3, 3);
+        var plan = ManualCraftPlan.capture(fixture.event(ClickType.LEFT, InventoryAction.PICKUP_ALL)).orElseThrow();
+        assertTrue(plan.matches(fixture.view));
+        plan.remainingMatrix()[0].setAmount(44);
+        assertEquals(2, plan.remainingMatrix()[0].getAmount(), "Returned arrays/stacks cannot alter the saved plan");
+        fixture.grid.getMatrix()[0].setAmount(2);
+        assertEquals(2, fixture.grid.getMatrix()[0].getAmount(), "Fixture exercises native mirrors, not fake copied stacks");
+        assertFalse(plan.matches(fixture.view), "Live amount changes invalidate an async snapshot");
+        assertEquals(2, plan.remainingMatrix()[0].getAmount());
+        for (java.util.function.Consumer<Fixture> change : java.util.List.<java.util.function.Consumer<Fixture>>of(
+                f -> { var item = f.grid.getMatrix()[0]; var meta = item.getItemMeta();
+                    meta.displayName(net.kyori.adventure.text.Component.text("Changed input")); item.setItemMeta(meta); },
+                f -> f.grid.setResult(new ItemStack(Material.PAPER)),
+                f -> f.view.setCursor(new ItemStack(Material.DIAMOND)),
+                f -> f.matrix.setCurrentRecipe(null))) {
+            var changed = new Fixture(2, 2);
+            var pending = ManualCraftPlan.capture(changed.event(ClickType.LEFT, InventoryAction.PICKUP_ALL)).orElseThrow();
+            change.accept(changed);
+            assertFalse(pending.matches(changed.view));
+            assertEquals(1, pending.remainingMatrix()[0].getAmount());
+        }
+        var other = new Fixture(3, 3);
+        assertFalse(plan.matches(other.view), "Identical contents in a different view are not the original transaction");
+    }
+
+    @Test
+    void detectsOccupiedPlannedDestinationsWithoutBlockingUnrelatedInventoryChanges() {
+        var fixture = new Fixture(3, 2);
+        var plan = ManualCraftPlan.capture(fixture.event(ClickType.SHIFT_LEFT,
+            InventoryAction.MOVE_TO_OTHER_INVENTORY)).orElseThrow();
+        assertEquals(java.util.List.of(8, 7), plan.inventorySlots());
+        fixture.inventory.setItem(12, new ItemStack(Material.DIAMOND));
+        assertTrue(plan.matches(fixture.view));
+        fixture.inventory.setItem(7, new ItemStack(Material.GOLD_INGOT));
+        assertFalse(plan.matches(fixture.view), "Sorting/new acquisitions must not be overwritten by a stale craft");
+        assertEquals(Material.GOLD_INGOT, fixture.inventory.getItem(7).getType());
+        assertThrows(UnsupportedOperationException.class, () -> plan.inventorySlots().clear());
+    }
+
+    @Test
+    void refusesAReplacedRecipeResultEvenIfItReusesTheOwnedKey() {
+        var fixture = new Fixture(2, 1);
+        var changed = new CharacterSheets().recipe().getResult();
+        changed.setAmount(2);
+        fixture.grid.setResult(changed);
+        var replaced = new org.bukkit.inventory.ShapelessRecipe(CharacterSheets.RECIPE, changed)
+            .addIngredient(Material.STICK).addIngredient(Material.PAPER)
+            .addIngredient(Material.FEATHER).addIngredient(Material.INK_SAC);
+        var event = new CraftItemEvent(replaced, fixture.view, InventoryType.SlotType.RESULT,
+            0, ClickType.LEFT, InventoryAction.PICKUP_ALL);
+        assertTrue(ManualCraftPlan.capture(event).isEmpty(), "One canonical nonplayable preview, not an arbitrary same-key result");
+        assertEquals(2, fixture.grid.getResult().getAmount());
+    }
+
+    @Test
+    void plannedBatchCanPersistAndRenderDistinctNamedSheetsWithoutApplyingInventoryChanges(
+            @org.junit.jupiter.api.io.TempDir java.nio.file.Path data) throws Exception {
+        var fixture = new Fixture(3, 4);
+        var plan = ManualCraftPlan.capture(fixture.event(ClickType.SHIFT_LEFT,
+            InventoryAction.MOVE_TO_OTHER_INVENTORY)).orElseThrow();
+        var factory = new games.dmg.fantasystick.crafting.CharacterFactory();
+        var records = java.util.stream.IntStream.range(0, plan.quantity())
+            .mapToObj(index -> factory.create(games.dmg.fantasystick.progression.ProgressionRules.defaults())).toList();
+        var repository = new games.dmg.fantasystick.persistence.YamlCharacterRepository(data);
+        try (var storage = new games.dmg.fantasystick.persistence.CharacterStorage(repository, java.time.Clock.systemUTC())) {
+            var batch = storage.prepareCraft(records).ready().join(); // Test thread, never the runtime tick thread.
+            assertTrue(plan.matches(fixture.view));
+            var saved = batch.claimForDelivery().orElseThrow();
+            var identities = new java.util.HashSet<java.util.UUID>();
+            var sheets = new CharacterSheets();
+            var ops = net.minecraft.resources.RegistryOps.create(net.minecraft.nbt.NbtOps.INSTANCE,
+                org.bukkit.craftbukkit.CraftRegistry.getMinecraftRegistry());
+            for (var record : saved) {
+                assertEquals(record, storage.find(record.id()).join().orElseThrow());
+                var sheet = sheets.create(record);
+                var encoded = net.minecraft.world.item.ItemStack.CODEC.encodeStart(ops,
+                    CraftItemStack.asNMSCopy(sheet)).getOrThrow();
+                var decoded = CraftItemStack.asBukkitCopy(net.minecraft.world.item.ItemStack.CODEC.parse(ops, encoded).getOrThrow());
+                assertTrue(identities.add(sheets.identify(decoded).orElseThrow()));
+                assertEquals(net.kyori.adventure.text.Component.text(record.name()), decoded.getItemMeta().displayName());
+                assertEquals(1, decoded.getAmount());
+                assertEquals(record, repository.load(record.id()).orElseThrow());
+            }
+            assertEquals(plan.quantity(), identities.size());
+            assertEquals(4, fixture.grid.getMatrix()[0].getAmount(), "This composition test does not commit a native craft");
+            assertNull(fixture.inventory.getItem(8));
+            assertTrue(sheets.identify(fixture.grid.getResult()).isEmpty());
+            assertTrue(batch.claimForDelivery().isEmpty());
+        }
+    }
+
+    @Test
+    void bulkDropRevalidationAcceptsOnlyTheExpectedRemainingInputsBeforeEachNextUnit() {
+        for (int width : new int[] {2, 3}) {
+            var fixture = new Fixture(width, 3);
+            var plan = ManualCraftPlan.capture(fixture.event(ClickType.CONTROL_DROP, InventoryAction.DROP_ALL_SLOT)).orElseThrow();
+            assertTrue(plan.matchesAfterDrops(fixture.view, 0));
+            for (int completed = 1; completed < 3; completed++) {
+                for (var item : fixture.grid.getMatrix()) if (item != null && !item.isEmpty()) item.setAmount(item.getAmount() - 1);
+                assertTrue(plan.matchesAfterDrops(fixture.view, completed));
+                assertFalse(plan.matchesAfterDrops(fixture.view, completed - 1));
+                assertFalse(plan.matches(fixture.view));
+            }
+            fixture.grid.getMatrix()[0].setAmount(2);
+            assertFalse(plan.matchesAfterDrops(fixture.view, 2), "Do not recapture unrelated callback changes as new authorized input");
+            assertFalse(plan.matchesAfterDrops(fixture.view, -1));
+            assertFalse(plan.matchesAfterDrops(fixture.view, 3));
+            var cursor = new Fixture(width, 3);
+            var cursorPlan = ManualCraftPlan.capture(cursor.event(ClickType.LEFT, InventoryAction.PICKUP_ALL)).orElseThrow();
+            assertFalse(cursorPlan.matchesAfterDrops(cursor.view, 0));
+        }
+    }
+
+    static final class Fixture {
+        final Menu menu = new Menu();
+        Menu activeMenu = menu;
+        final TransientCraftingContainer matrix;
+        final CraftInventoryCrafting grid;
+        final CraftInventoryPlayer inventory = new CraftInventoryPlayer(
+            new net.minecraft.world.entity.player.Inventory(null, new EntityEquipment()) {
+                @Override public InventoryHolder getOwner() { return null; }
+            });
+        final InventoryView view;
+        HumanEntity human;
+        boolean failMatrixRead;
+
+        Fixture(int width, int amount) {
+            matrix = new TransientCraftingContainer(menu, width, width);
+            var result = new ResultContainer();
+            matrix.resultInventory = result;
+            grid = new CraftInventoryCrafting(matrix, result) {
+                @Override public ItemStack[] getMatrix() {
+                    if (failMatrixRead) throw new IllegalStateException("Simulated native matrix read failure");
+                    return super.getMatrix();
+                }
+            };
+            view = new CraftAbstractInventoryView() {
+                @Override public CraftInventoryCrafting getTopInventory() { return grid; }
+                @Override public CraftInventoryPlayer getBottomInventory() { return inventory; }
+                @Override public HumanEntity getPlayer() {
+                    if (human == null) throw new AssertionError("Unexpected player/network access");
+                    return human;
+                }
+                @Override public InventoryType getType() { return grid.getType(); }
+                @Override public ItemStack getCursor() { return CraftItemStack.asCraftMirror(activeMenu.getCarried()); }
+                @Override public void setCursor(ItemStack item) { activeMenu.setCarried(CraftItemStack.asNMSCopy(item)); }
+                @Override public String getTitle() { return "Crafting fixture"; }
+                @Override public String getOriginalTitle() { return getTitle(); }
+                @Override public void setTitle(String title) { throw new AssertionError("Unexpected title change"); }
+                @Override public MenuType getMenuType() { return null; }
+            };
+            menu.view = view;
+            var contents = new ItemStack[width * width];
+            var ingredients = new Material[] {Material.STICK, Material.PAPER, Material.FEATHER, Material.INK_SAC};
+            for (int slot = 0; slot < ingredients.length; slot++) contents[slot] = new ItemStack(ingredients[slot], amount);
+            grid.setMatrix(contents);
+            grid.setResult(new CharacterSheets().recipe().getResult());
+            var nativeRecipe = new net.minecraft.world.item.crafting.ShapelessRecipe(
+                new net.minecraft.world.item.crafting.Recipe.CommonInfo(true),
+                new net.minecraft.world.item.crafting.CraftingRecipe.CraftingBookInfo(
+                    net.minecraft.world.item.crafting.CraftingBookCategory.MISC, ""),
+                net.minecraft.world.item.ItemStackTemplate.fromNonEmptyStack(CraftItemStack.asNMSCopy(grid.getResult())),
+                java.util.List.of(
+                    net.minecraft.world.item.crafting.Ingredient.of(net.minecraft.world.item.Items.STICK),
+                    net.minecraft.world.item.crafting.Ingredient.of(net.minecraft.world.item.Items.PAPER),
+                    net.minecraft.world.item.crafting.Ingredient.of(net.minecraft.world.item.Items.FEATHER),
+                    net.minecraft.world.item.crafting.Ingredient.of(net.minecraft.world.item.Items.INK_SAC)));
+            matrix.setCurrentRecipe(new net.minecraft.world.item.crafting.RecipeHolder<>(
+                net.minecraft.resources.ResourceKey.create(net.minecraft.core.registries.Registries.RECIPE,
+                    net.minecraft.resources.Identifier.parse(CharacterSheets.RECIPE.toString())), nativeRecipe));
+        }
+
+        CraftItemEvent event(ClickType click, InventoryAction action) {
+            return new CraftItemEvent(new CharacterSheets().recipe(), view, InventoryType.SlotType.RESULT, 0, click, action);
+        }
+    }
+
+    static final class Menu extends AbstractContainerMenu {
+        InventoryView view;
+        Runnable onChange = () -> { };
+        Menu() { super(null, 0); }
+        @Override public InventoryView getBukkitView() { return view; }
+        @Override public boolean stillValid(net.minecraft.world.entity.player.Player player) { return true; }
+        @Override public net.minecraft.world.item.ItemStack quickMoveStack(net.minecraft.world.entity.player.Player player, int slot) {
+            throw new AssertionError("This fixture does not execute vanilla result consumption");
+        }
+        @Override public void slotsChanged(net.minecraft.world.Container inventory) { onChange.run(); }
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/ManualCraftingControllerNativeTest.java

@@ -0,0 +1,450 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import games.dmg.fantasystick.crafting.CharacterFactory;
+import games.dmg.fantasystick.crafting.ManualCraftingController;
+import games.dmg.fantasystick.items.CharacterSheets;
+import games.dmg.fantasystick.persistence.CharacterRecord;
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import games.dmg.fantasystick.persistence.YamlCharacterRepository;
+import games.dmg.fantasystick.progression.ProgressionRules;
+import java.lang.reflect.Proxy;
+import java.nio.file.Path;
+import java.time.Clock;
+import java.util.ArrayList;
+import java.util.UUID;
+import java.util.concurrent.LinkedBlockingQueue;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.CopyOnWriteArrayList;
+import org.bukkit.entity.Player;
+import org.bukkit.event.inventory.ClickType;
+import org.bukkit.event.inventory.InventoryAction;
+import org.bukkit.inventory.InventoryView;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class ManualCraftingControllerNativeTest {
+    @TempDir Path data;
+    private final CopyOnWriteArrayList<ManualCraftingController.Failure> unexpected = new CopyOnWriteArrayList<>();
+    @org.junit.jupiter.api.AfterEach void assertNoUnexpectedDiagnostics() {
+        assertTrue(unexpected.isEmpty(), () -> "Unexpected diagnostics: " + unexpected);
+    }
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test
+    void acceptedCraftIsContainedSavedAndDeliveredOnlyOnItsDeferredServerCallbackOnce() throws Exception {
+        var actor = new Actor(2, 2);
+        var tasks = new LinkedBlockingQueue<Runnable>();
+        var allocated = new ArrayList<CharacterRecord>();
+        var failures = new CopyOnWriteArrayList<ManualCraftingController.Failure>();
+        try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC());
+             var controller = new ManualCraftingController(storage, () -> {
+                 var record = new CharacterFactory().create(ProgressionRules.defaults());
+                 allocated.add(record); return record;
+             }, tasks::add, player -> { throw new AssertionError("Not a drop craft"); }, failures::add)) {
+            var event = actor.fixture.event(ClickType.LEFT, InventoryAction.PICKUP_ALL);
+            controller.onCraft(event);
+            assertTrue(event.isCancelled(), "Vanilla must not consume the metadata-empty preview");
+            assertEquals(1, allocated.size());
+            var repeat = actor.fixture.event(ClickType.LEFT, InventoryAction.PICKUP_ALL);
+            controller.onCraft(repeat);
+            assertTrue(repeat.isCancelled());
+            assertEquals(1, allocated.size(), "The pending attempt must not allocate a second batch");
+            assertEquals(2, actor.fixture.grid.getMatrix()[0].getAmount());
+            assertTrue(actor.fixture.view.getCursor().isEmpty());
+            var complete = tasks.poll(5, TimeUnit.SECONDS);
+            assertNotNull(complete);
+            assertEquals(allocated.getFirst(), storage.find(allocated.getFirst().id()).join().orElseThrow());
+            complete.run();
+            assertEquals(1, actor.fixture.grid.getMatrix()[0].getAmount());
+            assertEquals(allocated.getFirst().id(), new CharacterSheets().identify(actor.fixture.view.getCursor()).orElseThrow());
+            assertEquals(1, actor.syncs);
+            complete.run();
+            assertEquals(1, actor.fixture.grid.getMatrix()[0].getAmount());
+            assertEquals(1, actor.syncs);
+            assertTrue(failures.isEmpty());
+        }
+    }
+
+    @Test
+    @SuppressWarnings("try") // Exercise disable during an attempt and idempotent final resource cleanup.
+    void closingDisconnectingDisablingOrChangingContextBeforeCompletionNeverConsumesOrDelivers() throws Exception {
+        for (int scenario = 0; scenario < 5; scenario++) {
+            var actor = new Actor(2, 2);
+            var tasks = new LinkedBlockingQueue<Runnable>();
+            var records = new ArrayList<CharacterRecord>();
+            try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC());
+                 var controller = new ManualCraftingController(storage, () -> {
+                     var record = new CharacterFactory().create(ProgressionRules.defaults()); records.add(record); return record;
+                 }, tasks::add, player -> { throw new AssertionError("Not a drop"); }, unexpected::add)) {
+                controller.onCraft(actor.fixture.event(ClickType.LEFT, InventoryAction.PICKUP_ALL));
+                var complete = tasks.poll(5, TimeUnit.SECONDS);
+                assertNotNull(complete);
+                if (scenario == 0) controller.onClose(new org.bukkit.event.inventory.InventoryCloseEvent(actor.fixture.view));
+                if (scenario == 1) {
+                    actor.online = false;
+                    controller.onQuit(new org.bukkit.event.player.PlayerQuitEvent(actor.player, net.kyori.adventure.text.Component.empty()));
+                }
+                if (scenario == 2) controller.close();
+                if (scenario == 3) actor.fixture.grid.getMatrix()[0].setAmount(7);
+                if (scenario == 4) actor.current = new ManualCraftPlanNativeTest.Fixture(2, 2).view;
+                complete.run();
+                assertEquals(scenario == 3 ? 7 : 2, actor.fixture.grid.getMatrix()[0].getAmount());
+                assertTrue(actor.fixture.view.getCursor().isEmpty());
+                assertTrue(actor.current.getCursor().isEmpty());
+                assertTrue(storage.find(records.getFirst().id()).join().isEmpty());
+                complete.run();
+                assertTrue(actor.fixture.view.getCursor().isEmpty());
+            }
+        }
+    }
+
+    @Test
+    void oldCallbacksCannotDeliverIntoOrRemoveANewAttemptOnTheSameReopenedMenu() throws Exception {
+        var actor = new Actor(2, 2);
+        var tasks = new LinkedBlockingQueue<Runnable>();
+        var records = new ArrayList<CharacterRecord>();
+        try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC());
+             var controller = new ManualCraftingController(storage, () -> {
+                 var record = new CharacterFactory().create(ProgressionRules.defaults()); records.add(record); return record;
+             }, tasks::add, player -> { throw new AssertionError("Not a drop"); }, unexpected::add)) {
+            controller.onCraft(actor.fixture.event(ClickType.LEFT, InventoryAction.PICKUP_ALL));
+            var old = tasks.poll(5, TimeUnit.SECONDS); assertNotNull(old);
+            controller.onClose(new org.bukkit.event.inventory.InventoryCloseEvent(actor.fixture.view));
+            controller.onCraft(actor.fixture.event(ClickType.LEFT, InventoryAction.PICKUP_ALL));
+            var fresh = tasks.poll(5, TimeUnit.SECONDS); assertNotNull(fresh);
+            old.run();
+            assertTrue(actor.fixture.view.getCursor().isEmpty());
+            controller.onCraft(actor.fixture.event(ClickType.LEFT, InventoryAction.PICKUP_ALL));
+            assertEquals(2, records.size(), "Old completion must not clear the fresh reservation");
+            fresh.run();
+            assertEquals(records.get(1).id(), new CharacterSheets().identify(actor.fixture.view.getCursor()).orElseThrow());
+            assertTrue(storage.find(records.getFirst().id()).join().isEmpty());
+            assertTrue(storage.find(records.get(1).id()).join().isPresent());
+        }
+    }
+
+    @Test
+    void qAndCtrlQUseTheSavedDropPathEvenWithFullPlayerStorage() throws Exception {
+        for (boolean bulk : new boolean[] {false, true}) {
+            var actor = new Actor(3, 3);
+            for (int slot = 0; slot < 36; slot++) actor.fixture.inventory.setItem(slot,
+                new org.bukkit.inventory.ItemStack(org.bukkit.Material.COBBLESTONE, 64));
+            var tasks = new LinkedBlockingQueue<Runnable>();
+            var records = new ArrayList<CharacterRecord>();
+            var outputs = new ArrayList<org.bukkit.inventory.ItemStack>();
+            try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC());
+                 var controller = new ManualCraftingController(storage, () -> {
+                     var record = new CharacterFactory().create(ProgressionRules.defaults()); records.add(record); return record;
+                 }, tasks::add, player -> (sheet, current) -> {
+                     assertSame(actor.player, player);
+                     assertTrue(current.getAsBoolean());
+                     outputs.add(sheet.clone());
+                     return games.dmg.fantasystick.crafting.ManualDropDelivery.Status.COMPLETE;
+                 }, unexpected::add)) {
+                var event = actor.fixture.event(bulk ? ClickType.CONTROL_DROP : ClickType.DROP,
+                    bulk ? InventoryAction.DROP_ALL_SLOT : InventoryAction.DROP_ONE_SLOT);
+                controller.onCraft(event);
+                assertTrue(event.isCancelled());
+                assertEquals(bulk ? 3 : 1, records.size());
+                assertTrue(outputs.isEmpty());
+                var complete = tasks.poll(5, TimeUnit.SECONDS); assertNotNull(complete);
+                complete.run();
+                assertEquals(bulk ? 3 : 1, outputs.size());
+                assertEquals(records.stream().map(CharacterRecord::id).toList(),
+                    outputs.stream().map(item -> new CharacterSheets().identify(item).orElseThrow()).toList());
+                var first = actor.fixture.grid.getMatrix()[0];
+                assertEquals(bulk ? 0 : 2, first == null ? 0 : first.getAmount());
+                assertEquals(64, actor.fixture.inventory.getItem(8).getAmount());
+                assertTrue(actor.fixture.view.getCursor().isEmpty());
+                assertEquals(1, actor.syncs);
+                for (var record : records) assertTrue(storage.find(record.id()).join().isPresent());
+            }
+        }
+    }
+
+    @Test
+    void deliveryAndClientSyncKeepAReservationEvenAcrossCloseReopenAndReentrantCompletion() throws Exception {
+        for (int scenario = 0; scenario < 3; scenario++) {
+            var actor = new Actor(2, 3);
+            var tasks = new LinkedBlockingQueue<Runnable>();
+            var records = new ArrayList<CharacterRecord>();
+            var failures = new CopyOnWriteArrayList<ManualCraftingController.Failure>();
+            var listener = new java.util.concurrent.atomic.AtomicReference<ManualCraftingController>();
+            var completion = new java.util.concurrent.atomic.AtomicReference<Runnable>();
+            int mode = scenario;
+            Runnable reopenAndCraft = () -> {
+                listener.get().onClose(new org.bukkit.event.inventory.InventoryCloseEvent(actor.fixture.view));
+                var again = actor.fixture.event(ClickType.DROP, InventoryAction.DROP_ONE_SLOT);
+                listener.get().onCraft(again);
+                assertTrue(again.isCancelled());
+            };
+            if (mode == 2) actor.onSync = reopenAndCraft;
+            try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC());
+                 var controller = new ManualCraftingController(storage, () -> {
+                     var record = new CharacterFactory().create(ProgressionRules.defaults()); records.add(record); return record;
+                 }, tasks::add, player -> (sheet, current) -> {
+                     if (mode == 0) completion.get().run();
+                     if (mode == 1) reopenAndCraft.run();
+                     return games.dmg.fantasystick.crafting.ManualDropDelivery.Status.COMPLETE;
+                 }, failures::add)) {
+                listener.set(controller);
+                controller.onCraft(actor.fixture.event(ClickType.DROP, InventoryAction.DROP_ONE_SLOT));
+                completion.set(tasks.poll(5, TimeUnit.SECONDS)); assertNotNull(completion.get());
+                completion.get().run();
+                assertEquals(1, records.size(), "Reentrant close must not open a second allocation window during delivery/sync");
+                assertEquals(mode == 1 ? 3 : 2, actor.fixture.grid.getMatrix()[0].getAmount());
+                assertEquals(1, actor.syncs);
+                assertEquals(mode == 1 ? java.util.List.of("drop-unconfirmed") : java.util.List.of(),
+                    failures.stream().map(ManualCraftingController.Failure::operation).toList());
+                assertTrue(tasks.isEmpty());
+            }
+        }
+    }
+
+    @Test
+    void rejectedSchedulingAbandonsUnissuedFilesWithoutWorkerPlayerAccessAndPermitsRetry() throws Exception {
+        var actor = new Actor(2, 2);
+        var tasks = new LinkedBlockingQueue<Runnable>();
+        var records = new ArrayList<CharacterRecord>();
+        var problems = new LinkedBlockingQueue<ManualCraftingController.Failure>();
+        var reject = new java.util.concurrent.atomic.AtomicBoolean(true);
+        try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC());
+             var controller = new ManualCraftingController(storage, () -> {
+                 var record = new CharacterFactory().create(ProgressionRules.defaults()); records.add(record); return record;
+             }, task -> {
+                 if (reject.getAndSet(false)) throw new java.util.concurrent.RejectedExecutionException("scheduler unavailable");
+                 tasks.add(task);
+             }, player -> { throw new AssertionError("Not a drop"); }, problems::add)) {
+            controller.onCraft(actor.fixture.event(ClickType.LEFT, InventoryAction.PICKUP_ALL));
+            var problem = problems.poll(5, TimeUnit.SECONDS);
+            assertNotNull(problem, "Scheduling rejection must not silently orphan the pending attempt");
+            assertEquals("schedule", problem.operation());
+            assertEquals(actor.id, problem.player());
+            assertEquals(java.util.List.of(records.getFirst().id()), problem.characters());
+            assertTrue(storage.find(records.getFirst().id()).join().isEmpty());
+            assertEquals(2, actor.fixture.grid.getMatrix()[0].getAmount());
+            assertTrue(actor.fixture.view.getCursor().isEmpty());
+            assertEquals(0, actor.syncs);
+            controller.onCraft(actor.fixture.event(ClickType.LEFT, InventoryAction.PICKUP_ALL));
+            var complete = tasks.poll(5, TimeUnit.SECONDS); assertNotNull(complete);
+            complete.run();
+            assertEquals(2, records.size());
+            assertEquals(records.get(1).id(), new CharacterSheets().identify(actor.fixture.view.getCursor()).orElseThrow());
+        }
+    }
+
+    @Test
+    void allocationAndSaveFailuresLeaveInventoryUnchangedAndDoNotBlockTheNextCraft() throws Exception {
+        for (boolean failAllocation : new boolean[] {true, false}) {
+            var directory = data.resolve(failAllocation ? "allocation" : "save");
+            java.nio.file.Files.createDirectories(directory);
+            if (!failAllocation) java.nio.file.Files.writeString(directory.resolve("characters"), "blocked directory fixture");
+            var actor = new Actor(2, 2);
+            var tasks = new LinkedBlockingQueue<Runnable>();
+            var records = new ArrayList<CharacterRecord>();
+            var problems = new LinkedBlockingQueue<ManualCraftingController.Failure>();
+            var firstAllocation = new java.util.concurrent.atomic.AtomicBoolean(true);
+            try (var storage = new CharacterStorage(new YamlCharacterRepository(directory), Clock.systemUTC());
+                 var controller = new ManualCraftingController(storage, () -> {
+                     if (firstAllocation.getAndSet(false) && failAllocation) throw new IllegalStateException("allocation unavailable");
+                     var record = new CharacterFactory().create(ProgressionRules.defaults()); records.add(record); return record;
+                 }, tasks::add, player -> { throw new AssertionError("Not a drop"); }, problems::add)) {
+                var event = actor.fixture.event(ClickType.LEFT, InventoryAction.PICKUP_ALL);
+                assertDoesNotThrow(() -> controller.onCraft(event));
+                assertTrue(event.isCancelled());
+                if (!failAllocation) { var failed = tasks.poll(5, TimeUnit.SECONDS); assertNotNull(failed); failed.run(); }
+                var problem = problems.poll(5, TimeUnit.SECONDS); assertNotNull(problem);
+                assertEquals(failAllocation ? "prepare" : "save", problem.operation());
+                assertEquals(2, actor.fixture.grid.getMatrix()[0].getAmount());
+                assertTrue(actor.fixture.view.getCursor().isEmpty());
+                if (!failAllocation) java.nio.file.Files.delete(directory.resolve("characters"));
+                controller.onCraft(actor.fixture.event(ClickType.LEFT, InventoryAction.PICKUP_ALL));
+                var retry = tasks.poll(5, TimeUnit.SECONDS); assertNotNull(retry); retry.run();
+                assertEquals(records.getLast().id(), new CharacterSheets().identify(actor.fixture.view.getCursor()).orElseThrow());
+                assertEquals(1, actor.fixture.grid.getMatrix()[0].getAmount());
+            }
+        }
+    }
+
+    @Test
+    void deliveryAndSyncExceptionsAreReportedWithoutReplayDeletionOrLeakingTheReservation() throws Exception {
+        for (boolean syncFailure : new boolean[] {false, true}) {
+            var actor = new Actor(2, 2);
+            var tasks = new LinkedBlockingQueue<Runnable>();
+            var records = new ArrayList<CharacterRecord>();
+            var problems = new CopyOnWriteArrayList<ManualCraftingController.Failure>();
+            if (syncFailure) actor.onSync = () -> { throw new IllegalStateException("sync failed"); };
+            try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC());
+                 var controller = new ManualCraftingController(storage, () -> {
+                     var record = new CharacterFactory().create(ProgressionRules.defaults()); records.add(record); return record;
+                 }, tasks::add, player -> (sheet, current) -> {
+                     if (!syncFailure) throw new IllegalStateException("world callback failed");
+                     return games.dmg.fantasystick.crafting.ManualDropDelivery.Status.COMPLETE;
+                 }, problems::add)) {
+                controller.onCraft(actor.fixture.event(ClickType.DROP, InventoryAction.DROP_ONE_SLOT));
+                var complete = tasks.poll(5, TimeUnit.SECONDS); assertNotNull(complete);
+                assertDoesNotThrow(complete::run);
+                assertEquals(java.util.List.of(syncFailure ? "sync" : "delivery"),
+                    problems.stream().map(ManualCraftingController.Failure::operation).toList());
+                assertTrue(storage.find(records.getFirst().id()).join().isPresent());
+                assertEquals(syncFailure ? 1 : 2, actor.fixture.grid.getMatrix()[0].getAmount());
+                complete.run();
+                assertEquals(1, problems.size());
+                actor.onSync = () -> { };
+                controller.onCraft(actor.fixture.event(ClickType.DROP, InventoryAction.DROP_ONE_SLOT));
+                assertEquals(2, records.size(), "An exception must release the reservation for a separate new intent");
+                // close() intentionally does not wait for disk work. Drain this new attempt while the
+                // store is open, before the next scenario reuses its directory or JUnit removes it.
+                var retry = tasks.poll(5, TimeUnit.SECONDS); assertNotNull(retry);
+                controller.onClose(new org.bukkit.event.inventory.InventoryCloseEvent(actor.fixture.view));
+                assertTrue(storage.find(records.getLast().id()).join().isEmpty());
+                retry.run();
+                assertEquals(1, problems.size());
+            }
+        }
+    }
+
+    @Test
+    @SuppressWarnings("try")
+    void preservesOtherRecipesAndCancellationsAndAllocatesNothingForRejectedOrStaleIntents() throws Exception {
+        var annotation = ManualCraftingController.class.getMethod("onCraft", org.bukkit.event.inventory.CraftItemEvent.class)
+            .getAnnotation(org.bukkit.event.EventHandler.class);
+        assertEquals(org.bukkit.event.EventPriority.HIGHEST, annotation.priority());
+        assertTrue(annotation.ignoreCancelled());
+        for (int scenario = 0; scenario < 7; scenario++) {
+            var actor = new Actor(2, 2);
+            var allocations = new java.util.concurrent.atomic.AtomicInteger();
+            var event = actor.fixture.event(ClickType.LEFT, InventoryAction.PICKUP_ALL);
+            if (scenario == 0) event.setCancelled(true);
+            if (scenario == 1) event = new org.bukkit.event.inventory.CraftItemEvent(new org.bukkit.inventory.ShapelessRecipe(
+                new org.bukkit.NamespacedKey("unrelated", "character_sheet"), new org.bukkit.inventory.ItemStack(org.bukkit.Material.PAPER))
+                .addIngredient(org.bukkit.Material.STICK), actor.fixture.view,
+                org.bukkit.event.inventory.InventoryType.SlotType.RESULT, 0, ClickType.LEFT, InventoryAction.PICKUP_ALL);
+            if (scenario == 2) actor.fixture.grid.setResult(new org.bukkit.inventory.ItemStack(org.bukkit.Material.DIAMOND));
+            if (scenario == 3) actor.fixture.view.setCursor(new org.bukkit.inventory.ItemStack(org.bukkit.Material.DIAMOND));
+            if (scenario == 4) actor.online = false;
+            if (scenario == 5) actor.current = new ManualCraftPlanNativeTest.Fixture(2, 2).view;
+            try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC());
+                 var controller = new ManualCraftingController(storage, () -> {
+                     allocations.incrementAndGet(); return new CharacterFactory().create(ProgressionRules.defaults());
+                 }, task -> { }, player -> { throw new AssertionError("Not a drop"); }, problem -> { })) {
+                assertEquals(0, allocations.get());
+                if (scenario == 6) controller.close();
+                controller.onCraft(event);
+                assertEquals(scenario != 1, event.isCancelled());
+                assertEquals(0, allocations.get(), "Rejected intent " + scenario + " must not mint identities");
+                assertEquals(2, actor.fixture.grid.getMatrix()[0].getAmount());
+            }
+        }
+    }
+
+    @Test
+    void acceptedOpenInvalidatesTheLifetimeButACancelledOpenDoesNotInventATransition() throws Exception {
+        for (boolean cancelled : new boolean[] {false, true}) {
+            var actor = new Actor(2, 2);
+            var tasks = new LinkedBlockingQueue<Runnable>();
+            var record = new CharacterFactory().create(ProgressionRules.defaults());
+            try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC());
+                 var controller = new ManualCraftingController(storage, () -> record, tasks::add,
+                     player -> { throw new AssertionError("Not a drop"); }, unexpected::add)) {
+                controller.onCraft(actor.fixture.event(ClickType.LEFT, InventoryAction.PICKUP_ALL));
+                var complete = tasks.poll(5, TimeUnit.SECONDS); assertNotNull(complete);
+                var open = new org.bukkit.event.inventory.InventoryOpenEvent(actor.fixture.view);
+                open.setCancelled(cancelled);
+                controller.onOpen(open);
+                complete.run();
+                assertEquals(cancelled ? 1 : 2, actor.fixture.grid.getMatrix()[0].getAmount());
+                assertEquals(cancelled, storage.find(record.id()).join().isPresent());
+                assertEquals(!cancelled, actor.fixture.view.getCursor().isEmpty());
+            }
+        }
+    }
+
+    @Test
+    void retainedUnissuedFilesAreReportedOnceWithoutDeletingEditsOrTouchingThePlayerFromTheWorker() throws Exception {
+        var actor = new Actor(2, 2);
+        var tasks = new LinkedBlockingQueue<Runnable>();
+        var problems = new LinkedBlockingQueue<ManualCraftingController.Failure>();
+        var record = new CharacterFactory().create(ProgressionRules.defaults());
+        try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC());
+             var controller = new ManualCraftingController(storage, () -> record, tasks::add,
+                 player -> { throw new AssertionError("Not a drop"); }, problems::add)) {
+            controller.onCraft(actor.fixture.event(ClickType.LEFT, InventoryAction.PICKUP_ALL));
+            var complete = tasks.poll(5, TimeUnit.SECONDS); assertNotNull(complete);
+            var file = data.resolve("characters").resolve(record.id() + ".yml");
+            java.nio.file.Files.writeString(file, "\n", java.nio.file.StandardOpenOption.APPEND);
+            var changed = java.nio.file.Files.readAllBytes(file);
+            controller.onClose(new org.bukkit.event.inventory.InventoryCloseEvent(actor.fixture.view));
+            var problem = problems.poll(5, TimeUnit.SECONDS); assertNotNull(problem);
+            assertEquals("cleanup-retained", problem.operation());
+            assertEquals(java.util.List.of(record.id()), problem.characters());
+            complete.run(); complete.run();
+            assertArrayEquals(changed, java.nio.file.Files.readAllBytes(file));
+            assertTrue(actor.fixture.view.getCursor().isEmpty());
+            assertEquals(2, actor.fixture.grid.getMatrix()[0].getAmount());
+            assertTrue(problems.isEmpty());
+        }
+    }
+
+    @Test
+    void aNativePlanningExceptionStillContainsVanillaAndReportsWithoutAllocating() throws Exception {
+        var actor = new Actor(2, 2);
+        var tasks = new LinkedBlockingQueue<Runnable>();
+        var problems = new CopyOnWriteArrayList<ManualCraftingController.Failure>();
+        var allocations = new java.util.concurrent.atomic.AtomicInteger();
+        try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC());
+             var controller = new ManualCraftingController(storage, () -> {
+                 allocations.incrementAndGet(); return new CharacterFactory().create(ProgressionRules.defaults());
+             }, tasks::add, player -> { throw new AssertionError("Not a drop"); }, problems::add)) {
+            var event = actor.fixture.event(ClickType.LEFT, InventoryAction.PICKUP_ALL);
+            actor.fixture.failMatrixRead = true;
+            assertDoesNotThrow(() -> controller.onCraft(event));
+            assertTrue(event.isCancelled(), "A planner exception must not allow vanilla to consume the plain preview");
+            assertEquals(0, allocations.get());
+            assertTrue(tasks.isEmpty());
+            assertEquals(java.util.List.of("plan"), problems.stream().map(ManualCraftingController.Failure::operation).toList());
+            actor.fixture.failMatrixRead = false;
+            assertEquals(2, actor.fixture.grid.getMatrix()[0].getAmount());
+            controller.onCraft(actor.fixture.event(ClickType.LEFT, InventoryAction.PICKUP_ALL));
+            var complete = tasks.poll(5, TimeUnit.SECONDS); assertNotNull(complete); complete.run();
+            assertEquals(1, allocations.get());
+            assertTrue(new CharacterSheets().identify(actor.fixture.view.getCursor()).isPresent());
+        }
+    }
+
+    static final class Actor {
+        final ManualCraftPlanNativeTest.Fixture fixture;
+        final UUID id = UUID.randomUUID();
+        final Player player;
+        final Thread serverThread = Thread.currentThread();
+        InventoryView current;
+        org.bukkit.Location eyeLocation;
+        boolean online = true;
+        int syncs;
+        Runnable onSync = () -> { };
+
+        Actor(int width, int amount) {
+            fixture = new ManualCraftPlanNativeTest.Fixture(width, amount);
+            current = fixture.view;
+            player = Player.class.cast(Proxy.newProxyInstance(Player.class.getClassLoader(), new Class<?>[] {Player.class},
+                (object, method, args) -> {
+                    assertSame(serverThread, Thread.currentThread(), "No native player access on the persistence worker");
+                    return switch (method.getName()) {
+                        case "getUniqueId" -> id;
+                        case "getOpenInventory" -> current;
+                        case "getEyeLocation" -> java.util.Objects.requireNonNull(eyeLocation).clone();
+                        case "isOnline" -> online;
+                        case "updateInventory" -> { syncs++; onSync.run(); yield null; }
+                        case "equals" -> object == args[0];
+                        case "hashCode" -> System.identityHashCode(object);
+                        case "toString" -> "Crafting actor fixture";
+                        default -> throw new AssertionError("Unexpected player call " + method.getName());
+                    };
+                }));
+            fixture.human = player;
+        }
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/ManualCraftingGuardNativeTest.java

@@ -0,0 +1,67 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import games.dmg.fantasystick.crafting.ManualCraftingGuard;
+import games.dmg.fantasystick.items.CharacterSheets;
+import java.lang.reflect.Proxy;
+import org.bukkit.Material;
+import org.bukkit.NamespacedKey;
+import org.bukkit.block.Block;
+import org.bukkit.event.block.CrafterCraftEvent;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.ShapelessRecipe;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+class ManualCraftingGuardNativeTest {
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    private static Block untouchedBlock() {
+        // The event boundary supplies a block, but cancellation must not access/mutate world or inventory.
+        return (Block) Proxy.newProxyInstance(Block.class.getClassLoader(), new Class<?>[]{Block.class},
+            (proxy, method, arguments) -> { throw new AssertionError("Unexpected block access: " + method.getName()); });
+    }
+
+    @Test
+    void leavesOtherRecipesAndExistingCancellationsAlone() {
+        var guard = new ManualCraftingGuard();
+        for (var key : new NamespacedKey[]{new NamespacedKey("minecraft", "paper"), new NamespacedKey("other", "character_sheet")}) {
+            var recipe = new ShapelessRecipe(key, new ItemStack(Material.PAPER)).addIngredient(Material.SUGAR_CANE);
+            for (boolean cancelled : new boolean[]{false, true}) {
+                var event = new CrafterCraftEvent(untouchedBlock(), recipe, recipe.getResult());
+                event.setCancelled(cancelled);
+                guard.onAutomatedCraft(event);
+                assertEquals(cancelled, event.isCancelled());
+                assertEquals(recipe.getResult(), event.getResult());
+            }
+        }
+        var ours = new CharacterSheets().recipe();
+        var alreadyCancelled = new CrafterCraftEvent(untouchedBlock(), ours, ours.getResult());
+        alreadyCancelled.setCancelled(true);
+        guard.onAutomatedCraft(alreadyCancelled);
+        assertTrue(alreadyCancelled.isCancelled());
+    }
+
+    @Test
+    void declaresTheNativeEventHookWithoutOverridingPriorCancellations() throws Exception {
+        var annotation = ManualCraftingGuard.class.getMethod("onAutomatedCraft", CrafterCraftEvent.class).getAnnotation(EventHandler.class);
+        assertNotNull(annotation);
+        assertEquals(EventPriority.HIGHEST, annotation.priority());
+        assertTrue(annotation.ignoreCancelled());
+    }
+
+    @Test
+    void cancelsAutomatedSheetCraftWithoutTouchingTheBlockOrResult() {
+        var recipe = new CharacterSheets().recipe();
+        var result = recipe.getResult();
+        var event = new CrafterCraftEvent(untouchedBlock(), recipe, result);
+        new ManualCraftingGuard().onAutomatedCraft(event);
+        assertTrue(event.isCancelled(), "The native Crafter must stop before consumption/ejection");
+        assertEquals(result, event.getResult());
+        assertEquals(Material.PAPER, event.getResult().getType());
+        assertTrue(new CharacterSheets().identify(event.getResult()).isEmpty());
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/ManualDropDeliveryNativeTest.java

@@ -0,0 +1,188 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import games.dmg.fantasystick.crafting.CharacterFactory;
+import games.dmg.fantasystick.crafting.ManualCraftPlan;
+import games.dmg.fantasystick.crafting.ManualDropDelivery;
+import games.dmg.fantasystick.crafting.ManualDropDelivery.Status;
+import games.dmg.fantasystick.items.CharacterSheets;
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import games.dmg.fantasystick.persistence.YamlCharacterRepository;
+import games.dmg.fantasystick.progression.ProgressionRules;
+import java.nio.file.Path;
+import java.time.Clock;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicInteger;
+import org.bukkit.event.inventory.ClickType;
+import org.bukkit.event.inventory.InventoryAction;
+import org.bukkit.inventory.ItemStack;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+/** Real matrix/item/persistence boundaries; DropTarget is the external world-insertion seam, not a live world. */
+class ManualDropDeliveryNativeTest {
+    @TempDir Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test
+    void ctrlQCompletesDistinctUnitsAndStopsAtCancellationWithoutChargingTheCancelledUnit() throws Exception {
+        for (int cancelAfter : new int[] {0, 2, 4}) {
+            var fixture = new ManualCraftPlanNativeTest.Fixture(3, 4);
+            var plan = ManualCraftPlan.capture(fixture.event(ClickType.CONTROL_DROP, InventoryAction.DROP_ALL_SLOT)).orElseThrow();
+            var factory = new CharacterFactory();
+            var records = java.util.stream.IntStream.range(0, 4).mapToObj(index -> factory.create(ProgressionRules.defaults())).toList();
+            try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+                var attempt = storage.prepareCraft(records);
+                var batch = attempt.ready().join();
+                var outputs = new ArrayList<ItemStack>();
+                var changes = new AtomicInteger();
+                var calls = new AtomicInteger();
+                fixture.menu.onChange = () -> changes.incrementAndGet();
+                var result = ManualDropDelivery.commit(plan, batch, () -> fixture.view, () -> true, (sheet, current) -> {
+                    calls.incrementAndGet();
+                    assertTrue(current.getAsBoolean());
+                    assertEquals(4 - outputs.size(), fixture.grid.getMatrix()[0].getAmount());
+                    if (outputs.size() == cancelAfter) return Status.CANCELLED;
+                    outputs.add(ItemStack.deserializeBytes(sheet.serializeAsBytes()));
+                    return Status.COMPLETE;
+                });
+                assertEquals(new ManualDropDelivery.Result(cancelAfter == 4 ? Status.COMPLETE : Status.CANCELLED, cancelAfter), result);
+                assertEquals(Math.min(4, cancelAfter + 1), calls.get());
+                assertEquals(cancelAfter, changes.get());
+                var first = fixture.grid.getMatrix()[0];
+                assertEquals(4 - cancelAfter, first == null ? 0 : first.getAmount());
+                assertEquals(records.subList(0, cancelAfter).stream().map(record -> record.id()).toList(),
+                    outputs.stream().map(item -> new CharacterSheets().identify(item).orElseThrow()).toList());
+                assertEquals(cancelAfter, outputs.stream().map(item -> new CharacterSheets().identify(item).orElseThrow()).distinct().count());
+                assertEquals(4, attempt.abandon().join().retained().size(), "Never delete records after public drop callbacks may have exposed sheets");
+            }
+        }
+    }
+
+    @Test
+    void refusedAttemptsNeverReachTheWorldOrConsumeCleanupAuthority() throws Exception {
+        for (int scenario = 0; scenario < 5; scenario++) {
+            var fixture = new ManualCraftPlanNativeTest.Fixture(2, 2);
+            var plan = ManualCraftPlan.capture(fixture.event(scenario == 4 ? ClickType.LEFT : ClickType.CONTROL_DROP,
+                scenario == 4 ? InventoryAction.PICKUP_ALL : InventoryAction.DROP_ALL_SLOT)).orElseThrow();
+            var factory = new CharacterFactory();
+            var records = java.util.stream.IntStream.range(0, scenario == 2 ? 1 : 2)
+                .mapToObj(index -> factory.create(ProgressionRules.defaults())).toList();
+            try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+                var attempt = storage.prepareCraft(records);
+                var batch = attempt.ready().join();
+                if (scenario == 0) fixture.grid.getMatrix()[0].setAmount(7);
+                if (scenario == 3) attempt.abandon();
+                boolean allowed = scenario != 1;
+                var result = ManualDropDelivery.commit(plan, batch, () -> fixture.view, () -> allowed,
+                    (sheet, current) -> { fail("A refused attempt must not reach the world"); return Status.COMPLETE; });
+                assertEquals(scenario < 2 ? Status.STALE : scenario == 4 ? Status.UNSUPPORTED_ROUTE : Status.UNAVAILABLE, result.status());
+                assertEquals(0, result.completed());
+                assertEquals(scenario == 0 ? 7 : 2, fixture.grid.getMatrix()[0].getAmount());
+                assertEquals(records.size(), attempt.abandon().join().removed().size());
+            }
+        }
+    }
+
+    @Test
+    void callbackChangesStopBulkWithoutChargingNewContentsOrRewritingTheNewCursor() throws Exception {
+        for (boolean duringSpawn : new boolean[] {true, false}) {
+            for (int mutation = 0; mutation < 4; mutation++) {
+                var fixture = new ManualCraftPlanNativeTest.Fixture(2, 3);
+                var plan = ManualCraftPlan.capture(fixture.event(ClickType.CONTROL_DROP, InventoryAction.DROP_ALL_SLOT)).orElseThrow();
+                var factory = new CharacterFactory();
+                var records = java.util.stream.IntStream.range(0, 3).mapToObj(index -> factory.create(ProgressionRules.defaults())).toList();
+                var view = new java.util.concurrent.atomic.AtomicReference<org.bukkit.inventory.InventoryView>(fixture.view);
+                var authorized = new java.util.concurrent.atomic.AtomicBoolean(true);
+                int change = mutation;
+                Runnable mutate = () -> {
+                    if (change == 0) fixture.grid.getMatrix()[0].setAmount(7);
+                    if (change == 1) fixture.view.setCursor(new ItemStack(org.bukkit.Material.DIAMOND));
+                    if (change == 2) view.set(new ManualCraftPlanNativeTest.Fixture(2, 3).view);
+                    if (change == 3) authorized.set(false); // Same-menu close/reopen is not detected by contents alone.
+                };
+                var calls = new AtomicInteger();
+                if (!duringSpawn) fixture.menu.onChange = mutate;
+                try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+                    var attempt = storage.prepareCraft(records);
+                    var result = ManualDropDelivery.commit(plan, attempt.ready().join(), view::get, authorized::get, (sheet, current) -> {
+                        assertEquals(1, calls.incrementAndGet());
+                        assertTrue(current.getAsBoolean());
+                        if (duringSpawn) mutate.run();
+                        return Status.COMPLETE;
+                    });
+                    assertEquals(new ManualDropDelivery.Result(duringSpawn ? Status.UNCONFIRMED : Status.STALE, duringSpawn ? 0 : 1), result);
+                    assertEquals(change == 0 ? 7 : duringSpawn ? 3 : 2, fixture.grid.getMatrix()[0].getAmount());
+                    if (change == 1) assertEquals(org.bukkit.Material.DIAMOND, fixture.view.getCursor().getType());
+                    assertEquals(3, attempt.abandon().join().retained().size());
+                }
+            }
+        }
+    }
+
+    @Test
+    void repeatedReentrantAndExceptionalCompletionsNeverReuseABatchOrDeletePossiblyIssuedRecords() throws Exception {
+        for (int failure : new int[] {0, 1, 2}) {
+            var fixture = new ManualCraftPlanNativeTest.Fixture(2, 2);
+            var plan = ManualCraftPlan.capture(fixture.event(ClickType.DROP, InventoryAction.DROP_ONE_SLOT)).orElseThrow();
+            var record = new CharacterFactory().create(ProgressionRules.defaults());
+            try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+                var attempt = storage.prepareCraft(List.of(record));
+                var batch = attempt.ready().join();
+                var calls = new AtomicInteger();
+                int mode = failure;
+                if (mode == 2) fixture.menu.onChange = () -> { throw new IllegalStateException("prepare failure"); };
+                ManualDropDelivery.DropTarget target = (sheet, current) -> {
+                    assertEquals(1, calls.incrementAndGet());
+                    var reentrant = ManualDropDelivery.commit(plan, batch, () -> fixture.view, () -> true,
+                        (other, valid) -> { fail("Batch replay reached world insertion"); return Status.COMPLETE; });
+                    assertEquals(Status.UNAVAILABLE, reentrant.status());
+                    if (mode == 1) throw new IllegalStateException("drop failure");
+                    return Status.COMPLETE;
+                };
+                if (mode == 0) assertEquals(Status.COMPLETE,
+                    ManualDropDelivery.commit(plan, batch, () -> fixture.view, () -> true, target).status());
+                else assertThrows(IllegalStateException.class,
+                    () -> ManualDropDelivery.commit(plan, batch, () -> fixture.view, () -> true, target));
+                assertEquals(mode == 1 ? 2 : 1, fixture.grid.getMatrix()[0].getAmount());
+                assertEquals(1, attempt.abandon().join().retained().size());
+                assertNotEquals(Status.COMPLETE, ManualDropDelivery.commit(plan, batch, () -> fixture.view, () -> true, target).status());
+                assertEquals(1, calls.get());
+            }
+        }
+    }
+
+    @Test
+    void qCraftDropsOneSavedSheetAndDebitsExactlyOneSetBeforeRecomputation() throws Exception {
+        for (int width : new int[] {2, 3}) {
+            var fixture = new ManualCraftPlanNativeTest.Fixture(width, 3);
+            var plan = ManualCraftPlan.capture(fixture.event(ClickType.DROP, InventoryAction.DROP_ONE_SLOT)).orElseThrow();
+            var record = new CharacterFactory().create(ProgressionRules.defaults());
+            try (var storage = new CharacterStorage(new YamlCharacterRepository(data), Clock.systemUTC())) {
+                var batch = storage.prepareCraft(List.of(record)).ready().join();
+                var outputs = new ArrayList<ItemStack>();
+                var changes = new AtomicInteger();
+                fixture.menu.onChange = () -> {
+                    changes.incrementAndGet();
+                    assertEquals(1, outputs.size());
+                    assertEquals(2, fixture.grid.getMatrix()[0].getAmount());
+                };
+                var result = ManualDropDelivery.commit(plan, batch, () -> fixture.view, () -> true, (sheet, current) -> {
+                    assertTrue(current.getAsBoolean());
+                    assertEquals(3, fixture.grid.getMatrix()[0].getAmount(), "Do not debit before cancellable drop callbacks");
+                    outputs.add(ItemStack.deserializeBytes(sheet.serializeAsBytes()));
+                    return Status.COMPLETE;
+                });
+                assertEquals(new ManualDropDelivery.Result(Status.COMPLETE, 1), result);
+                assertEquals(record.id(), new CharacterSheets().identify(outputs.getFirst()).orElseThrow());
+                assertEquals(record, storage.find(record.id()).join().orElseThrow());
+                assertEquals(1, changes.get());
+                assertTrue(fixture.view.getCursor().isEmpty());
+                assertNull(fixture.inventory.getItem(8));
+            }
+        }
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/NativeHealthLimitTest.java

@@ -0,0 +1,67 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import games.dmg.fantasystick.progression.CharacterProgress;
+import games.dmg.fantasystick.progression.ProgressionRules;
+import games.dmg.fantasystick.progression.Stat;
+import games.dmg.fantasystick.session.NativeHealthLimit;
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.util.UUID;
+import net.minecraft.world.entity.ai.attributes.Attributes;
+import net.minecraft.world.entity.ai.attributes.RangedAttribute;
+import org.bukkit.attribute.Attribute;
+import org.bukkit.craftbukkit.attribute.CraftAttributeInstance;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+class NativeHealthLimitTest {
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test
+    void invalidNativeRangesFailExplicitlyRatherThanGuessingOrChangingTheRuntime() {
+        var range = (RangedAttribute) Attributes.MAX_HEALTH.value();
+        double original = range.getMaxValue();
+        try {
+            for (double invalid : new double[] {0, -1, Double.NaN, Double.POSITIVE_INFINITY,
+                    Double.NEGATIVE_INFINITY, Double.MAX_VALUE, Double.MIN_VALUE}) {
+                range.maxValue = invalid;
+                assertThrows(IllegalStateException.class, NativeHealthLimit::read);
+                assertEquals(invalid, range.getMaxValue());
+            }
+        } finally { range.maxValue = original; }
+        assertEquals(0, BigDecimal.valueOf(original).compareTo(NativeHealthLimit.read()));
+    }
+
+    @Test
+    void readsTheActualNativeCeilingRatherThanGuessingTheDefaultAndFeedsCappedProgression() {
+        var range = (RangedAttribute) Attributes.MAX_HEALTH.value();
+        double original = range.getMaxValue();
+        try {
+            // Isolated non-listening test runtime only. Never write an operator's config file.
+            for (double ceiling : new double[] {10.5, 1024, 2048}) {
+                range.maxValue = ceiling;
+                BigDecimal limit = NativeHealthLimit.read();
+                assertEquals(0, BigDecimal.valueOf(ceiling).compareTo(limit));
+                assertEquals(ceiling, range.getMaxValue(), "Reading does not modify the native range");
+                var progress = new CharacterProgress(UUID.randomUUID(),
+                    new ProgressionRules(BigInteger.valueOf(3000), BigInteger.valueOf(100), 30), limit);
+                progress.recordHealth(new BigDecimal("6.25"));
+                var handle = new net.minecraft.world.entity.ai.attributes.AttributeInstance(Attributes.MAX_HEALTH, ignored -> { });
+                var attribute = new CraftAttributeInstance(handle, Attribute.MAX_HEALTH);
+                for (int index = 0; index < 2100; index++) {
+                    var before = progress.snapshot();
+                    assertEquals(CharacterProgress.Purchase.APPLIED,
+                        progress.buyStat(before.characterId(), before.revision(), Stat.CON));
+                    var after = progress.snapshot();
+                    attribute.setBaseValue(after.maximumHealth().doubleValue());
+                    assertEquals(after.maximumHealth().doubleValue(), attribute.getValue());
+                    assertEquals(0, new BigDecimal("3.75").compareTo(after.maximumHealth().subtract(after.currentHealth())));
+                }
+                assertEquals(BigInteger.valueOf(2100), progress.snapshot().stats().get(Stat.CON));
+                assertEquals(0, limit.compareTo(progress.snapshot().maximumHealth()));
+            }
+        } finally { range.maxValue = original; }
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/NativeMaximumHealthNativeTest.java

@@ -0,0 +1,57 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import games.dmg.fantasystick.session.NativeMaximumHealth;
+import net.minecraft.world.entity.ai.attributes.AttributeInstance;
+import net.minecraft.world.entity.ai.attributes.Attributes;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+class NativeMaximumHealthNativeTest {
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test void startupProbeExercisesPinnedInternalsWithoutChangingTheGlobalRangeOrOrdinaryInstances() {
+        var maximum = games.dmg.fantasystick.session.NativeHealthLimit.read();
+        var ordinary = new AttributeInstance(Attributes.MAX_HEALTH, ignored -> {});
+        double before = ordinary.getValue();
+        NativeMaximumHealth.prepare();
+        assertEquals(maximum, games.dmg.fantasystick.session.NativeHealthLimit.read());
+        assertEquals(before, ordinary.getValue()); assertTrue(ordinary.getModifiers().isEmpty());
+    }
+
+    @Test void nativePlayerHealthClampingAndClientAttributeSnapshotsUseTheLeasedMaximum() {
+        var attributes = new net.minecraft.world.entity.ai.attributes.AttributeMap(
+            net.minecraft.world.entity.ai.attributes.AttributeSupplier.builder().add(Attributes.MAX_HEALTH).build());
+        var maximum = java.util.Objects.requireNonNull(attributes.getInstance(Attributes.MAX_HEALTH));
+        var player = org.mockito.Mockito.mock(org.bukkit.craftbukkit.entity.CraftPlayer.class, org.mockito.Mockito.CALLS_REAL_METHODS);
+        var nativePlayer = org.mockito.Mockito.mock(net.minecraft.server.level.ServerPlayer.class, org.mockito.Mockito.CALLS_REAL_METHODS);
+        org.mockito.Mockito.doReturn(attributes).when(nativePlayer).getAttributes();
+        org.mockito.Mockito.doReturn(player).when(nativePlayer).getBukkitEntity();
+        org.mockito.Mockito.doReturn(nativePlayer).when(player).getHandle();
+        // Network/entity-data delivery is the boundary; run the actual native health methods.
+        org.mockito.Mockito.doNothing().when(player).updateScaledHealth();
+        org.mockito.Mockito.doNothing().when(player).updateScaledHealth(org.mockito.ArgumentMatchers.anyBoolean());
+        try (var lease = new NativeMaximumHealth(maximum, 10)) {
+            assertNotNull(lease);
+            player.setHealthScale(10);
+            nativePlayer.setHealth(100);
+            assertEquals(10, nativePlayer.getMaxHealth()); assertEquals(10, nativePlayer.getHealth());
+            nativePlayer.setHealth(6.25f); assertEquals(6.25, player.getHealth());
+            var packet = new net.minecraft.network.protocol.game.ClientboundUpdateAttributesPacket(42, java.util.List.of(player.getScaledMaxHealth()));
+            assertEquals(10, packet.getValues().getFirst().base()); assertTrue(packet.getValues().getFirst().modifiers().isEmpty());
+            assertEquals(20, maximum.getBaseValue(), "Ordinary attribute data is not replaced by the client presentation snapshot");
+        }
+        assertEquals(20, nativePlayer.getMaxHealth());
+        assertEquals(6.25, nativePlayer.getHealth(), "Removing the maximum lease does not itself heal");
+    }
+
+    @Test void failingOriginalNativeDirtyCallbackCannotLeaveAnUnownedMaximumOverride() {
+        var attribute = new AttributeInstance(Attributes.MAX_HEALTH, ignored -> { throw new IllegalStateException("Native observer failed"); });
+        assertEquals(20, attribute.getValue());
+        assertThrows(IllegalStateException.class, () -> new NativeMaximumHealth(attribute, 10));
+        assertEquals(20, attribute.getValue(), "Failed construction must not leave an unreachable effective-value lease");
+        assertThrows(IllegalStateException.class, () -> attribute.setBaseValue(24));
+        assertEquals(24, attribute.getValue(), "Subsequent legitimate native writes must not call a leaked lease");
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/NativePresentationPacketsTest.java

@@ -0,0 +1,536 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import com.google.common.collect.ImmutableMultimap;
+import com.mojang.authlib.GameProfile;
+import com.mojang.authlib.properties.Property;
+import com.mojang.authlib.properties.PropertyMap;
+import games.dmg.fantasystick.presentation.NativePresentationPackets;
+import io.netty.buffer.Unpooled;
+import java.security.KeyPairGenerator;
+import java.time.Instant;
+import java.util.EnumSet;
+import java.util.List;
+import java.util.UUID;
+import net.minecraft.network.RegistryFriendlyByteBuf;
+import net.minecraft.network.chat.Component;
+import net.minecraft.network.chat.RemoteChatSession;
+import net.minecraft.network.protocol.game.ClientboundPlayerInfoUpdatePacket;
+import net.minecraft.network.protocol.game.ClientboundPlayerInfoUpdatePacket.Action;
+import net.minecraft.network.protocol.game.ClientboundPlayerInfoUpdatePacket.Entry;
+import net.minecraft.world.entity.player.ProfilePublicKey;
+import net.minecraft.world.level.GameType;
+import org.bukkit.craftbukkit.CraftRegistry;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+class NativePresentationPacketsTest {
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    private io.papermc.paper.configuration.GlobalConfiguration previousConfig;
+
+    @org.junit.jupiter.api.BeforeEach
+    void metadataSerializationConfig() throws Exception {
+        // Pinned metadata encoding opens Paper's item-obfuscation scope even for TextDisplay.
+        // Install only this test JVM's default binding, and restore the previous global afterward.
+        previousConfig = io.papermc.paper.configuration.GlobalConfiguration.get();
+        var config = new io.papermc.paper.configuration.GlobalConfiguration();
+        config.anticheat = config.new Anticheat();
+        config.anticheat.obfuscation = config.anticheat.new Obfuscation();
+        config.anticheat.obfuscation.items = config.anticheat.obfuscation.new Items();
+        var binding = allocate(io.papermc.paper.util.sanitizer.ItemObfuscationBinding.class);
+        setField(io.papermc.paper.util.sanitizer.ItemObfuscationBinding.class, binding, "level",
+            io.papermc.paper.util.sanitizer.ItemObfuscationSession.ObfuscationLevel.OVERSIZED);
+        config.anticheat.obfuscation.items.binding = binding;
+        setField(io.papermc.paper.configuration.GlobalConfiguration.class, null, "instance", config);
+    }
+
+    @org.junit.jupiter.api.AfterEach
+    void restoreSerializationConfig() throws Exception {
+        setField(io.papermc.paper.configuration.GlobalConfiguration.class, null, "instance", previousConfig);
+    }
+
+    @Test
+    void projectsOnlyActiveDisplayNameAndPreservesEveryNativeEntryFieldThroughTheWire() throws Exception {
+        var active = entry("AccountOne", false, 217, GameType.SPECTATOR, false, 43);
+        var ordinary = entry("AccountTwo", true, 7, GameType.CREATIVE, true, 81);
+        var actions = EnumSet.allOf(Action.class);
+        var original = new ClientboundPlayerInfoUpdatePacket(actions, List.of(active, ordinary));
+        String name = "勇者 🧙🏽‍♀️ e\u0301 <red>literal</red> §a " + "長い名前".repeat(40);
+
+        var projected = NativePresentationPackets.projectPlayerInfo(original, active.profileId(), name);
+
+        assertEquals(Component.literal(name), projected.entries().getFirst().displayName(),
+            "Character names are full literal Unicode components, not account/profile replacements");
+        assertNotSame(original, projected);
+        assertEquals(actions, projected.actions());
+        assertEquals(EnumSet.allOf(Action.class), original.actions());
+        assertSame(active, original.entries().getFirst());
+        assertSame(ordinary, projected.entries().get(1));
+        assertSame(active.profile(), projected.entries().getFirst().profile());
+        assertSame(active.chatSession(), projected.entries().getFirst().chatSession());
+        assertEquals(Component.literal("Ordinary AccountOne"), active.displayName());
+
+        var decoded = roundTrip(projected);
+        assertEquals(actions, decoded.actions());
+        assertEquals(2, decoded.entries().size());
+        assertPreserved(active, decoded.entries().getFirst(), Component.literal(name));
+        assertPreserved(ordinary, decoded.entries().get(1), ordinary.displayName());
+    }
+
+    @Test
+    void attributesSuppressOnlySelectedNativeSnapshotAndNeverMutateOriginalInstances() {
+        var distance = attribute(net.minecraft.world.entity.ai.attributes.Attributes.NAME_TAG_DISTANCE, 57.25);
+        var speed = attribute(net.minecraft.world.entity.ai.attributes.Attributes.MOVEMENT_SPEED, 0.37);
+        var original = new net.minecraft.network.protocol.game.ClientboundUpdateAttributesPacket(81, List.of(speed, distance));
+        var projected = NativePresentationPackets.projectAttributes(original, 81);
+        var decoded = wire(net.minecraft.network.protocol.game.ClientboundUpdateAttributesPacket.STREAM_CODEC, projected);
+        assertNotSame(original, projected);
+        assertEquals(81, decoded.getEntityId());
+        assertEquals(2, decoded.getValues().size());
+        assertSame(original.getValues().getFirst(), projected.getValues().getFirst());
+        assertEquals(speed.getAttribute(), decoded.getValues().getFirst().attribute());
+        assertEquals(speed.getBaseValue(), decoded.getValues().getFirst().base());
+        assertEquals(speed.getModifiers(), java.util.Set.copyOf(decoded.getValues().getFirst().modifiers()));
+        assertEquals(0, decoded.getValues().get(1).base());
+        assertTrue(decoded.getValues().get(1).modifiers().isEmpty());
+        assertEquals(57.25, original.getValues().get(1).base());
+        assertEquals(3, original.getValues().get(1).modifiers().size());
+        assertEquals(57.25, distance.getBaseValue());
+        assertEquals(3, distance.getModifiers().size());
+        assertSame(original, NativePresentationPackets.projectAttributes(original, 82));
+        var absent = new net.minecraft.network.protocol.game.ClientboundUpdateAttributesPacket(81, List.of(speed));
+        assertSame(absent, NativePresentationPackets.projectAttributes(absent, 81));
+        var suppression = wire(net.minecraft.network.protocol.game.ClientboundUpdateAttributesPacket.STREAM_CODEC,
+            NativePresentationPackets.suppressNameTag(81));
+        assertEquals(81, suppression.getEntityId());
+        assertEquals(1, suppression.getValues().size());
+        assertEquals(net.minecraft.world.entity.ai.attributes.Attributes.NAME_TAG_DISTANCE, suppression.getValues().getFirst().attribute());
+        assertEquals(0, suppression.getValues().getFirst().base());
+        assertTrue(suppression.getValues().getFirst().modifiers().isEmpty());
+    }
+
+    @Test
+    void restorationSnapshotsCurrentAuthoritativeAttributeAndRefusesMissingNativeSupport() throws Exception {
+        var player = player();
+        var distance = player.distance;
+        var modifiers = java.util.Set.copyOf(distance.getModifiers());
+        var first = NativePresentationPackets.restoreNameTag(player);
+        distance.setBaseValue(13.75);
+        distance.removeModifiers();
+        var decodedFirst = wire(net.minecraft.network.protocol.game.ClientboundUpdateAttributesPacket.STREAM_CODEC, first);
+        assertEquals(player.getId(), decodedFirst.getEntityId());
+        assertEquals(1, decodedFirst.getValues().size());
+        assertEquals(57.25, decodedFirst.getValues().getFirst().base());
+        assertEquals(modifiers, java.util.Set.copyOf(decodedFirst.getValues().getFirst().modifiers()));
+        var latest = wire(net.minecraft.network.protocol.game.ClientboundUpdateAttributesPacket.STREAM_CODEC,
+            NativePresentationPackets.restoreNameTag(player));
+        assertEquals(13.75, latest.getValues().getFirst().base());
+        assertTrue(latest.getValues().getFirst().modifiers().isEmpty());
+        assertEquals(13.75, distance.getBaseValue());
+        assertTrue(distance.getModifiers().isEmpty());
+        player.distance = null;
+        assertThrows(IllegalStateException.class, () -> NativePresentationPackets.restoreNameTag(player));
+    }
+
+    @Test
+    void tabRefreshUsesCurrentOrdinaryComponentIncludingNullAndOnlyDisplayAction() throws Exception {
+        var player = player();
+        var id = player.getUUID();
+        player.ordinary = Component.literal("Ordinary 🐈").withStyle(net.minecraft.ChatFormatting.GOLD);
+        var first = NativePresentationPackets.refreshTab(player);
+        player.ordinary = Component.literal("New ordinary");
+        var decoded = roundTrip(first);
+        assertEquals(EnumSet.of(Action.UPDATE_DISPLAY_NAME), decoded.actions());
+        assertEquals(1, decoded.entries().size());
+        assertEquals(id, decoded.entries().getFirst().profileId());
+        assertEquals(Component.literal("Ordinary 🐈").withStyle(net.minecraft.ChatFormatting.GOLD), decoded.entries().getFirst().displayName());
+        assertEquals(player.ordinary, roundTrip(NativePresentationPackets.refreshTab(player)).entries().getFirst().displayName());
+        player.ordinary = null;
+        assertNull(roundTrip(NativePresentationPackets.refreshTab(player)).entries().getFirst().displayName());
+        assertEquals(id, player.getUUID());
+        assertEquals(57.25, player.distance.getBaseValue());
+        assertEquals(3, player.distance.getModifiers().size());
+    }
+
+    @Test
+    void tabProjectionNeverBroadensActionsOrChangesUnrelatedIdentities() throws Exception {
+        var active = entry("Account", true, 9, GameType.SURVIVAL, true, 8);
+        for (var action : Action.values()) {
+            var original = new ClientboundPlayerInfoUpdatePacket(EnumSet.of(action), List.of(active));
+            var projected = NativePresentationPackets.projectPlayerInfo(original, active.profileId(), "角色");
+            if (action == Action.UPDATE_DISPLAY_NAME) {
+                var expected = EnumSet.of(action, Action.UPDATE_DISPLAY_NAME);
+                assertEquals(expected, roundTrip(projected).actions());
+                assertEquals(Component.literal("角色"), roundTrip(projected).entries().getFirst().displayName());
+            } else {
+                assertSame(original, projected, action.name());
+            }
+            assertEquals(EnumSet.of(action), original.actions());
+            assertSame(original, NativePresentationPackets.projectPlayerInfo(original, UUID.randomUUID(), "Other"));
+        }
+        var empty = new ClientboundPlayerInfoUpdatePacket(EnumSet.noneOf(Action.class), List.of(active));
+        assertSame(empty, NativePresentationPackets.projectPlayerInfo(empty, active.profileId(), "Ignored"));
+    }
+
+    @Test
+    void mixedAddOnlyRetainsOriginalActionsAndEveryEntryField() throws Exception {
+        var active = entry("Account", false, 97, GameType.SPECTATOR, false, 13);
+        var unrelated = entry("Unrelated", true, 42, GameType.CREATIVE, true, 9);
+        var original = new ClientboundPlayerInfoUpdatePacket(EnumSet.of(Action.ADD_PLAYER), List.of(active, unrelated));
+        var projected = NativePresentationPackets.projectPlayerInfo(original, active.profileId(), "Character");
+        assertEquals(EnumSet.of(Action.ADD_PLAYER), roundTrip(projected).actions(),
+            "Adding UPDATE_DISPLAY_NAME would serialize the unrelated entry's currently irrelevant display component");
+        assertSame(original, projected);
+        assertEquals(List.of(active, unrelated), projected.entries());
+    }
+
+    @Test
+    void detachedLabelSpawnsWithNativeIdsAndCompleteTextDisplaySchemaForEveryViewer() throws Exception {
+        var player = player();
+        var level = level();
+        player.world = level;
+        int before = level.getNextEntityId();
+        level.chunks.rejectNext = true; // Exercise the real allocator's existing-ID collision check.
+        String text = "勇者 🧙🏽‍♀️ e\u0301 <red>literal</red> §a " + "長い名前".repeat(80);
+        var label = NativePresentationPackets.createLabel(player, text, 12.25, 89.125, -3.75);
+        assertTrue(label.id() > before + 1, "Native allocator skips an occupied ID");
+        assertEquals(3, level.chunks.checks);
+        int after = level.getNextEntityId();
+        assertTrue(after > label.id());
+        var spawn = wire(net.minecraft.network.protocol.game.ClientboundAddEntityPacket.STREAM_CODEC, label.spawn());
+        assertEquals(label.id(), spawn.getId());
+        assertEquals(label.uuid(), spawn.getUUID());
+        assertNotEquals(player.getUUID(), label.uuid());
+        assertEquals(net.minecraft.world.entity.EntityTypes.TEXT_DISPLAY, spawn.getType());
+        assertEquals(12.25, spawn.getX());
+        assertEquals(89.125, spawn.getY());
+        assertEquals(-3.75, spawn.getZ());
+        assertEquals(net.minecraft.world.phys.Vec3.ZERO, spawn.getMovement());
+        assertEquals(0, spawn.getData());
+        assertEquals(0, spawn.getXRot());
+        assertEquals(0, spawn.getYRot());
+        assertEquals(0, spawn.getYHeadRot());
+
+        var metadata = wire(net.minecraft.network.protocol.game.ClientboundSetEntityDataPacket.STREAM_CODEC, label.metadata());
+        var nextViewer = wire(net.minecraft.network.protocol.game.ClientboundSetEntityDataPacket.STREAM_CODEC, label.metadata());
+        assertEquals(label.id(), metadata.id());
+        assertEquals(metadata, nextViewer, "Metadata is a full repeatable snapshot, never packDirty");
+        var receiver = new net.minecraft.world.entity.Display.TextDisplay(net.minecraft.world.entity.EntityTypes.TEXT_DISPLAY, level);
+        assertEquals(receiver.getEntityData().packAll().size(), metadata.packedItems().size());
+        receiver.getEntityData().assignValues(metadata.packedItems());
+        assertEquals(Component.literal(text), receiver.getText());
+        assertEquals(net.minecraft.world.entity.Display.BillboardConstraints.CENTER, receiver.getBillboardConstraints());
+        assertEquals(Integer.MAX_VALUE, receiver.getLineWidth());
+        assertEquals((byte) -1, receiver.getTextOpacity());
+        assertEquals(net.minecraft.world.entity.Display.TextDisplay.FLAG_SHADOW
+            | net.minecraft.world.entity.Display.TextDisplay.FLAG_USE_DEFAULT_BACKGROUND, receiver.getFlags());
+        assertEquals(0, receiver.getFlags() & net.minecraft.world.entity.Display.TextDisplay.FLAG_SEE_THROUGH);
+        assertTrue(receiver.isNoGravity());
+        assertEquals(0, receiver.getShadowRadius());
+        assertEquals(0, receiver.getWidth());
+        assertEquals(0, receiver.getHeight());
+        assertEquals(57.25, player.distance.getBaseValue());
+        assertEquals(3, player.distance.getModifiers().size());
+
+        // White-box safety invariant only: the opaque session handle cannot expose/register this entity.
+        var field = label.getClass().getDeclaredField("display");
+        field.setAccessible(true);
+        var detached = (net.minecraft.world.entity.Display.TextDisplay) field.get(label);
+        assertFalse(detached.persist);
+        assertFalse(detached.valid);
+        assertFalse(detached.isRemoved());
+        assertSame(level, detached.level());
+    }
+
+    @Test
+    void labelMoveRenameAndRemoveSerializeWithoutChangingIdentityOrAuthoritativeState() throws Exception {
+        var player = player();
+        player.world = level();
+        var label = NativePresentationPackets.createLabel(player, "Old", 1, 2, 3);
+        var other = NativePresentationPackets.createLabel(player, "Other", 4, 5, 6);
+        assertNotEquals(label.id(), other.id());
+        assertNotEquals(label.uuid(), other.uuid());
+        var id = label.id();
+        var uuid = label.uuid();
+        int allocated = player.world.chunks.checks;
+        var originalMetadata = label.metadata();
+        var move = wire(net.minecraft.network.protocol.game.ClientboundTeleportEntityPacket.STREAM_CODEC,
+            label.move(-17.625, 193.125, 4.5));
+        assertEquals(id, move.id());
+        assertEquals(new net.minecraft.world.phys.Vec3(-17.625, 193.125, 4.5), move.change().position());
+        assertEquals(net.minecraft.world.phys.Vec3.ZERO, move.change().deltaMovement());
+        assertEquals(0, move.change().xRot());
+        assertEquals(0, move.change().yRot());
+        assertTrue(move.relatives().isEmpty());
+        assertFalse(move.onGround());
+        var lateSpawn = wire(net.minecraft.network.protocol.game.ClientboundAddEntityPacket.STREAM_CODEC, label.spawn());
+        assertEquals(-17.625, lateSpawn.getX());
+        assertEquals(193.125, lateSpawn.getY());
+        assertEquals(4.5, lateSpawn.getZ());
+        String name = "改名 🌈 e\u0301 <bold>literal</bold>";
+        var renamed = wire(net.minecraft.network.protocol.game.ClientboundSetEntityDataPacket.STREAM_CODEC, label.rename(name));
+        assertEquals(id, renamed.id());
+        assertEquals(renamed, wire(net.minecraft.network.protocol.game.ClientboundSetEntityDataPacket.STREAM_CODEC, label.metadata()));
+        var changed = new java.util.ArrayList<net.minecraft.network.syncher.SynchedEntityData.DataValue<?>>();
+        for (int index = 0; index < renamed.packedItems().size(); index++) {
+            var value = renamed.packedItems().get(index);
+            if (!value.equals(originalMetadata.packedItems().get(index))) { changed.add(value); }
+        }
+        assertEquals(1, changed.size(), "Rename changes only literal text, not any other native field");
+        assertSame(net.minecraft.network.syncher.EntityDataSerializers.COMPONENT, changed.getFirst().serializer());
+        assertEquals(Component.literal(name), changed.getFirst().value());
+        assertEquals(Component.literal("Old"), originalMetadata.packedItems().stream()
+            .filter(value -> value.id() == changed.getFirst().id()).findFirst().orElseThrow().value());
+        var removal = wire(net.minecraft.network.protocol.game.ClientboundRemoveEntitiesPacket.STREAM_CODEC, label.remove());
+        assertArrayEquals(new int[] {id}, removal.getEntityIds().toIntArray());
+        assertArrayEquals(new int[] {id}, label.remove().getEntityIds().toIntArray());
+        assertEquals(id, label.id());
+        assertEquals(uuid, label.uuid());
+        assertEquals(allocated, player.world.chunks.checks, "Updates and removals never allocate replacement IDs");
+        assertEquals(4, other.spawn().getX());
+        assertEquals(5, other.spawn().getY());
+        assertEquals(6, other.spawn().getZ());
+        assertEquals(57.25, player.distance.getBaseValue());
+        assertEquals(3, player.distance.getModifiers().size());
+        var field = label.getClass().getDeclaredField("display");
+        field.setAccessible(true);
+        var detached = (net.minecraft.world.entity.Display.TextDisplay) field.get(label);
+        assertFalse(detached.persist);
+        assertFalse(detached.valid);
+        assertFalse(detached.isRemoved(), "Client removal must not invoke native discard/remove");
+    }
+
+    @Test
+    void invalidLabelInputsFailBeforeAllocationOrMutationAndMissingWorldIsUnsupported() throws Exception {
+        var player = player();
+        player.world = level();
+        assertThrows(IllegalArgumentException.class,
+            () -> NativePresentationPackets.createLabel(player, "Name", Double.NaN, 1, 2));
+        assertThrows(IllegalArgumentException.class,
+            () -> NativePresentationPackets.createLabel(player, "Name", 1, Double.POSITIVE_INFINITY, 2));
+        assertThrows(IllegalArgumentException.class,
+            () -> NativePresentationPackets.createLabel(player, "Name", 1, 2, Double.NEGATIVE_INFINITY));
+        assertThrows(IllegalArgumentException.class,
+            () -> NativePresentationPackets.createLabel(player, null, 1, 2, 3));
+        assertEquals(0, player.world.chunks.checks);
+        var label = NativePresentationPackets.createLabel(player, "Unchanged", 1, 2, 3);
+        var metadata = label.metadata();
+        assertThrows(IllegalArgumentException.class, () -> label.move(Double.NaN, 6, 7));
+        assertThrows(IllegalArgumentException.class, () -> label.move(5, Double.NEGATIVE_INFINITY, 7));
+        assertThrows(IllegalArgumentException.class, () -> label.move(5, 6, Double.POSITIVE_INFINITY));
+        assertThrows(IllegalArgumentException.class, () -> label.rename(null));
+        assertEquals(metadata, label.metadata());
+        assertEquals(1, label.spawn().getX());
+        assertEquals(2, label.spawn().getY());
+        assertEquals(3, label.spawn().getZ());
+        assertEquals(1, player.world.chunks.checks);
+        player.world = null;
+        assertThrows(IllegalStateException.class,
+            () -> NativePresentationPackets.createLabel(player, "Name", 1, 2, 3));
+        assertDoesNotThrow(() -> wire(net.minecraft.network.protocol.game.ClientboundSetEntityDataPacket.STREAM_CODEC,
+            label.rename("")), "Empty literal text is valid; it is not an account-name restriction");
+    }
+
+    @Test
+    void allPresentationOperationsPreserveNativeAccountUuidTeamAndInventoryAcrossWorldChange() throws Exception {
+        var player = player();
+        player.world = level();
+        var oldLevel = player.world;
+        var id = player.getUUID();
+        var entityId = player.getId();
+        var profile = player.getGameProfile();
+        var team = player.board.addPlayerTeam("ordinary-team");
+        team.setPlayerPrefix(Component.literal("[Ordinary]"));
+        team.setNameTagVisibility(net.minecraft.world.scores.Team.Visibility.HIDE_FOR_OTHER_TEAMS);
+        player.board.addPlayerToTeam(profile.name(), team);
+        var members = java.util.Set.copyOf(team.getPlayers());
+        var prefix = team.getPlayerPrefix().copy();
+        var stack = new net.minecraft.world.item.ItemStack(net.minecraft.world.item.Items.DIAMOND, 23);
+        stack.set(net.minecraft.core.component.DataComponents.CUSTOM_NAME, Component.literal("Do not change 🐈"));
+        player.getInventory().getNonEquipmentItems().set(17, stack);
+        var savedStack = stack.copy();
+        var modifiers = java.util.Set.copyOf(player.distance.getModifiers());
+        player.ordinary = Component.literal("Ordinary Tab");
+        var label = NativePresentationPackets.createLabel(player, "Character", 1, 2, 3);
+        wire(net.minecraft.network.protocol.game.ClientboundAddEntityPacket.STREAM_CODEC, label.spawn());
+        wire(net.minecraft.network.protocol.game.ClientboundSetEntityDataPacket.STREAM_CODEC, label.metadata());
+        wire(net.minecraft.network.protocol.game.ClientboundUpdateAttributesPacket.STREAM_CODEC,
+            NativePresentationPackets.suppressNameTag(entityId));
+        var info = new ClientboundPlayerInfoUpdatePacket(EnumSet.of(Action.ADD_PLAYER), List.of(
+            new Entry(id, profile, true, 51, GameType.CREATIVE, player.ordinary, true, 11, null)));
+        roundTrip(NativePresentationPackets.projectPlayerInfo(info, id, "Character"));
+        player.world = level();
+        int oldAllocations = oldLevel.chunks.checks;
+        wire(net.minecraft.network.protocol.game.ClientboundTeleportEntityPacket.STREAM_CODEC, label.move(4, 5, 6));
+        wire(net.minecraft.network.protocol.game.ClientboundSetEntityDataPacket.STREAM_CODEC, label.rename("New character"));
+        wire(net.minecraft.network.protocol.game.ClientboundRemoveEntitiesPacket.STREAM_CODEC, label.remove());
+        wire(net.minecraft.network.protocol.game.ClientboundUpdateAttributesPacket.STREAM_CODEC,
+            NativePresentationPackets.restoreNameTag(player));
+        roundTrip(NativePresentationPackets.refreshTab(player));
+        assertEquals(oldAllocations, oldLevel.chunks.checks);
+        assertEquals(0, player.world.chunks.checks, "Updating an old handle never silently creates a new-world entity");
+        assertEquals(id, player.getUUID());
+        assertEquals(entityId, player.getId());
+        assertSame(profile, player.getGameProfile());
+        assertEquals("Account", player.getGameProfile().name());
+        assertEquals("skin-payload", player.getGameProfile().properties().get("textures").iterator().next().value());
+        assertSame(team, player.getTeam());
+        assertEquals(members, java.util.Set.copyOf(team.getPlayers()));
+        assertEquals(prefix, team.getPlayerPrefix());
+        assertEquals(net.minecraft.world.scores.Team.Visibility.HIDE_FOR_OTHER_TEAMS, team.getNameTagVisibility());
+        assertEquals(1, player.board.getPlayerTeams().size());
+        assertSame(stack, player.getInventory().getNonEquipmentItems().get(17));
+        assertTrue(net.minecraft.world.item.ItemStack.matches(savedStack, stack));
+        assertEquals(57.25, player.distance.getBaseValue());
+        assertEquals(modifiers, player.distance.getModifiers());
+        assertEquals(Component.literal("Ordinary Tab"), player.getTabListDisplayName());
+    }
+
+    /** The real ServerLevel ID allocator runs against an explicit tracking-index read port. */
+    private static final class ReadChunks extends net.minecraft.server.level.ServerChunkCache {
+        private int checks;
+        private boolean rejectNext;
+        private ReadChunks() { super(null, null, null, null, null, null, 0, 0, false, null, null, null); }
+        @Override public boolean hasEntityWithId(int id) {
+            checks++;
+            boolean reject = rejectNext;
+            rejectNext = false;
+            return reject;
+        }
+    }
+
+    private static final class ReadLevel extends net.minecraft.server.level.ServerLevel {
+        private io.papermc.paper.configuration.WorldConfiguration config;
+        private ReadChunks chunks;
+        private ReadLevel() { super(null, null, null, null, null, null, false, 0, null, false, null, null, null, null, null, null); }
+        @Override public io.papermc.paper.configuration.WorldConfiguration paperConfig() { return config; }
+        @Override public boolean addFreshEntity(net.minecraft.world.entity.Entity entity) { throw new AssertionError("Never insert a label"); }
+        @Override public boolean addFreshEntity(net.minecraft.world.entity.Entity entity, org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason reason) {
+            throw new AssertionError("Never insert a label");
+        }
+    }
+
+    private static ReadLevel level() throws Exception {
+        var level = allocate(ReadLevel.class);
+        level.chunks = allocate(ReadChunks.class);
+        setField(net.minecraft.server.level.ServerLevel.class, level, "chunkSource", level.chunks);
+        setField(net.minecraft.world.level.Level.class, level, "spigotConfig", allocate(org.spigotmc.SpigotWorldConfig.class));
+        var purpur = allocate(org.purpurmc.purpur.PurpurWorldConfig.class);
+        purpur.drowningAirTicks = 300;
+        setField(net.minecraft.world.level.Level.class, level, "purpurConfig", purpur);
+        level.config = allocate(io.papermc.paper.configuration.WorldConfiguration.class);
+        level.config.entities = allocate(io.papermc.paper.configuration.WorldConfiguration.Entities.class);
+        level.config.entities.spawning = allocate(io.papermc.paper.configuration.WorldConfiguration.Entities.Spawning.class);
+        level.config.entities.spawning.despawnTime = new it.unimi.dsi.fastutil.objects.Reference2ObjectOpenHashMap<>();
+        return level;
+    }
+
+    private static void setField(Class<?> owner, Object target, String name, Object value) throws Exception {
+        var field = owner.getDeclaredField(name);
+        field.setAccessible(true);
+        field.set(target, value);
+    }
+
+    /** Constructor-free read boundary. Native attributes and packet codecs are real. */
+    private static final class ReadPlayer extends net.minecraft.server.level.ServerPlayer {
+        private net.minecraft.world.entity.ai.attributes.AttributeInstance distance;
+        private Component ordinary;
+        private net.minecraft.world.scores.Scoreboard board;
+        private ReadLevel world;
+        @Override public net.minecraft.server.level.ServerLevel level() { return world; }
+        private ReadPlayer() { super(null, null, null, null); throw new AssertionError("Never construct a server player"); }
+        @Override public Component getTabListDisplayName() { return ordinary; }
+        @Override public net.minecraft.world.scores.PlayerTeam getTeam() { return board.getPlayersTeam(getScoreboardName()); }
+        @Override public net.minecraft.world.entity.ai.attributes.AttributeInstance getAttribute(
+                net.minecraft.core.Holder<net.minecraft.world.entity.ai.attributes.Attribute> type) {
+            assertEquals(net.minecraft.world.entity.ai.attributes.Attributes.NAME_TAG_DISTANCE, type);
+            return distance;
+        }
+    }
+
+    private static ReadPlayer player() throws Exception {
+        var player = allocate(ReadPlayer.class);
+        player.setId(93);
+        player.setUUID(UUID.randomUUID());
+        player.gameProfile = new GameProfile(player.getUUID(), "Account", new PropertyMap(ImmutableMultimap.of("textures",
+            new Property("textures", "skin-payload", "skin-signature"))));
+        player.board = new net.minecraft.world.scores.Scoreboard();
+        setField(net.minecraft.world.entity.player.Player.class, player, "inventory",
+            new net.minecraft.world.entity.player.Inventory(player, new net.minecraft.world.entity.EntityEquipment()));
+        player.distance = attribute(net.minecraft.world.entity.ai.attributes.Attributes.NAME_TAG_DISTANCE, 57.25);
+        return player;
+    }
+
+    private static <T> T allocate(Class<T> type) throws Exception {
+        var unsafe = Class.forName("sun.misc.Unsafe");
+        var field = unsafe.getDeclaredField("theUnsafe");
+        field.setAccessible(true);
+        return type.cast(unsafe.getMethod("allocateInstance", Class.class).invoke(field.get(null), type));
+    }
+
+    private static net.minecraft.world.entity.ai.attributes.AttributeInstance attribute(
+            net.minecraft.core.Holder<net.minecraft.world.entity.ai.attributes.Attribute> type, double base) {
+        var instance = new net.minecraft.world.entity.ai.attributes.AttributeInstance(type, ignored -> { });
+        instance.setBaseValue(base);
+        for (var operation : net.minecraft.world.entity.ai.attributes.AttributeModifier.Operation.values()) {
+            instance.addTransientModifier(new net.minecraft.world.entity.ai.attributes.AttributeModifier(
+                net.minecraft.resources.Identifier.fromNamespaceAndPath("test", operation.name().toLowerCase(java.util.Locale.ROOT)),
+                0.25, operation));
+        }
+        return instance;
+    }
+
+    private static <T> T wire(net.minecraft.network.codec.StreamCodec<? super RegistryFriendlyByteBuf, T> codec, T packet) {
+        var buffer = new RegistryFriendlyByteBuf(Unpooled.buffer(), CraftRegistry.getMinecraftRegistry());
+        try {
+            codec.encode(buffer, packet);
+            T decoded = codec.decode(buffer);
+            assertFalse(buffer.isReadable(), "The actual pinned schema consumes every byte");
+            return decoded;
+        } finally { buffer.release(); }
+    }
+
+    private static Entry entry(String account, boolean listed, int latency, GameType gameMode,
+                               boolean hat, int order) throws Exception {
+        UUID id = UUID.randomUUID();
+        var profile = new GameProfile(id, account, new PropertyMap(ImmutableMultimap.of("textures",
+            new Property("textures", "skin-payload-" + account, "skin-signature-" + account))));
+        var keyGenerator = KeyPairGenerator.getInstance("RSA");
+        keyGenerator.initialize(2048);
+        var key = new ProfilePublicKey.Data(Instant.ofEpochSecond(2_000_000_000L),
+            keyGenerator.generateKeyPair().getPublic(), new byte[] {1, 3, 7, 9});
+        return new Entry(id, profile, listed, latency, gameMode, Component.literal("Ordinary " + account),
+            hat, order, new RemoteChatSession.Data(UUID.randomUUID(), key));
+    }
+
+    private static void assertPreserved(Entry before, Entry after, Component expectedDisplay) {
+        assertEquals(before.profileId(), after.profileId());
+        assertEquals(before.profile().id(), after.profile().id());
+        assertEquals(before.profile().name(), after.profile().name());
+        assertEquals(before.profile().properties(), after.profile().properties());
+        assertEquals(before.listed(), after.listed());
+        assertEquals(before.latency(), after.latency());
+        assertEquals(before.gameMode(), after.gameMode());
+        assertEquals(expectedDisplay, after.displayName());
+        assertEquals(before.showHat(), after.showHat());
+        assertEquals(before.listOrder(), after.listOrder());
+        assertEquals(before.chatSession().sessionId(), after.chatSession().sessionId());
+        var beforeKey = before.chatSession().profilePublicKey();
+        var afterKey = after.chatSession().profilePublicKey();
+        assertEquals(beforeKey.expiresAt(), afterKey.expiresAt());
+        assertEquals(beforeKey.key(), afterKey.key());
+        assertArrayEquals(beforeKey.keySignature(), afterKey.keySignature());
+    }
+
+    private static ClientboundPlayerInfoUpdatePacket roundTrip(ClientboundPlayerInfoUpdatePacket packet) {
+        var buffer = new RegistryFriendlyByteBuf(Unpooled.buffer(), CraftRegistry.getMinecraftRegistry());
+        try {
+            ClientboundPlayerInfoUpdatePacket.STREAM_CODEC.encode(buffer, packet);
+            var decoded = ClientboundPlayerInfoUpdatePacket.STREAM_CODEC.decode(buffer);
+            assertFalse(buffer.isReadable(), "The actual pinned packet schema consumes every byte");
+            return decoded;
+        } finally { buffer.release(); }
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/NutritionNativeTest.java

@@ -0,0 +1,121 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.nio.file.Path;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class NutritionNativeTest {
+    @TempDir Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test void exitEatingAndReentryCannotHealTheSavedCharacterOrLoseTheNewOrdinaryNutrition() throws Exception {
+        java.nio.file.Files.writeString(data.resolve("config.yml"), "character-swap-cooldown-seconds: 0\n");
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player);
+            a.player.setHealth(12); a.player.setFoodLevel(7); a.player.setSaturation(2); a.player.setExhaustion(3);
+            f.activate(a); a.player.setHealth(4);
+            var sheet = a.core.inventory.getItemInOffHand().clone();
+            a.core.inventory.setItemInOffHand(null); f.changed(a); f.awaitCharacterAndReceipt(a);
+            assertEquals(12, a.player.getHealth()); assertEquals(7, a.player.getFoodLevel());
+            a.player.setHealth(a.maximumHealth.getValue());
+            a.player.setFoodLevel(20); a.player.setSaturation(12); a.player.setExhaustion(0.5f);
+            a.core.inventory.setItemInOffHand(sheet); f.activate(a);
+            assertEquals(4, a.player.getHealth(), "Ordinary eating/healing cannot refill transferable fantasy health");
+            assertEquals(20, a.player.getFoodLevel()); assertEquals(0, a.player.getExhaustion());
+            a.core.inventory.setItemInOffHand(null); f.changed(a); f.awaitCharacterAndReceipt(a);
+            assertEquals(a.maximumHealth.getValue(), a.player.getHealth());
+            assertEquals(20, a.player.getFoodLevel()); assertEquals(12, a.player.getSaturation());
+            assertEquals(0.5f, a.player.getExhaustion());
+            var characters = (games.dmg.fantasystick.persistence.CharacterStorage)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            assertEquals(0, characters.find(a.core.record.id()).get(5, java.util.concurrent.TimeUnit.SECONDS)
+                .orElseThrow().health().compareTo(java.math.BigDecimal.valueOf(4)));
+        }
+    }
+
+    @Test void failedFantasyFoodSetterRestoresTheCapturedOrdinaryNutritionAndRetainsRecoveryProof() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player);
+            a.player.setFoodLevel(7); a.player.setSaturation(2); a.player.setExhaustion(3);
+            a.foodMutation = () -> {
+                a.foodMutation = () -> {};
+                throw new IllegalStateException("Injected food setter failure");
+            };
+            f.activate(a);
+            var sessions = (games.dmg.fantasystick.session.EquipmentSessions)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "sessions");
+            assertTrue(sessions.active(a.core.id).isEmpty());
+            assertEquals(7, a.player.getFoodLevel()); assertEquals(2, a.player.getSaturation());
+            assertEquals(3, a.player.getExhaustion());
+            assertNotNull(f.receipts().find(a.core.id).toCompletableFuture().get(5, java.util.concurrent.TimeUnit.SECONDS)
+                .orElseThrow().pending());
+        }
+    }
+
+    @Test void fantasyDefeatRestoresOrdinaryNutritionInsteadOfLeavingTheFullFantasyState() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player);
+            a.player.setFoodLevel(7); a.player.setSaturation(2); a.player.setExhaustion(3);
+            f.activate(a);
+            assertEquals(20, a.player.getFoodLevel()); assertEquals(0, a.player.getExhaustion());
+            var source = new org.bukkit.craftbukkit.damage.CraftDamageSource(new net.minecraft.world.damagesource.DamageSource(
+                org.bukkit.craftbukkit.damage.CraftDamageType.bukkitToMinecraftHolder(org.bukkit.damage.DamageType.OUT_OF_WORLD)));
+            var death = new org.bukkit.event.entity.PlayerDeathEvent(a.player, source, new java.util.ArrayList<>(), 0,
+                net.kyori.adventure.text.Component.empty(), true);
+            f.dispatcher.accept(death); PartyBookNativeTest.drain(f);
+            assertTrue(death.isCancelled());
+            assertEquals(7, a.player.getFoodLevel()); assertEquals(2, a.player.getSaturation());
+            assertEquals(3, a.player.getExhaustion());
+        }
+    }
+
+    @Test void activeFantasyModeKeepsFoodFullBlocksFoodHealingAndRestoresOrdinaryNutrition() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            var ordinary = new FantasyStickLifecycleNativeTest.Actor(data);
+            ordinary.core.inventory.setItemInOffHand(null);
+            f.players.put(a.core.id, a.player); f.players.put(ordinary.core.id, ordinary.player);
+            a.player.setFoodLevel(7); a.player.setSaturation(2); a.player.setExhaustion(3);
+            ordinary.player.setFoodLevel(8); ordinary.player.setExhaustion(4);
+            f.activate(a);
+            assertEquals(20, a.player.getFoodLevel()); assertEquals(0, a.player.getExhaustion());
+
+            var drain = new org.bukkit.event.entity.FoodLevelChangeEvent(a.player, 19);
+            var exhaustion = new org.bukkit.event.entity.EntityExhaustionEvent(a.player,
+                org.bukkit.event.entity.EntityExhaustionEvent.ExhaustionReason.SPRINT, 0.1f);
+            var foodHealing = new org.bukkit.event.entity.EntityRegainHealthEvent(a.player, 1,
+                org.bukkit.event.entity.EntityRegainHealthEvent.RegainReason.SATIATED);
+            var potionHealing = new org.bukkit.event.entity.EntityRegainHealthEvent(a.player, 1,
+                org.bukkit.event.entity.EntityRegainHealthEvent.RegainReason.MAGIC);
+            var abilityHealing = new org.bukkit.event.entity.EntityRegainHealthEvent(a.player, 1,
+                org.bukkit.event.entity.EntityRegainHealthEvent.RegainReason.CUSTOM);
+            f.dispatcher.accept(drain); f.dispatcher.accept(exhaustion);
+            f.dispatcher.accept(foodHealing); f.dispatcher.accept(potionHealing); f.dispatcher.accept(abilityHealing);
+            assertTrue(drain.isCancelled()); assertTrue(exhaustion.isCancelled()); assertTrue(foodHealing.isCancelled());
+            assertFalse(potionHealing.isCancelled(), "Explicit native magic healing remains available");
+            assertFalse(abilityHealing.isCancelled(), "Explicit ability healing remains available");
+            assertEquals(20, a.player.getFoodLevel()); assertEquals(0, a.player.getExhaustion());
+
+            var ordinaryDrain = new org.bukkit.event.entity.FoodLevelChangeEvent(ordinary.player, 7);
+            var ordinaryHealing = new org.bukkit.event.entity.EntityRegainHealthEvent(ordinary.player, 1,
+                org.bukkit.event.entity.EntityRegainHealthEvent.RegainReason.SATIATED);
+            f.dispatcher.accept(ordinaryDrain); f.dispatcher.accept(ordinaryHealing);
+            assertFalse(ordinaryDrain.isCancelled()); assertFalse(ordinaryHealing.isCancelled());
+            assertEquals(8, ordinary.player.getFoodLevel()); assertEquals(4, ordinary.player.getExhaustion());
+
+            a.core.inventory.setItemInOffHand(null); f.changed(a); f.awaitCharacterAndReceipt(a);
+            assertEquals(7, a.player.getFoodLevel()); assertEquals(2, a.player.getSaturation());
+            assertEquals(3, a.player.getExhaustion());
+        }
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/PartyBookNativeTest.java

@@ -0,0 +1,294 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import java.nio.file.Path;
+import java.util.UUID;
+import java.util.concurrent.TimeUnit;
+import org.bukkit.block.BlockFace;
+import org.bukkit.event.block.Action;
+import org.bukkit.event.player.PlayerInteractEvent;
+import org.bukkit.inventory.EquipmentSlot;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+/** Native book payloads feed real Paper custom-click events through packaged startup registration. */
+class PartyBookNativeTest {
+    @TempDir Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test void bookCreatesPlayerOwnedPartyThroughNativeCustomClickWithoutInventoryChanges() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player); f.activate(a);
+            var before = a.core.snapshot();
+            open(f, a);
+            var create = button(a, "[Create party]");
+            click(f, a, create);
+            var party = PartyLifecycleNativeTest.parties(f).partyOf(a.core.id).orElseThrow();
+            assertEquals(a.core.id, party.leader());
+            assertEquals(java.util.List.of(a.core.id), party.members());
+            click(f, a, create); // The old page cannot perform the action twice.
+            assertEquals(party, PartyLifecycleNativeTest.parties(f).partyOf(a.core.id).orElseThrow());
+            assertArrayEquals(before, a.core.snapshot());
+        }
+    }
+
+    @Test void memberBookLeavePreservesPartyButLeaderBookLeaveDisbandsWithoutSuccession() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var leader = new FantasyStickLifecycleNativeTest.Actor(data);
+            var member = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(leader.core.id, leader.player); f.players.put(member.core.id, member.player);
+            f.activate(leader); f.activate(member);
+            var parties = PartyLifecycleNativeTest.parties(f);
+            var party = parties.create(leader.core.id).orElseThrow();
+            assertTrue(parties.accept(member.core.id, parties.invite(leader.core.id, party.id(), member.core.id).orElseThrow().id()));
+            open(f, member); click(f, member, button(member, "[Leave party]"));
+            assertTrue(parties.partyOf(member.core.id).isEmpty());
+            assertEquals(party.id(), parties.partyOf(leader.core.id).orElseThrow().id());
+            assertTrue(parties.accept(member.core.id, parties.invite(leader.core.id, party.id(), member.core.id).orElseThrow().id()));
+            open(f, leader); click(f, leader, button(leader, "[Leave party]"));
+            assertTrue(parties.partyOf(leader.core.id).isEmpty());
+            assertTrue(parties.partyOf(member.core.id).isEmpty());
+        }
+    }
+
+    @Test void nativeBookInvitesRequireAcceptanceDisplayCharacterNamesAndAllowLeaderKick() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var leader = new FantasyStickLifecycleNativeTest.Actor(data);
+            var member = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(leader.core.id, leader.player); f.players.put(member.core.id, member.player);
+            f.activate(leader); f.activate(member);
+            var parties = PartyLifecycleNativeTest.parties(f);
+            open(f, leader); click(f, leader, button(leader, "[Create party]")); drain(f);
+            click(f, leader, button(leader, "[Invite players]"));
+            assertTrue(text(leader).contains(member.core.record.name()));
+            click(f, leader, button(leader, "[Invite]"));
+            assertTrue(parties.partyOf(member.core.id).isEmpty());
+            assertTrue(member.messages.stream().anyMatch(message -> message.contains("invitation")));
+            open(f, member); click(f, member, button(member, "[Invitations]"));
+            assertTrue(text(member).contains(leader.core.record.name()));
+            click(f, member, button(member, "[Accept]")); drain(f);
+            assertEquals(parties.partyOf(leader.core.id), parties.partyOf(member.core.id));
+            assertTrue(text(member).contains(leader.core.record.name()));
+            assertTrue(text(member).contains(member.core.record.name()));
+            open(f, leader); click(f, leader, button(leader, "[Kick]"));
+            assertTrue(parties.partyOf(member.core.id).isEmpty());
+            assertEquals(java.util.List.of(leader.core.id), parties.partyOf(leader.core.id).orElseThrow().members());
+            drain(f); click(f, leader, button(leader, "[Disband party]"));
+            assertTrue(parties.partyOf(leader.core.id).isEmpty());
+        }
+    }
+
+    @Test void copiedReplacedMalformedAndWrongNamespaceActionsCannotCreateParties() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            var b = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player); f.players.put(b.core.id, b.player);
+            f.activate(a); f.activate(b);
+            open(f, a); var old = button(a, "[Create party]");
+            open(f, b); click(f, b, old);
+            assertTrue(PartyLifecycleNativeTest.parties(f).partyOf(b.core.id).isEmpty());
+            open(f, a); var current = button(a, "[Create party]");
+            click(f, a, old);
+            for (var payload : java.util.List.of(net.minecraft.nbt.StringTag.valueOf("x".repeat(1000)),
+                    net.minecraft.nbt.StringTag.valueOf("not-a-token"), new net.minecraft.nbt.CompoundTag())) {
+                click(f, a, new net.minecraft.network.chat.ClickEvent.Custom(current.id(), java.util.Optional.of(payload)));
+            }
+            click(f, a, new net.minecraft.network.chat.ClickEvent.Custom(
+                net.minecraft.resources.Identifier.fromNamespaceAndPath("other", "party_book"), current.payload()));
+            assertTrue(PartyLifecycleNativeTest.parties(f).partyOf(a.core.id).isEmpty());
+            click(f, a, current);
+            assertTrue(PartyLifecycleNativeTest.parties(f).partyOf(a.core.id).isPresent(), "Invalid packets must not consume the legitimate view");
+        }
+    }
+
+    @Test void changedSlotOrEndedCharacterCannotUseOldPartyControlsEvenAfterReturningToBookSlot() throws Exception {
+        for (int route = 0; route < 3; route++) try (var f = new FantasyStickLifecycleNativeTest.Fixture(data.resolve("route-" + route))) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data.resolve("route-" + route));
+            f.players.put(a.core.id, a.player); f.activate(a);
+            var parties = PartyLifecycleNativeTest.parties(f);
+            open(f, a); var action = button(a, "[Create party]");
+            if (route == 0) a.core.inventory.getInventory().setSelectedSlot(1);
+            else if (route == 1) { a.core.inventory.setItemInOffHand(null); f.changed(a); }
+            else { f.plugin.setEnabled(false); f.awaitWorkers(); }
+            click(f, a, action);
+            a.core.inventory.getInventory().setSelectedSlot(0);
+            click(f, a, action);
+            assertTrue(parties.partyOf(a.core.id).isEmpty());
+        }
+    }
+
+    @Test void managementRechecksPartyIdentityRatherThanDisbandingAReplacementFromAnOldPage() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player); f.activate(a);
+            var parties = PartyLifecycleNativeTest.parties(f);
+            var previous = parties.create(a.core.id).orElseThrow();
+            open(f, a); var old = button(a, "[Disband party]");
+            assertTrue(parties.leave(a.core.id, previous.id()));
+            var replacement = parties.create(a.core.id).orElseThrow();
+            click(f, a, old);
+            assertEquals(replacement, parties.partyOf(a.core.id).orElseThrow());
+            assertTrue(a.messages.stream().anyMatch(message -> message.contains("Party action unavailable")));
+        }
+    }
+
+    @Test void inviteChoicesArePagedAndMovingPagesRevokesTheOldPagesActions() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player); f.activate(a);
+            var candidates = new java.util.ArrayList<UUID>();
+            for (int i = 0; i < 101; i++) {
+                var id = UUID.randomUUID(); candidates.add(id);
+                var player = mock(org.bukkit.entity.Player.class);
+                when(player.getUniqueId()).thenReturn(id); when(player.isOnline()).thenReturn(true);
+                when(player.getName()).thenReturn("Candidate " + i); f.players.put(id, player);
+            }
+            var parties = PartyLifecycleNativeTest.parties(f);
+            parties.create(a.core.id).orElseThrow();
+            open(f, a); click(f, a, button(a, "[Invite players]"));
+            var old = button(a, "[Invite]");
+            assertTrue(((org.bukkit.inventory.meta.BookMeta) a.books.getLast().getItemMeta()).getPageCount() <= 100);
+            click(f, a, button(a, "[Next]")); click(f, a, old);
+            assertTrue(candidates.stream().allMatch(id -> parties.invitationsFor(id).isEmpty()));
+            click(f, a, button(a, "[Invite]"));
+            assertEquals(1, candidates.stream().filter(id -> !parties.invitationsFor(id).isEmpty()).count());
+        }
+    }
+
+    @Test void anInvitationAlreadyRenderedInTheBookCannotBeAcceptedAtItsRealTimeDeadline() throws Exception {
+        var now = new java.util.concurrent.atomic.AtomicReference<>(java.time.Instant.EPOCH);
+        var clock = new java.time.Clock() {
+            @Override public java.time.ZoneId getZone() { return java.time.ZoneOffset.UTC; }
+            @Override public java.time.Clock withZone(java.time.ZoneId zone) { return this; }
+            @Override public java.time.Instant instant() { return now.get(); }
+        };
+        try (var clocks = mockStatic(java.time.Clock.class, CALLS_REAL_METHODS)) {
+            clocks.when(java.time.Clock::systemUTC).thenReturn(clock);
+            try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+                f.plugin.setEnabled(true);
+                var leader = new FantasyStickLifecycleNativeTest.Actor(data);
+                var member = new FantasyStickLifecycleNativeTest.Actor(data);
+                f.players.put(leader.core.id, leader.player); f.players.put(member.core.id, member.player);
+                f.activate(leader); f.activate(member);
+                var parties = PartyLifecycleNativeTest.parties(f);
+                var group = parties.create(leader.core.id).orElseThrow();
+                parties.invite(leader.core.id, group.id(), member.core.id).orElseThrow();
+                open(f, member); click(f, member, button(member, "[Invitations]"));
+                var accept = button(member, "[Accept]");
+                now.set(java.time.Instant.EPOCH.plusSeconds(60));
+                click(f, member, accept);
+                assertTrue(parties.partyOf(member.core.id).isEmpty());
+                assertTrue(parties.invitationsFor(member.core.id).isEmpty());
+            }
+        }
+    }
+
+    @Test void anOpenAcceptancePageCannotOverfillAPartyThatFilledAfterRendering() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var leader = new FantasyStickLifecycleNativeTest.Actor(data);
+            var member = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(leader.core.id, leader.player); f.players.put(member.core.id, member.player);
+            f.activate(leader); f.activate(member);
+            var parties = PartyLifecycleNativeTest.parties(f);
+            var group = parties.create(leader.core.id).orElseThrow();
+            parties.invite(leader.core.id, group.id(), member.core.id).orElseThrow();
+            open(f, member); click(f, member, button(member, "[Invitations]"));
+            var accept = button(member, "[Accept]");
+            for (int i = 0; i < 5; i++) {
+                UUID id = UUID.randomUUID();
+                var player = mock(org.bukkit.entity.Player.class);
+                when(player.getUniqueId()).thenReturn(id); when(player.isOnline()).thenReturn(true);
+                f.players.put(id, player);
+                assertTrue(parties.accept(id, parties.invite(leader.core.id, group.id(), id).orElseThrow().id()));
+            }
+            click(f, member, accept);
+            assertTrue(parties.partyOf(member.core.id).isEmpty());
+            assertEquals(6, parties.partyOf(leader.core.id).orElseThrow().members().size());
+        }
+    }
+
+    @Test void sheetTransferAndCharacterSwitchKeepMembershipOnThePlayerAndInvalidateOldBookActions() throws Exception {
+        java.nio.file.Files.writeString(data.resolve("config.yml"), "character-swap-cooldown-seconds: 0\n");
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            var b = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(a.core.id, a.player); f.players.put(b.core.id, b.player);
+            var otherSheet = b.core.inventory.getItemInOffHand().clone();
+            f.activate(a);
+            var parties = PartyLifecycleNativeTest.parties(f);
+            var party = parties.create(a.core.id).orElseThrow();
+            open(f, a); var oldDisband = button(a, "[Disband party]");
+            var sheet = a.core.inventory.getItemInOffHand().clone();
+            a.core.inventory.setItemInOffHand(null); f.changed(a);
+            f.awaitCharacterAndReceipt(a);
+            b.core.inventory.setItemInOffHand(sheet); f.activate(b);
+            open(f, b);
+            assertTrue(text(b).contains(a.core.record.name()));
+            assertTrue(parties.partyOf(b.core.id).isEmpty(), "A traded sheet must not transfer party membership");
+            click(f, b, oldDisband);
+            a.core.inventory.setItemInOffHand(otherSheet); f.activate(a);
+            open(f, a);
+            assertTrue(text(a).contains(b.core.record.name()));
+            assertEquals(party.id(), parties.partyOf(a.core.id).orElseThrow().id());
+            click(f, a, oldDisband);
+            assertEquals(party.id(), parties.partyOf(a.core.id).orElseThrow().id());
+        }
+    }
+
+    static String text(FantasyStickLifecycleNativeTest.Actor a) {
+        return org.bukkit.craftbukkit.inventory.CraftItemStack.asNMSCopy(a.books.getLast())
+            .get(net.minecraft.core.component.DataComponents.WRITTEN_BOOK_CONTENT).pages().stream()
+            .map(page -> page.raw().getString()).collect(java.util.stream.Collectors.joining("\n"));
+    }
+
+    static void open(FantasyStickLifecycleNativeTest.Fixture f, FantasyStickLifecycleNativeTest.Actor a) throws Exception {
+        f.dispatcher.accept(new PlayerInteractEvent(a.player, Action.RIGHT_CLICK_AIR, a.core.inventory.getItemInMainHand(),
+            null, BlockFace.SELF, EquipmentSlot.HAND));
+        drain(f);
+    }
+    static void drain(FantasyStickLifecycleNativeTest.Fixture f) throws Exception {
+        ((CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters"))
+            .find(UUID.randomUUID()).get(5, TimeUnit.SECONDS);
+        Runnable task;
+        while ((task = f.tasks.poll()) != null) task.run();
+    }
+    static net.minecraft.network.chat.ClickEvent.Custom button(FantasyStickLifecycleNativeTest.Actor a, String label) {
+        var book = org.bukkit.craftbukkit.inventory.CraftItemStack.asNMSCopy(a.books.getLast())
+            .get(net.minecraft.core.component.DataComponents.WRITTEN_BOOK_CONTENT);
+        assertNotNull(book);
+        for (var page : book.pages()) {
+            var click = find(page.raw(), label);
+            if (click != null) return click;
+        }
+        throw new AssertionError("Missing native book action " + label);
+    }
+    static net.minecraft.network.chat.ClickEvent.Custom find(net.minecraft.network.chat.Component component, String label) {
+        if (component.getString().equals(label) && component.getStyle().getClickEvent() instanceof net.minecraft.network.chat.ClickEvent.Custom custom) return custom;
+        for (var child : component.getSiblings()) {
+            var found = find(child, label);
+            if (found != null) return found;
+        }
+        return null;
+    }
+    static void click(FantasyStickLifecycleNativeTest.Fixture f, FantasyStickLifecycleNativeTest.Actor a,
+                      net.minecraft.network.chat.ClickEvent.Custom click) {
+        var connection = mock(io.papermc.paper.connection.PlayerGameConnection.class);
+        when(connection.getPlayer()).thenReturn(a.player);
+        f.dispatcher.accept(new io.papermc.paper.event.player.PaperPlayerCustomClickEvent(
+            net.kyori.adventure.key.Key.key(click.id().toString()), connection, click.payload().orElse(null)));
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/PartyCombatNativeTest.java

@@ -0,0 +1,431 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+import java.nio.file.Path;
+import org.bukkit.damage.DamageSource;
+import org.bukkit.entity.Entity;
+import org.bukkit.event.entity.EntityDamageByEntityEvent;
+import org.bukkit.event.entity.EntityDamageEvent.DamageCause;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+/** Actual packaged listeners and book clicks; native damage events have explicit world/source ports. */
+class PartyCombatNativeTest {
+    @TempDir Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+    private static final java.util.Map<org.bukkit.entity.Player, java.util.Map<org.bukkit.potion.PotionEffectType, net.minecraft.world.effect.MobEffectInstance>> effects = new java.util.WeakHashMap<>();
+    private static final java.util.Map<org.bukkit.entity.Player, Integer> fires = new java.util.WeakHashMap<>();
+
+    @Test void bookConsentProtectsCombatAndBookLeaveKickDisbandImmediatelyRemoveProtection() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = actor(f); var b = actor(f);
+            f.activate(a); f.activate(b);
+            assertFalse(hit(f, a.player, b.player).isCancelled(), "Non-party fantasy combat remains available");
+            createAndInvite(f, a, b);
+            assertFalse(hit(f, a.player, b.player).isCancelled(), "An invitation is not membership");
+            accept(f, b);
+            assertTrue(hit(f, a.player, b.player).isCancelled(), "Book acceptance must protect native combat");
+            assertTrue(hit(f, b.player, a.player).isCancelled());
+            PartyBookNativeTest.open(f, b); action(f, b, "Leave party");
+            assertFalse(hit(f, a.player, b.player).isCancelled());
+            invite(f, a); accept(f, b);
+            PartyBookNativeTest.open(f, a); action(f, a, "Kick");
+            assertFalse(hit(f, a.player, b.player).isCancelled());
+            invite(f, a); accept(f, b);
+            PartyBookNativeTest.open(f, a); action(f, a, "Disband party");
+            assertFalse(hit(f, a.player, b.player).isCancelled());
+        }
+    }
+
+    @Test void mixedModesAreProtectedBothWaysButOrdinaryCombatMobsSelfDamageAndPriorVetoesAreUnchanged() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = actor(f); var b = actor(f);
+            assertFalse(hit(f, a.player, b.player).isCancelled());
+            f.activate(a);
+            assertTrue(hit(f, a.player, b.player).isCancelled());
+            assertTrue(hit(f, b.player, a.player).isCancelled());
+            assertFalse(hit(f, entity(org.bukkit.entity.Zombie.class), a.player).isCancelled());
+            assertFalse(hit(f, a.player, entity(org.bukkit.entity.Zombie.class)).isCancelled());
+            assertFalse(hit(f, a.player, a.player).isCancelled());
+            var environmental = new org.bukkit.event.entity.EntityDamageEvent(a.player, DamageCause.FALL, mock(DamageSource.class), 4);
+            f.dispatcher.accept(environmental); assertFalse(environmental.isCancelled());
+            f.activate(b);
+            var damage = mock(DamageSource.class);
+            when(damage.getCausingEntity()).thenReturn(a.player);
+            var veto = new EntityDamageByEntityEvent(a.player, b.player, DamageCause.ENTITY_ATTACK, damage, 4);
+            veto.setCancelled(true); f.dispatcher.accept(veto);
+            assertTrue(veto.isCancelled()); assertEquals(4, veto.getDamage());
+            var group = PartyLifecycleNativeTest.parties(f).create(a.core.id).orElseThrow();
+            assertTrue(PartyLifecycleNativeTest.parties(f).accept(b.core.id,
+                PartyLifecycleNativeTest.parties(f).invite(a.core.id, group.id(), b.core.id).orElseThrow().id()));
+            exit(f, a); exit(f, b);
+            assertFalse(hit(f, a.player, b.player).isCancelled(), "Retained membership is not ordinary PvP immunity");
+        }
+    }
+
+    @Test void projectilesRecheckPartyAtImpactAndCannotBorrowANewSessionAfterExitOrSwitch() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = actor(f); var b = actor(f);
+            f.activate(a); f.activate(b);
+            var arrow = projectile(f, a.player);
+            assertFalse(hit(f, arrow, b.player).isCancelled());
+            createAndInvite(f, a, b); accept(f, b);
+            assertTrue(hit(f, arrow, b.player).isCancelled(), "Native indirect attribution must use current party");
+            PartyBookNativeTest.open(f, b); action(f, b, "Leave party");
+            assertFalse(hit(f, arrow, b.player).isCancelled());
+            var sheet = a.core.inventory.getItemInOffHand().clone();
+            exit(f, a);
+            assertTrue(hit(f, arrow, b.player).isCancelled(), "Fantasy projectile loses authority on exit");
+            a.core.inventory.setItemInOffHand(sheet); f.activate(a);
+            assertTrue(hit(f, arrow, b.player).isCancelled(), "Same character reentry is still a different session");
+            assertFalse(hit(f, projectile(f, a.player), b.player).isCancelled());
+            var stranger = actor(f);
+            var ordinaryArrow = projectile(f, stranger.player);
+            assertTrue(hit(f, ordinaryArrow, b.player).isCancelled());
+            f.activate(stranger);
+            assertTrue(hit(f, ordinaryArrow, b.player).isCancelled(), "Old ordinary projectile must not become fantasy damage");
+        }
+    }
+
+    @Test void explosiveFangsCloudPetAndFireworkSourcesRespectPartiesAndCapturedSessions() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = actor(f); var b = actor(f); f.activate(a); f.activate(b);
+            createAndInvite(f, a, b); accept(f, b);
+            var tnt = entity(org.bukkit.entity.TNTPrimed.class); when(tnt.getSource()).thenReturn(a.player);
+            var fangs = entity(org.bukkit.entity.EvokerFangs.class); when(fangs.getOwner()).thenReturn(a.player);
+            var cloud = entity(org.bukkit.entity.AreaEffectCloud.class); when(cloud.getSource()).thenReturn(a.player);
+            var pet = entity(org.bukkit.entity.Wolf.class); when(pet.getOwnerUniqueId()).thenReturn(a.core.id);
+            var firework = entity(org.bukkit.entity.Firework.class); when(firework.getSpawningEntity()).thenReturn(a.core.id);
+            for (var source : java.util.List.of(tnt, fangs, cloud, firework)) f.dispatcher.accept(new org.bukkit.event.entity.EntitySpawnEvent(source));
+            for (var source : java.util.List.of(tnt, fangs, cloud, pet, firework)) {
+                assertTrue(hit(f, source, b.player).isCancelled(), source.getClass().toString());
+            }
+            PartyBookNativeTest.open(f, b); action(f, b, "Leave party");
+            for (var source : java.util.List.of(tnt, fangs, cloud, pet, firework)) assertFalse(hit(f, source, b.player).isCancelled());
+            exit(f, a);
+            for (var source : java.util.List.of(tnt, fangs, cloud, pet, firework)) assertTrue(hit(f, source, b.player).isCancelled());
+        }
+    }
+
+    @Test void lingeringCloudInheritsTheOriginalThrownPotionSessionRatherThanItsOwnersReplacement() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = actor(f); var b = actor(f); f.activate(a); f.activate(b);
+            var potion = entity(org.bukkit.entity.ThrownPotion.class); when(potion.getShooter()).thenReturn(a.player);
+            f.dispatcher.accept(new org.bukkit.event.entity.ProjectileLaunchEvent(potion));
+            var cloud = entity(org.bukkit.entity.AreaEffectCloud.class); when(cloud.getSource()).thenReturn(a.player);
+            var splash = new org.bukkit.event.entity.LingeringPotionSplashEvent(potion, cloud);
+            f.dispatcher.accept(splash); assertFalse(splash.isCancelled());
+            var sheet = a.core.inventory.getItemInOffHand().clone(); exit(f, a);
+            a.core.inventory.setItemInOffHand(sheet); f.activate(a);
+            f.dispatcher.accept(new org.bukkit.event.entity.EntitySpawnEvent(cloud));
+            assertTrue(hit(f, cloud, b.player).isCancelled());
+        }
+    }
+
+    @Test void poisonAndWitherRevalidateEachTickAndClearOnRemovalReplacementWithoutTouchingHealing() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = actor(f); var b = actor(f); f.activate(a); f.activate(b);
+            for (var type : java.util.List.of(org.bukkit.potion.PotionEffectType.POISON, org.bukkit.potion.PotionEffectType.WITHER)) {
+                var effect = new org.bukkit.potion.PotionEffect(type, 200, 0);
+                var cause = type.equals(org.bukkit.potion.PotionEffectType.POISON) ? DamageCause.POISON : DamageCause.WITHER;
+                assertFalse(apply(f, b, null, effect, a.player).isCancelled());
+                assertFalse(tickDamage(f, b, cause).isCancelled());
+                createAndInvite(f, a, b); accept(f, b);
+                assertTrue(tickDamage(f, b, cause).isCancelled(), "Tick loses native attacker but not our application provenance");
+                var heal = new org.bukkit.potion.PotionEffect(org.bukkit.potion.PotionEffectType.REGENERATION, 200, 0);
+                assertFalse(apply(f, b, null, heal, a.player).isCancelled());
+                assertTrue(apply(f, b, effect, new org.bukkit.potion.PotionEffect(type, 300, 1), a.player).isCancelled());
+                var remove = new org.bukkit.event.entity.EntityPotionEffectEvent(b.player, effect, null, null,
+                    org.bukkit.event.entity.EntityPotionEffectEvent.Cause.MILK, org.bukkit.event.entity.EntityPotionEffectEvent.Action.REMOVED, false);
+                f.dispatcher.accept(remove); effects.get(b.player).remove(type);
+                assertFalse(tickDamage(f, b, cause).isCancelled(), "Removed attribution must not protect unrelated later damage");
+                PartyBookNativeTest.open(f, a); action(f, a, "Disband party");
+                assertFalse(apply(f, b, null, effect, a.player).isCancelled());
+                // An unrelated mob/environmental replacement clears only this effect's provenance.
+                assertFalse(apply(f, b, effect, new org.bukkit.potion.PotionEffect(type, 300, 1), null).isCancelled());
+                createAndInvite(f, a, b); accept(f, b);
+                assertFalse(tickDamage(f, b, cause).isCancelled());
+                PartyBookNativeTest.open(f, a); action(f, a, "Disband party");
+            }
+        }
+    }
+
+    @Test void ongoingDamageCannotMoveToANewSourceOrTargetSessionAndCancelledChangesDoNotEraseProvenance() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = actor(f); var b = actor(f); f.activate(a); f.activate(b);
+            var effect = new org.bukkit.potion.PotionEffect(org.bukkit.potion.PotionEffectType.POISON, 200, 0);
+            apply(f, b, null, effect, a.player);
+            var replacement = new org.bukkit.event.entity.EntityPotionEffectEvent(b.player, effect, null, null,
+                org.bukkit.event.entity.EntityPotionEffectEvent.Cause.MILK, org.bukkit.event.entity.EntityPotionEffectEvent.Action.REMOVED, false);
+            replacement.setCancelled(true); f.dispatcher.accept(replacement);
+            var sheet = b.core.inventory.getItemInOffHand().clone(); exit(f, b);
+            assertTrue(tickDamage(f, b, DamageCause.POISON).isCancelled());
+            b.core.inventory.setItemInOffHand(sheet); f.activate(b);
+            assertTrue(tickDamage(f, b, DamageCause.POISON).isCancelled(), "An old poison cannot attack a replacement target session");
+            apply(f, b, effect, new org.bukkit.potion.PotionEffect(effect.getType(), 300, 1), a.player);
+            assertFalse(tickDamage(f, b, DamageCause.POISON).isCancelled());
+            exit(f, a);
+            assertTrue(tickDamage(f, b, DamageCause.POISON).isCancelled());
+        }
+    }
+
+    @Test void burningChecksPartyEveryTickAndCancelledOrEnvironmentalIgnitionCannotStealAttribution() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = actor(f); var b = actor(f); f.activate(a); f.activate(b);
+            var arrow = projectile(f, a.player);
+            var fire = new org.bukkit.event.entity.EntityCombustByEntityEvent(arrow, b.player, 10.0f);
+            f.dispatcher.accept(fire); assertFalse(fire.isCancelled()); fires.put(b.player, 200);
+            assertFalse(tickDamage(f, b, DamageCause.FIRE_TICK).isCancelled());
+            createAndInvite(f, a, b); accept(f, b);
+            assertTrue(tickDamage(f, b, DamageCause.FIRE_TICK).isCancelled());
+            var refused = new org.bukkit.event.entity.EntityCombustByEntityEvent(arrow, b.player, 15.0f);
+            f.dispatcher.accept(refused); assertTrue(refused.isCancelled());
+            var cancelledEnvironmental = new org.bukkit.event.entity.EntityCombustEvent(b.player, 5.0f);
+            cancelledEnvironmental.setCancelled(true); f.dispatcher.accept(cancelledEnvironmental);
+            assertTrue(tickDamage(f, b, DamageCause.FIRE_TICK).isCancelled());
+            f.dispatcher.accept(new org.bukkit.event.entity.EntityCombustEvent(b.player, 15.0f));
+            assertFalse(tickDamage(f, b, DamageCause.FIRE_TICK).isCancelled());
+            assertFalse(tickDamage(f, b, DamageCause.LAVA).isCancelled());
+        }
+    }
+
+    @Test void expiredAndHiddenPotionLayersKeepOnlyTheirOwnSourceAndFireExpiryIsCleaned() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = actor(f); var b = actor(f); f.activate(a); f.activate(b);
+            var type = org.bukkit.potion.PotionEffectType.POISON;
+            var poison = new org.bukkit.potion.PotionEffect(type, 200, 0);
+            apply(f, b, null, poison, a.player);
+            // A shorter, stronger environmental layer temporarily covers the attributable one.
+            apply(f, b, poison, new org.bukkit.potion.PotionEffect(type, 40, 1), null);
+            createAndInvite(f, a, b); accept(f, b);
+            assertFalse(tickDamage(f, b, DamageCause.POISON).isCancelled(), "Environmental top layer must not inherit old source");
+            var nativeEffect = effects.get(b.player).get(type);
+            assertNotNull(nativeEffect.hiddenEffect);
+            effects.get(b.player).put(type, nativeEffect.hiddenEffect);
+            assertTrue(tickDamage(f, b, DamageCause.POISON).isCancelled(), "Native hidden-layer restoration retains its own source");
+            effects.get(b.player).clear();
+            for (var pulse : f.pulses) pulse.run();
+            assertFalse(b.core.pdc.getKeys().stream().anyMatch(key -> key.getKey().startsWith("combat_dot_")));
+            assertFalse(tickDamage(f, b, DamageCause.POISON).isCancelled());
+            PartyBookNativeTest.open(f, a); action(f, a, "Disband party");
+            f.dispatcher.accept(new org.bukkit.event.entity.EntityCombustByEntityEvent(a.player, b.player, 2.0f));
+            fires.put(b.player, 40);
+            createAndInvite(f, a, b); accept(f, b);
+            assertTrue(tickDamage(f, b, DamageCause.FIRE_TICK).isCancelled());
+            fires.put(b.player, 0);
+            for (var pulse : f.pulses) pulse.run();
+            assertFalse(b.core.pdc.getKeys().stream().anyMatch(key -> key.getKey().startsWith("combat_dot_")));
+            fires.put(b.player, 20); // Later unrelated fire must not borrow a stale player source.
+            assertFalse(tickDamage(f, b, DamageCause.FIRE_TICK).isCancelled());
+        }
+    }
+
+    @Test void staleNativeSplashIsCancelledBeforeOwnerOnlyEffectAttributionAndValidHealingIsUntouched() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = actor(f); var b = actor(f); f.activate(a); f.activate(b);
+            var potion = entity(org.bukkit.entity.ThrownPotion.class); when(potion.getShooter()).thenReturn(a.player);
+            f.dispatcher.accept(new org.bukkit.event.entity.ProjectileLaunchEvent(potion));
+            var splash = new org.bukkit.event.entity.PotionSplashEvent(potion, new java.util.HashMap<>(java.util.Map.of(b.player, 1.0)));
+            f.dispatcher.accept(splash); assertFalse(splash.isCancelled());
+            assertEquals(1.0, splash.getIntensity(b.player));
+            var sheet = a.core.inventory.getItemInOffHand().clone(); exit(f, a);
+            a.core.inventory.setItemInOffHand(sheet); f.activate(a);
+            var stale = new org.bukkit.event.entity.PotionSplashEvent(potion, new java.util.HashMap<>(java.util.Map.of(b.player, 1.0)));
+            f.dispatcher.accept(stale);
+            assertTrue(stale.isCancelled(), "Native splash passes only owner to addEffect: stop stale continuation before attribution is lost");
+            var arrow = projectile(f, a.player);
+            createAndInvite(f, a, b); accept(f, b);
+            var impact = new org.bukkit.event.entity.ProjectileHitEvent(arrow, b.player);
+            f.dispatcher.accept(impact); assertTrue(impact.isCancelled());
+            var heal = new org.bukkit.potion.PotionEffect(org.bukkit.potion.PotionEffectType.REGENERATION, 100, 0);
+            assertFalse(apply(f, b, null, heal, a.player).isCancelled());
+        }
+    }
+
+    @Test void cancelledApplicationsAndLaunchesRetainUnrelatedDataAndCleanupStopsOnDisable() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = actor(f); var b = actor(f); f.activate(a); f.activate(b);
+            var arrow = entity(org.bukkit.entity.Arrow.class); when(arrow.getShooter()).thenReturn(a.player);
+            var launch = new org.bukkit.event.entity.ProjectileLaunchEvent(arrow); launch.setCancelled(true);
+            var unrelated = new org.bukkit.NamespacedKey("other", "state");
+            arrow.getPersistentDataContainer().set(unrelated, org.bukkit.persistence.PersistentDataType.STRING, "retained");
+            f.dispatcher.accept(launch);
+            assertEquals(java.util.Set.of(unrelated), arrow.getPersistentDataContainer().getKeys());
+            var effect = new org.bukkit.potion.PotionEffect(org.bukkit.potion.PotionEffectType.POISON, 200, 0);
+            var veto = new org.bukkit.event.entity.EntityPotionEffectEvent(b.player, null, effect, a.player,
+                org.bukkit.event.entity.EntityPotionEffectEvent.Cause.POTION_SPLASH,
+                org.bukkit.event.entity.EntityPotionEffectEvent.Action.ADDED, false);
+            veto.setCancelled(true); f.dispatcher.accept(veto);
+            assertTrue(veto.isCancelled());
+            assertFalse(b.core.pdc.getKeys().stream().anyMatch(key -> key.getKey().startsWith("combat_dot_")));
+            var before = new games.dmg.fantasystick.persistence.YamlCharacterRepository(data).load(a.core.record.id());
+            createAndInvite(f, a, b); accept(f, b);
+            assertEquals(before, new games.dmg.fantasystick.persistence.YamlCharacterRepository(data).load(a.core.record.id()), "Party proximity does not grant progress or XP");
+            f.plugin.setEnabled(false); f.awaitWorkers();
+            for (var timer : f.timers) verify(timer, atLeastOnce()).cancel();
+            for (var pulse : f.pulses) pulse.run();
+        }
+    }
+
+    @Test void aCapturedFantasySourceRequiresCurrentOffhandCustodyAndConnectionNotJustRegistryPresence() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = actor(f); var b = actor(f); f.activate(a); f.activate(b);
+            var arrow = projectile(f, a.player);
+            a.core.online = false;
+            assertTrue(hit(f, arrow, b.player).isCancelled());
+            a.core.online = true;
+            var sheet = a.core.inventory.getItemInOffHand().clone();
+            a.core.inventory.setItemInOffHand(null); // Before the slot-change/recovery callback.
+            assertTrue(hit(f, arrow, b.player).isCancelled());
+            a.core.inventory.setItemInOffHand(sheet);
+            assertFalse(hit(f, arrow, b.player).isCancelled());
+        }
+    }
+
+    @Test void nativeSerializationAndRestartKeepStaleDamageProvenanceButNeverRestorePartiesOrXp() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = actor(f); var b = actor(f); f.activate(a); f.activate(b);
+            var arrow = projectile(f, a.player);
+            var restoredArrow = entity(org.bukkit.entity.Arrow.class); when(restoredArrow.getShooter()).thenReturn(a.player);
+            restoredArrow.getPersistentDataContainer().readFromBytes(arrow.getPersistentDataContainer().serializeToBytes(), true);
+            var poison = new org.bukkit.potion.PotionEffect(org.bukkit.potion.PotionEffectType.POISON, 200, 0);
+            apply(f, b, null, poison, a.player);
+            createAndInvite(f, a, b); accept(f, b);
+            f.plugin.setEnabled(false); f.awaitWorkers();
+            b.core.pdc.readFromBytes(b.core.pdc.serializeToBytes(), true);
+            f.plugin.setEnabled(true);
+            assertTrue(PartyLifecycleNativeTest.parties(f).partyOf(a.core.id).isEmpty());
+            assertTrue(hit(f, restoredArrow, b.player).isCancelled());
+            assertTrue(tickDamage(f, b, DamageCause.POISON).isCancelled());
+            assertFalse(hit(f, a.player, b.player).isCancelled());
+            assertFalse(tickDamage(f, b, DamageCause.LAVA).isCancelled());
+            // Malformed plugin-owned provenance cannot confer immunity or erase other namespaces.
+            var key = b.core.pdc.getKeys().stream().filter(k -> k.getKey().startsWith("combat_dot_")).findFirst().orElseThrow();
+            var other = new org.bukkit.NamespacedKey("other", "state");
+            b.core.pdc.set(other, org.bukkit.persistence.PersistentDataType.STRING, "preserved");
+            b.core.pdc.set(key, org.bukkit.persistence.PersistentDataType.STRING, "malformed");
+            assertFalse(tickDamage(f, b, DamageCause.POISON).isCancelled());
+            assertFalse(b.core.pdc.has(key));
+            assertEquals("preserved", b.core.pdc.get(other, org.bukkit.persistence.PersistentDataType.STRING));
+        }
+    }
+
+    @Test void weakerHiddenEffectsAndInfiniteDurationsMatchNativeReplacementSemantics() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = actor(f); var b = actor(f); f.activate(a); f.activate(b);
+            var type = org.bukkit.potion.PotionEffectType.WITHER;
+            var strong = new org.bukkit.potion.PotionEffect(type, 40, 2);
+            apply(f, b, null, strong, null);
+            var weaker = new org.bukkit.potion.PotionEffect(type, -1, 0);
+            var hidden = new org.bukkit.event.entity.EntityPotionEffectEvent(b.player, strong, weaker, a.player,
+                org.bukkit.event.entity.EntityPotionEffectEvent.Cause.POTION_SPLASH,
+                org.bukkit.event.entity.EntityPotionEffectEvent.Action.CHANGED, false);
+            f.dispatcher.accept(hidden); assertFalse(hidden.isCancelled());
+            var nativeEffect = effects.get(b.player).get(type);
+            nativeEffect.update(new net.minecraft.world.effect.MobEffectInstance(
+                org.bukkit.craftbukkit.potion.CraftPotionEffectType.bukkitToMinecraftHolder(type), -1, 0));
+            createAndInvite(f, a, b); accept(f, b);
+            assertFalse(tickDamage(f, b, DamageCause.WITHER).isCancelled());
+            effects.get(b.player).put(type, nativeEffect.hiddenEffect);
+            assertTrue(tickDamage(f, b, DamageCause.WITHER).isCancelled());
+            // An infinite active effect is not replaced by a shorter same-strength application.
+            assertFalse(apply(f, b, weaker, new org.bukkit.potion.PotionEffect(type, 20, 0), null).isCancelled());
+            assertTrue(tickDamage(f, b, DamageCause.WITHER).isCancelled());
+        }
+    }
+
+    static org.bukkit.event.entity.EntityPotionEffectEvent apply(FantasyStickLifecycleNativeTest.Fixture f,
+            FantasyStickLifecycleNativeTest.Actor target, org.bukkit.potion.PotionEffect old,
+            org.bukkit.potion.PotionEffect effect, Entity source) {
+        var event = new org.bukkit.event.entity.EntityPotionEffectEvent(target.player, old, effect, source,
+            org.bukkit.event.entity.EntityPotionEffectEvent.Cause.POTION_SPLASH,
+            old == null ? org.bukkit.event.entity.EntityPotionEffectEvent.Action.ADDED : org.bukkit.event.entity.EntityPotionEffectEvent.Action.CHANGED, true);
+        f.dispatcher.accept(event);
+        if (!event.isCancelled()) {
+            var nativeEffect = new net.minecraft.world.effect.MobEffectInstance(
+                org.bukkit.craftbukkit.potion.CraftPotionEffectType.bukkitToMinecraftHolder(effect.getType()), effect.getDuration(), effect.getAmplifier());
+            var current = effects.get(target.player).get(effect.getType());
+            if (current == null) effects.get(target.player).put(effect.getType(), nativeEffect);
+            else if (event.isOverride() || current.getAmplifier() > nativeEffect.getAmplifier()
+                    && current.isShorterDurationThan(nativeEffect)) current.update(nativeEffect);
+        }
+        return event;
+    }
+    static org.bukkit.event.entity.EntityDamageEvent tickDamage(FantasyStickLifecycleNativeTest.Fixture f,
+            FantasyStickLifecycleNativeTest.Actor target, DamageCause cause) {
+        var event = new org.bukkit.event.entity.EntityDamageEvent(target.player, cause, mock(DamageSource.class), 1);
+        f.dispatcher.accept(event); return event;
+    }
+
+    static org.bukkit.entity.Arrow projectile(FantasyStickLifecycleNativeTest.Fixture f, org.bukkit.entity.Player owner) {
+        var arrow = entity(org.bukkit.entity.Arrow.class);
+        when(arrow.getShooter()).thenReturn(owner);
+        f.dispatcher.accept(new org.bukkit.event.entity.ProjectileLaunchEvent(arrow));
+        return arrow;
+    }
+    static <T extends Entity> T entity(Class<T> type) {
+        var entity = mock(type);
+        when(entity.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+        when(entity.getPersistentDataContainer()).thenReturn(new org.bukkit.craftbukkit.persistence.CraftPersistentDataContainer(
+            new org.bukkit.craftbukkit.persistence.CraftPersistentDataTypeRegistry()));
+        return entity;
+    }
+
+    static void exit(FantasyStickLifecycleNativeTest.Fixture f, FantasyStickLifecycleNativeTest.Actor a) throws Exception {
+        a.core.inventory.setItemInOffHand(null); f.changed(a);
+        PartyBookNativeTest.drain(f); // Health acknowledgment precedes clearing the equipment receipt.
+        f.receipts().find(a.core.id).toCompletableFuture().get(5, java.util.concurrent.TimeUnit.SECONDS);
+    }
+
+    private FantasyStickLifecycleNativeTest.Actor actor(FantasyStickLifecycleNativeTest.Fixture f) throws Exception {
+        var a = new FantasyStickLifecycleNativeTest.Actor(data);
+        f.players.put(a.core.id, a.player);
+        var active = new java.util.HashMap<org.bukkit.potion.PotionEffectType, net.minecraft.world.effect.MobEffectInstance>();
+        effects.put(a.player, active); fires.put(a.player, 0);
+        doAnswer(call -> {
+            var effect = active.get(call.getArgument(0));
+            return effect == null ? null : new org.bukkit.potion.PotionEffect(call.getArgument(0), effect.getDuration(), effect.getAmplifier());
+        }).when(a.player).getPotionEffect(any());
+        doAnswer(call -> fires.get(a.player)).when(a.player).getFireTicks();
+        return a;
+    }
+    static void createAndInvite(FantasyStickLifecycleNativeTest.Fixture f,
+                                FantasyStickLifecycleNativeTest.Actor a, FantasyStickLifecycleNativeTest.Actor b) throws Exception {
+        PartyBookNativeTest.open(f, a); action(f, a, "Create party"); invite(f, a);
+    }
+    static void invite(FantasyStickLifecycleNativeTest.Fixture f, FantasyStickLifecycleNativeTest.Actor a) throws Exception {
+        PartyBookNativeTest.open(f, a); action(f, a, "Invite players"); action(f, a, "Invite");
+    }
+    static void accept(FantasyStickLifecycleNativeTest.Fixture f, FantasyStickLifecycleNativeTest.Actor b) throws Exception {
+        PartyBookNativeTest.open(f, b); action(f, b, "Invitations"); action(f, b, "Accept");
+    }
+    static void action(FantasyStickLifecycleNativeTest.Fixture f, FantasyStickLifecycleNativeTest.Actor a, String label) throws Exception {
+        PartyBookNativeTest.click(f, a, PartyBookNativeTest.button(a, "[" + label + "]"));
+        PartyBookNativeTest.drain(f);
+    }
+    static EntityDamageByEntityEvent hit(FantasyStickLifecycleNativeTest.Fixture f, Entity source, Entity target) {
+        var damage = mock(DamageSource.class);
+        when(damage.getCausingEntity()).thenReturn(source);
+        when(damage.getDirectEntity()).thenReturn(source);
+        var event = new EntityDamageByEntityEvent(source, target, DamageCause.ENTITY_ATTACK, damage, 4);
+        f.dispatcher.accept(event);
+        return event;
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/PartyLifecycleNativeTest.java

@@ -0,0 +1,95 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import games.dmg.fantasystick.party.PartyRoster;
+import java.nio.file.Path;
+import net.kyori.adventure.text.Component;
+import org.bukkit.event.player.PlayerQuitEvent;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+/** Packaged plugin startup and registered native lifecycle events; not proof of book/effect controls. */
+class PartyLifecycleNativeTest {
+    @TempDir Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test void registeredQuitHandlesLastMemberEvenWhileNativeOnlineFlagIsStillTrue() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var leader = new FantasyStickLifecycleNativeTest.Actor(data);
+            var member = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(leader.core.id, leader.player); f.players.put(member.core.id, member.player);
+            var parties = parties(f);
+            var party = parties.create(leader.core.id).orElseThrow();
+            assertTrue(parties.accept(member.core.id, parties.invite(leader.core.id, party.id(), member.core.id).orElseThrow().id()));
+            f.dispatcher.accept(new PlayerQuitEvent(leader.player, Component.empty()));
+            leader.core.online = false;
+            assertEquals(leader.core.id, parties.partyOf(member.core.id).orElseThrow().leader());
+            f.dispatcher.accept(new PlayerQuitEvent(member.player, Component.empty()));
+            assertTrue(parties.partyOf(member.core.id).isEmpty());
+            assertTrue(parties.partyOf(leader.core.id).isEmpty());
+        }
+    }
+
+    @Test void disablingAndReenablingDisbandsAndCannotReuseOldInvitationsOrServices() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var leader = new FantasyStickLifecycleNativeTest.Actor(data);
+            var member = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(leader.core.id, leader.player); f.players.put(member.core.id, member.player);
+            var old = parties(f);
+            var party = old.create(leader.core.id).orElseThrow();
+            var invitation = old.invite(leader.core.id, party.id(), member.core.id).orElseThrow();
+            f.plugin.setEnabled(false); f.awaitWorkers();
+            assertTrue(old.partyOf(leader.core.id).isEmpty());
+            assertFalse(old.accept(member.core.id, invitation.id()));
+            assertTrue(old.create(leader.core.id).isEmpty());
+            f.plugin.setEnabled(true);
+            var fresh = parties(f);
+            assertNotSame(old, fresh);
+            assertTrue(fresh.partyOf(leader.core.id).isEmpty());
+            assertFalse(fresh.accept(member.core.id, invitation.id()));
+            assertNotEquals(party.id(), fresh.create(leader.core.id).orElseThrow().id());
+        }
+    }
+
+    @Test void consecutiveQuitEventsAreAuthoritativeEvenIfBothOnlineFlagsLag() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var leader = new FantasyStickLifecycleNativeTest.Actor(data);
+            var member = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(leader.core.id, leader.player); f.players.put(member.core.id, member.player);
+            var parties = parties(f);
+            var party = parties.create(leader.core.id).orElseThrow();
+            assertTrue(parties.accept(member.core.id, parties.invite(leader.core.id, party.id(), member.core.id).orElseThrow().id()));
+            f.dispatcher.accept(new PlayerQuitEvent(leader.player, Component.empty()));
+            assertEquals(leader.core.id, parties.partyOf(member.core.id).orElseThrow().leader());
+            f.dispatcher.accept(new PlayerQuitEvent(member.player, Component.empty()));
+            assertTrue(parties.partyOf(leader.core.id).isEmpty());
+            assertTrue(parties.partyOf(member.core.id).isEmpty());
+        }
+    }
+
+    @Test void rejoiningBeforeTheOtherMemberQuitsRetainsTheSamePartyAndLeader() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var leader = new FantasyStickLifecycleNativeTest.Actor(data);
+            var member = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(leader.core.id, leader.player); f.players.put(member.core.id, member.player);
+            var parties = parties(f);
+            var party = parties.create(leader.core.id).orElseThrow();
+            assertTrue(parties.accept(member.core.id, parties.invite(leader.core.id, party.id(), member.core.id).orElseThrow().id()));
+            f.dispatcher.accept(new PlayerQuitEvent(leader.player, Component.empty()));
+            f.dispatcher.accept(new org.bukkit.event.player.PlayerJoinEvent(leader.player, Component.empty()));
+            f.dispatcher.accept(new PlayerQuitEvent(member.player, Component.empty()));
+            assertEquals(party.id(), parties.partyOf(leader.core.id).orElseThrow().id());
+            assertEquals(leader.core.id, parties.partyOf(leader.core.id).orElseThrow().leader());
+        }
+    }
+
+    static PartyRoster parties(FantasyStickLifecycleNativeTest.Fixture f) {
+        return (PartyRoster) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "parties");
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/PlayerSheetDropsNativeTest.java

@@ -0,0 +1,344 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import games.dmg.fantasystick.crafting.CharacterFactory;
+import games.dmg.fantasystick.crafting.ManualDropDelivery.Status;
+import games.dmg.fantasystick.crafting.PlayerSheetDrops;
+import games.dmg.fantasystick.items.CharacterSheets;
+import games.dmg.fantasystick.progression.ProgressionRules;
+import java.lang.reflect.Proxy;
+import java.util.UUID;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.function.Consumer;
+import org.bukkit.Location;
+import org.bukkit.World;
+import org.bukkit.entity.Item;
+import org.bukkit.entity.Player;
+import org.bukkit.event.entity.ItemSpawnEvent;
+import org.bukkit.event.player.PlayerDropItemEvent;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.util.Vector;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+/** Real native sheet data and API events; world insertion/player are explicit boundary doubles, not a live server. */
+class PlayerSheetDropsNativeTest {
+    @org.junit.jupiter.api.io.TempDir java.nio.file.Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test
+    void publishesOnePlayerDropEventBeforeNativeSpawningWithARealSavedSheetAndPlayerDropDefaults() {
+        var fixture = new WorldFixture();
+        var sheet = sheet();
+        var events = new AtomicInteger();
+        var drops = new PlayerSheetDrops(fixture.player, event -> {
+            events.incrementAndGet();
+            assertSame(fixture.player, event.getPlayer());
+            assertEquals(sheet, event.getItemDrop().getItemStack());
+            assertFalse(event.getItemDrop().isInWorld());
+            assertEquals(0, fixture.spawnCalls);
+        });
+        assertEquals(Status.COMPLETE, drops.drop(sheet, () -> true));
+        assertEquals(1, events.get());
+        assertEquals(1, fixture.spawnCalls);
+        assertEquals(1, fixture.spawnEvents);
+        assertEquals(sheet, fixture.stack);
+        assertEquals(fixture.playerId, fixture.thrower);
+        assertEquals(40, fixture.pickupDelay);
+        assertEquals(65.32, fixture.location.getY(), 0.00001);
+        assertTrue(Math.abs(fixture.velocity.getX()) <= .02);
+        assertTrue(fixture.velocity.getY() >= 0 && fixture.velocity.getY() <= .2);
+        assertTrue(fixture.velocity.getZ() >= .28 && fixture.velocity.getZ() <= .32);
+    }
+
+    @Test
+    void aCancelledPlayerDropNeverSpawnsOrUsesTheNativeInventoryReturnFallback() {
+        var fixture = new WorldFixture();
+        var drops = new PlayerSheetDrops(fixture.player, event -> event.setCancelled(true));
+        assertEquals(Status.CANCELLED, drops.drop(sheet(), () -> true));
+        assertEquals(1, fixture.creates);
+        assertEquals(0, fixture.spawnCalls);
+        assertEquals(0, fixture.spawnEvents);
+        assertFalse(fixture.inWorld);
+        // The player boundary rejects any getInventory/dropItem call: no cancelled sheet is inserted there.
+    }
+
+    @Test
+    void staleContextBeforeOrDuringThePlayerDropEventPreventsWorldInsertion() {
+        for (boolean staleInitially : new boolean[] {false, true}) {
+            var fixture = new WorldFixture();
+            var current = new java.util.concurrent.atomic.AtomicBoolean(!staleInitially);
+            var events = new AtomicInteger();
+            var drops = new PlayerSheetDrops(fixture.player, event -> { events.incrementAndGet(); current.set(false); });
+            assertEquals(Status.STALE, drops.drop(sheet(), current::get));
+            assertEquals(staleInitially ? 0 : 1, fixture.creates);
+            assertEquals(staleInitially ? 0 : 1, events.get());
+            assertEquals(0, fixture.spawnCalls);
+        }
+    }
+
+    @Test
+    void changedRemovedOrAlreadyPublishedEntitiesAreNotSpawnedAgainOrOverwritten() {
+        for (int scenario = 0; scenario < 4; scenario++) {
+            var fixture = new WorldFixture();
+            int mutation = scenario;
+            var drops = new PlayerSheetDrops(fixture.player, event -> {
+                if (mutation == 0) fixture.stack.setAmount(2);
+                if (mutation == 1) fixture.removed = true;
+                if (mutation == 2) { fixture.inWorld = true; event.setCancelled(true); }
+                if (mutation == 3) fixture.stack = sheet();
+            });
+            assertEquals(Status.UNCONFIRMED, drops.drop(sheet(), () -> true));
+            assertEquals(0, fixture.spawnCalls);
+            if (mutation == 0) assertEquals(2, fixture.stack.getAmount());
+            if (mutation == 2) assertTrue(fixture.inWorld);
+        }
+    }
+
+    @Test
+    void cancelledNativeSpawnsAndPostInsertionChangesAreUnconfirmedRatherThanSuccessfulDrops() {
+        for (int scenario = 0; scenario < 3; scenario++) {
+            var fixture = new WorldFixture();
+            if (scenario == 0) fixture.onSpawn = event -> event.setCancelled(true);
+            if (scenario == 1) fixture.onAdded = () -> fixture.removed = true;
+            if (scenario == 2) fixture.onAdded = () -> fixture.stack = new ItemStack(org.bukkit.Material.DIAMOND);
+            var drops = new PlayerSheetDrops(fixture.player, event -> { });
+            assertEquals(Status.UNCONFIRMED, drops.drop(sheet(), () -> true));
+            assertEquals(1, fixture.spawnCalls);
+            assertEquals(1, fixture.spawnEvents);
+            if (scenario == 0) assertFalse(fixture.inWorld);
+            if (scenario == 2) assertEquals(org.bukkit.Material.DIAMOND, fixture.stack.getType());
+        }
+    }
+
+    @Test
+    void rejectsNonSheetsAndWrongStackCountsBeforeAnyPublicCallback() {
+        var multiple = sheet();
+        multiple.setAmount(2);
+        for (var invalid : List.of(new ItemStack(org.bukkit.Material.PAPER), multiple)) {
+            var fixture = new WorldFixture();
+            var drops = new PlayerSheetDrops(fixture.player, event -> fail("Invalid sheet reached an event"));
+            assertThrows(IllegalArgumentException.class, () -> drops.drop(invalid, () -> true));
+            assertEquals(0, fixture.creates);
+        }
+    }
+
+    @Test
+    void realDispatcherCancellationFlowsThroughSavedDropExecutionWithoutChargingCancelledUnits() throws Exception {
+        var server = proxy(org.bukkit.Server.class, (name, args) -> switch (name) {
+            case "isPrimaryThread" -> true;
+            default -> throw new AssertionError("Unexpected server call " + name);
+        });
+        var dispatcher = new io.papermc.paper.plugin.manager.NativeEventDispatcher(server);
+        var plugin = proxy(org.bukkit.plugin.Plugin.class, (name, args) -> switch (name) {
+            case "isEnabled" -> true;
+            default -> throw new AssertionError("Unexpected plugin call " + name);
+        });
+        for (int mode = 0; mode < 3; mode++) {
+            var listener = new org.bukkit.event.Listener() { };
+            var trace = new java.util.ArrayList<String>();
+            int cancellation = mode;
+            PlayerDropItemEvent.getHandlerList().register(new org.bukkit.plugin.RegisteredListener(listener, (ignored, raw) -> {
+                trace.add("player-veto");
+                if (cancellation == 1) ((PlayerDropItemEvent) raw).setCancelled(true);
+            }, org.bukkit.event.EventPriority.HIGH, plugin, false));
+            PlayerDropItemEvent.getHandlerList().register(new org.bukkit.plugin.RegisteredListener(listener,
+                (ignored, raw) -> trace.add("player-allowed"), org.bukkit.event.EventPriority.HIGHEST, plugin, true));
+            ItemSpawnEvent.getHandlerList().register(new org.bukkit.plugin.RegisteredListener(listener, (ignored, raw) -> {
+                trace.add("spawn-veto");
+                if (cancellation == 2) ((ItemSpawnEvent) raw).setCancelled(true);
+            }, org.bukkit.event.EventPriority.HIGH, plugin, false));
+            ItemSpawnEvent.getHandlerList().register(new org.bukkit.plugin.RegisteredListener(listener,
+                (ignored, raw) -> trace.add("spawn-allowed"), org.bukkit.event.EventPriority.HIGHEST, plugin, true));
+            try {
+                var fixture = new WorldFixture();
+                fixture.onSpawn = dispatcher::accept;
+                var grid = new ManualCraftPlanNativeTest.Fixture(2, 2);
+                var plan = games.dmg.fantasystick.crafting.ManualCraftPlan.capture(grid.event(
+                    org.bukkit.event.inventory.ClickType.DROP, org.bukkit.event.inventory.InventoryAction.DROP_ONE_SLOT)).orElseThrow();
+                var record = new CharacterFactory().create(ProgressionRules.defaults());
+                try (var storage = new games.dmg.fantasystick.persistence.CharacterStorage(
+                        new games.dmg.fantasystick.persistence.YamlCharacterRepository(data), java.time.Clock.systemUTC())) {
+                    var attempt = storage.prepareCraft(List.of(record));
+                    var result = games.dmg.fantasystick.crafting.ManualDropDelivery.commit(plan, attempt.ready().join(),
+                        () -> grid.view, () -> true, new PlayerSheetDrops(fixture.player, dispatcher::accept));
+                    assertEquals(mode == 0 ? Status.COMPLETE : mode == 1 ? Status.CANCELLED : Status.UNCONFIRMED, result.status());
+                    assertEquals(mode == 0 ? 1 : 0, result.completed());
+                    assertEquals(mode == 0 ? 1 : 2, grid.grid.getMatrix()[0].getAmount());
+                    assertTrue(grid.view.getCursor().isEmpty());
+                    assertNull(grid.inventory.getItem(8));
+                    assertEquals(mode == 1 ? List.of("player-veto") : mode == 2 ? List.of("player-veto", "player-allowed", "spawn-veto")
+                        : List.of("player-veto", "player-allowed", "spawn-veto", "spawn-allowed"), trace);
+                    assertEquals(1, attempt.abandon().join().retained().size());
+                }
+            } finally {
+                org.bukkit.event.HandlerList.unregisterAll(listener);
+            }
+        }
+    }
+
+    @Test
+    void referenceStacksKeepIdentityAndUseOneDetachedEntityAtNativeCapacity() {
+        for (int amount : new int[]{1, 3, 64, 2}) {
+            var fixture = new WorldFixture();
+            var references = sheet();
+            if (amount == 2) {
+                var meta = references.getItemMeta(); meta.setMaxStackSize(2); references.setItemMeta(meta);
+            }
+            references.setAmount(amount);
+            var before = references.clone();
+            var identity = new CharacterSheets().identify(references).orElseThrow();
+            var events = new AtomicInteger();
+            var drops = new PlayerSheetDrops(fixture.player, event -> {
+                events.incrementAndGet();
+                assertEquals(before, event.getItemDrop().getItemStack());
+                assertFalse(event.getItemDrop().isInWorld());
+                assertEquals(0, fixture.spawnCalls);
+            });
+            assertEquals(Status.COMPLETE, drops.dropReferences(references, () -> true));
+            assertEquals(before, references, "Adapter never debits its caller's source");
+            assertEquals(before, fixture.stack);
+            assertEquals(identity, new CharacterSheets().identify(fixture.stack).orElseThrow());
+            assertEquals(1, events.get()); assertEquals(1, fixture.creates);
+            assertEquals(1, fixture.spawnCalls); assertEquals(1, fixture.spawnEvents);
+            assertEquals(40, fixture.pickupDelay); assertEquals(fixture.playerId, fixture.thrower);
+        }
+    }
+
+    @Test
+    void referenceStackValidationPrecedesAllCallbacksAndCraftContractStaysSingle() {
+        var oversized = sheet(); oversized.setAmount(oversized.getMaxStackSize() + 1);
+        var limited = sheet(); var meta = limited.getItemMeta(); meta.setMaxStackSize(2); limited.setItemMeta(meta); limited.setAmount(3);
+        var empty = sheet(); empty.setAmount(0);
+        var negative = sheet(); negative.setAmount(-1);
+        for (var invalid : java.util.Arrays.asList(null, new ItemStack(org.bukkit.Material.PAPER),
+                new ItemStack(org.bukkit.Material.DIAMOND), empty, negative, oversized, limited)) {
+            var fixture = new WorldFixture();
+            var drops = new PlayerSheetDrops(fixture.player, event -> fail("Invalid references reached the public callback"));
+            assertThrows(IllegalArgumentException.class, () -> drops.dropReferences(invalid, () -> {
+                fail("Validate before even consulting context"); return true;
+            }));
+            assertEquals(0, fixture.creates); assertEquals(0, fixture.spawnCalls);
+        }
+        var fixture = new WorldFixture();
+        games.dmg.fantasystick.crafting.ManualDropDelivery.DropTarget strict = new PlayerSheetDrops(fixture.player,
+            event -> fail("Crafting DropTarget must remain exactly one sheet"));
+        var references = sheet(); references.setAmount(3);
+        assertThrows(IllegalArgumentException.class, () -> strict.drop(references, () -> {
+            fail("Reject multiple crafting sheets before any callback"); return true;
+        }));
+        assertEquals(0, fixture.creates);
+    }
+
+    @Test
+    void referenceStacksRetainSingleSheetStalenessAndUncertaintySemantics() {
+        for (int scenario = 0; scenario < 9; scenario++) {
+            var fixture = new WorldFixture(); var references = sheet(); references.setAmount(3);
+            var before = references.clone();
+            var current = new java.util.concurrent.atomic.AtomicBoolean(scenario != 0);
+            var events = new AtomicInteger();
+            int change = scenario;
+            var drops = new PlayerSheetDrops(fixture.player, event -> {
+                events.incrementAndGet();
+                if (change == 1) event.setCancelled(true);
+                if (change == 2) current.set(false);
+                if (change == 3) fixture.stack.setAmount(1);
+                if (change == 4) fixture.removed = true;
+                if (change == 5) { fixture.inWorld = true; event.setCancelled(true); }
+            });
+            if (scenario == 6) fixture.onSpawn = event -> event.setCancelled(true);
+            if (scenario == 7) fixture.onAdded = () -> fixture.stack.setAmount(1);
+            if (scenario == 8) fixture.onAdded = () -> fixture.removed = true;
+            assertEquals(scenario == 0 || scenario == 2 ? Status.STALE : scenario == 1 ? Status.CANCELLED : Status.UNCONFIRMED,
+                drops.dropReferences(references, current::get), "Scenario " + scenario);
+            assertEquals(before, references);
+            assertEquals(scenario == 0 ? 0 : 1, events.get());
+            assertEquals(scenario >= 6 ? 1 : 0, fixture.spawnCalls);
+            assertEquals(scenario >= 6 ? 1 : 0, fixture.spawnEvents);
+            if (scenario != 0) assertEquals(new CharacterSheets().identify(before), new CharacterSheets().identify(fixture.stack));
+        }
+    }
+
+    private static ItemStack sheet() {
+        return new CharacterSheets().create(new CharacterFactory().create(ProgressionRules.defaults()));
+    }
+
+    static final class WorldFixture {
+        final UUID playerId = UUID.randomUUID();
+        final World world;
+        final Player player;
+        final Item item;
+        ItemStack stack;
+        Location location;
+        Vector velocity;
+        UUID thrower;
+        int pickupDelay;
+        int creates;
+        int spawnCalls;
+        int spawnEvents;
+        boolean inWorld;
+        boolean removed;
+        Consumer<ItemSpawnEvent> onSpawn = event -> { };
+        Runnable onAdded = () -> { };
+
+        WorldFixture() {
+            item = proxy(Item.class, (name, args) -> switch (name) {
+                case "setItemStack" -> { stack = ((ItemStack) args[0]).clone(); yield null; }
+                case "getItemStack" -> stack.clone();
+                case "setPickupDelay" -> { pickupDelay = (int) args[0]; yield null; }
+                case "setThrower" -> { thrower = (UUID) args[0]; yield null; }
+                case "setVelocity" -> { velocity = ((Vector) args[0]).clone(); yield null; }
+                case "getLocation" -> location.clone();
+                case "isInWorld", "isValid" -> inWorld && !removed;
+                case "isDead" -> removed;
+                case "spawnAt" -> {
+                    spawnCalls++;
+                    assertEquals(org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.CUSTOM, args[1]);
+                    var event = new ItemSpawnEvent(argsItem());
+                    spawnEvents++;
+                    onSpawn.accept(event);
+                    if (event.isCancelled() || removed) { removed = true; yield false; }
+                    inWorld = true;
+                    onAdded.run();
+                    yield true;
+                }
+                default -> throw new AssertionError("Unexpected item call " + name);
+            });
+            world = proxy(World.class, (name, args) -> switch (name) {
+                case "createEntity" -> {
+                    creates++;
+                    assertEquals(Item.class, args[1]);
+                    location = ((Location) args[0]).clone();
+                    returnItemUnspawned();
+                    yield item;
+                }
+                default -> throw new AssertionError("Unexpected world call " + name);
+            });
+            player = proxy(Player.class, (name, args) -> switch (name) {
+                case "getUniqueId" -> playerId;
+                case "getEyeLocation" -> new Location(world, 10, 65.62, 10, 0, 0);
+                default -> throw new AssertionError("Unexpected player call " + name);
+            });
+        }
+
+        private Item argsItem() { return item; }
+        private void returnItemUnspawned() { inWorld = false; removed = false; }
+    }
+
+    @FunctionalInterface
+    private interface Call { Object invoke(String name, Object[] args); }
+
+    private static <T> T proxy(Class<T> type, Call call) {
+        return type.cast(Proxy.newProxyInstance(type.getClassLoader(), new Class<?>[] {type}, (object, method, args) -> {
+            if (method.getDeclaringClass() == Object.class) return switch (method.getName()) {
+                case "equals" -> object == args[0];
+                case "hashCode" -> System.identityHashCode(object);
+                case "toString" -> "Boundary fixture " + type.getSimpleName();
+                default -> throw new AssertionError(method.getName());
+            };
+            return call.invoke(method.getName(), args);
+        }));
+    }
+}

src/nativeTest/java/games/dmg/fantasystick/ReviveNativeTest.java

@@ -0,0 +1,404 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.math.BigInteger;
+import java.nio.file.Path;
+import java.time.Duration;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class ReviveNativeTest {
+    @TempDir Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test void completedProgressionBudgetCanLearnAndAssignReviveWithoutALevelGate() throws Exception {
+        try (var fixture = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            var actor = new FantasyStickLifecycleNativeTest.Actor(data);
+            var repository = new games.dmg.fantasystick.persistence.YamlCharacterRepository(data);
+            try (var storage = new games.dmg.fantasystick.persistence.CharacterStorage(repository, java.time.Clock.systemUTC())) {
+                var current = storage.awardExperience(actor.core.record.id(), actor.core.record.revision(),
+                    BigInteger.valueOf(2700), games.dmg.fantasystick.progression.ProgressionRules.defaults()).join().record().orElseThrow();
+                for (var purchase : java.util.List.of(
+                        java.util.Map.entry(games.dmg.fantasystick.progression.Stat.WIS, 30),
+                        java.util.Map.entry(games.dmg.fantasystick.progression.Stat.CHR, 24),
+                        java.util.Map.entry(games.dmg.fantasystick.progression.Stat.CON, 12))) {
+                    for (int count = 0; count < purchase.getValue(); count++) {
+                        current = storage.purchaseStat(current.id(), current.revision(), purchase.getKey(), current.health(),
+                            new java.math.BigDecimal("1024")).join().record().orElseThrow();
+                    }
+                }
+                assertEquals(28, current.level()); assertEquals(BigInteger.ONE, current.unspentPoints());
+            }
+            fixture.plugin.setEnabled(true); fixture.players.put(actor.core.id, actor.player); fixture.activate(actor);
+            actor.core.inventory.getInventory().setSelectedSlot(0); PartyBookNativeTest.open(fixture, actor);
+            String text = PartyBookNativeTest.text(actor).replaceAll("\\s+", "");
+            assertTrue(text.contains("Revive")); assertTrue(text.contains("WIS30")); assertTrue(text.contains("CHR24"));
+            assertTrue(text.contains("CON12")); assertTrue(text.contains("Cooldown:86400s"));
+            PartyBookNativeTest.click(fixture, actor, PartyBookNativeTest.button(actor, "[Learn]"));
+            PartyBookNativeTest.drain(fixture); PartyBookNativeTest.drain(fixture);
+            PartyBookNativeTest.click(fixture, actor, PartyBookNativeTest.button(actor, "[3]"));
+            PartyBookNativeTest.drain(fixture); PartyBookNativeTest.drain(fixture);
+            var storage = (games.dmg.fantasystick.persistence.CharacterStorage)
+                FantasyStickLifecycleNativeTest.Fixture.field(fixture.plugin, "characters");
+            var saved = storage.find(actor.core.record.id()).get().orElseThrow();
+            assertTrue(saved.learned().contains("revive")); assertEquals("revive", saved.loadout().getFirst());
+            assertEquals(BigInteger.ZERO, saved.unspentPoints());
+            assertEquals(org.bukkit.Material.ECHO_SHARD, actor.core.inventory.getItem(2).getType());
+        }
+    }
+
+    @Test void ordinaryTargetSelectsOneTailAndReceivesTheSameLivingSheetOnce() throws Exception {
+        try (var fixture = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            fixture.plugin.setEnabled(true);
+            var caster = new FantasyStickLifecycleNativeTest.Actor(data); withRevive(data, caster);
+            var target = new FantasyStickLifecycleNativeTest.Actor(data);
+            fixture.players.put(caster.core.id, caster.player); fixture.players.put(target.core.id, target.player);
+            fixture.activate(caster);
+            assertTrue(((games.dmg.fantasystick.session.EquipmentSessions)
+                FantasyStickLifecycleNativeTest.Fixture.field(fixture.plugin, "sessions")).active(target.core.id).isEmpty());
+
+            var original = new games.dmg.fantasystick.crafting.CharacterFactory().create(
+                games.dmg.fantasystick.progression.ProgressionRules.defaults());
+            var death = java.util.UUID.randomUUID();
+            var died = java.time.Instant.now().minusSeconds(3600).truncatedTo(java.time.temporal.ChronoUnit.SECONDS);
+            var dead = new games.dmg.fantasystick.persistence.CharacterRecord(original.id(), "Fallen Mira", original.revision(),
+                original.stats(), 7, BigInteger.valueOf(642), BigInteger.valueOf(11), java.math.BigDecimal.ZERO,
+                java.util.Set.of("fireball"), java.util.List.of("fireball", "", "", "", "", "", ""),
+                java.util.Map.of("fireball", java.time.Instant.now().plusSeconds(30)), original.restrictedKills(), true, death, died);
+            new games.dmg.fantasystick.persistence.YamlCharacterRepository(data).create(dead);
+            var tail = new games.dmg.fantasystick.items.TailBooks().create(dead);
+            var copiedStack = tail.clone(); copiedStack.setAmount(2); target.core.inventory.setItem(10, copiedStack);
+
+            caster.core.location.setWorld(caster.world); caster.core.location.setX(0); caster.core.location.setY(64); caster.core.location.setZ(0);
+            target.core.location.setWorld(caster.world); target.core.location.setX(3); target.core.location.setY(64); target.core.location.setZ(0);
+            var eye = new org.bukkit.Location(caster.world, 0, 65.6, 0); eye.setDirection(new org.bukkit.util.Vector(1, 0, 0));
+            org.mockito.Mockito.doReturn(eye).when(caster.player).getEyeLocation();
+            org.mockito.Mockito.doReturn(true).when(caster.player).hasLineOfSight(target.player);
+            caster.core.inventory.getInventory().setSelectedSlot(2);
+            fixture.dispatcher.accept(new org.bukkit.event.player.PlayerInteractEntityEvent(caster.player, target.player,
+                org.bukkit.inventory.EquipmentSlot.HAND));
+            PartyBookNativeTest.drain(fixture); PartyBookNativeTest.drain(fixture);
+            assertEquals(1, target.inventories.size());
+            var popup = target.inventories.getFirst();
+            assertEquals(1, java.util.stream.IntStream.range(0, popup.getSize()).filter(slot -> {
+                var item = popup.getItem(slot); return item != null && item.getType() == org.bukkit.Material.WRITTEN_BOOK;
+            }).count());
+            var view = org.mockito.Mockito.mock(org.bukkit.inventory.InventoryView.class);
+            org.mockito.Mockito.when(view.getTopInventory()).thenReturn(popup);
+            org.mockito.Mockito.when(view.getBottomInventory()).thenReturn(target.core.inventory);
+            org.mockito.Mockito.when(view.getPlayer()).thenReturn(target.player);
+            var selection = new org.bukkit.event.inventory.InventoryClickEvent(view,
+                org.bukkit.event.inventory.InventoryType.SlotType.CONTAINER, 0, org.bukkit.event.inventory.ClickType.LEFT,
+                org.bukkit.event.inventory.InventoryAction.PICKUP_ALL);
+            fixture.dispatcher.accept(selection); assertTrue(selection.isCancelled(), "Popup copies cannot be exported");
+            var revivalStore = (games.dmg.fantasystick.persistence.RevivalStore)
+                FantasyStickLifecycleNativeTest.Fixture.field(fixture.plugin, "revivals");
+            PartyBookNativeTest.drain(fixture);
+            assertTrue(revivalStore.find(dead.id()).join().isPresent());
+            PartyBookNativeTest.drain(fixture); PartyBookNativeTest.drain(fixture);
+
+            var storage = (games.dmg.fantasystick.persistence.CharacterStorage)
+                FantasyStickLifecycleNativeTest.Fixture.field(fixture.plugin, "characters");
+            var restored = storage.find(dead.id()).get().orElseThrow();
+            assertFalse(restored.dead(), "caster=" + caster.messages + ", target=" + target.messages + ", source=" + target.core.inventory.getItem(10)
+                + ", reservation=" + revivalStore.find(dead.id()).join());
+            assertEquals(dead.id(), restored.id()); assertEquals(dead.name(), restored.name());
+            assertEquals(dead.stats(), restored.stats()); assertEquals(dead.level(), restored.level());
+            assertEquals(dead.experience(), restored.experience()); assertEquals(dead.unspentPoints(), restored.unspentPoints());
+            assertEquals(dead.learned(), restored.learned()); assertEquals(dead.loadout(), restored.loadout());
+            assertEquals(dead.cooldowns(), restored.cooldowns()); assertEquals(restored.maximumHealth(), restored.health());
+            assertEquals(dead.id(), new games.dmg.fantasystick.items.CharacterSheets()
+                .identify(target.core.inventory.getItem(1)).orElseThrow());
+            assertEquals(1, target.core.inventory.getItem(10).getAmount());
+            assertEquals(new games.dmg.fantasystick.items.TailBooks.Identity(dead.id(), dead.deathId()),
+                new games.dmg.fantasystick.items.TailBooks().identify(target.core.inventory.getItem(10)).orElseThrow());
+            assertTrue(((games.dmg.fantasystick.session.EquipmentSessions)
+                FantasyStickLifecycleNativeTest.Fixture.field(fixture.plugin, "sessions")).active(target.core.id).isEmpty());
+            fixture.dispatcher.accept(new org.bukkit.event.inventory.InventoryClickEvent(view,
+                org.bukkit.event.inventory.InventoryType.SlotType.CONTAINER, 0, org.bukkit.event.inventory.ClickType.LEFT,
+                org.bukkit.event.inventory.InventoryAction.PICKUP_ALL));
+            assertEquals(dead.id(), new games.dmg.fantasystick.items.CharacterSheets()
+                .identify(target.core.inventory.getItem(1)).orElseThrow());
+            assertTrue(storage.find(caster.core.record.id()).get().orElseThrow().cooldowns().get("revive")
+                .isAfter(java.time.Instant.now().plusSeconds(86300)));
+        }
+    }
+
+    @Test void stackedTailWithNoSafeSheetDestinationChangesNothingAndKeepsTheCooldown() throws Exception {
+        try (var fixture = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            fixture.plugin.setEnabled(true);
+            var caster = new FantasyStickLifecycleNativeTest.Actor(data); withRevive(data, caster);
+            var target = new FantasyStickLifecycleNativeTest.Actor(data);
+            fixture.players.put(caster.core.id, caster.player); fixture.players.put(target.core.id, target.player); fixture.activate(caster);
+            var base = new games.dmg.fantasystick.crafting.CharacterFactory().create(
+                games.dmg.fantasystick.progression.ProgressionRules.defaults());
+            var death = java.util.UUID.randomUUID(); var died = java.time.Instant.now().minusSeconds(60).truncatedTo(java.time.temporal.ChronoUnit.SECONDS);
+            var dead = new games.dmg.fantasystick.persistence.CharacterRecord(base.id(), "Full inventory", base.revision(), base.stats(),
+                base.level(), base.experience(), base.unspentPoints(), java.math.BigDecimal.ZERO, base.learned(), base.loadout(),
+                base.cooldowns(), base.restrictedKills(), true, death, died);
+            new games.dmg.fantasystick.persistence.YamlCharacterRepository(data).create(dead);
+            for (int slot = 0; slot <= 40; slot++) if (slot <= 35 || slot == 40) {
+                target.core.inventory.setItem(slot, new org.bukkit.inventory.ItemStack(org.bukkit.Material.STONE));
+            }
+            var tail = new games.dmg.fantasystick.items.TailBooks().create(dead); tail.setAmount(2); target.core.inventory.setItem(10, tail);
+            caster.core.location.setWorld(caster.world); caster.core.location.setY(64);
+            target.core.location.setWorld(caster.world); target.core.location.setX(3); target.core.location.setY(64);
+            org.mockito.Mockito.doReturn(new org.bukkit.Location(caster.world, 0, 65.6, 0)).when(caster.player).getEyeLocation();
+            org.mockito.Mockito.doReturn(true).when(caster.player).hasLineOfSight(target.player);
+            caster.core.inventory.getInventory().setSelectedSlot(2);
+            fixture.dispatcher.accept(new org.bukkit.event.player.PlayerInteractEntityEvent(caster.player, target.player,
+                org.bukkit.inventory.EquipmentSlot.HAND));
+            PartyBookNativeTest.drain(fixture); PartyBookNativeTest.drain(fixture);
+            var popup = target.inventories.getFirst(); var view = org.mockito.Mockito.mock(org.bukkit.inventory.InventoryView.class);
+            org.mockito.Mockito.when(view.getTopInventory()).thenReturn(popup);
+            org.mockito.Mockito.when(view.getBottomInventory()).thenReturn(target.core.inventory);
+            org.mockito.Mockito.when(view.getPlayer()).thenReturn(target.player);
+            fixture.dispatcher.accept(new org.bukkit.event.inventory.InventoryClickEvent(view,
+                org.bukkit.event.inventory.InventoryType.SlotType.CONTAINER, 0, org.bukkit.event.inventory.ClickType.LEFT,
+                org.bukkit.event.inventory.InventoryAction.PICKUP_ALL));
+            PartyBookNativeTest.drain(fixture);
+            assertEquals(tail, target.core.inventory.getItem(10));
+            assertTrue(((games.dmg.fantasystick.persistence.CharacterStorage)
+                FantasyStickLifecycleNativeTest.Fixture.field(fixture.plugin, "characters")).find(dead.id()).get().orElseThrow().dead());
+            assertTrue(((games.dmg.fantasystick.persistence.RevivalStore)
+                FantasyStickLifecycleNativeTest.Fixture.field(fixture.plugin, "revivals")).find(dead.id()).join().isEmpty());
+            assertTrue(target.messages.stream().anyMatch(message -> message.contains("empty direct inventory slot")));
+            assertNotNull(((games.dmg.fantasystick.persistence.CharacterStorage)
+                FantasyStickLifecycleNativeTest.Fixture.field(fixture.plugin, "characters"))
+                .find(caster.core.record.id()).get().orElseThrow().cooldowns().get("revive"));
+        }
+    }
+
+    @Test void confirmationRechecksTheExactTwentyFourHourBoundaryBeforeChangingTheTail() throws Exception {
+        try (var fixture = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            fixture.plugin.setEnabled(true);
+            var caster = new FantasyStickLifecycleNativeTest.Actor(data); withRevive(data, caster);
+            var target = new FantasyStickLifecycleNativeTest.Actor(data);
+            fixture.players.put(caster.core.id, caster.player); fixture.players.put(target.core.id, target.player); fixture.activate(caster);
+            var base = new games.dmg.fantasystick.crafting.CharacterFactory().create(
+                games.dmg.fantasystick.progression.ProgressionRules.defaults());
+            var death = java.util.UUID.randomUUID(); var recent = java.time.Instant.now().minusSeconds(60).truncatedTo(java.time.temporal.ChronoUnit.SECONDS);
+            var dead = new games.dmg.fantasystick.persistence.CharacterRecord(base.id(), "Boundary", base.revision(), base.stats(),
+                base.level(), base.experience(), base.unspentPoints(), java.math.BigDecimal.ZERO, base.learned(), base.loadout(),
+                base.cooldowns(), base.restrictedKills(), true, death, recent);
+            var repository = new games.dmg.fantasystick.persistence.YamlCharacterRepository(data); repository.create(dead);
+            var tail = new games.dmg.fantasystick.items.TailBooks().create(dead); target.core.inventory.setItem(10, tail);
+            caster.core.location.setWorld(caster.world); caster.core.location.setY(64);
+            target.core.location.setWorld(caster.world); target.core.location.setX(3); target.core.location.setY(64);
+            var eye = new org.bukkit.Location(caster.world, 0, 65.6, 0);
+            org.mockito.Mockito.doReturn(eye).when(caster.player).getEyeLocation();
+            org.mockito.Mockito.doReturn(true).when(caster.player).hasLineOfSight(target.player);
+            caster.core.inventory.getInventory().setSelectedSlot(2);
+            fixture.dispatcher.accept(new org.bukkit.event.player.PlayerInteractEntityEvent(caster.player, target.player,
+                org.bukkit.inventory.EquipmentSlot.HAND));
+            PartyBookNativeTest.drain(fixture); PartyBookNativeTest.drain(fixture);
+            var popup = target.inventories.getFirst();
+            var expired = new games.dmg.fantasystick.persistence.CharacterRecord(dead.id(), dead.name(), dead.revision().add(BigInteger.ONE),
+                dead.stats(), dead.level(), dead.experience(), dead.unspentPoints(), dead.health(), dead.learned(), dead.loadout(),
+                dead.cooldowns(), dead.restrictedKills(), true, dead.deathId(),
+                java.time.Instant.now().minusSeconds(86400).truncatedTo(java.time.temporal.ChronoUnit.SECONDS));
+            repository.replace(expired, dead.revision());
+            var view = org.mockito.Mockito.mock(org.bukkit.inventory.InventoryView.class);
+            org.mockito.Mockito.when(view.getTopInventory()).thenReturn(popup);
+            org.mockito.Mockito.when(view.getBottomInventory()).thenReturn(target.core.inventory);
+            org.mockito.Mockito.when(view.getPlayer()).thenReturn(target.player);
+            fixture.dispatcher.accept(new org.bukkit.event.inventory.InventoryClickEvent(view,
+                org.bukkit.event.inventory.InventoryType.SlotType.CONTAINER, 0, org.bukkit.event.inventory.ClickType.LEFT,
+                org.bukkit.event.inventory.InventoryAction.PICKUP_ALL));
+            PartyBookNativeTest.drain(fixture);
+            assertEquals(tail, target.core.inventory.getItem(10));
+            assertTrue(((games.dmg.fantasystick.persistence.CharacterStorage)
+                FantasyStickLifecycleNativeTest.Fixture.field(fixture.plugin, "characters")).find(dead.id()).get().orElseThrow().dead());
+            assertTrue(((games.dmg.fantasystick.persistence.RevivalStore)
+                FantasyStickLifecycleNativeTest.Fixture.field(fixture.plugin, "revivals")).find(dead.id()).join().isEmpty());
+            assertTrue(caster.messages.stream().anyMatch(message -> message.contains("no longer eligible")));
+        }
+    }
+
+    @Test void eyeRayRequiresAValidTargetAndEmptyResultStillConsumesTheDailyCooldown() throws Exception {
+        try (var fixture = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            fixture.plugin.setEnabled(true);
+            var caster = new FantasyStickLifecycleNativeTest.Actor(data); withRevive(data, caster);
+            var target = new FantasyStickLifecycleNativeTest.Actor(data);
+            fixture.players.put(caster.core.id, caster.player); fixture.players.put(target.core.id, target.player);
+            fixture.activate(caster);
+            caster.core.location.setWorld(caster.world); caster.core.location.setY(64);
+            target.core.location.setWorld(caster.world); target.core.location.setX(12); target.core.location.setY(64);
+            var eye = new org.bukkit.Location(caster.world, 0, 65.6, 0); eye.setDirection(new org.bukkit.util.Vector(1, 0, 0));
+            org.mockito.Mockito.doReturn(eye).when(caster.player).getEyeLocation();
+            org.mockito.Mockito.doReturn(true).when(caster.player).hasLineOfSight(target.player);
+            caster.core.inventory.getInventory().setSelectedSlot(2);
+            var use = new org.bukkit.event.player.PlayerInteractEvent(caster.player, org.bukkit.event.block.Action.RIGHT_CLICK_AIR,
+                caster.core.inventory.getItem(2), null, org.bukkit.block.BlockFace.SELF, org.bukkit.inventory.EquipmentSlot.HAND);
+            fixture.dispatcher.accept(use);
+            var storage = (games.dmg.fantasystick.persistence.CharacterStorage)
+                FantasyStickLifecycleNativeTest.Fixture.field(fixture.plugin, "characters");
+            assertFalse(storage.find(caster.core.record.id()).get().orElseThrow().cooldowns().containsKey("revive"));
+
+            org.mockito.Mockito.doReturn(new org.bukkit.util.RayTraceResult(new org.bukkit.util.Vector(12, 65, 0), target.player))
+                .when(caster.world).rayTraceEntities(org.mockito.ArgumentMatchers.any(org.bukkit.Location.class),
+                    org.mockito.ArgumentMatchers.any(org.bukkit.util.Vector.class), org.mockito.ArgumentMatchers.eq(12.0),
+                    org.mockito.ArgumentMatchers.<java.util.function.Predicate<org.bukkit.entity.Entity>>any());
+            fixture.dispatcher.accept(new org.bukkit.event.player.PlayerInteractEvent(caster.player,
+                org.bukkit.event.block.Action.RIGHT_CLICK_AIR, caster.core.inventory.getItem(2), null,
+                org.bukkit.block.BlockFace.SELF, org.bukkit.inventory.EquipmentSlot.HAND));
+            PartyBookNativeTest.drain(fixture); PartyBookNativeTest.drain(fixture);
+            assertTrue(storage.find(caster.core.record.id()).get().orElseThrow().cooldowns().get("revive")
+                .isAfter(java.time.Instant.now().plusSeconds(86300)));
+            assertTrue(caster.messages.stream().anyMatch(message -> message.contains("no direct-inventory Tail")));
+            assertTrue(target.inventories.isEmpty());
+        }
+    }
+
+    @Test void unlearningDuringFantasyTargetPopupCancelsSelectionWithoutResettingDailyDeadline() throws Exception {
+        try (var fixture = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            fixture.plugin.setEnabled(true);
+            var caster = new FantasyStickLifecycleNativeTest.Actor(data); withRevive(data, caster);
+            var target = new FantasyStickLifecycleNativeTest.Actor(data);
+            fixture.players.put(caster.core.id, caster.player); fixture.players.put(target.core.id, target.player);
+            fixture.activate(caster); fixture.activate(target);
+            var base = new games.dmg.fantasystick.crafting.CharacterFactory().create(
+                games.dmg.fantasystick.progression.ProgressionRules.defaults());
+            var death = java.util.UUID.randomUUID(); var died = java.time.Instant.now().minusSeconds(60).truncatedTo(java.time.temporal.ChronoUnit.SECONDS);
+            var dead = new games.dmg.fantasystick.persistence.CharacterRecord(base.id(), "Pending", base.revision(), base.stats(),
+                base.level(), base.experience(), base.unspentPoints(), java.math.BigDecimal.ZERO, base.learned(), base.loadout(),
+                base.cooldowns(), base.restrictedKills(), true, death, died);
+            new games.dmg.fantasystick.persistence.YamlCharacterRepository(data).create(dead);
+            var tail = new games.dmg.fantasystick.items.TailBooks().create(dead); target.core.inventory.setItem(10, tail);
+            caster.core.location.setWorld(caster.world); caster.core.location.setY(64);
+            target.core.location.setWorld(caster.world); target.core.location.setX(3); target.core.location.setY(64);
+            var eye = new org.bukkit.Location(caster.world, 0, 65.6, 0);
+            org.mockito.Mockito.doReturn(eye).when(caster.player).getEyeLocation();
+            org.mockito.Mockito.doReturn(true).when(caster.player).hasLineOfSight(target.player);
+            caster.core.inventory.getInventory().setSelectedSlot(2);
+            fixture.dispatcher.accept(new org.bukkit.event.player.PlayerInteractEntityEvent(caster.player, target.player,
+                org.bukkit.inventory.EquipmentSlot.HAND));
+            PartyBookNativeTest.drain(fixture); PartyBookNativeTest.drain(fixture);
+            assertEquals(1, target.inventories.size()); var popup = target.inventories.getFirst();
+            assertTrue(fixture.delayedTicks.contains(6000L), "The popup expires at exactly five real-time minutes");
+            var view = org.mockito.Mockito.mock(org.bukkit.inventory.InventoryView.class);
+            org.mockito.Mockito.when(view.getTopInventory()).thenReturn(popup);
+            org.mockito.Mockito.when(view.getBottomInventory()).thenReturn(target.core.inventory);
+            org.mockito.Mockito.when(view.getPlayer()).thenReturn(target.player);
+
+            caster.core.inventory.getInventory().setSelectedSlot(0); PartyBookNativeTest.open(fixture, caster);
+            PartyBookNativeTest.click(fixture, caster, PartyBookNativeTest.button(caster, "[Unlearn]"));
+            PartyBookNativeTest.drain(fixture); PartyBookNativeTest.drain(fixture);
+            var storage = (games.dmg.fantasystick.persistence.CharacterStorage)
+                FantasyStickLifecycleNativeTest.Fixture.field(fixture.plugin, "characters");
+            var refunded = storage.find(caster.core.record.id()).get().orElseThrow();
+            var deadline = refunded.cooldowns().get("revive"); assertNotNull(deadline); assertFalse(refunded.learned().contains("revive"));
+            assertTrue(java.util.stream.IntStream.range(0, popup.getSize()).allMatch(slot -> popup.getItem(slot) == null));
+            fixture.dispatcher.accept(new org.bukkit.event.inventory.InventoryClickEvent(view,
+                org.bukkit.event.inventory.InventoryType.SlotType.CONTAINER, 0, org.bukkit.event.inventory.ClickType.LEFT,
+                org.bukkit.event.inventory.InventoryAction.PICKUP_ALL));
+            assertTrue(storage.find(dead.id()).get().orElseThrow().dead()); assertEquals(tail, target.core.inventory.getItem(10));
+
+            PartyBookNativeTest.click(fixture, caster, PartyBookNativeTest.button(caster, "[Learn]"));
+            PartyBookNativeTest.drain(fixture); PartyBookNativeTest.drain(fixture);
+            PartyBookNativeTest.click(fixture, caster, PartyBookNativeTest.button(caster, "[3]"));
+            PartyBookNativeTest.drain(fixture); PartyBookNativeTest.drain(fixture);
+            caster.core.inventory.getInventory().setSelectedSlot(2);
+            fixture.dispatcher.accept(new org.bukkit.event.player.PlayerInteractEntityEvent(caster.player, target.player,
+                org.bukkit.inventory.EquipmentSlot.HAND));
+            PartyBookNativeTest.drain(fixture);
+            assertEquals(1, target.inventories.size(), "Relearning cannot bypass the original daily deadline");
+            assertEquals(deadline, storage.find(caster.core.record.id()).get().orElseThrow().cooldowns().get("revive"));
+
+            var transferred = caster.core.inventory.getItemInOffHand().clone();
+            caster.core.inventory.setItemInOffHand(null); fixture.changed(caster);
+            PartyBookNativeTest.drain(fixture); fixture.awaitCharacterAndReceipt(caster);
+            var current = storage.find(caster.core.record.id()).get().orElseThrow();
+            var renamed = storage.renameCharacter(current.id(), "Renamed daily caster").get().orElseThrow();
+            var nextHolder = new FantasyStickLifecycleNativeTest.Actor(data); nextHolder.core.inventory.setItemInOffHand(transferred);
+            fixture.players.put(nextHolder.core.id, nextHolder.player); fixture.activate(nextHolder);
+            nextHolder.core.inventory.getInventory().setSelectedSlot(2);
+            fixture.dispatcher.accept(new org.bukkit.event.player.PlayerInteractEntityEvent(nextHolder.player, target.player,
+                org.bukkit.inventory.EquipmentSlot.HAND));
+            PartyBookNativeTest.drain(fixture);
+            assertTrue(nextHolder.messages.stream().anyMatch(message -> message.contains("ready in")));
+            assertEquals("Renamed daily caster", renamed.name()); assertEquals(deadline, renamed.cooldowns().get("revive"));
+        }
+    }
+
+    @Test void startupReconciliationCompletesOnlyAProvedDeliveredSheetAndClearsAnUnchangedTail() throws Exception {
+        var target = new FantasyStickLifecycleNativeTest.Actor(data); target.core.inventory.setItemInOffHand(null);
+        var repository = new games.dmg.fantasystick.persistence.YamlCharacterRepository(data);
+        var base = new games.dmg.fantasystick.crafting.CharacterFactory().create(
+            games.dmg.fantasystick.progression.ProgressionRules.defaults());
+        var death = java.util.UUID.randomUUID(); var died = java.time.Instant.now().minusSeconds(60).truncatedTo(java.time.temporal.ChronoUnit.SECONDS);
+        var dead = new games.dmg.fantasystick.persistence.CharacterRecord(base.id(), "Interrupted", base.revision(), base.stats(),
+            base.level(), base.experience(), base.unspentPoints(), java.math.BigDecimal.ZERO, base.learned(), base.loadout(),
+            base.cooldowns(), base.restrictedKills(), true, death, died);
+        repository.create(dead);
+        var provisional = new games.dmg.fantasystick.persistence.CharacterRecord(dead.id(), dead.name(), dead.revision(), dead.stats(),
+            dead.level(), dead.experience(), dead.unspentPoints(), dead.maximumHealth(), dead.learned(), dead.loadout(),
+            dead.cooldowns(), dead.restrictedKills(), false, dead.deathId(), dead.diedAt());
+        target.core.inventory.setItem(10, new games.dmg.fantasystick.items.CharacterSheets().create(provisional));
+        var reservation = new games.dmg.fantasystick.persistence.RevivalStore.Reservation(java.util.UUID.randomUUID(),
+            java.util.UUID.randomUUID(), target.core.id, dead.id(), death, java.time.Instant.now().truncatedTo(java.time.temporal.ChronoUnit.SECONDS),
+            10, 1, -1);
+        try (var store = new games.dmg.fantasystick.persistence.RevivalStore(data)) { store.reserve(reservation).join(); }
+
+        try (var fixture = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            fixture.players.put(target.core.id, target.player); fixture.plugin.setEnabled(true);
+            var store = (games.dmg.fantasystick.persistence.RevivalStore)
+                FantasyStickLifecycleNativeTest.Fixture.field(fixture.plugin, "revivals");
+            store.target(target.core.id).join(); PartyBookNativeTest.drain(fixture); PartyBookNativeTest.drain(fixture);
+            var storage = (games.dmg.fantasystick.persistence.CharacterStorage)
+                FantasyStickLifecycleNativeTest.Fixture.field(fixture.plugin, "characters");
+            assertFalse(storage.find(dead.id()).get().orElseThrow().dead());
+            assertTrue(store.find(dead.id()).join().isEmpty());
+            assertEquals(dead.id(), new games.dmg.fantasystick.items.CharacterSheets()
+                .identify(target.core.inventory.getItem(10)).orElseThrow());
+
+            var secondBase = new games.dmg.fantasystick.crafting.CharacterFactory().create(
+                games.dmg.fantasystick.progression.ProgressionRules.defaults());
+            var secondDeath = java.util.UUID.randomUUID();
+            var second = new games.dmg.fantasystick.persistence.CharacterRecord(secondBase.id(), "Not delivered", secondBase.revision(),
+                secondBase.stats(), secondBase.level(), secondBase.experience(), secondBase.unspentPoints(), java.math.BigDecimal.ZERO,
+                secondBase.learned(), secondBase.loadout(), secondBase.cooldowns(), secondBase.restrictedKills(), true, secondDeath, died);
+            repository.create(second); var tail = new games.dmg.fantasystick.items.TailBooks().create(second); target.core.inventory.setItem(12, tail);
+            var untouched = new games.dmg.fantasystick.persistence.RevivalStore.Reservation(java.util.UUID.randomUUID(),
+                java.util.UUID.randomUUID(), target.core.id, second.id(), secondDeath,
+                java.time.Instant.now().truncatedTo(java.time.temporal.ChronoUnit.SECONDS), 12, 1, -1);
+            store.reserve(untouched).join();
+            ((games.dmg.fantasystick.ability.Revive) FantasyStickLifecycleNativeTest.Fixture.field(fixture.plugin, "revive")).reconcile(target.player);
+            store.target(target.core.id).join(); PartyBookNativeTest.drain(fixture);
+            assertTrue(storage.find(second.id()).get().orElseThrow().dead());
+            assertEquals(tail, target.core.inventory.getItem(12)); assertTrue(store.find(second.id()).join().isEmpty());
+        }
+    }
+
+    private static void withRevive(Path data, FantasyStickLifecycleNativeTest.Actor actor) throws Exception {
+        var repository = new games.dmg.fantasystick.persistence.YamlCharacterRepository(data);
+        var old = repository.load(actor.core.record.id()).orElseThrow();
+        var stats = new java.util.EnumMap<>(old.stats());
+        stats.put(games.dmg.fantasystick.progression.Stat.WIS, BigInteger.valueOf(30));
+        stats.put(games.dmg.fantasystick.progression.Stat.CHR, BigInteger.valueOf(24));
+        stats.put(games.dmg.fantasystick.progression.Stat.CON, BigInteger.valueOf(12));
+        var saved = new games.dmg.fantasystick.persistence.CharacterRecord(old.id(), old.name(), old.revision().add(BigInteger.ONE),
+            stats, old.level(), old.experience(), old.unspentPoints(), old.maximumHealth(), java.util.Set.of("revive"),
+            java.util.List.of("revive", "", "", "", "", "", ""), old.cooldowns(), old.restrictedKills(), false, null, null);
+        repository.replace(saved, old.revision());
+    }
+
+    @Test void packagedDefinitionMatchesReviewedReviveContract() throws Exception {
+        try (var fixture = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            fixture.plugin.setEnabled(true);
+            var registry = (games.dmg.fantasystick.ability.AbilityRegistry)
+                FantasyStickLifecycleNativeTest.Fixture.field(fixture.plugin, "abilityRegistry");
+            var revive = registry.find("revive").orElseThrow();
+            assertEquals(org.bukkit.Material.ECHO_SHARD, revive.icon());
+            assertEquals(BigInteger.ONE, revive.pointCost());
+            assertEquals(BigInteger.valueOf(30), revive.requirements().get(games.dmg.fantasystick.progression.Stat.WIS));
+            assertEquals(BigInteger.valueOf(24), revive.requirements().get(games.dmg.fantasystick.progression.Stat.CHR));
+            assertEquals(BigInteger.valueOf(12), revive.requirements().get(games.dmg.fantasystick.progression.Stat.CON));
+            assertEquals(Duration.ofHours(24), revive.cooldown());
+            assertEquals(games.dmg.fantasystick.session.ControlInput.Gesture.USE, revive.gesture());
+            assertEquals(games.dmg.fantasystick.ability.AbilityDefinition.Activation.SELECTION, revive.activation());
+        }
+    }
+}