feat(classes): add tyrant class assignment

.gitea/workflows/ci.yml

@@ -0,0 +1,40 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 17
+          cache: gradle
+
+      - name: Validate conventional commits
+        if: github.event_name == 'pull_request'
+        run: |
+          npx -y \
+            -p @commitlint/cli \
+            -p @commitlint/config-conventional \
+            commitlint --from "${{ github.event.pull_request.base.sha }}" --to "${{ github.sha }}" \
+            --extends @commitlint/config-conventional
+
+      - name: Build and test
+        run: ./gradlew clean check jar
+
+      - name: Upload development artifact
+        uses: actions/upload-artifact@v3
+        with:
+          name: spigot-tyrant-${{ github.sha }}
+          path: build/libs/*.jar
+          if-no-files-found: error

.gitea/workflows/release.yml

@@ -0,0 +1,141 @@
+name: Release
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          token: ${{ secrets.RELEASE_TOKEN }}
+
+      - name: Set up Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 17
+          cache: gradle
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+
+      - name: Build and test before release
+        run: ./gradlew clean check
+
+      - name: Capture previous tag
+        id: previous_tag
+        run: |
+          if git describe --tags --abbrev=0 >/dev/null 2>&1; then
+            echo "value=$(git describe --tags --abbrev=0)" >> "$GITHUB_OUTPUT"
+          else
+            echo "value=" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Run semantic-release
+        env:
+          GITHUB_TOKEN: ${{ secrets.RELEASE_TOKEN }}
+        run: |
+          npx -y \
+            -p semantic-release@24.2.9 \
+            -p @semantic-release/commit-analyzer@13.0.1 \
+            -p @semantic-release/release-notes-generator@14.1.0 \
+            semantic-release \
+            --branches main \
+            --plugins @semantic-release/commit-analyzer,@semantic-release/release-notes-generator
+
+      - name: Capture current tag
+        id: current_tag
+        run: |
+          if git describe --tags --exact-match HEAD >/dev/null 2>&1; then
+            echo "value=$(git describe --tags --exact-match HEAD)" >> "$GITHUB_OUTPUT"
+          else
+            echo "value=" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Resolve release
+        id: release
+        env:
+          PREVIOUS_TAG: ${{ steps.previous_tag.outputs.value }}
+          CURRENT_TAG: ${{ steps.current_tag.outputs.value }}
+        run: |
+          if [ -n "$CURRENT_TAG" ] && [ "$CURRENT_TAG" != "$PREVIOUS_TAG" ]; then
+            echo "created=true" >> "$GITHUB_OUTPUT"
+            echo "tag=$CURRENT_TAG" >> "$GITHUB_OUTPUT"
+            echo "version=${CURRENT_TAG#v}" >> "$GITHUB_OUTPUT"
+          else
+            echo "created=false" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Build versioned plugin
+        if: steps.release.outputs.created == 'true'
+        env:
+          VERSION: ${{ steps.release.outputs.version }}
+        run: ./gradlew clean jar -PreleaseVersion="$VERSION"
+
+      - name: Upload release workflow artifact
+        if: steps.release.outputs.created == 'true'
+        uses: actions/upload-artifact@v3
+        with:
+          name: spigot-tyrant-${{ steps.release.outputs.version }}
+          path: build/libs/spigot-tyrant-${{ steps.release.outputs.version }}.jar
+          if-no-files-found: error
+
+      - name: Create Gitea release and upload plugin
+        if: steps.release.outputs.created == 'true'
+        env:
+          GITEA_TOKEN: ${{ secrets.RELEASE_TOKEN }}
+          GITEA_SERVER_URL: ${{ github.server_url }}
+          REPOSITORY: ${{ github.repository }}
+          TAG: ${{ steps.release.outputs.tag }}
+          VERSION: ${{ steps.release.outputs.version }}
+          PREVIOUS_TAG: ${{ steps.previous_tag.outputs.value }}
+        run: |
+          api_url="${GITEA_SERVER_URL}/api/v1"
+          jar="build/libs/spigot-tyrant-${VERSION}.jar"
+          export RELEASE_BODY
+          if [ -n "$PREVIOUS_TAG" ]; then
+            RELEASE_BODY=$(git log --pretty='format:- %s (%h)' "${PREVIOUS_TAG}..HEAD")
+          else
+            RELEASE_BODY=$(git log --pretty='format:- %s (%h)' HEAD)
+          fi
+          payload=$(node -e '
+            const payload = {
+              tag_name: process.env.TAG,
+              name: process.env.TAG,
+              body: process.env.RELEASE_BODY,
+              draft: false,
+              prerelease: false
+            };
+            process.stdout.write(JSON.stringify(payload));
+          ')
+          response=$(curl --fail-with-body --silent --show-error \
+            -X POST \
+            -H "Authorization: token ${GITEA_TOKEN}" \
+            -H "Content-Type: application/json" \
+            "${api_url}/repos/${REPOSITORY}/releases" \
+            --data "$payload")
+          release_id=$(printf '%s' "$response" | node -e '
+            let input = "";
+            process.stdin.on("data", chunk => input += chunk);
+            process.stdin.on("end", () => {
+              const response = JSON.parse(input);
+              if (!response.id) process.exit(1);
+              process.stdout.write(String(response.id));
+            });
+          ')
+          curl --fail-with-body --silent --show-error \
+            -X POST \
+            -H "Authorization: token ${GITEA_TOKEN}" \
+            -H "Content-Type: application/octet-stream" \
+            --data-binary "@${jar}" \
+            "${api_url}/repos/${REPOSITORY}/releases/${release_id}/assets?name=spigot-tyrant-${VERSION}.jar"

.gitignore

@@ -0,0 +1,4 @@
+.gradle/
+build/
+.idea/
+*.iml

AGENTS.md

@@ -0,0 +1,53 @@
+# Repository Agent Guidance
+
+## User-story-driven development
+
+The `design/` directory is the OKF v0.1 product record for this repository. Use user stories to plan, implement, verify, and track all behavior.
+
+Before changing behavior:
+
+1. Read `design/index.md` and every story related to the requested behavior.
+2. Draft updates to an existing story or create a new `design/user-stories/us-NNN-short-name.md` story before implementation.
+3. Define observable acceptance criteria using user or operator language.
+4. Present the relevant new or updated stories and acceptance criteria to the user for review, and wait for explicit confirmation before changing implementation code.
+5. Incorporate requested story changes before proceeding.
+6. Set story status to `in-progress` while approved implementation is incomplete.
+
+While implementing:
+
+1. Work in vertical slices against the documented acceptance criteria.
+2. Add tests for important behavior before implementation when practical.
+3. Keep implementation references and related-story links current.
+4. Do not mark an acceptance criterion complete until the behavior exists and has been validated.
+
+Before completing or committing:
+
+1. Set a completed story status to `done` only when all acceptance criteria are complete and verified.
+2. Check completed acceptance criteria and record validation evidence where appropriate.
+3. Update `design/index.md` and `design/user-stories/index.md` whenever stories are added, renamed, moved, or materially reclassified.
+4. Add a high-level entry to `design/log.md` under the verified current date.
+5. Run OKF validation along with relevant Gradle tests, lint checks, and builds.
+
+## OKF conventions
+
+- Every non-reserved Markdown file in `design/` must have YAML frontmatter with a non-empty `type`.
+- User stories use `type: User Story` and include `status`, `title`, and `description`.
+- Allowed story statuses are `backlog`, `in-progress`, and `done`.
+- Every user story includes an acceptance-criteria section using Markdown task-list items.
+- `design/index.md` and `design/log.md` are reserved OKF files and follow the OKF index/log structures.
+- Store user stories in `design/user-stories/` and keep their catalog current.
+- Use standard Markdown links and keep repository-local links valid when files move.
+- Preserve unknown frontmatter extensions.
+
+## Java and Spigot development
+
+- Use the Java version and Spigot API version declared by the Gradle build.
+- Treat compiler warnings as errors.
+- Prefer test-first development for domain rules and state transitions when practical.
+- Run `./gradlew clean check jar` before completing implementation work.
+- Keep Bukkit event handlers thin and move testable game rules into focused domain services.
+- Do not perform blocking file or network operations on the server tick thread.
+
+## Timestamps
+
+Always run `date +%Y-%m-%d` before adding or updating dates in stories or the design log. Use RFC 3339 UTC timestamps (`YYYY-MM-DDTHH:MM:SSZ`) when a date-time is required. Never guess dates.

build.gradle.kts

@@ -0,0 +1,46 @@
+plugins {
+    java
+}
+
+group = "games.dmg"
+version = providers.gradleProperty("releaseVersion")
+    .orElse("0.1.0-SNAPSHOT")
+    .get()
+
+repositories {
+    mavenCentral()
+    maven("https://hub.spigotmc.org/nexus/content/repositories/snapshots/")
+}
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(17)
+    }
+}
+
+tasks.withType<JavaCompile>().configureEach {
+    options.compilerArgs.addAll(listOf("-Xlint:all", "-Werror"))
+}
+
+dependencies {
+    compileOnly("org.spigotmc:spigot-api:26.2-R0.1-SNAPSHOT")
+
+    testImplementation("org.spigotmc:spigot-api:26.2-R0.1-SNAPSHOT")
+    testImplementation(platform("org.junit:junit-bom:5.13.4"))
+    testImplementation("org.junit.jupiter:junit-jupiter")
+    testImplementation("org.mockito:mockito-core:5.18.0")
+    testImplementation("org.yaml:snakeyaml:2.4")
+    testRuntimeOnly("org.junit.platform:junit-platform-launcher")
+}
+
+tasks.test {
+    useJUnitPlatform()
+}
+
+val pluginVersion = version
+
+tasks.processResources {
+    filesMatching("plugin.yml") {
+        expand("version" to pluginVersion)
+    }
+}

design/log.md

@@ -6,6 +6,48 @@ description: Chronological record of material decisions affecting the Spigot Tyr
 
 # Spigot Tyrant Design Log
 
+## 2026-08-14 — Tyrant class assignment completed
+
+- Completed US-004 with `/tyrant assign <class> <player>`, purchased-class authorization, UUID state, one holder per class, and one Tyrant-side class per player.
+- Preserved dual alignment so Vigilantes and Followers can hold a Tyrant-side class, while rejecting the Tyrant and opted-out targets.
+- Added reassignment and reign cleanup for class cooldown/item state, online assignment/removal notices, and login control reminders.
+- Verified assignment constraints, dual alignment, cleanup, commands, notifications, and reminders with the Gradle test suite.
+
+## 2026-08-14 — Tyrant class assignment implementation started
+
+- US-004 begins with test-first purchased-class authorization, one-holder constraints, dual alignment, reassignment cleanup, and reign-wide removal.
+
+## 2026-08-14 — Tyrant progression completed
+
+- Completed US-003 with exact Tyrant-on-Vigilante kill attribution, level and choice rewards, pause guards, one-time purchases, and reign reset behavior.
+- Added `/tyrant choices` status output and `/tyrant buy <unlock>` with durable atomic state updates and clear failure feedback.
+- Verified progression, duplicate purchase, authorization, paused-state, reset, command presentation, metadata, and persistence behavior with the Gradle test suite.
+
+## 2026-08-14 — Tyrant progression implementation started
+
+- US-003 begins with test-first kill attribution, one-time unlock purchases, and player-visible choice status.
+
+## 2026-08-14 — Configuration and persistence completed
+
+- Completed US-012 with validated defaults for ranges, timers, effects, items, messages, and mob restrictions, including runtime Bukkit section parsing.
+- Added immutable lifecycle and player state for roles, dual-alignment classes, progression, participation, cooldowns, bound items, and captured mobs.
+- Added RFC 3339 UTC timestamp persistence, paused deadline shifting, atomic YAML replacement, invalid-record rejection, unknown-field preservation, periodic saves, and shutdown saves.
+- Verified all state, settings, bundled configuration, corruption, forward-compatibility, and pause-time tests with `./gradlew clean check jar`.
+
+## 2026-08-14 — Configuration and persistence implementation started
+
+- US-012 begins with test-first validated defaults, immutable UUID-keyed domain state, paused-time-aware clocks, and defensive atomic YAML persistence.
+
+## 2026-08-14 — Build and release foundation completed
+
+- Completed US-013 with a Java 17 Gradle build, Spigot 26.2 API, strict compiler linting, JUnit 5 and Mockito dependencies, plugin metadata, and a minimal plugin entrypoint.
+- Added Gitea push and pull-request CI, conventional-commit validation, development artifacts, semantic versioning, and versioned Gitea release assets modeled on `../spigot-base/`.
+- Verified `./gradlew clean check jar`, a release-version `1.2.3` JAR and embedded plugin version, workflow delivery settings, and OKF conformance.
+
+## 2026-08-14 — Build and release implementation started
+
+- Approved implementation begins with US-013 and a test-driven Java 17, Gradle, Spigot, and Gitea Actions foundation modeled on `../spigot-base/`.
+
 ## 2026-08-14 — Initial game design
 
 - The game has one Tyrant and one Vigilante, with Followers aligned to the Vigilante and Assassin, Fixer, and Tamer classes assigned by the Tyrant.

design/user-stories/us-003-progress-and-purchase-unlocks.md

@@ -2,7 +2,7 @@
 type: User Story
 title: "US-003: Progress and purchase Tyrant unlocks"
 description: Let the Tyrant earn and spend choices by personally defeating the Vigilante.
-status: backlog
+status: done
 ---
 
 # US-003: Progress and purchase Tyrant unlocks
@@ -11,14 +11,14 @@ As the **Tyrant**, I want to earn one meaningful choice for defeating the Vigila
 
 ## Acceptance criteria
 
-- [ ] The Tyrant gains one level and one unlock choice only when personally credited with killing the current Vigilante.
+- [x] The Tyrant gains one level and one unlock choice only when personally credited with killing the current Vigilante.
-- [ ] A Vigilante death caused by another player, the environment, or the Vigilante does not level the Tyrant.
+- [x] A Vigilante death caused by another player, the environment, or the Vigilante does not level the Tyrant.
-- [ ] Available purchases are Assassin, Fixer, Tamer, roster intelligence, permanent Resistance, and permanent Strength.
+- [x] Available purchases are Assassin, Fixer, Tamer, roster intelligence, permanent Resistance, and permanent Strength.
-- [ ] Each class or ability can be purchased at most once during a reign.
+- [x] Each class or ability can be purchased at most once during a reign.
-- [ ] A menu or command clearly identifies purchased, available, and unavailable choices.
+- [x] A menu or command clearly identifies purchased, available, and unavailable choices.
-- [ ] A purchase consumes exactly one unspent choice and cannot be duplicated by retries or concurrent input.
+- [x] A purchase consumes exactly one unspent choice and cannot be duplicated by retries or concurrent input.
-- [ ] Progress cannot be earned or spent while the game is paused.
+- [x] Progress cannot be earned or spent while the game is paused.
-- [ ] Levels, purchases, and unspent choices survive logout and restart but reset when the reign ends.
+- [x] Levels, purchases, and unspent choices survive logout and restart but reset when the reign ends.
 
 ## Related
 

design/user-stories/us-004-assign-unlocked-classes.md

@@ -2,7 +2,7 @@
 type: User Story
 title: "US-004: Assign unlocked classes"
 description: Let the Tyrant assign each purchased class to one eligible participant.
-status: backlog
+status: done
 ---
 
 # US-004: Assign unlocked classes
@@ -11,14 +11,14 @@ As the **Tyrant**, I want to assign unlocked specialist classes so that I can bu
 
 ## Acceptance criteria
 
-- [ ] The Tyrant can assign only Assassin, Fixer, and Tamer classes purchased during the current reign.
+- [x] The Tyrant can assign only Assassin, Fixer, and Tamer classes purchased during the current reign.
-- [ ] Each class can be assigned to at most one player at a time, and a player can hold at most one Tyrant-side class.
+- [x] Each class can be assigned to at most one player at a time, and a player can hold at most one Tyrant-side class.
-- [ ] Role alignment and Tyrant-side class are independent: the Vigilante or a Follower may simultaneously be the Assassin, Fixer, or Tamer.
+- [x] Role alignment and Tyrant-side class are independent: the Vigilante or a Follower may simultaneously be the Assassin, Fixer, or Tamer.
-- [ ] The Tyrant cannot assign a class to the Tyrant, an opted-out player, or another ineligible player.
+- [x] The Tyrant cannot assign a class to the Tyrant, an opted-out player, or another ineligible player.
-- [ ] Reassignment removes the class and its bound items and effects from the previous holder before granting it to the new holder.
+- [x] Reassignment removes the class and its bound items and effects from the previous holder before granting it to the new holder.
-- [ ] Assignment and removal are stored by UUID and communicated clearly to affected players.
+- [x] Assignment and removal are stored by UUID and communicated clearly to affected players.
-- [ ] A class holder is reminded of the assignment and its controls on login.
+- [x] A class holder is reminded of the assignment and its controls on login.
-- [ ] All class assignments end when the Tyrant's reign ends.
+- [x] All class assignments end when the Tyrant's reign ends.
 
 ## Related
 

design/user-stories/us-012-configure-and-persist-state.md

@@ -2,7 +2,7 @@
 type: User Story
 title: "US-012: Configure and persist game state"
 description: Give operators validated configuration and durable defensive storage for all Tyrant behavior.
-status: backlog
+status: done
 ---
 
 # US-012: Configure and persist game state
@@ -11,15 +11,15 @@ As a **server operator**, I want configurable and durable game behavior so that
 
 ## Acceptance criteria
 
-- [ ] Configuration covers ranges, durations, cooldowns, inactivity periods, candidate windows, retry intervals, effect levels and caps, mob restrictions, item materials and names, messages, and timer behavior.
+- [x] Configuration covers ranges, durations, cooldowns, inactivity periods, candidate windows, retry intervals, effect levels and caps, mob restrictions, item materials and names, messages, and timer behavior.
-- [ ] Defaults match the approved user stories, including a 50-block Tyrant range and Follower range, seven-day opt-out, 48-hour inactivity, and 24-hour candidate windows.
+- [x] Defaults match the approved user stories, including a 50-block Tyrant range and Follower range, seven-day opt-out, 48-hour inactivity, and 24-hour candidate windows.
-- [ ] Invalid required configuration prevents partial plugin initialization and produces a clear server log message.
+- [x] Invalid required configuration prevents partial plugin initialization and produces a clear server log message.
-- [ ] UUID-keyed state stores lifecycle, current and pending roles, assignments, login history, participation, reign progression, purchases, choices, cooldowns, paused time, item delivery, and captured mobs.
+- [x] UUID-keyed state stores lifecycle, current and pending roles, assignments, login history, participation, reign progression, purchases, choices, cooldowns, paused time, item delivery, and captured mobs.
-- [ ] Cooldowns and deadlines use UTC instants and exclude administratively paused time.
+- [x] Cooldowns and deadlines use UTC instants and exclude administratively paused time.
-- [ ] State is saved using atomic replacement where supported so failed writes do not replace valid state with partial data.
+- [x] State is saved using atomic replacement where supported so failed writes do not replace valid state with partial data.
-- [ ] Corrupt, unknown, or invalid records cannot silently grant progression, roles, powers, items, or duplicated mobs.
+- [x] Corrupt, unknown, or invalid records cannot silently grant progression, roles, powers, items, or duplicated mobs.
-- [ ] Unknown forward-compatible configuration and state fields are preserved where practical.
+- [x] Unknown forward-compatible configuration and state fields are preserved where practical.
-- [ ] Plugin disable removes transient effects and presentation safely while preserving durable state.
+- [x] Plugin disable removes transient effects and presentation safely while preserving durable state.
 
 ## Related
 

design/user-stories/us-013-build-test-and-release.md

@@ -2,7 +2,7 @@
 type: User Story
 title: "US-013: Build, test, and release the plugin"
 description: Give maintainers repeatable builds, automated verification, and versioned Gitea releases.
-status: backlog
+status: done
 ---
 
 # US-013: Build, test, and release the plugin
@@ -11,15 +11,15 @@ As a **plugin maintainer**, I want automated builds and releases modeled on Spig
 
 ## Acceptance criteria
 
-- [ ] The Gradle Kotlin DSL project compiles against Spigot API `26.2-R0.1-SNAPSHOT` using a Java 17 toolchain.
+- [x] The Gradle Kotlin DSL project compiles against Spigot API `26.2-R0.1-SNAPSHOT` using a Java 17 toolchain.
-- [ ] Compiler lint warnings fail the build.
+- [x] Compiler lint warnings fail the build.
-- [ ] Automated JUnit 5 and Mockito tests run as part of the Gradle check lifecycle.
+- [x] Automated JUnit 5 and Mockito tests run as part of the Gradle check lifecycle.
-- [ ] Pushes and pull requests build and test the plugin in Gitea Actions.
+- [x] Pushes and pull requests build and test the plugin in Gitea Actions.
-- [ ] Pull requests validate conventional commit messages.
+- [x] Pull requests validate conventional commit messages.
-- [ ] CI stores a `spigot-tyrant` development JAR as a workflow artifact.
+- [x] CI stores a `spigot-tyrant` development JAR as a workflow artifact.
-- [ ] Main-branch conventional commits drive semantic versioning.
+- [x] Main-branch conventional commits drive semantic versioning.
-- [ ] A successful release builds a versioned JAR and attaches it to the corresponding Gitea release.
+- [x] A successful release builds a versioned JAR and attaches it to the corresponding Gitea release.
-- [ ] Build files, Gradle wrapper, workflows, and release behavior follow `../spigot-base/` where applicable while using Spigot Tyrant names and identifiers.
+- [x] Build files, Gradle wrapper, workflows, and release behavior follow `../spigot-base/` where applicable while using Spigot Tyrant names and identifiers.
 
 ## Related
 

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.6.1-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,248 @@
+#!/bin/sh
+
+#
+# Copyright © 2015 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   gradlew start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh gradlew
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/3d91ce3b8caaf77ad09f381f43615b715b53f72c/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='-Dfile.encoding=UTF-8 "-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,82 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  gradlew startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables, and ensure extensions are enabled
+setlocal EnableExtensions
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS=-Dfile.encoding=UTF-8 "-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+"%COMSPEC%" /c exit 1
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+"%COMSPEC%" /c exit 1
+
+:execute
+@rem Setup the command line
+
+
+
+@rem Execute gradlew
+@rem endlocal doesn't take effect until after the line is parsed and variables are expanded
+@rem which allows us to clear the local environment before executing the java command
+endlocal & "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %* & call :exitWithErrorLevel
+
+:exitWithErrorLevel
+@rem Use "%COMSPEC%" /c exit to allow operators to work properly in scripts
+"%COMSPEC%" /c exit %ERRORLEVEL%

settings.gradle.kts

@@ -0,0 +1 @@
+rootProject.name = "spigot-tyrant"

src/main/java/games/dmg/spigottyrant/Ability.java

@@ -0,0 +1,9 @@
+package games.dmg.spigottyrant;
+
+public enum Ability {
+    ASSASSIN_INVISIBILITY,
+    ASSASSIN_DOUBLE_JUMP,
+    FIXER_BOOST,
+    TAMER_CAPTURE,
+    ROSTER_INTELLIGENCE
+}

src/main/java/games/dmg/spigottyrant/BukkitOnlinePlayerDirectory.java

@@ -0,0 +1,17 @@
+package games.dmg.spigottyrant;
+
+import java.util.UUID;
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
+
+public final class BukkitOnlinePlayerDirectory implements OnlinePlayerDirectory {
+    @Override
+    public Player findByName(String name) {
+        return Bukkit.getPlayerExact(name);
+    }
+
+    @Override
+    public Player findById(UUID playerId) {
+        return Bukkit.getPlayer(playerId);
+    }
+}

src/main/java/games/dmg/spigottyrant/CapturedMob.java

@@ -0,0 +1,14 @@
+package games.dmg.spigottyrant;
+
+import java.util.Locale;
+import java.util.Map;
+
+public record CapturedMob(String entityType, Map<String, String> data) {
+    public CapturedMob {
+        if (entityType == null || entityType.isBlank()) {
+            throw new IllegalArgumentException("entityType must not be blank");
+        }
+        entityType = entityType.trim().toUpperCase(Locale.ROOT);
+        data = data == null ? Map.of() : Map.copyOf(data);
+    }
+}

src/main/java/games/dmg/spigottyrant/ClassAssignmentMessages.java

@@ -0,0 +1,18 @@
+package games.dmg.spigottyrant;
+
+public final class ClassAssignmentMessages {
+    private ClassAssignmentMessages() {
+    }
+
+    public static String loginReminder(PlayerState player) {
+        return switch (player.tyrantClass()) {
+            case ASSASSIN -> "Class: ASSASSIN. Use your Assassin Cloak; double-jump while "
+                + "airborne. Use /tyrant item to recover ready class items.";
+            case FIXER -> "Class: FIXER. Use your Fixer's Wrench to activate your boost. "
+                + "Use /tyrant item to recover ready class items.";
+            case TAMER -> "Class: TAMER. Use your Tamer's Lead to capture mobs. "
+                + "Use /tyrant item to recover ready class items.";
+            case NONE -> "";
+        };
+    }
+}

src/main/java/games/dmg/spigottyrant/ClassAssignmentResult.java

@@ -0,0 +1,16 @@
+package games.dmg.spigottyrant;
+
+import java.util.Map;
+import java.util.Optional;
+import java.util.UUID;
+
+public record ClassAssignmentResult(
+    Map<UUID, PlayerState> players,
+    ClassAssignmentStatus status,
+    Optional<UUID> previousHolderId
+) {
+    public ClassAssignmentResult {
+        players = Map.copyOf(players);
+        previousHolderId = previousHolderId == null ? Optional.empty() : previousHolderId;
+    }
+}

src/main/java/games/dmg/spigottyrant/ClassAssignmentService.java

@@ -0,0 +1,129 @@
+package games.dmg.spigottyrant;
+
+import java.time.Instant;
+import java.util.EnumMap;
+import java.util.EnumSet;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+import java.util.UUID;
+
+public final class ClassAssignmentService {
+    public ClassAssignmentResult assign(
+        GameState game,
+        Map<UUID, PlayerState> players,
+        UUID assignerId,
+        UUID targetId,
+        TyrantClass tyrantClass,
+        Instant now
+    ) {
+        ClassAssignmentStatus rejected = rejection(
+            game, players, assignerId, targetId, tyrantClass, now
+        );
+        if (rejected != null) {
+            return new ClassAssignmentResult(players, rejected, Optional.empty());
+        }
+
+        Map<UUID, PlayerState> updated = new HashMap<>(players);
+        Optional<UUID> previousHolder = players.values().stream()
+            .filter(player -> player.tyrantClass() == tyrantClass)
+            .map(PlayerState::playerId)
+            .filter(playerId -> !playerId.equals(targetId))
+            .findFirst();
+        previousHolder.ifPresent(playerId -> updated.put(
+            playerId,
+            withClass(updated.get(playerId), TyrantClass.NONE)
+        ));
+        updated.put(targetId, withClass(updated.get(targetId), tyrantClass));
+        return new ClassAssignmentResult(
+            updated,
+            ClassAssignmentStatus.ASSIGNED,
+            previousHolder
+        );
+    }
+
+    public Map<UUID, PlayerState> clearAll(Map<UUID, PlayerState> players) {
+        Map<UUID, PlayerState> updated = new HashMap<>();
+        for (PlayerState player : players.values()) {
+            updated.put(player.playerId(), withClass(player, TyrantClass.NONE));
+        }
+        return Map.copyOf(updated);
+    }
+
+    private static ClassAssignmentStatus rejection(
+        GameState game,
+        Map<UUID, PlayerState> players,
+        UUID assignerId,
+        UUID targetId,
+        TyrantClass tyrantClass,
+        Instant now
+    ) {
+        if (game.lifecycle() != GameLifecycle.RUNNING) {
+            return ClassAssignmentStatus.GAME_NOT_RUNNING;
+        }
+        if (game.tyrantId().isEmpty() || !game.tyrantId().orElseThrow().equals(assignerId)) {
+            return ClassAssignmentStatus.NOT_TYRANT;
+        }
+        if (tyrantClass == null || tyrantClass == TyrantClass.NONE) {
+            return ClassAssignmentStatus.INVALID_CLASS;
+        }
+        if (!game.purchases().contains(unlockFor(tyrantClass))) {
+            return ClassAssignmentStatus.CLASS_NOT_UNLOCKED;
+        }
+        PlayerState target = players.get(targetId);
+        if (target == null) {
+            return ClassAssignmentStatus.UNKNOWN_PLAYER;
+        }
+        if (targetId.equals(assignerId)) {
+            return ClassAssignmentStatus.TARGET_IS_TYRANT;
+        }
+        if (target.optedOutUntil().filter(until -> until.isAfter(now)).isPresent()) {
+            return ClassAssignmentStatus.TARGET_OPTED_OUT;
+        }
+        return null;
+    }
+
+    private static TyrantUnlock unlockFor(TyrantClass tyrantClass) {
+        return switch (tyrantClass) {
+            case ASSASSIN -> TyrantUnlock.ASSASSIN;
+            case FIXER -> TyrantUnlock.FIXER;
+            case TAMER -> TyrantUnlock.TAMER;
+            case NONE -> throw new IllegalArgumentException("NONE is not assignable");
+        };
+    }
+
+    private static PlayerState withClass(PlayerState player, TyrantClass tyrantClass) {
+        Map<Ability, Instant> cooldowns = new EnumMap<>(Ability.class);
+        cooldowns.putAll(player.cooldownEnds());
+        Set<Ability> readyItems = EnumSet.noneOf(Ability.class);
+        readyItems.addAll(player.readyAbilityItems());
+        for (Ability ability : abilitiesFor(player.tyrantClass())) {
+            cooldowns.remove(ability);
+            readyItems.remove(ability);
+        }
+        return new PlayerState(
+            player.playerId(),
+            player.latestName(),
+            player.lastLogin(),
+            player.optedOutUntil(),
+            tyrantClass,
+            player.followerOf(),
+            cooldowns,
+            readyItems,
+            player.capturedMobs()
+        );
+    }
+
+    private static Set<Ability> abilitiesFor(TyrantClass tyrantClass) {
+        return switch (tyrantClass) {
+            case ASSASSIN -> Set.of(
+                Ability.ASSASSIN_INVISIBILITY,
+                Ability.ASSASSIN_DOUBLE_JUMP
+            );
+            case FIXER -> Set.of(Ability.FIXER_BOOST);
+            case TAMER -> Set.of(Ability.TAMER_CAPTURE);
+            case NONE -> Set.of();
+        };
+    }
+}

src/main/java/games/dmg/spigottyrant/ClassAssignmentStatus.java

@@ -0,0 +1,12 @@
+package games.dmg.spigottyrant;
+
+public enum ClassAssignmentStatus {
+    ASSIGNED,
+    GAME_NOT_RUNNING,
+    NOT_TYRANT,
+    CLASS_NOT_UNLOCKED,
+    INVALID_CLASS,
+    UNKNOWN_PLAYER,
+    TARGET_IS_TYRANT,
+    TARGET_OPTED_OUT
+}

src/main/java/games/dmg/spigottyrant/GameLifecycle.java

@@ -0,0 +1,7 @@
+package games.dmg.spigottyrant;
+
+public enum GameLifecycle {
+    UNSTARTED,
+    RUNNING,
+    PAUSED
+}

src/main/java/games/dmg/spigottyrant/GameState.java

@@ -0,0 +1,59 @@
+package games.dmg.spigottyrant;
+
+import java.time.Duration;
+import java.time.Instant;
+import java.util.Optional;
+import java.util.Set;
+import java.util.UUID;
+
+public record GameState(
+    GameLifecycle lifecycle,
+    Optional<UUID> tyrantId,
+    Optional<UUID> vigilanteId,
+    Optional<PendingSelection> pendingTyrant,
+    Optional<PendingSelection> pendingVigilante,
+    Optional<Instant> pausedAt,
+    Duration accumulatedPausedTime,
+    int tyrantLevel,
+    int unspentChoices,
+    Set<TyrantUnlock> purchases
+) {
+    public GameState {
+        lifecycle = lifecycle == null ? GameLifecycle.UNSTARTED : lifecycle;
+        tyrantId = tyrantId == null ? Optional.empty() : tyrantId;
+        vigilanteId = vigilanteId == null ? Optional.empty() : vigilanteId;
+        pendingTyrant = pendingTyrant == null ? Optional.empty() : pendingTyrant;
+        pendingVigilante = pendingVigilante == null ? Optional.empty() : pendingVigilante;
+        pausedAt = pausedAt == null ? Optional.empty() : pausedAt;
+        accumulatedPausedTime = accumulatedPausedTime == null
+            ? Duration.ZERO : accumulatedPausedTime;
+        purchases = purchases == null ? Set.of() : Set.copyOf(purchases);
+        if (tyrantId.isPresent() && tyrantId.equals(vigilanteId)) {
+            throw new IllegalArgumentException("Tyrant and Vigilante must be different players");
+        }
+        if (tyrantLevel < 0 || unspentChoices < 0) {
+            throw new IllegalArgumentException("progression values must not be negative");
+        }
+        if (accumulatedPausedTime.isNegative()) {
+            throw new IllegalArgumentException("accumulated paused time must not be negative");
+        }
+        if ((lifecycle == GameLifecycle.PAUSED) != pausedAt.isPresent()) {
+            throw new IllegalArgumentException("pausedAt must be present exactly while paused");
+        }
+    }
+
+    public static GameState empty() {
+        return new GameState(
+            GameLifecycle.UNSTARTED,
+            Optional.empty(),
+            Optional.empty(),
+            Optional.empty(),
+            Optional.empty(),
+            Optional.empty(),
+            Duration.ZERO,
+            0,
+            0,
+            Set.of()
+        );
+    }
+}

src/main/java/games/dmg/spigottyrant/OnlinePlayerDirectory.java

@@ -0,0 +1,10 @@
+package games.dmg.spigottyrant;
+
+import java.util.UUID;
+import org.bukkit.entity.Player;
+
+public interface OnlinePlayerDirectory {
+    Player findByName(String name);
+
+    Player findById(UUID playerId);
+}

src/main/java/games/dmg/spigottyrant/PauseAwareTime.java

@@ -0,0 +1,20 @@
+package games.dmg.spigottyrant;
+
+import java.time.Duration;
+import java.time.Instant;
+import java.util.Objects;
+
+public final class PauseAwareTime {
+    private PauseAwareTime() {
+    }
+
+    public static Instant shiftDeadline(Instant deadline, Instant pausedAt, Instant resumedAt) {
+        Objects.requireNonNull(deadline, "deadline");
+        Objects.requireNonNull(pausedAt, "pausedAt");
+        Objects.requireNonNull(resumedAt, "resumedAt");
+        if (resumedAt.isBefore(pausedAt)) {
+            throw new IllegalArgumentException("resumedAt must not precede pausedAt");
+        }
+        return deadline.plus(Duration.between(pausedAt, resumedAt));
+    }
+}

src/main/java/games/dmg/spigottyrant/PendingSelection.java

@@ -0,0 +1,12 @@
+package games.dmg.spigottyrant;
+
+import java.time.Instant;
+import java.util.Objects;
+import java.util.UUID;
+
+public record PendingSelection(UUID candidateId, Instant expiresAt) {
+    public PendingSelection {
+        Objects.requireNonNull(candidateId, "candidateId");
+        Objects.requireNonNull(expiresAt, "expiresAt");
+    }
+}

src/main/java/games/dmg/spigottyrant/PersistentState.java

@@ -0,0 +1,20 @@
+package games.dmg.spigottyrant;
+
+import java.util.Map;
+import java.util.UUID;
+
+public record PersistentState(GameState game, Map<UUID, PlayerState> players) {
+    public PersistentState {
+        game = game == null ? GameState.empty() : game;
+        players = players == null ? Map.of() : Map.copyOf(players);
+        for (Map.Entry<UUID, PlayerState> entry : players.entrySet()) {
+            if (!entry.getKey().equals(entry.getValue().playerId())) {
+                throw new IllegalArgumentException("player map key must match player state ID");
+            }
+        }
+    }
+
+    public static PersistentState empty() {
+        return new PersistentState(GameState.empty(), Map.of());
+    }
+}

src/main/java/games/dmg/spigottyrant/PlayerJoinListener.java

@@ -0,0 +1,33 @@
+package games.dmg.spigottyrant;
+
+import java.time.Clock;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerJoinEvent;
+
+public final class PlayerJoinListener implements Listener {
+    private final TyrantStateManager stateManager;
+    private final Clock clock;
+
+    public PlayerJoinListener(TyrantStateManager stateManager, Clock clock) {
+        this.stateManager = stateManager;
+        this.clock = clock;
+    }
+
+    @EventHandler
+    public void onJoin(PlayerJoinEvent event) {
+        PlayerState player = stateManager.updatePlayer(
+            event.getPlayer().getUniqueId(),
+            event.getPlayer().getName(),
+            current -> new PlayerState(
+                current.playerId(), current.latestName(), java.util.Optional.of(clock.instant()),
+                current.optedOutUntil(), current.tyrantClass(), current.followerOf(),
+                current.cooldownEnds(), current.readyAbilityItems(), current.capturedMobs()
+            )
+        );
+        String reminder = ClassAssignmentMessages.loginReminder(player);
+        if (!reminder.isEmpty()) {
+            event.getPlayer().sendMessage(reminder);
+        }
+    }
+}

src/main/java/games/dmg/spigottyrant/PlayerState.java

@@ -0,0 +1,51 @@
+package games.dmg.spigottyrant;
+
+import java.time.Instant;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+import java.util.UUID;
+
+public record PlayerState(
+    UUID playerId,
+    String latestName,
+    Optional<Instant> lastLogin,
+    Optional<Instant> optedOutUntil,
+    TyrantClass tyrantClass,
+    Optional<UUID> followerOf,
+    Map<Ability, Instant> cooldownEnds,
+    Set<Ability> readyAbilityItems,
+    List<CapturedMob> capturedMobs
+) {
+    public PlayerState {
+        if (playerId == null) {
+            throw new IllegalArgumentException("playerId must not be null");
+        }
+        if (latestName == null || latestName.isBlank()) {
+            throw new IllegalArgumentException("latestName must not be blank");
+        }
+        latestName = latestName.trim();
+        lastLogin = lastLogin == null ? Optional.empty() : lastLogin;
+        optedOutUntil = optedOutUntil == null ? Optional.empty() : optedOutUntil;
+        tyrantClass = tyrantClass == null ? TyrantClass.NONE : tyrantClass;
+        followerOf = followerOf == null ? Optional.empty() : followerOf;
+        cooldownEnds = cooldownEnds == null ? Map.of() : Map.copyOf(cooldownEnds);
+        readyAbilityItems = readyAbilityItems == null ? Set.of() : Set.copyOf(readyAbilityItems);
+        capturedMobs = capturedMobs == null ? List.of() : List.copyOf(capturedMobs);
+    }
+
+    public static PlayerState newPlayer(UUID playerId, String latestName) {
+        return new PlayerState(
+            playerId,
+            latestName,
+            Optional.empty(),
+            Optional.empty(),
+            TyrantClass.NONE,
+            Optional.empty(),
+            Map.of(),
+            Set.of(),
+            List.of()
+        );
+    }
+}

src/main/java/games/dmg/spigottyrant/PluginSettings.java

@@ -0,0 +1,266 @@
+package games.dmg.spigottyrant;
+
+import java.time.Duration;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.stream.Collectors;
+import org.bukkit.configuration.ConfigurationSection;
+
+public record PluginSettings(
+    double tyrantRangeBlocks,
+    double followerRangeBlocks,
+    Duration optOutDuration,
+    Duration roleInactivity,
+    Duration candidateActivityWindow,
+    Duration pendingSelectionTimeout,
+    Duration selectionRetryInterval,
+    Duration assassinCooldown,
+    Duration assassinInvisibilityDuration,
+    Duration assassinDoubleJumpCooldown,
+    Duration assassinSpeedDuration,
+    Duration assassinWeaknessDuration,
+    int assassinWeaknessLevel,
+    Duration fixerCooldown,
+    Duration fixerEffectDuration,
+    int fixerStrengthLevel,
+    int fixerNormalHeartRows,
+    int fixerNearTyrantHeartRows,
+    Duration rosterIntelligenceCooldown,
+    int tyrantStrengthLevel,
+    int tyrantResistanceLevel,
+    int followerStrengthCap,
+    int followerResistanceCap,
+    Set<String> deniedMobTypes,
+    AbilityItemSettings assassinItem,
+    AbilityItemSettings fixerItem,
+    AbilityItemSettings tamerItem,
+    String recoveryCommand,
+    String inventoryFullMessage,
+    boolean freezeTimersWhilePaused
+) {
+    public PluginSettings {
+        requirePositiveFinite(tyrantRangeBlocks, "tyrant-range-blocks");
+        requirePositiveFinite(followerRangeBlocks, "follower-range-blocks");
+        requirePositive(optOutDuration, "opt-out-seconds");
+        requirePositive(roleInactivity, "role-inactivity-seconds");
+        requirePositive(candidateActivityWindow, "candidate-activity-window-seconds");
+        requirePositive(pendingSelectionTimeout, "pending-selection-timeout-seconds");
+        requirePositive(selectionRetryInterval, "selection-retry-seconds");
+        requirePositive(assassinCooldown, "assassin-cooldown-seconds");
+        requirePositive(assassinInvisibilityDuration, "assassin-invisibility-seconds");
+        requirePositive(assassinDoubleJumpCooldown, "assassin-double-jump-cooldown-seconds");
+        requirePositive(assassinSpeedDuration, "assassin-speed-seconds");
+        requirePositive(assassinWeaknessDuration, "assassin-weakness-seconds");
+        requireEffectLevel(assassinWeaknessLevel, "assassin-weakness-level");
+        requirePositive(fixerCooldown, "fixer-cooldown-seconds");
+        requirePositive(fixerEffectDuration, "fixer-effect-seconds");
+        requireEffectLevel(fixerStrengthLevel, "fixer-strength-level");
+        requireHeartRows(fixerNormalHeartRows, "fixer-normal-heart-rows");
+        requireHeartRows(fixerNearTyrantHeartRows, "fixer-near-tyrant-heart-rows");
+        if (fixerNearTyrantHeartRows < fixerNormalHeartRows) {
+            throw new IllegalArgumentException(
+                "fixer-near-tyrant-heart-rows must be at least fixer-normal-heart-rows"
+            );
+        }
+        requirePositive(rosterIntelligenceCooldown, "roster-intelligence-cooldown-seconds");
+        requireEffectLevel(tyrantStrengthLevel, "tyrant-strength-level");
+        requireEffectLevel(tyrantResistanceLevel, "tyrant-resistance-level");
+        requireEffectLevel(followerStrengthCap, "follower-strength-cap");
+        requireEffectLevel(followerResistanceCap, "follower-resistance-cap");
+        deniedMobTypes = normalizedSet(deniedMobTypes, "denied-mob-types");
+        assassinItem = Objects.requireNonNull(assassinItem, "assassinItem");
+        fixerItem = Objects.requireNonNull(fixerItem, "fixerItem");
+        tamerItem = Objects.requireNonNull(tamerItem, "tamerItem");
+        recoveryCommand = requireText(recoveryCommand, "recovery-command");
+        inventoryFullMessage = requireText(inventoryFullMessage, "inventory-full-message");
+    }
+
+    public static PluginSettings from(Map<String, ?> values) {
+        Objects.requireNonNull(values, "values");
+        return new PluginSettings(
+            decimal(values, "tyrant-range-blocks", 50.0),
+            decimal(values, "follower-range-blocks", 50.0),
+            duration(values, "opt-out-seconds", Duration.ofDays(7)),
+            duration(values, "role-inactivity-seconds", Duration.ofHours(48)),
+            duration(values, "candidate-activity-window-seconds", Duration.ofHours(24)),
+            duration(values, "pending-selection-timeout-seconds", Duration.ofHours(24)),
+            duration(values, "selection-retry-seconds", Duration.ofMinutes(1)),
+            duration(values, "assassin-cooldown-seconds", Duration.ofHours(1)),
+            duration(values, "assassin-invisibility-seconds", Duration.ofMinutes(10)),
+            duration(values, "assassin-double-jump-cooldown-seconds", Duration.ofSeconds(60)),
+            duration(values, "assassin-speed-seconds", Duration.ofSeconds(15)),
+            duration(values, "assassin-weakness-seconds", Duration.ofSeconds(20)),
+            integer(values, "assassin-weakness-level", 3),
+            duration(values, "fixer-cooldown-seconds", Duration.ofHours(1)),
+            duration(values, "fixer-effect-seconds", Duration.ofMinutes(10)),
+            integer(values, "fixer-strength-level", 1),
+            integer(values, "fixer-normal-heart-rows", 2),
+            integer(values, "fixer-near-tyrant-heart-rows", 3),
+            duration(values, "roster-intelligence-cooldown-seconds", Duration.ofHours(24)),
+            integer(values, "tyrant-strength-level", 1),
+            integer(values, "tyrant-resistance-level", 1),
+            integer(values, "follower-strength-cap", 5),
+            integer(values, "follower-resistance-cap", 4),
+            stringSet(values, "denied-mob-types", Set.of("ENDER_DRAGON", "WITHER")),
+            item(values, "assassin-item", new AbilityItemSettings("STICK", "Assassin Cloak")),
+            item(values, "fixer-item", new AbilityItemSettings("STICK", "Fixer's Wrench")),
+            item(values, "tamer-item", new AbilityItemSettings("FISHING_ROD", "Tamer's Lead")),
+            string(values, "recovery-command", "/tyrant item"),
+            string(
+                values,
+                "inventory-full-message",
+                "Your inventory is full. Make room and use /tyrant item."
+            ),
+            bool(values, "freeze-timers-while-paused", true)
+        );
+    }
+
+    private static AbilityItemSettings item(
+        Map<String, ?> values,
+        String key,
+        AbilityItemSettings defaultValue
+    ) {
+        Object raw = values.get(key);
+        if (raw == null) {
+            return defaultValue;
+        }
+        Map<?, ?> map;
+        if (raw instanceof ConfigurationSection section) {
+            map = section.getValues(false);
+        } else if (raw instanceof Map<?, ?> itemValues) {
+            map = itemValues;
+        } else {
+            throw new IllegalArgumentException(key + " must be a section");
+        }
+        Object material = map.get("material");
+        Object name = map.get("name");
+        return new AbilityItemSettings(
+            material == null ? defaultValue.material() : material.toString(),
+            name == null ? defaultValue.name() : name.toString()
+        );
+    }
+
+    private static double decimal(Map<String, ?> values, String key, double defaultValue) {
+        Object raw = values.get(key);
+        if (raw == null) {
+            return defaultValue;
+        }
+        if (!(raw instanceof Number number)) {
+            throw new IllegalArgumentException(key + " must be numeric");
+        }
+        return number.doubleValue();
+    }
+
+    private static int integer(Map<String, ?> values, String key, int defaultValue) {
+        Object raw = values.get(key);
+        if (raw == null) {
+            return defaultValue;
+        }
+        if (!(raw instanceof Number number)) {
+            throw new IllegalArgumentException(key + " must be an integer");
+        }
+        double value = number.doubleValue();
+        if (!Double.isFinite(value) || value != Math.rint(value)
+                || value < Integer.MIN_VALUE || value > Integer.MAX_VALUE) {
+            throw new IllegalArgumentException(key + " must be a 32-bit integer");
+        }
+        return number.intValue();
+    }
+
+    private static String string(Map<String, ?> values, String key, String defaultValue) {
+        Object raw = values.get(key);
+        return raw == null ? defaultValue : raw.toString();
+    }
+
+    private static boolean bool(Map<String, ?> values, String key, boolean defaultValue) {
+        Object raw = values.get(key);
+        if (raw == null) {
+            return defaultValue;
+        }
+        if (!(raw instanceof Boolean value)) {
+            throw new IllegalArgumentException(key + " must be true or false");
+        }
+        return value;
+    }
+
+    private static Set<String> stringSet(
+        Map<String, ?> values,
+        String key,
+        Set<String> defaultValue
+    ) {
+        Object raw = values.get(key);
+        if (raw == null) {
+            return defaultValue;
+        }
+        if (!(raw instanceof List<?> list)) {
+            throw new IllegalArgumentException(key + " must be a list");
+        }
+        return list.stream().map(Object::toString).collect(Collectors.toUnmodifiableSet());
+    }
+
+    private static void requirePositiveFinite(double value, String key) {
+        if (!Double.isFinite(value) || value <= 0.0) {
+            throw new IllegalArgumentException(key + " must be positive and finite");
+        }
+    }
+
+    private static void requirePositive(Duration value, String key) {
+        Objects.requireNonNull(value, key);
+        if (value.isZero() || value.isNegative()) {
+            throw new IllegalArgumentException(key + " must be positive");
+        }
+    }
+
+    private static void requireEffectLevel(int value, String key) {
+        if (value < 1 || value > 255) {
+            throw new IllegalArgumentException(key + " must be between 1 and 255");
+        }
+    }
+
+    private static void requireHeartRows(int value, String key) {
+        if (value < 1 || value > 100) {
+            throw new IllegalArgumentException(key + " must be between 1 and 100");
+        }
+    }
+
+    private static Set<String> normalizedSet(Set<String> values, String key) {
+        if (values == null || values.isEmpty()) {
+            throw new IllegalArgumentException(key + " must not be empty");
+        }
+        return values.stream()
+            .map(value -> requireText(value, key).toUpperCase(Locale.ROOT))
+            .collect(Collectors.toUnmodifiableSet());
+    }
+
+    private static String requireText(String value, String key) {
+        if (value == null || value.isBlank()) {
+            throw new IllegalArgumentException(key + " must not be blank");
+        }
+        return value.trim();
+    }
+
+    private static Duration duration(Map<String, ?> values, String key, Duration defaultValue) {
+        Object raw = values.get(key);
+        if (raw == null) {
+            return defaultValue;
+        }
+        if (!(raw instanceof Number number)) {
+            throw new IllegalArgumentException(key + " must be an integer number of seconds");
+        }
+        double seconds = number.doubleValue();
+        if (!Double.isFinite(seconds) || seconds != Math.rint(seconds)) {
+            throw new IllegalArgumentException(key + " must be an integer number of seconds");
+        }
+        return Duration.ofSeconds(number.longValue());
+    }
+
+    public record AbilityItemSettings(String material, String name) {
+        public AbilityItemSettings {
+            material = requireText(material, "item material").toUpperCase(Locale.ROOT);
+            name = requireText(name, "item name");
+        }
+    }
+}

src/main/java/games/dmg/spigottyrant/PluginSettingsValidator.java

@@ -0,0 +1,36 @@
+package games.dmg.spigottyrant;
+
+import org.bukkit.Material;
+import org.bukkit.entity.EntityType;
+
+public final class PluginSettingsValidator {
+    private PluginSettingsValidator() {
+    }
+
+    public static PluginSettings validate(PluginSettings settings) {
+        validateItem(settings.assassinItem(), "assassin-item");
+        validateItem(settings.fixerItem(), "fixer-item");
+        validateItem(settings.tamerItem(), "tamer-item");
+        for (String entityType : settings.deniedMobTypes()) {
+            try {
+                EntityType.valueOf(entityType);
+            } catch (IllegalArgumentException exception) {
+                throw new IllegalArgumentException(
+                    entityType + " in denied-mob-types is not a known entity type",
+                    exception
+                );
+            }
+        }
+        if (!settings.deniedMobTypes().contains("ENDER_DRAGON")) {
+            throw new IllegalArgumentException("denied-mob-types must include ENDER_DRAGON");
+        }
+        return settings;
+    }
+
+    private static void validateItem(PluginSettings.AbilityItemSettings item, String key) {
+        Material material = Material.matchMaterial(item.material());
+        if (material == null || material == Material.AIR) {
+            throw new IllegalArgumentException(key + " material must identify an item");
+        }
+    }
+}

src/main/java/games/dmg/spigottyrant/PurchaseResult.java

@@ -0,0 +1,10 @@
+package games.dmg.spigottyrant;
+
+import java.util.Objects;
+
+public record PurchaseResult(GameState state, PurchaseStatus status) {
+    public PurchaseResult {
+        Objects.requireNonNull(state, "state");
+        Objects.requireNonNull(status, "status");
+    }
+}

src/main/java/games/dmg/spigottyrant/PurchaseStatus.java

@@ -0,0 +1,9 @@
+package games.dmg.spigottyrant;
+
+public enum PurchaseStatus {
+    PURCHASED,
+    GAME_NOT_RUNNING,
+    NOT_TYRANT,
+    NO_CHOICES,
+    ALREADY_PURCHASED
+}

src/main/java/games/dmg/spigottyrant/SpigotTyrantPlugin.java

@@ -0,0 +1,60 @@
+package games.dmg.spigottyrant;
+
+import java.io.IOException;
+import java.time.Clock;
+import java.util.Map;
+import java.util.Objects;
+import java.util.logging.Level;
+import org.bukkit.plugin.java.JavaPlugin;
+
+public final class SpigotTyrantPlugin extends JavaPlugin {
+    private PluginSettings settings;
+    private TyrantStateManager stateManager;
+
+    @Override
+    public void onEnable() {
+        saveDefaultConfig();
+        try {
+            Map<String, Object> values = getConfig().getValues(false);
+            settings = PluginSettingsValidator.validate(PluginSettings.from(values));
+            stateManager = new TyrantStateManager(
+                new YamlTyrantStateRepository(getDataFolder().toPath().resolve("state.yml")),
+                getLogger()
+            );
+        } catch (IllegalArgumentException | IOException exception) {
+            getLogger().log(Level.SEVERE, "Could not initialize Spigot Tyrant", exception);
+            getServer().getPluginManager().disablePlugin(this);
+            return;
+        }
+
+        Objects.requireNonNull(getCommand("tyrant"), "Missing tyrant command metadata")
+            .setExecutor(new TyrantCommand(stateManager, new TyrantProgressionService()));
+        getServer().getPluginManager().registerEvents(
+            new PlayerJoinListener(stateManager, Clock.systemUTC()),
+            this
+        );
+        getServer().getScheduler().runTaskTimer(this, stateManager::saveIfDirty, 600L, 600L);
+        getLogger().info("Spigot Tyrant enabled.");
+    }
+
+    @Override
+    public void onDisable() {
+        if (stateManager != null) {
+            stateManager.saveIfDirty();
+        }
+    }
+
+    PluginSettings settings() {
+        if (settings == null) {
+            throw new IllegalStateException("Plugin settings are unavailable");
+        }
+        return settings;
+    }
+
+    TyrantStateManager stateManager() {
+        if (stateManager == null) {
+            throw new IllegalStateException("State manager is unavailable");
+        }
+        return stateManager;
+    }
+}

src/main/java/games/dmg/spigottyrant/TyrantClass.java

@@ -0,0 +1,8 @@
+package games.dmg.spigottyrant;
+
+public enum TyrantClass {
+    NONE,
+    ASSASSIN,
+    FIXER,
+    TAMER
+}

src/main/java/games/dmg/spigottyrant/TyrantCommand.java

@@ -0,0 +1,162 @@
+package games.dmg.spigottyrant;
+
+import java.time.Clock;
+import java.util.Locale;
+import org.bukkit.ChatColor;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandExecutor;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+public final class TyrantCommand implements CommandExecutor {
+    private final TyrantStateManager stateManager;
+    private final TyrantProgressionService progression;
+    private final ClassAssignmentService assignments;
+    private final OnlinePlayerDirectory onlinePlayers;
+    private final Clock clock;
+
+    public TyrantCommand(
+        TyrantStateManager stateManager,
+        TyrantProgressionService progression
+    ) {
+        this(
+            stateManager,
+            progression,
+            new ClassAssignmentService(),
+            new BukkitOnlinePlayerDirectory(),
+            Clock.systemUTC()
+        );
+    }
+
+    TyrantCommand(
+        TyrantStateManager stateManager,
+        TyrantProgressionService progression,
+        ClassAssignmentService assignments,
+        OnlinePlayerDirectory onlinePlayers,
+        Clock clock
+    ) {
+        this.stateManager = stateManager;
+        this.progression = progression;
+        this.assignments = assignments;
+        this.onlinePlayers = onlinePlayers;
+        this.clock = clock;
+    }
+
+    @Override
+    public boolean onCommand(
+        CommandSender sender,
+        Command command,
+        String label,
+        String[] arguments
+    ) {
+        if (!(sender instanceof Player player)) {
+            sender.sendMessage("This command must be used by a player.");
+            return true;
+        }
+        if (arguments.length == 0 || arguments[0].equalsIgnoreCase("choices")) {
+            showChoices(player);
+            return true;
+        }
+        if (arguments.length == 2 && arguments[0].equalsIgnoreCase("buy")) {
+            buy(player, arguments[1]);
+            return true;
+        }
+        if (arguments.length == 3 && arguments[0].equalsIgnoreCase("assign")) {
+            assign(player, arguments[1], arguments[2]);
+            return true;
+        }
+        player.sendMessage(
+            ChatColor.YELLOW
+                + "Usage: /tyrant choices | /tyrant buy <unlock> | "
+                + "/tyrant assign <class> <player>"
+        );
+        return true;
+    }
+
+    private void showChoices(Player player) {
+        GameState state = stateManager.game();
+        player.sendMessage(ChatColor.GOLD + "Tyrant unlock choices: " + state.unspentChoices());
+        for (TyrantUnlock unlock : TyrantUnlock.values()) {
+            String status;
+            if (state.purchases().contains(unlock)) {
+                status = "PURCHASED";
+            } else if (state.lifecycle() == GameLifecycle.RUNNING
+                    && state.tyrantId().filter(player.getUniqueId()::equals).isPresent()
+                    && state.unspentChoices() > 0) {
+                status = "AVAILABLE";
+            } else {
+                status = "LOCKED";
+            }
+            player.sendMessage(ChatColor.YELLOW + "[" + status + "] " + unlock.name());
+        }
+    }
+
+    private void buy(Player player, String requestedUnlock) {
+        TyrantUnlock unlock;
+        try {
+            unlock = TyrantUnlock.valueOf(requestedUnlock.toUpperCase(Locale.ROOT));
+        } catch (IllegalArgumentException exception) {
+            player.sendMessage(ChatColor.RED + "Unknown unlock. Use /tyrant choices.");
+            return;
+        }
+        PurchaseResult[] result = new PurchaseResult[1];
+        stateManager.updateGame(current -> {
+            result[0] = progression.purchase(current, player.getUniqueId(), unlock);
+            return result[0].state();
+        });
+        if (result[0].status() == PurchaseStatus.PURCHASED) {
+            stateManager.saveIfDirty();
+            player.sendMessage(ChatColor.GREEN + "Purchased " + unlock.name() + ".");
+        } else {
+            player.sendMessage(
+                ChatColor.RED + "Could not purchase " + unlock.name() + ": "
+                    + readable(result[0].status())
+            );
+        }
+    }
+
+    private void assign(Player tyrant, String requestedClass, String targetName) {
+        TyrantClass tyrantClass;
+        try {
+            tyrantClass = TyrantClass.valueOf(requestedClass.toUpperCase(Locale.ROOT));
+        } catch (IllegalArgumentException exception) {
+            tyrant.sendMessage(ChatColor.RED + "Unknown class. Use assassin, fixer, or tamer.");
+            return;
+        }
+        Player target = onlinePlayers.findByName(targetName);
+        if (target == null) {
+            tyrant.sendMessage(ChatColor.RED + "That player must be online.");
+            return;
+        }
+        stateManager.player(target.getUniqueId(), target.getName());
+        ClassAssignmentResult result = assignments.assign(
+            stateManager.game(),
+            stateManager.players(),
+            tyrant.getUniqueId(),
+            target.getUniqueId(),
+            tyrantClass,
+            clock.instant()
+        );
+        if (result.status() != ClassAssignmentStatus.ASSIGNED) {
+            tyrant.sendMessage(
+                ChatColor.RED + "Could not assign " + tyrantClass.name() + ": "
+                    + readable(result.status())
+            );
+            return;
+        }
+        stateManager.replacePlayers(result.players());
+        stateManager.saveIfDirty();
+        result.previousHolderId().map(onlinePlayers::findById).ifPresent(previous ->
+            previous.sendMessage(ChatColor.YELLOW + "You are no longer the "
+                + tyrantClass.name() + ".")
+        );
+        target.sendMessage(ChatColor.GREEN + "You are now the " + tyrantClass.name() + ".");
+        tyrant.sendMessage(
+            ChatColor.GREEN + "Assigned " + tyrantClass.name() + " to " + target.getName() + "."
+        );
+    }
+
+    private static String readable(Enum<?> status) {
+        return status.name().toLowerCase(Locale.ROOT).replace('_', ' ');
+    }
+}

src/main/java/games/dmg/spigottyrant/TyrantProgressionService.java

@@ -0,0 +1,75 @@
+package games.dmg.spigottyrant;
+
+import java.util.Optional;
+import java.util.UUID;
+
+public final class TyrantProgressionService {
+    public GameState recordVigilanteDeath(GameState state, Optional<UUID> killerId) {
+        if (state.lifecycle() != GameLifecycle.RUNNING
+                || state.tyrantId().isEmpty()
+                || state.vigilanteId().isEmpty()
+                || killerId.isEmpty()
+                || !state.tyrantId().orElseThrow().equals(killerId.orElseThrow())) {
+            return state;
+        }
+        return copyProgress(
+            state,
+            state.tyrantLevel() + 1,
+            state.unspentChoices() + 1,
+            state.purchases()
+        );
+    }
+
+    public PurchaseResult purchase(
+        GameState state,
+        UUID buyerId,
+        TyrantUnlock unlock
+    ) {
+        if (state.lifecycle() != GameLifecycle.RUNNING) {
+            return new PurchaseResult(state, PurchaseStatus.GAME_NOT_RUNNING);
+        }
+        if (state.tyrantId().isEmpty() || !state.tyrantId().orElseThrow().equals(buyerId)) {
+            return new PurchaseResult(state, PurchaseStatus.NOT_TYRANT);
+        }
+        if (state.purchases().contains(unlock)) {
+            return new PurchaseResult(state, PurchaseStatus.ALREADY_PURCHASED);
+        }
+        if (state.unspentChoices() == 0) {
+            return new PurchaseResult(state, PurchaseStatus.NO_CHOICES);
+        }
+        java.util.Set<TyrantUnlock> purchases = java.util.EnumSet.noneOf(TyrantUnlock.class);
+        purchases.addAll(state.purchases());
+        purchases.add(unlock);
+        GameState updated = copyProgress(
+            state,
+            state.tyrantLevel(),
+            state.unspentChoices() - 1,
+            purchases
+        );
+        return new PurchaseResult(updated, PurchaseStatus.PURCHASED);
+    }
+
+    public GameState resetReignProgression(GameState state) {
+        return copyProgress(state, 0, 0, java.util.Set.of());
+    }
+
+    private static GameState copyProgress(
+        GameState state,
+        int level,
+        int choices,
+        java.util.Set<TyrantUnlock> purchases
+    ) {
+        return new GameState(
+            state.lifecycle(),
+            state.tyrantId(),
+            state.vigilanteId(),
+            state.pendingTyrant(),
+            state.pendingVigilante(),
+            state.pausedAt(),
+            state.accumulatedPausedTime(),
+            level,
+            choices,
+            purchases
+        );
+    }
+}

src/main/java/games/dmg/spigottyrant/TyrantStateManager.java

@@ -0,0 +1,106 @@
+package games.dmg.spigottyrant;
+
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
+import java.util.function.UnaryOperator;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+public final class TyrantStateManager {
+    private final YamlTyrantStateRepository repository;
+    private final Logger logger;
+    private final Map<UUID, PlayerState> players;
+    private GameState game;
+    private boolean dirty;
+
+    public TyrantStateManager(
+        YamlTyrantStateRepository repository,
+        Logger logger
+    ) throws IOException {
+        this.repository = repository;
+        this.logger = logger;
+        PersistentState state = repository.load();
+        game = state.game();
+        players = new HashMap<>(state.players());
+    }
+
+    public GameState game() {
+        return game;
+    }
+
+    public Map<UUID, PlayerState> players() {
+        return Map.copyOf(players);
+    }
+
+    public PlayerState player(UUID playerId, String latestName) {
+        PlayerState current = players.get(playerId);
+        if (current == null) {
+            current = PlayerState.newPlayer(playerId, latestName);
+            players.put(playerId, current);
+            dirty = true;
+            return current;
+        }
+        if (!current.latestName().equals(latestName)) {
+            current = copyWithName(current, latestName);
+            players.put(playerId, current);
+            dirty = true;
+        }
+        return current;
+    }
+
+    public PlayerState updatePlayer(
+        UUID playerId,
+        String latestName,
+        UnaryOperator<PlayerState> update
+    ) {
+        PlayerState changed = update.apply(player(playerId, latestName));
+        if (!playerId.equals(changed.playerId())) {
+            throw new IllegalArgumentException("updated player ID cannot change");
+        }
+        players.put(playerId, changed);
+        dirty = true;
+        return changed;
+    }
+
+    public void replacePlayers(Map<UUID, PlayerState> replacement) {
+        players.clear();
+        players.putAll(replacement);
+        dirty = true;
+    }
+
+    public GameState updateGame(UnaryOperator<GameState> update) {
+        game = update.apply(game);
+        dirty = true;
+        return game;
+    }
+
+    public boolean saveIfDirty() {
+        if (!dirty) {
+            return true;
+        }
+        try {
+            repository.save(new PersistentState(game, players));
+            dirty = false;
+            return true;
+        } catch (IOException exception) {
+            logger.log(Level.SEVERE, "Could not save Spigot Tyrant state", exception);
+            return false;
+        }
+    }
+
+    private static PlayerState copyWithName(PlayerState player, String latestName) {
+        return new PlayerState(
+            player.playerId(),
+            latestName,
+            player.lastLogin(),
+            player.optedOutUntil(),
+            player.tyrantClass(),
+            player.followerOf(),
+            player.cooldownEnds(),
+            player.readyAbilityItems(),
+            player.capturedMobs()
+        );
+    }
+}

src/main/java/games/dmg/spigottyrant/TyrantUnlock.java

@@ -0,0 +1,10 @@
+package games.dmg.spigottyrant;
+
+public enum TyrantUnlock {
+    ASSASSIN,
+    FIXER,
+    TAMER,
+    ROSTER_INTELLIGENCE,
+    RESISTANCE,
+    STRENGTH
+}

src/main/java/games/dmg/spigottyrant/YamlTyrantStateRepository.java

@@ -0,0 +1,335 @@
+package games.dmg.spigottyrant;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.StandardCopyOption;
+import java.time.Duration;
+import java.time.Instant;
+import java.time.format.DateTimeParseException;
+import java.util.ArrayList;
+import java.util.EnumMap;
+import java.util.EnumSet;
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+import java.util.UUID;
+import org.bukkit.configuration.ConfigurationSection;
+import org.bukkit.configuration.InvalidConfigurationException;
+import org.bukkit.configuration.file.YamlConfiguration;
+import org.bukkit.entity.EntityType;
+
+public final class YamlTyrantStateRepository {
+    private static final String PLAYERS = "players";
+    private final Path stateFile;
+
+    public YamlTyrantStateRepository(Path stateFile) {
+        this.stateFile = stateFile;
+    }
+
+    public PersistentState load() throws IOException {
+        if (!Files.exists(stateFile)) {
+            return PersistentState.empty();
+        }
+        YamlConfiguration yaml = loadYaml();
+        return new PersistentState(loadGameSafely(yaml), loadPlayers(yaml));
+    }
+
+    public void save(PersistentState state) throws IOException {
+        Path parent = stateFile.toAbsolutePath().getParent();
+        if (parent != null) {
+            Files.createDirectories(parent);
+        }
+        YamlConfiguration yaml = Files.exists(stateFile) ? loadYaml() : new YamlConfiguration();
+        saveGame(yaml, state.game());
+        removeAbsentPlayers(yaml, state.players().keySet());
+        for (PlayerState player : state.players().values()) {
+            savePlayer(yaml, player);
+        }
+
+        Path temporary = Files.createTempFile(parent, "spigot-tyrant-state-", ".yml");
+        try {
+            yaml.save(temporary.toFile());
+            try {
+                Files.move(
+                    temporary,
+                    stateFile,
+                    StandardCopyOption.REPLACE_EXISTING,
+                    StandardCopyOption.ATOMIC_MOVE
+                );
+            } catch (IOException atomicMoveFailure) {
+                Files.move(temporary, stateFile, StandardCopyOption.REPLACE_EXISTING);
+            }
+        } finally {
+            Files.deleteIfExists(temporary);
+        }
+    }
+
+    private YamlConfiguration loadYaml() throws IOException {
+        YamlConfiguration yaml = new YamlConfiguration();
+        try {
+            yaml.load(stateFile.toFile());
+            return yaml;
+        } catch (InvalidConfigurationException exception) {
+            throw new IOException("state file is not valid YAML", exception);
+        }
+    }
+
+    private static GameState loadGameSafely(YamlConfiguration yaml) {
+        try {
+            GameLifecycle lifecycle = enumValue(
+                GameLifecycle.class,
+                yaml.getString("game.lifecycle"),
+                GameLifecycle.UNSTARTED
+            );
+            return new GameState(
+                lifecycle,
+                uuid(yaml.getString("game.tyrant-id")),
+                uuid(yaml.getString("game.vigilante-id")),
+                pending(yaml, "game.pending-tyrant"),
+                pending(yaml, "game.pending-vigilante"),
+                instant(yaml.getString("game.paused-at")),
+                Duration.ofSeconds(nonNegativeLong(yaml, "game.accumulated-paused-seconds")),
+                nonNegativeInt(yaml, "game.tyrant-level"),
+                nonNegativeInt(yaml, "game.unspent-choices"),
+                enumSet(TyrantUnlock.class, yaml.getStringList("game.purchases"))
+            );
+        } catch (IllegalArgumentException exception) {
+            return GameState.empty();
+        }
+    }
+
+    private static Map<UUID, PlayerState> loadPlayers(YamlConfiguration yaml) {
+        Map<UUID, PlayerState> players = new HashMap<>();
+        ConfigurationSection section = yaml.getConfigurationSection(PLAYERS);
+        if (section == null) {
+            return players;
+        }
+        for (String key : section.getKeys(false)) {
+            try {
+                UUID playerId = UUID.fromString(key);
+                String path = PLAYERS + "." + key;
+                String name = requireText(yaml.getString(path + ".name"), "player name");
+                PlayerState player = new PlayerState(
+                    playerId,
+                    name,
+                    instant(yaml.getString(path + ".last-login")),
+                    instant(yaml.getString(path + ".opted-out-until")),
+                    enumValue(
+                        TyrantClass.class,
+                        yaml.getString(path + ".tyrant-class"),
+                        TyrantClass.NONE
+                    ),
+                    uuid(yaml.getString(path + ".follower-of")),
+                    loadCooldowns(yaml, path + ".cooldowns"),
+                    enumSet(Ability.class, yaml.getStringList(path + ".ready-ability-items")),
+                    loadCapturedMobs(yaml.getMapList(path + ".captured-mobs"))
+                );
+                players.put(playerId, player);
+            } catch (IllegalArgumentException ignored) {
+                // Invalid player records grant no state.
+            }
+        }
+        return players;
+    }
+
+    private static Map<Ability, Instant> loadCooldowns(YamlConfiguration yaml, String path) {
+        Map<Ability, Instant> cooldowns = new EnumMap<>(Ability.class);
+        ConfigurationSection section = yaml.getConfigurationSection(path);
+        if (section == null) {
+            return cooldowns;
+        }
+        for (String key : section.getKeys(false)) {
+            Ability ability = enumValue(Ability.class, key, null);
+            Optional<Instant> end = instant(yaml.getString(path + "." + key));
+            if (ability != null && end.isPresent()) {
+                cooldowns.put(ability, end.orElseThrow());
+            }
+        }
+        return cooldowns;
+    }
+
+    private static List<CapturedMob> loadCapturedMobs(List<Map<?, ?>> rawMobs) {
+        List<CapturedMob> mobs = new ArrayList<>();
+        for (Map<?, ?> raw : rawMobs) {
+            try {
+                String type = requireText(
+                    raw.get("entity-type") == null ? null : raw.get("entity-type").toString(),
+                    "captured mob entity type"
+                );
+                EntityType entityType = EntityType.valueOf(type.toUpperCase(java.util.Locale.ROOT));
+                if (entityType == EntityType.ENDER_DRAGON) {
+                    continue;
+                }
+                Map<String, String> data = new HashMap<>();
+                Object rawData = raw.get("data");
+                if (rawData instanceof Map<?, ?> values) {
+                    for (Map.Entry<?, ?> entry : values.entrySet()) {
+                        if (entry.getKey() != null && entry.getValue() != null) {
+                            data.put(entry.getKey().toString(), entry.getValue().toString());
+                        }
+                    }
+                }
+                mobs.add(new CapturedMob(entityType.name(), data));
+            } catch (IllegalArgumentException ignored) {
+                // Unknown or malformed entities are not restored.
+            }
+        }
+        return List.copyOf(mobs);
+    }
+
+    private static void saveGame(YamlConfiguration yaml, GameState game) {
+        yaml.set("game.lifecycle", game.lifecycle().name());
+        yaml.set("game.tyrant-id", text(game.tyrantId()));
+        yaml.set("game.vigilante-id", text(game.vigilanteId()));
+        savePending(yaml, "game.pending-tyrant", game.pendingTyrant());
+        savePending(yaml, "game.pending-vigilante", game.pendingVigilante());
+        yaml.set("game.paused-at", instantText(game.pausedAt()));
+        yaml.set("game.accumulated-paused-seconds", game.accumulatedPausedTime().toSeconds());
+        yaml.set("game.tyrant-level", game.tyrantLevel());
+        yaml.set("game.unspent-choices", game.unspentChoices());
+        yaml.set("game.purchases", game.purchases().stream().map(Enum::name).sorted().toList());
+    }
+
+    private static void savePlayer(YamlConfiguration yaml, PlayerState player) {
+        String path = PLAYERS + "." + player.playerId();
+        yaml.set(path + ".name", player.latestName());
+        yaml.set(path + ".last-login", instantText(player.lastLogin()));
+        yaml.set(path + ".opted-out-until", instantText(player.optedOutUntil()));
+        yaml.set(path + ".tyrant-class", player.tyrantClass().name());
+        yaml.set(path + ".follower-of", text(player.followerOf()));
+        yaml.set(path + ".cooldowns", null);
+        for (Map.Entry<Ability, Instant> cooldown : player.cooldownEnds().entrySet()) {
+            yaml.set(path + ".cooldowns." + cooldown.getKey().name(), cooldown.getValue().toString());
+        }
+        yaml.set(
+            path + ".ready-ability-items",
+            player.readyAbilityItems().stream().map(Enum::name).sorted().toList()
+        );
+        List<Map<String, Object>> mobs = new ArrayList<>();
+        for (CapturedMob mob : player.capturedMobs()) {
+            Map<String, Object> serialized = new LinkedHashMap<>();
+            serialized.put("entity-type", mob.entityType());
+            serialized.put("data", mob.data());
+            mobs.add(serialized);
+        }
+        yaml.set(path + ".captured-mobs", mobs);
+    }
+
+    private static void removeAbsentPlayers(YamlConfiguration yaml, Set<UUID> retained) {
+        ConfigurationSection section = yaml.getConfigurationSection(PLAYERS);
+        if (section == null) {
+            return;
+        }
+        for (String key : section.getKeys(false)) {
+            try {
+                if (!retained.contains(UUID.fromString(key))) {
+                    yaml.set(PLAYERS + "." + key, null);
+                }
+            } catch (IllegalArgumentException exception) {
+                yaml.set(PLAYERS + "." + key, null);
+            }
+        }
+    }
+
+    private static Optional<PendingSelection> pending(YamlConfiguration yaml, String path) {
+        Optional<UUID> candidate = uuid(yaml.getString(path + ".candidate-id"));
+        Optional<Instant> expiresAt = instant(yaml.getString(path + ".expires-at"));
+        if (candidate.isEmpty() && expiresAt.isEmpty()) {
+            return Optional.empty();
+        }
+        if (candidate.isEmpty() || expiresAt.isEmpty()) {
+            throw new IllegalArgumentException("incomplete pending selection");
+        }
+        return Optional.of(new PendingSelection(candidate.orElseThrow(), expiresAt.orElseThrow()));
+    }
+
+    private static void savePending(
+        YamlConfiguration yaml,
+        String path,
+        Optional<PendingSelection> pending
+    ) {
+        yaml.set(path, null);
+        pending.ifPresent(selection -> {
+            yaml.set(path + ".candidate-id", selection.candidateId().toString());
+            yaml.set(path + ".expires-at", selection.expiresAt().toString());
+        });
+    }
+
+    private static Optional<UUID> uuid(String value) {
+        if (value == null || value.isBlank()) {
+            return Optional.empty();
+        }
+        return Optional.of(UUID.fromString(value));
+    }
+
+    private static Optional<Instant> instant(String value) {
+        if (value == null || value.isBlank()) {
+            return Optional.empty();
+        }
+        try {
+            return Optional.of(Instant.parse(value));
+        } catch (DateTimeParseException exception) {
+            throw new IllegalArgumentException("invalid RFC 3339 instant", exception);
+        }
+    }
+
+    private static String instantText(Optional<Instant> value) {
+        return value.map(Instant::toString).orElse(null);
+    }
+
+    private static String text(Optional<UUID> value) {
+        return value.map(UUID::toString).orElse(null);
+    }
+
+    private static int nonNegativeInt(YamlConfiguration yaml, String path) {
+        if (!yaml.isInt(path)) {
+            return 0;
+        }
+        int value = yaml.getInt(path);
+        if (value < 0) {
+            throw new IllegalArgumentException(path + " must not be negative");
+        }
+        return value;
+    }
+
+    private static long nonNegativeLong(YamlConfiguration yaml, String path) {
+        if (!yaml.isLong(path) && !yaml.isInt(path)) {
+            return 0L;
+        }
+        long value = yaml.getLong(path);
+        if (value < 0L) {
+            throw new IllegalArgumentException(path + " must not be negative");
+        }
+        return value;
+    }
+
+    private static <E extends Enum<E>> E enumValue(
+        Class<E> type,
+        String value,
+        E defaultValue
+    ) {
+        if (value == null || value.isBlank()) {
+            return defaultValue;
+        }
+        return Enum.valueOf(type, value.trim().toUpperCase(java.util.Locale.ROOT));
+    }
+
+    private static <E extends Enum<E>> Set<E> enumSet(Class<E> type, List<String> values) {
+        Set<E> result = EnumSet.noneOf(type);
+        for (String value : values) {
+            result.add(enumValue(type, value, null));
+        }
+        return Set.copyOf(result);
+    }
+
+    private static String requireText(String value, String description) {
+        if (value == null || value.isBlank()) {
+            throw new IllegalArgumentException(description + " must not be blank");
+        }
+        return value.trim();
+    }
+}

src/main/resources/config.yml

@@ -0,0 +1,51 @@
+# Proximity ranges
+tyrant-range-blocks: 50
+follower-range-blocks: 50
+
+# Participation, inactivity, and selection
+opt-out-seconds: 604800
+role-inactivity-seconds: 172800
+candidate-activity-window-seconds: 86400
+pending-selection-timeout-seconds: 86400
+selection-retry-seconds: 60
+freeze-timers-while-paused: true
+
+# Assassin
+assassin-cooldown-seconds: 3600
+assassin-invisibility-seconds: 600
+assassin-double-jump-cooldown-seconds: 60
+assassin-speed-seconds: 15
+assassin-weakness-seconds: 20
+assassin-weakness-level: 3
+assassin-item:
+  material: STICK
+  name: Assassin Cloak
+
+# Fixer
+fixer-cooldown-seconds: 3600
+fixer-effect-seconds: 600
+fixer-strength-level: 1
+fixer-normal-heart-rows: 2
+fixer-near-tyrant-heart-rows: 3
+fixer-item:
+  material: STICK
+  name: Fixer's Wrench
+
+# Tamer
+tamer-item:
+  material: FISHING_ROD
+  name: Tamer's Lead
+denied-mob-types:
+  - ENDER_DRAGON
+  - WITHER
+
+# Tyrant and Vigilante effects
+roster-intelligence-cooldown-seconds: 86400
+tyrant-strength-level: 1
+tyrant-resistance-level: 1
+follower-strength-cap: 5
+follower-resistance-cap: 4
+
+# Bound item recovery and delivery messages
+recovery-command: /tyrant item
+inventory-full-message: Your inventory is full. Make room and use /tyrant item.

src/main/resources/plugin.yml

@@ -0,0 +1,10 @@
+name: SpigotTyrant
+version: ${version}
+main: games.dmg.spigottyrant.SpigotTyrantPlugin
+api-version: "1.20"
+description: Asymmetric Tyrant, Vigilante, Follower, and specialist class gameplay.
+author: dmg.games
+commands:
+  tyrant:
+    description: View and use Spigot Tyrant game features.
+    usage: /tyrant [choices|buy <unlock>|assign <class> <player>]

src/test/java/games/dmg/spigottyrant/ClassAssignmentMessagesTest.java

@@ -0,0 +1,29 @@
+package games.dmg.spigottyrant;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.util.UUID;
+import org.junit.jupiter.api.Test;
+
+final class ClassAssignmentMessagesTest {
+    @Test
+    void loginReminderNamesClassAndControls() {
+        PlayerState assassin = new PlayerState(
+            UUID.fromString("11111111-1111-1111-1111-111111111111"),
+            "Player",
+            java.util.Optional.empty(),
+            java.util.Optional.empty(),
+            TyrantClass.ASSASSIN,
+            java.util.Optional.empty(),
+            java.util.Map.of(),
+            java.util.Set.of(),
+            java.util.List.of()
+        );
+
+        assertEquals(
+            "Class: ASSASSIN. Use your Assassin Cloak; double-jump while airborne. "
+                + "Use /tyrant item to recover ready class items.",
+            ClassAssignmentMessages.loginReminder(assassin)
+        );
+    }
+}

src/test/java/games/dmg/spigottyrant/ClassAssignmentServiceTest.java

@@ -0,0 +1,127 @@
+package games.dmg.spigottyrant;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.time.Duration;
+import java.time.Instant;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+import java.util.UUID;
+import org.junit.jupiter.api.Test;
+
+final class ClassAssignmentServiceTest {
+    private static final UUID TYRANT = UUID.fromString("11111111-1111-1111-1111-111111111111");
+    private static final UUID VIGILANTE = UUID.fromString("22222222-2222-2222-2222-222222222222");
+    private static final UUID FOLLOWER = UUID.fromString("33333333-3333-3333-3333-333333333333");
+    private static final Instant NOW = Instant.parse("2026-08-14T12:00:00Z");
+    private final ClassAssignmentService service = new ClassAssignmentService();
+
+    @Test
+    void purchasedClassCanBeAssignedToVigilanteOrFollower() {
+        GameState game = gameWith(TyrantUnlock.ASSASSIN);
+        PlayerState vigilante = PlayerState.newPlayer(VIGILANTE, "Vigilante");
+        PlayerState follower = withFollower(
+            PlayerState.newPlayer(FOLLOWER, "Follower"),
+            VIGILANTE
+        );
+
+        ClassAssignmentResult vigilanteResult = service.assign(
+            game,
+            Map.of(VIGILANTE, vigilante, FOLLOWER, follower),
+            TYRANT,
+            VIGILANTE,
+            TyrantClass.ASSASSIN,
+            NOW
+        );
+        ClassAssignmentResult followerResult = service.assign(
+            game,
+            vigilanteResult.players(),
+            TYRANT,
+            FOLLOWER,
+            TyrantClass.ASSASSIN,
+            NOW
+        );
+
+        assertEquals(ClassAssignmentStatus.ASSIGNED, vigilanteResult.status());
+        assertEquals(TyrantClass.ASSASSIN,
+            vigilanteResult.players().get(VIGILANTE).tyrantClass());
+        assertEquals(ClassAssignmentStatus.ASSIGNED, followerResult.status());
+        assertEquals(TyrantClass.NONE,
+            followerResult.players().get(VIGILANTE).tyrantClass());
+        assertEquals(TyrantClass.ASSASSIN,
+            followerResult.players().get(FOLLOWER).tyrantClass());
+        assertEquals(Optional.of(VIGILANTE), followerResult.previousHolderId());
+    }
+
+    @Test
+    void rejectsLockedSelfAndOptedOutAssignments() {
+        PlayerState target = PlayerState.newPlayer(FOLLOWER, "Target");
+        PlayerState optedOut = new PlayerState(
+            target.playerId(), target.latestName(), target.lastLogin(),
+            Optional.of(NOW.plusSeconds(60)), target.tyrantClass(), target.followerOf(),
+            target.cooldownEnds(), target.readyAbilityItems(), target.capturedMobs()
+        );
+
+        assertEquals(ClassAssignmentStatus.CLASS_NOT_UNLOCKED, service.assign(
+            gameWith(TyrantUnlock.FIXER), Map.of(FOLLOWER, target), TYRANT, FOLLOWER,
+            TyrantClass.ASSASSIN, NOW
+        ).status());
+        assertEquals(ClassAssignmentStatus.TARGET_IS_TYRANT, service.assign(
+            gameWith(TyrantUnlock.ASSASSIN), Map.of(TYRANT,
+                PlayerState.newPlayer(TYRANT, "Tyrant")), TYRANT, TYRANT,
+            TyrantClass.ASSASSIN, NOW
+        ).status());
+        assertEquals(ClassAssignmentStatus.TARGET_OPTED_OUT, service.assign(
+            gameWith(TyrantUnlock.ASSASSIN), Map.of(FOLLOWER, optedOut), TYRANT,
+            FOLLOWER, TyrantClass.ASSASSIN, NOW
+        ).status());
+    }
+
+    @Test
+    void reassignmentAndReignEndClearClassAbilityState() {
+        Instant cooldown = NOW.plusSeconds(3600);
+        PlayerState holder = new PlayerState(
+            VIGILANTE, "Holder", Optional.empty(), Optional.empty(),
+            TyrantClass.ASSASSIN, Optional.empty(),
+            Map.of(Ability.ASSASSIN_INVISIBILITY, cooldown),
+            Set.of(Ability.ASSASSIN_INVISIBILITY), java.util.List.of()
+        );
+        PlayerState replacement = PlayerState.newPlayer(FOLLOWER, "Replacement");
+
+        ClassAssignmentResult reassigned = service.assign(
+            gameWith(TyrantUnlock.ASSASSIN),
+            Map.of(VIGILANTE, holder, FOLLOWER, replacement),
+            TYRANT, FOLLOWER, TyrantClass.ASSASSIN, NOW
+        );
+        PlayerState former = reassigned.players().get(VIGILANTE);
+        Map<UUID, PlayerState> cleared = service.clearAll(reassigned.players());
+
+        assertEquals(Map.of(), former.cooldownEnds());
+        assertEquals(Set.of(), former.readyAbilityItems());
+        assertEquals(TyrantClass.NONE, cleared.get(FOLLOWER).tyrantClass());
+    }
+
+    private static GameState gameWith(TyrantUnlock unlock) {
+        return new GameState(
+            GameLifecycle.RUNNING,
+            Optional.of(TYRANT),
+            Optional.of(VIGILANTE),
+            Optional.empty(),
+            Optional.empty(),
+            Optional.empty(),
+            Duration.ZERO,
+            1,
+            0,
+            Set.of(unlock)
+        );
+    }
+
+    private static PlayerState withFollower(PlayerState player, UUID vigilanteId) {
+        return new PlayerState(
+            player.playerId(), player.latestName(), player.lastLogin(), player.optedOutUntil(),
+            player.tyrantClass(), Optional.of(vigilanteId), player.cooldownEnds(),
+            player.readyAbilityItems(), player.capturedMobs()
+        );
+    }
+}

src/test/java/games/dmg/spigottyrant/DefaultConfigurationTest.java

@@ -0,0 +1,39 @@
+package games.dmg.spigottyrant;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+import java.io.InputStream;
+import java.time.Duration;
+import java.util.Map;
+import org.bukkit.configuration.file.YamlConfiguration;
+import org.junit.jupiter.api.Test;
+import org.yaml.snakeyaml.Yaml;
+
+final class DefaultConfigurationTest {
+    @Test
+    void bundledConfigurationIsCompleteAndValid() {
+        InputStream stream = getClass().getClassLoader().getResourceAsStream("config.yml");
+        assertNotNull(stream);
+
+        Map<String, ?> values = new Yaml().load(stream);
+        PluginSettings settings = PluginSettings.from(values);
+        assertEquals(50.0, settings.tyrantRangeBlocks());
+        assertEquals(Duration.ofDays(7), settings.optOutDuration());
+        assertEquals("FISHING_ROD", settings.tamerItem().material());
+    }
+
+    @Test
+    void acceptsNestedSectionsAsBukkitProvidesThem() throws Exception {
+        InputStream stream = getClass().getClassLoader().getResourceAsStream("config.yml");
+        assertNotNull(stream);
+        String yamlText = new String(stream.readAllBytes(), java.nio.charset.StandardCharsets.UTF_8);
+        YamlConfiguration yaml = new YamlConfiguration();
+        yaml.loadFromString(yamlText);
+
+        PluginSettings settings = PluginSettings.from(yaml.getValues(false));
+
+        assertEquals("Assassin Cloak", settings.assassinItem().name());
+        assertEquals("Fixer's Wrench", settings.fixerItem().name());
+    }
+}

src/test/java/games/dmg/spigottyrant/PauseAwareTimeTest.java

@@ -0,0 +1,20 @@
+package games.dmg.spigottyrant;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.time.Duration;
+import java.time.Instant;
+import org.junit.jupiter.api.Test;
+
+final class PauseAwareTimeTest {
+    @Test
+    void shiftsDeadlineByTimeSpentPaused() {
+        Instant pausedAt = Instant.parse("2026-08-14T12:00:00Z");
+        Instant resumedAt = pausedAt.plus(Duration.ofHours(3));
+        Instant originalDeadline = pausedAt.plus(Duration.ofMinutes(30));
+
+        Instant shifted = PauseAwareTime.shiftDeadline(originalDeadline, pausedAt, resumedAt);
+
+        assertEquals(originalDeadline.plus(Duration.ofHours(3)), shifted);
+    }
+}

src/test/java/games/dmg/spigottyrant/PluginMetadataTest.java

@@ -0,0 +1,34 @@
+package games.dmg.spigottyrant;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.io.InputStream;
+import java.util.Map;
+import org.bukkit.plugin.java.JavaPlugin;
+import org.junit.jupiter.api.Test;
+import org.yaml.snakeyaml.Yaml;
+
+final class PluginMetadataTest {
+    @Test
+    void declaresTyrantPluginMetadata() {
+        InputStream stream = getClass().getClassLoader().getResourceAsStream("plugin.yml");
+        assertNotNull(stream);
+
+        Map<?, ?> plugin = new Yaml().load(stream);
+        assertEquals("SpigotTyrant", plugin.get("name"));
+        assertEquals("games.dmg.spigottyrant.SpigotTyrantPlugin", plugin.get("main"));
+        assertEquals("1.20", plugin.get("api-version"));
+        Map<?, ?> commands = (Map<?, ?>) plugin.get("commands");
+        assertNotNull(commands);
+        assertNotNull(commands.get("tyrant"));
+    }
+
+    @Test
+    void declaredEntrypointIsAJavaPlugin() throws ClassNotFoundException {
+        Class<?> entrypoint = Class.forName("games.dmg.spigottyrant.SpigotTyrantPlugin");
+
+        assertTrue(JavaPlugin.class.isAssignableFrom(entrypoint));
+    }
+}

src/test/java/games/dmg/spigottyrant/PluginSettingsTest.java

@@ -0,0 +1,67 @@
+package games.dmg.spigottyrant;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import java.time.Duration;
+import java.util.Map;
+import java.util.Set;
+import org.junit.jupiter.api.Test;
+
+final class PluginSettingsTest {
+    @Test
+    void approvedDefaultsCoverCoreGameTimingAndRanges() {
+        PluginSettings settings = PluginSettings.from(Map.of());
+
+        assertEquals(50.0, settings.tyrantRangeBlocks());
+        assertEquals(50.0, settings.followerRangeBlocks());
+        assertEquals(Duration.ofDays(7), settings.optOutDuration());
+        assertEquals(Duration.ofHours(48), settings.roleInactivity());
+        assertEquals(Duration.ofHours(24), settings.candidateActivityWindow());
+        assertEquals(Duration.ofHours(24), settings.pendingSelectionTimeout());
+        assertEquals(Duration.ofHours(1), settings.assassinCooldown());
+        assertEquals(Duration.ofMinutes(10), settings.assassinInvisibilityDuration());
+        assertEquals(Duration.ofHours(1), settings.fixerCooldown());
+        assertEquals(Duration.ofMinutes(10), settings.fixerEffectDuration());
+        assertEquals(Duration.ofHours(24), settings.rosterIntelligenceCooldown());
+    }
+
+    @Test
+    void approvedDefaultsCoverAbilitiesItemsMobsAndMessages() {
+        PluginSettings settings = PluginSettings.from(Map.of());
+
+        assertEquals(Duration.ofMinutes(1), settings.selectionRetryInterval());
+        assertEquals(Duration.ofSeconds(60), settings.assassinDoubleJumpCooldown());
+        assertEquals(Duration.ofSeconds(15), settings.assassinSpeedDuration());
+        assertEquals(Duration.ofSeconds(20), settings.assassinWeaknessDuration());
+        assertEquals(3, settings.assassinWeaknessLevel());
+        assertEquals(5, settings.followerStrengthCap());
+        assertEquals(4, settings.followerResistanceCap());
+        assertEquals(2, settings.fixerNormalHeartRows());
+        assertEquals(3, settings.fixerNearTyrantHeartRows());
+        assertEquals(Set.of("ENDER_DRAGON", "WITHER"), settings.deniedMobTypes());
+        assertEquals("STICK", settings.assassinItem().material());
+        assertEquals("Assassin Cloak", settings.assassinItem().name());
+        assertEquals("FISHING_ROD", settings.tamerItem().material());
+        assertEquals("/tyrant item", settings.recoveryCommand());
+        assertEquals("Your inventory is full. Make room and use /tyrant item.",
+            settings.inventoryFullMessage());
+        assertEquals(true, settings.freezeTimersWhilePaused());
+    }
+
+    @Test
+    void rejectsUnsafeRangesAndDurations() {
+        assertThrows(
+            IllegalArgumentException.class,
+            () -> PluginSettings.from(Map.of("tyrant-range-blocks", 0))
+        );
+        assertThrows(
+            IllegalArgumentException.class,
+            () -> PluginSettings.from(Map.of("follower-range-blocks", Double.NaN))
+        );
+        assertThrows(
+            IllegalArgumentException.class,
+            () -> PluginSettings.from(Map.of("role-inactivity-seconds", -1))
+        );
+    }
+}

src/test/java/games/dmg/spigottyrant/PluginSettingsValidatorTest.java

@@ -0,0 +1,32 @@
+package games.dmg.spigottyrant;
+
+import static org.junit.jupiter.api.Assertions.assertSame;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import java.util.Map;
+import org.junit.jupiter.api.Test;
+
+final class PluginSettingsValidatorTest {
+    @Test
+    void acceptsBundledItemMaterialsAndKnownEntityTypes() {
+        PluginSettings settings = PluginSettings.from(Map.of());
+
+        assertSame(settings, PluginSettingsValidator.validate(settings));
+    }
+
+    @Test
+    void rejectsInvalidItemMaterialAndEntityType() {
+        assertThrows(
+            IllegalArgumentException.class,
+            () -> PluginSettingsValidator.validate(PluginSettings.from(Map.of(
+                "assassin-item", Map.of("material", "NOT_REAL", "name", "Cloak")
+            )))
+        );
+        assertThrows(
+            IllegalArgumentException.class,
+            () -> PluginSettingsValidator.validate(PluginSettings.from(Map.of(
+                "denied-mob-types", java.util.List.of("NOT_REAL")
+            )))
+        );
+    }
+}

src/test/java/games/dmg/spigottyrant/TyrantCommandTest.java

@@ -0,0 +1,95 @@
+package games.dmg.spigottyrant;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.Mockito.mock;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import java.time.Clock;
+import java.time.Duration;
+import java.time.Instant;
+import java.time.ZoneOffset;
+import java.util.List;
+import java.util.Optional;
+import java.util.Set;
+import java.util.UUID;
+import org.bukkit.command.Command;
+import org.bukkit.entity.Player;
+import org.junit.jupiter.api.Test;
+import org.mockito.ArgumentCaptor;
+
+final class TyrantCommandTest {
+    @Test
+    void choicesClearlyIdentifyPurchasedAvailableAndUnavailableUnlocks() {
+        UUID tyrantId = UUID.fromString("11111111-1111-1111-1111-111111111111");
+        GameState state = new GameState(
+            GameLifecycle.RUNNING,
+            Optional.of(tyrantId),
+            Optional.empty(),
+            Optional.empty(),
+            Optional.empty(),
+            Optional.empty(),
+            Duration.ZERO,
+            1,
+            1,
+            Set.of(TyrantUnlock.STRENGTH)
+        );
+        TyrantStateManager manager = mock(TyrantStateManager.class);
+        when(manager.game()).thenReturn(state);
+        Player player = mock(Player.class);
+        when(player.getUniqueId()).thenReturn(tyrantId);
+        TyrantCommand command = new TyrantCommand(manager, new TyrantProgressionService());
+
+        command.onCommand(player, mock(Command.class), "tyrant", new String[] {"choices"});
+
+        ArgumentCaptor<String> messages = ArgumentCaptor.forClass(String.class);
+        verify(player, org.mockito.Mockito.atLeastOnce()).sendMessage(messages.capture());
+        List<String> all = messages.getAllValues();
+        assertTrue(all.stream().anyMatch(message -> message.contains("PURCHASED")
+            && message.contains("STRENGTH")));
+        assertTrue(all.stream().anyMatch(message -> message.contains("AVAILABLE")
+            && message.contains("ASSASSIN")));
+    }
+
+    @Test
+    void assigningClassNotifiesTyrantAndNewHolder() {
+        UUID tyrantId = UUID.fromString("11111111-1111-1111-1111-111111111111");
+        UUID targetId = UUID.fromString("22222222-2222-2222-2222-222222222222");
+        GameState game = new GameState(
+            GameLifecycle.RUNNING, Optional.of(tyrantId), Optional.empty(),
+            Optional.empty(), Optional.empty(), Optional.empty(), Duration.ZERO,
+            0, 0, Set.of(TyrantUnlock.FIXER)
+        );
+        PlayerState targetState = PlayerState.newPlayer(targetId, "Target");
+        TyrantStateManager manager = mock(TyrantStateManager.class);
+        when(manager.game()).thenReturn(game);
+        when(manager.player(targetId, "Target")).thenReturn(targetState);
+        when(manager.players()).thenReturn(java.util.Map.of(targetId, targetState));
+        Player tyrant = mock(Player.class);
+        when(tyrant.getUniqueId()).thenReturn(tyrantId);
+        Player target = mock(Player.class);
+        when(target.getUniqueId()).thenReturn(targetId);
+        when(target.getName()).thenReturn("Target");
+        OnlinePlayerDirectory directory = mock(OnlinePlayerDirectory.class);
+        when(directory.findByName("Target")).thenReturn(target);
+        TyrantCommand command = new TyrantCommand(
+            manager,
+            new TyrantProgressionService(),
+            new ClassAssignmentService(),
+            directory,
+            Clock.fixed(Instant.parse("2026-08-14T12:00:00Z"), ZoneOffset.UTC)
+        );
+
+        command.onCommand(
+            tyrant,
+            mock(Command.class),
+            "tyrant",
+            new String[] {"assign", "fixer", "Target"}
+        );
+
+        verify(manager).replacePlayers(any());
+        verify(target).sendMessage(org.mockito.ArgumentMatchers.contains("now the FIXER"));
+        verify(tyrant).sendMessage(org.mockito.ArgumentMatchers.contains("Assigned FIXER"));
+    }
+}

src/test/java/games/dmg/spigottyrant/TyrantProgressionServiceTest.java

@@ -0,0 +1,124 @@
+package games.dmg.spigottyrant;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.time.Duration;
+import java.util.Optional;
+import java.util.Set;
+import java.util.UUID;
+import org.junit.jupiter.api.Test;
+
+final class TyrantProgressionServiceTest {
+    private static final UUID TYRANT = UUID.fromString("11111111-1111-1111-1111-111111111111");
+    private static final UUID VIGILANTE = UUID.fromString("22222222-2222-2222-2222-222222222222");
+    private static final UUID OTHER = UUID.fromString("33333333-3333-3333-3333-333333333333");
+    private final TyrantProgressionService service = new TyrantProgressionService();
+
+    @Test
+    void tyrantPersonallyKillingCurrentVigilanteEarnsOneLevelAndChoice() {
+        GameState before = runningState(0, 1, Set.of());
+
+        GameState after = service.recordVigilanteDeath(before, Optional.of(TYRANT));
+
+        assertEquals(1, after.tyrantLevel());
+        assertEquals(2, after.unspentChoices());
+    }
+
+    @Test
+    void otherEnvironmentalAndPausedDeathsDoNotEarnProgress() {
+        GameState running = runningState(2, 0, Set.of());
+        GameState paused = new GameState(
+            GameLifecycle.PAUSED,
+            running.tyrantId(),
+            running.vigilanteId(),
+            running.pendingTyrant(),
+            running.pendingVigilante(),
+            Optional.of(java.time.Instant.parse("2026-08-14T12:00:00Z")),
+            Duration.ZERO,
+            2,
+            0,
+            Set.of()
+        );
+
+        assertEquals(running, service.recordVigilanteDeath(running, Optional.of(OTHER)));
+        assertEquals(running, service.recordVigilanteDeath(running, Optional.empty()));
+        assertEquals(paused, service.recordVigilanteDeath(paused, Optional.of(TYRANT)));
+    }
+
+    @Test
+    void purchaseConsumesOneChoiceAndCannotBeBoughtTwice() {
+        GameState before = runningState(1, 2, Set.of());
+
+        PurchaseResult first = service.purchase(before, TYRANT, TyrantUnlock.ASSASSIN);
+        PurchaseResult duplicate = service.purchase(
+            first.state(), TYRANT, TyrantUnlock.ASSASSIN
+        );
+
+        assertEquals(PurchaseStatus.PURCHASED, first.status());
+        assertEquals(1, first.state().unspentChoices());
+        assertTrue(first.state().purchases().contains(TyrantUnlock.ASSASSIN));
+        assertEquals(PurchaseStatus.ALREADY_PURCHASED, duplicate.status());
+        assertEquals(first.state(), duplicate.state());
+    }
+
+    @Test
+    void nonTyrantPausedAndNoChoicePurchasesAreRejected() {
+        GameState noChoices = runningState(0, 0, Set.of());
+        GameState paused = new GameState(
+            GameLifecycle.PAUSED,
+            noChoices.tyrantId(),
+            noChoices.vigilanteId(),
+            noChoices.pendingTyrant(),
+            noChoices.pendingVigilante(),
+            Optional.of(java.time.Instant.parse("2026-08-14T12:00:00Z")),
+            Duration.ZERO,
+            0,
+            1,
+            Set.of()
+        );
+
+        assertEquals(PurchaseStatus.NO_CHOICES,
+            service.purchase(noChoices, TYRANT, TyrantUnlock.FIXER).status());
+        assertEquals(PurchaseStatus.NOT_TYRANT,
+            service.purchase(runningState(0, 1, Set.of()), OTHER, TyrantUnlock.FIXER).status());
+        PurchaseResult pausedResult = service.purchase(paused, TYRANT, TyrantUnlock.FIXER);
+        assertEquals(PurchaseStatus.GAME_NOT_RUNNING, pausedResult.status());
+        assertFalse(pausedResult.state().purchases().contains(TyrantUnlock.FIXER));
+    }
+
+    @Test
+    void endingReignClearsLevelChoicesAndPurchases() {
+        GameState progressed = runningState(
+            4,
+            2,
+            Set.of(TyrantUnlock.ASSASSIN, TyrantUnlock.STRENGTH)
+        );
+
+        GameState reset = service.resetReignProgression(progressed);
+
+        assertEquals(0, reset.tyrantLevel());
+        assertEquals(0, reset.unspentChoices());
+        assertEquals(Set.of(), reset.purchases());
+    }
+
+    private static GameState runningState(
+        int level,
+        int choices,
+        Set<TyrantUnlock> purchases
+    ) {
+        return new GameState(
+            GameLifecycle.RUNNING,
+            Optional.of(TYRANT),
+            Optional.of(VIGILANTE),
+            Optional.empty(),
+            Optional.empty(),
+            Optional.empty(),
+            Duration.ZERO,
+            level,
+            choices,
+            purchases
+        );
+    }
+}

src/test/java/games/dmg/spigottyrant/TyrantStateManagerTest.java

@@ -0,0 +1,45 @@
+package games.dmg.spigottyrant;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.nio.file.Path;
+import java.util.UUID;
+import java.util.logging.Logger;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+final class TyrantStateManagerTest {
+    @TempDir
+    Path temporaryDirectory;
+
+    @Test
+    void persistsPlayerNamesAndGameUpdatesWhenDirty() throws Exception {
+        Path stateFile = temporaryDirectory.resolve("state.yml");
+        YamlTyrantStateRepository repository = new YamlTyrantStateRepository(stateFile);
+        TyrantStateManager manager = new TyrantStateManager(
+            repository,
+            Logger.getLogger("test")
+        );
+        UUID playerId = UUID.fromString("11111111-1111-1111-1111-111111111111");
+
+        manager.player(playerId, "FirstName");
+        manager.player(playerId, "LatestName");
+        manager.updateGame(current -> new GameState(
+            GameLifecycle.RUNNING,
+            java.util.Optional.of(playerId),
+            java.util.Optional.empty(),
+            java.util.Optional.empty(),
+            java.util.Optional.empty(),
+            java.util.Optional.empty(),
+            java.time.Duration.ZERO,
+            0,
+            1,
+            java.util.Set.of()
+        ));
+        manager.saveIfDirty();
+
+        PersistentState restored = repository.load();
+        assertEquals("LatestName", restored.players().get(playerId).latestName());
+        assertEquals(GameLifecycle.RUNNING, restored.game().lifecycle());
+    }
+}

src/test/java/games/dmg/spigottyrant/YamlTyrantStateRepositoryTest.java

@@ -0,0 +1,102 @@
+package games.dmg.spigottyrant;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.time.Duration;
+import java.time.Instant;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+import java.util.UUID;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+final class YamlTyrantStateRepositoryTest {
+    @TempDir
+    Path temporaryDirectory;
+
+    @Test
+    void roundTripsLifecycleRolesProgressionPlayersCooldownsItemsAndMobs() throws Exception {
+        UUID tyrant = UUID.fromString("11111111-1111-1111-1111-111111111111");
+        UUID vigilante = UUID.fromString("22222222-2222-2222-2222-222222222222");
+        Instant now = Instant.parse("2026-08-14T12:00:00Z");
+        GameState game = new GameState(
+            GameLifecycle.PAUSED,
+            Optional.of(tyrant),
+            Optional.of(vigilante),
+            Optional.empty(),
+            Optional.of(new PendingSelection(vigilante, now.plusSeconds(3600))),
+            Optional.of(now),
+            Duration.ofMinutes(15),
+            3,
+            2,
+            Set.of(TyrantUnlock.ASSASSIN, TyrantUnlock.STRENGTH)
+        );
+        PlayerState player = new PlayerState(
+            tyrant,
+            "TyrantPlayer",
+            Optional.of(now.minusSeconds(10)),
+            Optional.of(now.plusSeconds(600)),
+            TyrantClass.ASSASSIN,
+            Optional.of(vigilante),
+            Map.of(Ability.ASSASSIN_INVISIBILITY, now.plusSeconds(3600)),
+            Set.of(Ability.ASSASSIN_INVISIBILITY),
+            List.of(new CapturedMob("ZOMBIE", Map.of("custom-name", "Bob")))
+        );
+        PersistentState expected = new PersistentState(game, Map.of(tyrant, player));
+        YamlTyrantStateRepository repository = new YamlTyrantStateRepository(
+            temporaryDirectory.resolve("state.yml")
+        );
+
+        repository.save(expected);
+
+        assertEquals(expected, repository.load());
+    }
+
+    @Test
+    void preservesUnknownFieldsForRetainedState() throws Exception {
+        UUID playerId = UUID.fromString("11111111-1111-1111-1111-111111111111");
+        Path stateFile = temporaryDirectory.resolve("state.yml");
+        Files.writeString(stateFile, """
+            future-root: retained
+            players:
+              11111111-1111-1111-1111-111111111111:
+                name: Player
+                future-player-field: retained-too
+            """);
+        YamlTyrantStateRepository repository = new YamlTyrantStateRepository(stateFile);
+
+        PersistentState loaded = repository.load();
+        repository.save(loaded);
+
+        String saved = Files.readString(stateFile);
+        assertEquals(true, saved.contains("future-root: retained"));
+        assertEquals(true, saved.contains("future-player-field: retained-too"));
+        assertEquals(playerId, loaded.players().get(playerId).playerId());
+    }
+
+    @Test
+    void invalidRecordsCannotRestoreProgressOrCapturedDragons() throws Exception {
+        Path stateFile = temporaryDirectory.resolve("state.yml");
+        Files.writeString(stateFile, """
+            game:
+              lifecycle: RUNNING
+              tyrant-level: -10
+            players:
+              11111111-1111-1111-1111-111111111111:
+                name: Player
+                captured-mobs:
+                  - entity-type: ENDER_DRAGON
+                  - entity-type: NOT_REAL
+            """);
+        YamlTyrantStateRepository repository = new YamlTyrantStateRepository(stateFile);
+
+        PersistentState loaded = repository.load();
+
+        assertEquals(GameState.empty(), loaded.game());
+        assertEquals(List.of(), loaded.players().values().iterator().next().capturedMobs());
+    }
+}