feat(passives): add speed I

feat(passives): add health steal
2026-09-21 00:05:25 -04:00 · 2026-09-20 23:52:33 -04:00
13 changed files with 1081 additions and 10 deletions
@@ -107,6 +107,9 @@ public final class FantasyStickPlugin extends JavaPlugin {
    private games.dmg.fantasystick.passive.QuickerRegenerationI quickerRegeneration;
    private games.dmg.fantasystick.persistence.QuickerRegenerationIISettings quickerRegenerationIISettings;
    private games.dmg.fantasystick.passive.QuickerRegenerationII quickerRegenerationII;
+    private games.dmg.fantasystick.persistence.HealthStealSettings healthStealSettings;
+    private games.dmg.fantasystick.passive.HealthSteal healthSteal;
+    private games.dmg.fantasystick.passive.SpeedI speedI;
    private games.dmg.fantasystick.passive.PassiveRegistry passiveRegistry;
    private games.dmg.fantasystick.passive.PassiveEngine passiveEngine;
    private java.util.concurrent.CompletionStage<Void> configurationDrain = java.util.concurrent.CompletableFuture.completedStage(null);
@@ -145,6 +148,9 @@ public final class FantasyStickPlugin extends JavaPlugin {
            var quickerRegenerationIIInitial = games.dmg.fantasystick.persistence.QuickerRegenerationIISettings.parse(
                getConfig().getString(games.dmg.fantasystick.persistence.QuickerRegenerationIISettings.KEY,
                    games.dmg.fantasystick.persistence.QuickerRegenerationIISettings.DEFAULT));
+            var healthStealInitial = games.dmg.fantasystick.persistence.HealthStealSettings.parse(
+                getConfig().getString(games.dmg.fantasystick.persistence.HealthStealSettings.KEY,
+                    games.dmg.fantasystick.persistence.HealthStealSettings.DEFAULT));
            var sheetPackDefaults = games.dmg.fantasystick.persistence.SheetResourcePackSettings.packagedDefaults();
            sheetResourcePackSettings = new games.dmg.fantasystick.persistence.SheetResourcePackSettings(getDataFolder().toPath(),
                getConfig().get(games.dmg.fantasystick.persistence.SheetResourcePackSettings.URL_KEY),
@@ -354,9 +360,17 @@ public final class FantasyStickPlugin extends JavaPlugin {
            quickerRegenerationIISettings = new games.dmg.fantasystick.persistence.QuickerRegenerationIISettings(
                getDataFolder().toPath(), quickerRegenerationIIInitial.bonus().toString());
            quickerRegenerationII = new games.dmg.fantasystick.passive.QuickerRegenerationII(quickerRegenerationIIInitial);
+            healthStealSettings = new games.dmg.fantasystick.persistence.HealthStealSettings(
+                getDataFolder().toPath(), healthStealInitial.healing().toString());
+            healthSteal = new games.dmg.fantasystick.passive.HealthSteal(healthStealInitial, characters, sessions, nextTick,
+                event -> getServer().getPluginManager().callEvent(event), games.dmg.fantasystick.session.NativeHealthLimit::read,
+                problem -> getLogger().log(Level.WARNING, "Health Steal failed for character " + problem.character(), problem.cause()));
+            speedI = new games.dmg.fantasystick.passive.SpeedI(sessions);
            passiveRegistry = new games.dmg.fantasystick.passive.PassiveRegistry();
            passiveRegistry.register(quickerRegeneration.definition());
            passiveRegistry.register(quickerRegenerationII.definition());
+            passiveRegistry.register(healthSteal.definition());
+            passiveRegistry.register(speedI.definition());
            passiveEngine = new games.dmg.fantasystick.passive.PassiveEngine(passiveRegistry, characters, sessions, nextTick,
                problem -> getLogger().log(Level.WARNING, "Passive change failed for character " + problem.character()
                    + "; passive " + problem.passive(), problem.cause()));
@@ -425,6 +439,7 @@ public final class FantasyStickPlugin extends JavaPlugin {
            admin.attachOutOfCombatRecovery(outOfCombatRecoverySettings, outOfCombatRecovery);
            admin.attachQuickerRegeneration(quickerRegenerationSettings, quickerRegeneration, passiveRegistry);
            admin.attachQuickerRegenerationII(quickerRegenerationIISettings, quickerRegenerationII, passiveRegistry);
+            admin.attachHealthSteal(healthStealSettings, healthSteal, passiveRegistry);
            admin.attachCharacterIssuer(new games.dmg.fantasystick.session.AdminCharacterIssuer(characters,
                () -> factory.create(rules), nextTick, problem -> getLogger().log(Level.WARNING,
                    "Admin character issue " + problem.operation() + " for player " + problem.player()
@@ -440,6 +455,7 @@ public final class FantasyStickPlugin extends JavaPlugin {
            getServer().getPluginManager().registerEvents(partyEvents, this);
            getServer().getPluginManager().registerEvents(partyCombat, this);
            partyCombat.install(this);
+            getServer().getPluginManager().registerEvents(healthSteal, this);
            getServer().getPluginManager().registerEvents(combatExperience, this);
            combatExperience.install(this);
            getServer().getPluginManager().registerEvents(fireball, this);
@@ -465,6 +481,7 @@ public final class FantasyStickPlugin extends JavaPlugin {
            getServer().getPluginManager().registerEvents(nutritionPolicy, this);
            getServer().getPluginManager().registerEvents(outOfCombatRecovery, this);
            outOfCombatRecovery.install(this);
+            speedI.install(this);
            getServer().getPluginManager().registerEvents(books, this);
            getServer().getPluginManager().registerEvents(gameModes, this);
            getServer().getPluginManager().registerEvents(sheetResourcePack, this);
@@ -567,6 +584,9 @@ public final class FantasyStickPlugin extends JavaPlugin {
        var closingOutOfCombatRecoverySettings = outOfCombatRecoverySettings; outOfCombatRecoverySettings = null;
        var closingQuickerRegenerationSettings = quickerRegenerationSettings; quickerRegenerationSettings = null;
        var closingQuickerRegenerationIISettings = quickerRegenerationIISettings; quickerRegenerationIISettings = null;
+        var closingHealthStealSettings = healthStealSettings; healthStealSettings = null;
+        var closingHealthSteal = healthSteal; healthSteal = null;
+        var closingSpeedI = speedI; speedI = null;
        var closingPassiveEngine = passiveEngine; passiveEngine = null;
        quickerRegeneration = null; quickerRegenerationII = null; passiveRegistry = null;
        // Retire client resources independently of successful ordinary-equipment restoration.
@@ -608,6 +628,7 @@ public final class FantasyStickPlugin extends JavaPlugin {
        if (closingOutOfCombatRecoverySettings != null) cleanup("out-of-combat recovery configuration", closingOutOfCombatRecoverySettings::close);
        if (closingQuickerRegenerationSettings != null) cleanup("Quicker Regeneration I configuration", closingQuickerRegenerationSettings::close);
        if (closingQuickerRegenerationIISettings != null) cleanup("Quicker Regeneration II configuration", closingQuickerRegenerationIISettings::close);
+        if (closingHealthStealSettings != null) cleanup("Health Steal configuration", closingHealthStealSettings::close);
        configurationDrain = java.util.concurrent.CompletableFuture.allOf(
            closingSettings == null ? java.util.concurrent.CompletableFuture.completedFuture(null)
                : closingSettings.drained().toCompletableFuture(),
@@ -660,7 +681,9 @@ public final class FantasyStickPlugin extends JavaPlugin {
            closingQuickerRegenerationSettings == null ? java.util.concurrent.CompletableFuture.completedFuture(null)
                : closingQuickerRegenerationSettings.drained().toCompletableFuture(),
            closingQuickerRegenerationIISettings == null ? java.util.concurrent.CompletableFuture.completedFuture(null)
-                : closingQuickerRegenerationIISettings.drained().toCompletableFuture());
+                : closingQuickerRegenerationIISettings.drained().toCompletableFuture(),
+            closingHealthStealSettings == null ? java.util.concurrent.CompletableFuture.completedFuture(null)
+                : closingHealthStealSettings.drained().toCompletableFuture());
        if (closingBooks != null) cleanup("character book", closingBooks::close);
        if (closingAdminRevival != null) cleanup("admin revival", closingAdminRevival::close);
        if (closingBasicAttack != null) cleanup("basic attack", closingBasicAttack::close);
@@ -682,6 +705,8 @@ public final class FantasyStickPlugin extends JavaPlugin {
        if (closingNutrition != null) cleanup("nutrition policy", closingNutrition::close);
        if (closingOutOfCombatRecovery != null) cleanup("out-of-combat recovery", closingOutOfCombatRecovery::close);
        if (closingPassiveEngine != null) cleanup("passive engine", closingPassiveEngine::close);
+        if (closingHealthSteal != null) cleanup("Health Steal", closingHealthSteal::close);
+        if (closingSpeedI != null) cleanup("Speed I", closingSpeedI::close);
        if (closingVisuals != null) cleanup("session particles", closingVisuals::close);
        if (closingParties != null) cleanup("parties", closingParties::close);
        if (closingPartyCombat != null) cleanup("party combat", closingPartyCombat::close);
@@ -694,6 +719,7 @@ public final class FantasyStickPlugin extends JavaPlugin {
        unregister(closingPartyEvents);
        unregister(closingPartyCombat);
        unregister(closingCombatExperience);
+        unregister(closingHealthSteal);
        unregister(closingFireball);
        unregister(closingFrostShard);
        unregister(closingLongbow);
@@ -0,0 +1,206 @@
+package games.dmg.fantasystick.passive;
+
+import games.dmg.fantasystick.party.CombatSources;
+import games.dmg.fantasystick.persistence.CharacterRecord;
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import games.dmg.fantasystick.progression.Stat;
+import games.dmg.fantasystick.session.EquipmentSessions;
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.util.ArrayDeque;
+import java.util.Collections;
+import java.util.IdentityHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.UUID;
+import java.util.function.Consumer;
+import java.util.function.Supplier;
+import org.bukkit.attribute.Attribute;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.entity.EntityDamageEvent;
+import org.bukkit.event.entity.EntityDeathEvent;
+import org.bukkit.event.entity.EntityRegainHealthEvent;
+import org.bukkit.event.entity.EntityRemoveEvent;
+import org.bukkit.event.entity.PlayerDeathEvent;
+
+/** Consume-once final-blow attribution and persisted native healing for Health Steal. */
+public final class HealthSteal implements Listener, AutoCloseable {
+    public static final String ID = "health_steal";
+    private static final int MAX_PENDING_PER_CHARACTER = 64;
+    private static final int MAX_CONSUMED_EVENTS = 1_024;
+    public record Settings(BigInteger healing) {
+        public Settings {
+            Objects.requireNonNull(healing);
+            if (healing.signum() < 0 || healing.compareTo(BigInteger.valueOf(1_024)) > 0) {
+                throw new IllegalArgumentException("Invalid Health Steal healing");
+            }
+        }
+        public static Settings defaults() { return new Settings(BigInteger.ONE); }
+    }
+    public record Failure(UUID character, Throwable cause) { }
+    private record Candidate(LivingEntity target, CombatSources.Origin origin) { }
+    private record Heal(EquipmentSessions.Active active, double amount) { }
+
+    private final CharacterStorage characters;
+    private final EquipmentSessions sessions;
+    private final Consumer<Runnable> nextTick;
+    private final Consumer<EntityRegainHealthEvent> healingEvents;
+    private final Supplier<BigDecimal> nativeLimit;
+    private final Consumer<Failure> failures;
+    private final CombatSources sources;
+    private final Map<UUID, Candidate> lethal = new java.util.HashMap<>();
+    private final Set<PlayerDeathEvent> fantasyDefeats = Collections.newSetFromMap(new IdentityHashMap<>());
+    private final Set<EntityDeathEvent> consumed = Collections.newSetFromMap(new IdentityHashMap<>());
+    private final ArrayDeque<EntityDeathEvent> consumedOrder = new ArrayDeque<>();
+    private final Map<UUID, ArrayDeque<Heal>> pending = new java.util.HashMap<>();
+    private volatile Settings settings;
+    private boolean closed;
+
+    public HealthSteal(Settings settings, CharacterStorage characters, EquipmentSessions sessions,
+                       Consumer<Runnable> nextTick, Consumer<EntityRegainHealthEvent> healingEvents,
+                       Supplier<BigDecimal> nativeLimit, Consumer<Failure> failures) {
+        this.settings = Objects.requireNonNull(settings); this.characters = Objects.requireNonNull(characters);
+        this.sessions = Objects.requireNonNull(sessions); this.nextTick = Objects.requireNonNull(nextTick);
+        this.healingEvents = Objects.requireNonNull(healingEvents); this.nativeLimit = Objects.requireNonNull(nativeLimit);
+        this.failures = Objects.requireNonNull(failures); sources = new CombatSources(sessions);
+    }
+
+    public void configure(Settings value) { settings = Objects.requireNonNull(value); }
+    public BigInteger healing() { return settings.healing(); }
+    public PassiveDefinition definition() {
+        return new PassiveDefinition(ID, "Health Steal",
+            Map.of(Stat.STR, BigInteger.valueOf(14), Stat.CON, BigInteger.valueOf(12)), Set.of(), BigInteger.ONE,
+            List.of("Immediately restore " + healing() + " health point" + (healing().equals(BigInteger.ONE) ? "" : "s")
+                + " when this active character's accepted damage lands a qualifying final blow.",
+                "Passive mobs qualify; assists, ordinary players and repeated defeat callbacks do not."));
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void damage(EntityDamageEvent event) {
+        if (closed || !(event.getEntity() instanceof LivingEntity target)) return;
+        UUID targetId = target.getUniqueId();
+        if (event.isCancelled() || event.getFinalDamage() <= 0) { lethal.remove(targetId); return; }
+        var origin = sources.source(event);
+        double remaining = target.getHealth() + target.getAbsorptionAmount();
+        if (origin == null || origin.session() == null || !sources.current(origin)
+                || targetId.equals(origin.player()) || !Double.isFinite(remaining)
+                || event.getFinalDamage() < remaining) {
+            lethal.remove(targetId); return;
+        }
+        lethal.put(targetId, new Candidate(target, origin));
+    }
+
+    @EventHandler(priority = EventPriority.LOWEST, ignoreCancelled = true)
+    public void beforePlayerDeath(PlayerDeathEvent event) {
+        if (!closed && sessions.active(event.getEntity().getUniqueId()).isPresent()) fantasyDefeats.add(event);
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void playerDeath(PlayerDeathEvent event) {
+        boolean fantasy = fantasyDefeats.remove(event);
+        if (!closed && fantasy && event.isCancelled()) defeat(event, event.getEntity());
+        else lethal.remove(event.getEntity().getUniqueId());
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void mobDeath(EntityDeathEvent event) {
+        if (!closed && !(event instanceof PlayerDeathEvent)) defeat(event, event.getEntity());
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void removed(EntityRemoveEvent event) {
+        if (event.getCause() != EntityRemoveEvent.Cause.DEATH) lethal.remove(event.getEntity().getUniqueId());
+    }
+
+    private void defeat(EntityDeathEvent event, LivingEntity target) {
+        if (!consumed.add(event)) return;
+        consumedOrder.addLast(event);
+        while (consumedOrder.size() > MAX_CONSUMED_EVENTS) consumed.remove(consumedOrder.removeFirst());
+        var candidate = lethal.remove(target.getUniqueId());
+        if (candidate == null || candidate.target() != target || !sources.current(candidate.origin())) return;
+        var origin = candidate.origin();
+        var active = sessions.active(origin.player()).orElse(null);
+        if (active == null || !active.session().equals(origin.session()) || !active.character().equals(origin.character())
+                || !sessions.current(active)) return;
+        var record = sessions.currentRecord(active).orElse(null);
+        var player = sessions.currentPlayer(active).orElse(null);
+        if (record == null || player == null || record.dead() || !record.passives().contains(ID)) return;
+        BigInteger configured = settings.healing();
+        if (configured.signum() == 0) return;
+        var maximumAttribute = player.getAttribute(Attribute.MAX_HEALTH);
+        if (maximumAttribute == null) return;
+        double current = player.getHealth();
+        double maximum = Math.min(maximumAttribute.getValue(), record.maximumHealth().doubleValue());
+        double reserved = pending.getOrDefault(active.character(), new ArrayDeque<>()).stream()
+            .mapToDouble(Heal::amount).sum();
+        double amount = configured.bitLength() > 1023 ? maximum - current - reserved : configured.doubleValue();
+        double proposed = Math.min(maximum - current - reserved, amount);
+        if (!Double.isFinite(current) || !Double.isFinite(maximum) || current < 0 || maximum <= 0
+                || !Double.isFinite(proposed) || proposed <= 0) return;
+        var healing = new EntityRegainHealthEvent(player, proposed, EntityRegainHealthEvent.RegainReason.CUSTOM);
+        healingEvents.accept(healing);
+        double accepted = Math.min(proposed, Math.min(maximum - current - reserved, healing.getAmount()));
+        if (healing.isCancelled() || !Double.isFinite(accepted) || accepted <= 0) return;
+        var queue = pending.computeIfAbsent(active.character(), ignored -> new ArrayDeque<>());
+        if (queue.size() >= MAX_PENDING_PER_CHARACTER) return;
+        queue.addLast(new Heal(active, accepted));
+        if (queue.size() == 1) attempt(active.character());
+    }
+
+    private void attempt(UUID character) {
+        var queue = pending.get(character); var operation = queue == null ? null : queue.peekFirst();
+        if (closed || operation == null) return;
+        if (!sessions.current(operation.active())) { finish(character); return; }
+        var record = sessions.currentRecord(operation.active()).orElse(null);
+        var player = sessions.currentPlayer(operation.active()).orElse(null);
+        if (record == null || player == null || record.dead() || !record.passives().contains(ID)) { finish(character); return; }
+        double nativeBefore = player.getHealth();
+        BigDecimal target = record.health().add(BigDecimal.valueOf(operation.amount()));
+        BigDecimal limit;
+        try { limit = nativeLimit.get(); }
+        catch (RuntimeException failure) { report(character, failure); finish(character); return; }
+        BigInteger expected = record.revision();
+        characters.saveHealth(character, expected, target, limit).whenComplete((saved, failure) -> {
+            try { nextTick.accept(() -> complete(character, operation, expected, nativeBefore, saved, failure)); }
+            catch (RuntimeException rejected) { report(character, rejected); }
+        });
+    }
+
+    private void complete(UUID character, Heal operation, BigInteger expected, double nativeBefore,
+                          java.util.Optional<CharacterRecord> saved, Throwable failure) {
+        try {
+            if (closed || failure != null || saved == null || saved.isEmpty()) {
+                if (failure != null) report(character, failure); return;
+            }
+            var record = saved.orElseThrow();
+            if (!sessions.current(operation.active())
+                    || !sessions.acknowledgeProgress(operation.active(), expected, record)) return;
+            var player = sessions.currentPlayer(operation.active()).orElse(null);
+            if (player == null || Double.compare(player.getHealth(), nativeBefore) != 0) return;
+            var attribute = player.getAttribute(Attribute.MAX_HEALTH);
+            if (attribute == null) return;
+            double maximum = Math.min(attribute.getValue(), record.maximumHealth().doubleValue());
+            double publish = Math.min(maximum, record.health().doubleValue());
+            if (Double.isFinite(maximum) && Double.isFinite(publish) && publish > nativeBefore) player.setHealth(publish);
+        } finally { finish(character); }
+    }
+
+    private void finish(UUID character) {
+        var queue = pending.get(character);
+        if (queue == null) return;
+        queue.pollFirst();
+        if (queue.isEmpty()) pending.remove(character); else attempt(character);
+    }
+    private void report(UUID character, Throwable failure) {
+        try { failures.accept(new Failure(character, failure)); } catch (RuntimeException ignored) { }
+    }
+    @Override public void close() {
+        closed = true; lethal.clear(); fantasyDefeats.clear(); consumed.clear(); consumedOrder.clear(); pending.clear();
+    }
+}
@@ -0,0 +1,149 @@
+package games.dmg.fantasystick.passive;
+
+import games.dmg.fantasystick.progression.Stat;
+import games.dmg.fantasystick.session.EquipmentSessions;
+import java.math.BigInteger;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.UUID;
+import org.bukkit.entity.Player;
+import org.bukkit.potion.PotionEffect;
+import org.bukkit.potion.PotionEffectType;
+
+/** Current-session Speed I layer for the learned character passive. */
+public final class SpeedI implements AutoCloseable {
+    public static final String ID = "speed_i";
+    private static final int MAX_ACTIVE_CHECKS = 256;
+    private static final int AMPLIFIER = 0;
+
+    private final class State {
+        final EquipmentSessions.Active active;
+        final Player player;
+        PotionEffect owned;
+        PotionEffect displaced;
+        long displacedUntil;
+        long refreshedAt;
+        State(EquipmentSessions.Active active, Player player) { this.active = active; this.player = player; }
+
+        void refresh() {
+            refreshedAt = sweepGeneration;
+            if (displaced != null && !displaced.isInfinite() && sweepGeneration >= displacedUntil) displaced = null;
+            PotionEffect current;
+            try { current = player.getPotionEffect(PotionEffectType.SPEED); }
+            catch (RuntimeException unavailable) { return; }
+            if (owned != null && !same(current, owned)) { owned = null; displaced = null; }
+            if (!eligible()) { remove(); return; }
+            if (current != null && current.getAmplifier() >= AMPLIFIER) return;
+            var effect = new PotionEffect(PotionEffectType.SPEED, PotionEffect.INFINITE_DURATION,
+                AMPLIFIER, false, false, true);
+            try {
+                if (player.addPotionEffect(effect, true)) {
+                    owned = effect; displaced = current;
+                    displacedUntil = current == null ? 0 : current.isInfinite()
+                        ? Long.MAX_VALUE : sweepGeneration + current.getDuration();
+                }
+            } catch (RuntimeException unavailable) { owned = null; displaced = null; }
+        }
+
+        boolean eligible() {
+            if (closed || !sessions.current(active)) return false;
+            var record = sessions.currentRecord(active).orElse(null);
+            return record != null && !record.dead() && record.passives().contains(ID);
+        }
+
+        void remove() {
+            if (owned != null) {
+                PotionEffect current;
+                try { current = player.getPotionEffect(PotionEffectType.SPEED); }
+                catch (RuntimeException unavailable) { return; }
+                if (same(current, owned)) {
+                    try {
+                        player.removePotionEffect(PotionEffectType.SPEED);
+                        if (displaced != null && (displaced.isInfinite() || sweepGeneration < displacedUntil)) {
+                            int duration = displaced.isInfinite() ? PotionEffect.INFINITE_DURATION
+                                : Math.toIntExact(Math.min(Integer.MAX_VALUE, displacedUntil - sweepGeneration));
+                            player.addPotionEffect(new PotionEffect(displaced.getType(), duration, displaced.getAmplifier(),
+                                displaced.isAmbient(), displaced.hasParticles(), displaced.hasIcon()), true);
+                        }
+                    } catch (RuntimeException unavailable) { return; }
+                }
+                owned = null; displaced = null;
+            }
+            states.remove(active.player(), this);
+        }
+    }
+
+    private final EquipmentSessions sessions;
+    private final Map<UUID, State> states = new java.util.HashMap<>();
+    private int activeCursor;
+    private int stateCursor;
+    private long sweepGeneration;
+    private org.bukkit.scheduler.BukkitTask sweepTask;
+    private boolean closed;
+
+    public SpeedI(EquipmentSessions sessions) { this.sessions = Objects.requireNonNull(sessions); }
+
+    public PassiveDefinition definition() {
+        return new PassiveDefinition(ID, "Speed I", Map.of(Stat.DEX, BigInteger.valueOf(14)), Set.of(), BigInteger.ONE,
+            List.of("Continuously provides the standard native Speed I effect while this character is active.",
+                "Does not stack with equal Speed I and preserves stronger unrelated Speed effects."));
+    }
+
+    public void install(org.bukkit.plugin.Plugin plugin) {
+        Objects.requireNonNull(plugin);
+        if (closed || sweepTask != null) throw new IllegalStateException("Speed I sweep already installed or closed");
+        sweepTask = plugin.getServer().getScheduler().runTaskTimer(plugin, this::sweep, 1, 1);
+    }
+
+    /** Bounded rotating reconciliation for active sessions and previously owned layers. */
+    public void sweep() {
+        if (closed) return;
+        sweepGeneration++;
+        var active = sessions.activeCharacters();
+        int activeChecks = Math.min(MAX_ACTIVE_CHECKS, active.size());
+        for (int index = 0; index < activeChecks; index++) {
+            var snapshot = active.get((activeCursor + index) % active.size());
+            reconcile(snapshot);
+        }
+        activeCursor = active.isEmpty() ? 0 : (activeCursor + activeChecks) % active.size();
+
+        var known = List.copyOf(states.values());
+        int stateChecks = Math.min(MAX_ACTIVE_CHECKS, known.size());
+        for (int index = 0; index < stateChecks; index++) {
+            var state = known.get((stateCursor + index) % known.size());
+            if (state.refreshedAt != sweepGeneration) state.refresh();
+        }
+        stateCursor = known.isEmpty() ? 0 : (stateCursor + stateChecks) % known.size();
+    }
+
+    private void reconcile(EquipmentSessions.ActiveCharacter snapshot) {
+        var active = snapshot.session();
+        var state = states.get(active.player());
+        boolean learned = !snapshot.record().dead() && snapshot.record().passives().contains(ID);
+        if (!learned || !sessions.current(active)) { if (state != null) state.refresh(); return; }
+        if (state != null && !state.active.equals(active)) { state.remove(); state = states.get(active.player()); }
+        if (state == null) {
+            var player = sessions.currentPlayer(active).orElse(null);
+            if (player == null) return;
+            state = new State(active, player); states.put(active.player(), state);
+        }
+        state.refresh();
+    }
+
+    private static boolean same(PotionEffect first, PotionEffect second) {
+        return first != null && second != null && first.getType().equals(second.getType())
+            && first.getAmplifier() == second.getAmplifier() && first.isInfinite() && second.isInfinite()
+            && first.isAmbient() == second.isAmbient() && first.hasParticles() == second.hasParticles()
+            && first.hasIcon() == second.hasIcon();
+    }
+
+    @Override public void close() {
+        if (closed) return;
+        closed = true;
+        if (sweepTask != null) sweepTask.cancel();
+        for (var state : List.copyOf(states.values())) state.remove();
+        states.clear();
+    }
+}
@@ -0,0 +1,113 @@
+package games.dmg.fantasystick.persistence;
+
+import games.dmg.fantasystick.passive.HealthSteal;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.channels.FileChannel;
+import java.nio.channels.OverlappingFileLockException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.LinkOption;
+import java.nio.file.Path;
+import java.nio.file.StandardCopyOption;
+import java.nio.file.StandardOpenOption;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.Objects;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.CompletionStage;
+import java.util.concurrent.Executors;
+import java.util.concurrent.RejectedExecutionException;
+import org.yaml.snakeyaml.LoaderOptions;
+import org.yaml.snakeyaml.Yaml;
+import org.yaml.snakeyaml.constructor.SafeConstructor;
+
+/** Durable save-before-publication Health Steal balance. */
+public final class HealthStealSettings implements AutoCloseable {
+    public static final String KEY = "health-steal-healing-per-kill";
+    public static final String DEFAULT = "1";
+    private static final int MAX_BYTES = 1_048_576;
+    @FunctionalInterface interface Replacement { void move(Path from, Path to) throws IOException; }
+    public record Update(String value, HealthSteal.Settings settings, long sequence) { }
+    private final Path directory; private final Replacement replacement;
+    private final java.util.concurrent.ExecutorService worker = Executors.newSingleThreadExecutor(
+        task -> new Thread(task, "fantasy-health-steal-configuration"));
+    private volatile String effective; private String persisted; private long persistedSequence, publishedSequence;
+    private boolean closed; private int pending; private final CompletableFuture<Void> drained = new CompletableFuture<>();
+
+    public HealthStealSettings(Path directory, String initial) {
+        this(directory, initial, (from, to) -> Files.move(from, to,
+            StandardCopyOption.ATOMIC_MOVE, StandardCopyOption.REPLACE_EXISTING));
+    }
+    HealthStealSettings(Path directory, String initial, Replacement replacement) {
+        this.directory = Objects.requireNonNull(directory).toAbsolutePath(); this.replacement = Objects.requireNonNull(replacement);
+        effective = canonical(initial); persisted = effective;
+    }
+    public static HealthSteal.Settings parse(String raw) {
+        try { return new HealthSteal.Settings(new java.math.BigInteger(raw)); }
+        catch (NumberFormatException invalid) { throw new IllegalArgumentException("Bonus must be a whole number", invalid); }
+    }
+    private static String canonical(String raw) { var parsed = parse(raw); return parsed.healing().toString(); }
+    public String value() { return effective; }
+    public HealthSteal.Settings settings() { return parse(effective); }
+    public CompletionStage<Update> set(String raw) {
+        String accepted = canonical(raw);
+        synchronized (this) {
+            if (closed) return CompletableFuture.failedStage(new IOException("Configuration store is closed")); pending++;
+        }
+        try {
+            return CompletableFuture.supplyAsync(() -> {
+                try { save(accepted); persisted = accepted; return new Update(accepted, parse(accepted), ++persistedSequence); }
+                catch (IOException | RuntimeException failure) {
+                    throw new java.util.concurrent.CompletionException(failure instanceof IllegalArgumentException
+                        ? failure : new IOException("Health Steal configuration save failed; effective value unchanged", failure));
+                } finally { finished(); }
+            }, worker).minimalCompletionStage();
+        } catch (RejectedExecutionException rejected) {
+            finished(); return CompletableFuture.failedStage(new IOException("Configuration store is closed", rejected));
+        }
+    }
+    public synchronized boolean publish(Update update) {
+        if (update.sequence() <= publishedSequence) return false;
+        effective = canonical(update.value()); publishedSequence = update.sequence(); return true;
+    }
+    private void save(String value) throws IOException {
+        Files.createDirectories(directory);
+        if (!Files.isDirectory(directory, LinkOption.NOFOLLOW_LINKS)) throw new IOException("Unsafe directory");
+        var file = directory.resolve("config.yml"); var lockFile = directory.resolve(".config.lock");
+        if (Files.exists(lockFile, LinkOption.NOFOLLOW_LINKS) && !Files.isRegularFile(lockFile, LinkOption.NOFOLLOW_LINKS)) {
+            throw new IOException("Unsafe lock");
+        }
+        try (var channel = FileChannel.open(lockFile, StandardOpenOption.CREATE, StandardOpenOption.WRITE,
+                LinkOption.NOFOLLOW_LINKS); var lock = channel.tryLock()) {
+            if (lock == null) throw new IOException("Configuration busy");
+            var options = new LoaderOptions(); options.setAllowDuplicateKeys(false); options.setMaxAliasesForCollections(20);
+            options.setCodePointLimit(MAX_BYTES); var yaml = new Yaml(new SafeConstructor(options));
+            Map<String, Object> document = new LinkedHashMap<>();
+            if (Files.exists(file, LinkOption.NOFOLLOW_LINKS)) {
+                if (!Files.isRegularFile(file, LinkOption.NOFOLLOW_LINKS)) throw new IOException("Unsafe configuration");
+                byte[] bytes; try (var input = Files.newInputStream(file, LinkOption.NOFOLLOW_LINKS)) { bytes = input.readNBytes(MAX_BYTES + 1); }
+                if (bytes.length > MAX_BYTES) throw new IOException("Configuration too large");
+                Object loaded = yaml.load(StandardCharsets.UTF_8.newDecoder().decode(ByteBuffer.wrap(bytes)).toString());
+                if (loaded != null) {
+                    if (!(loaded instanceof Map<?, ?> map)) throw new IOException("Invalid configuration root");
+                    for (var entry : map.entrySet()) {
+                        if (!(entry.getKey() instanceof String key)) throw new IOException("Invalid configuration key");
+                        document.put(key, entry.getValue());
+                    }
+                }
+            }
+            document.put(KEY, value); byte[] bytes = yaml.dump(document).getBytes(StandardCharsets.UTF_8);
+            Path temporary = Files.createTempFile(directory, ".config-", ".tmp");
+            try {
+                try (var output = FileChannel.open(temporary, StandardOpenOption.WRITE, LinkOption.NOFOLLOW_LINKS)) {
+                    var buffer = ByteBuffer.wrap(bytes); while (buffer.hasRemaining()) output.write(buffer); output.force(true);
+                }
+                replacement.move(temporary, file);
+            } finally { Files.deleteIfExists(temporary); }
+        } catch (OverlappingFileLockException busy) { throw new IOException("Configuration busy", busy); }
+    }
+    private synchronized void finished() { pending--; if (closed && pending == 0) drained.complete(null); }
+    public CompletionStage<Void> drained() { return drained.minimalCompletionStage(); }
+    @Override public synchronized void close() { closed = true; worker.shutdown(); if (pending == 0) drained.complete(null); }
+}
@@ -72,6 +72,8 @@ public final class EquipmentAdminCommand implements TabExecutor, AutoCloseable {
    private games.dmg.fantasystick.passive.QuickerRegenerationI quickerRegeneration;
    private games.dmg.fantasystick.persistence.QuickerRegenerationIISettings quickerRegenerationIISettings;
    private games.dmg.fantasystick.passive.QuickerRegenerationII quickerRegenerationII;
+    private games.dmg.fantasystick.persistence.HealthStealSettings healthStealSettings;
+    private games.dmg.fantasystick.passive.HealthSteal healthSteal;
    private games.dmg.fantasystick.passive.PassiveRegistry passiveRegistry;

    public EquipmentAdminCommand(EquipmentSessionStore receipts, EquipmentSessions sessions, Server server,
@@ -323,6 +325,14 @@ public final class EquipmentAdminCommand implements TabExecutor, AutoCloseable {
        if (passiveRegistry != Objects.requireNonNull(registry)) throw new IllegalArgumentException("Passive registry mismatch");
    }

+    public void attachHealthSteal(games.dmg.fantasystick.persistence.HealthStealSettings settings,
+                                  games.dmg.fantasystick.passive.HealthSteal passive,
+                                  games.dmg.fantasystick.passive.PassiveRegistry registry) {
+        if (closed || healthStealSettings != null) throw new IllegalStateException("Health Steal already attached or command closed");
+        healthStealSettings = Objects.requireNonNull(settings); healthSteal = Objects.requireNonNull(passive);
+        if (passiveRegistry != Objects.requireNonNull(registry)) throw new IllegalArgumentException("Passive registry mismatch");
+    }
+
    public void attachExperienceGrant(AdminExperienceGrant grant) {
        if (closed || experienceGrant != null) throw new IllegalStateException("Experience grant already attached or command closed");
        experienceGrant = Objects.requireNonNull(grant);
@@ -512,6 +522,9 @@ public final class EquipmentAdminCommand implements TabExecutor, AutoCloseable {
                && quickerRegenerationIISettings != null) {
            quickerRegenerationIIConfiguration(sender, args); return;
        }
+        if (args[1].equals(games.dmg.fantasystick.persistence.HealthStealSettings.KEY) && healthStealSettings != null) {
+            healthStealConfiguration(sender, args); return;
+        }
        if (longbowSettings != null && games.dmg.fantasystick.persistence.LongbowSettings.keys().contains(args[1])) {
            longbowConfiguration(sender, args); return;
        }
@@ -685,6 +698,35 @@ public final class EquipmentAdminCommand implements TabExecutor, AutoCloseable {
        });
    }

+    private void healthStealConfiguration(CommandSender sender, String[] args) {
+        if (args.length == 2) {
+            sender.sendMessage(games.dmg.fantasystick.persistence.HealthStealSettings.KEY + "="
+                + healthStealSettings.value() + " (applies to later qualifying final blows only)"); return;
+        }
+        java.util.concurrent.CompletionStage<games.dmg.fantasystick.persistence.HealthStealSettings.Update> operation;
+        try { operation = healthStealSettings.set(args[2]); }
+        catch (IllegalArgumentException invalid) {
+            sender.sendMessage("Health Steal setting is invalid; the effective value is unchanged."); return;
+        }
+        operation.whenComplete((saved, failure) -> {
+            if (failure != null) report(null, "config-health-steal", failure); if (closed) return;
+            try { nextTick.accept(() -> {
+                if (closed) return; boolean applied = false;
+                if (failure == null) {
+                    applied = healthStealSettings.publish(saved);
+                    if (applied) { healthSteal.configure(saved.settings()); passiveRegistry.replace(healthSteal.definition()); }
+                }
+                if (!sender.hasPermission(PERMISSION)
+                        || sender instanceof org.bukkit.entity.Player player && !player.isOnline()) return;
+                if (failure != null) sender.sendMessage("Health Steal configuration save failed; effective value is unchanged.");
+                else if (!applied) sender.sendMessage("Saved request was superseded; effective "
+                    + games.dmg.fantasystick.persistence.HealthStealSettings.KEY + "=" + healthStealSettings.value() + ".");
+                else sender.sendMessage("Saved " + games.dmg.fantasystick.persistence.HealthStealSettings.KEY
+                    + "=" + saved.value() + " for later qualifying final blows.");
+            }); } catch (RuntimeException rejected) { report(null, "config-response", rejected); }
+        });
+    }
+
    private void longbowConfiguration(CommandSender sender, String[] args) {
        String key = args[1];
        if (args.length == 2) {
@@ -1115,6 +1157,7 @@ public final class EquipmentAdminCommand implements TabExecutor, AutoCloseable {
            keys.addAll(games.dmg.fantasystick.persistence.OutOfCombatRecoverySettings.keys());
            keys.add(games.dmg.fantasystick.persistence.QuickerRegenerationSettings.KEY);
            keys.add(games.dmg.fantasystick.persistence.QuickerRegenerationIISettings.KEY);
+            keys.add(games.dmg.fantasystick.persistence.HealthStealSettings.KEY);
            keys.addAll(games.dmg.fantasystick.persistence.FrostShardSettings.keys());
            keys.addAll(games.dmg.fantasystick.persistence.LongbowSettings.keys());
            keys.addAll(games.dmg.fantasystick.persistence.QuickstepSettings.keys());
@@ -1159,6 +1202,11 @@ public final class EquipmentAdminCommand implements TabExecutor, AutoCloseable {
                return matching(current.equals(games.dmg.fantasystick.persistence.QuickerRegenerationIISettings.DEFAULT)
                    ? List.of(current) : List.of(current, games.dmg.fantasystick.persistence.QuickerRegenerationIISettings.DEFAULT), args[2]);
            }
+            if (args[1].equals(games.dmg.fantasystick.persistence.HealthStealSettings.KEY) && healthStealSettings != null) {
+                String current = healthStealSettings.value();
+                return matching(current.equals(games.dmg.fantasystick.persistence.HealthStealSettings.DEFAULT)
+                    ? List.of(current) : List.of(current, games.dmg.fantasystick.persistence.HealthStealSettings.DEFAULT), args[2]);
+            }
            if (frostSettings != null && games.dmg.fantasystick.persistence.FrostShardSettings.keys().contains(args[1])) {
                String current = frostSettings.value(args[1]);
                String defaults = games.dmg.fantasystick.persistence.FrostShardSettings.defaultValue(args[1]);
@@ -17,6 +17,7 @@ out-of-combat-healing-interval-seconds: 10
 out-of-combat-healing-amount: 1
 quicker-regeneration-i-bonus-healing: 1
 quicker-regeneration-ii-bonus-healing: 2
+health-steal-healing-per-kill: 1

 # New-character and transferable fantasy progression defaults.
 starting-points: 40
@@ -60,8 +60,8 @@ class FantasyStickLifecycleNativeTest {
            assertTrue(fixture.order.indexOf("CharacterChatNames") >= 0);
            assertTrue(fixture.order.indexOf("CharacterChatNames") < recipe);
            assertNotNull(fixture.packetListener);
-            assertEquals(9, fixture.timers.size(),
-                "Presentation, ability/bond/rally/banner cleanup, provenance, reward retry, recovery and session particles");
+            assertEquals(10, fixture.timers.size(),
+                "Presentation, ability/bond/rally/banner cleanup, provenance, reward retry, recovery, Speed I and session particles");
            assertTrue(fixture.order.indexOf("PartyCombat") >= 0);
            assertTrue(fixture.order.indexOf("PartyCombat") < recipe);
            assertTrue(fixture.order.indexOf("CombatExperience") >= 0);
@@ -15,7 +15,7 @@ class FireballNativeTest {
    @Test void bookAcquisitionEquippedUseAndDirectHitDealOneAttributedScaledDamageWithCooldown() throws Exception {
        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
            f.plugin.setEnabled(true);
-            var a = new FantasyStickLifecycleNativeTest.Actor(data); withInt(data, a, 12);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); withIntAndHealthSteal(data, a, 12);
            f.players.put(a.core.id, a.player); f.activate(a);
            a.core.inventory.getInventory().setSelectedSlot(0);
            PartyBookNativeTest.open(f, a);
@@ -54,6 +54,8 @@ class FireballNativeTest {
            var target = org.mockito.Mockito.mock(org.bukkit.entity.LivingEntity.class);
            org.mockito.Mockito.when(target.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
            org.mockito.Mockito.when(target.getType()).thenReturn(org.bukkit.entity.EntityType.ZOMBIE);
+            org.mockito.Mockito.when(target.getHealth()).thenReturn(1d);
+            org.mockito.Mockito.when(target.getAbsorptionAmount()).thenReturn(0d);
            org.mockito.Mockito.when(target.getLocation()).thenReturn(new org.bukkit.Location(a.world, 10, 65.6, 0));
            var damages = new java.util.ArrayList<org.bukkit.event.entity.EntityDamageByEntityEvent>();
            org.mockito.Mockito.doAnswer(call -> {
@@ -70,8 +72,11 @@ class FireballNativeTest {
            f.dispatcher.accept(new org.bukkit.event.entity.EntityDeathEvent(target, damages.getFirst().getDamageSource(),
                new java.util.ArrayList<>(), 0));
            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
-            assertEquals(BigInteger.TEN, storage.find(a.core.record.id()).get().orElseThrow().experience(),
+            var rewarded = storage.find(a.core.record.id()).get().orElseThrow();
+            assertEquals(BigInteger.TEN, rewarded.experience(),
                "Native projectile attribution reaches the originating character's combat XP");
+            assertEquals(5, a.player.getHealth(), "An actual Fireball final blow activates learned Health Steal");
+            assertEquals(0, java.math.BigDecimal.valueOf(5).compareTo(rewarded.health()));
            org.mockito.Mockito.verify(projectile, org.mockito.Mockito.atLeastOnce()).remove();
            f.dispatcher.accept(new org.bukkit.event.entity.ProjectileHitEvent(projectile, target));
            assertEquals(1, damages.size(), "A projectile can deal custom damage only once");
@@ -360,6 +365,17 @@ class FireballNativeTest {
        PartyBookNativeTest.drain(fixture); PartyBookNativeTest.drain(fixture);
    }

+    private static void withIntAndHealthSteal(Path data, FantasyStickLifecycleNativeTest.Actor actor, int intelligence) throws Exception {
+        var repository = new games.dmg.fantasystick.persistence.YamlCharacterRepository(data);
+        var old = repository.load(actor.core.record.id()).orElseThrow();
+        var stats = new java.util.EnumMap<>(old.stats());
+        stats.put(games.dmg.fantasystick.progression.Stat.INT, BigInteger.valueOf(intelligence));
+        var saved = new games.dmg.fantasystick.persistence.CharacterRecord(old.id(), old.name(), old.revision().add(BigInteger.ONE),
+            stats, old.level(), old.experience(), old.unspentPoints(), java.math.BigDecimal.valueOf(4), old.learned(), old.loadout(),
+            java.util.List.of("health_steal", "", ""), old.cooldowns(), old.restrictedKills(), false, null, null);
+        repository.replace(saved, old.revision());
+    }
+
    private static void withInt(Path data, FantasyStickLifecycleNativeTest.Actor actor, int intelligence) throws Exception {
        var repository = new games.dmg.fantasystick.persistence.YamlCharacterRepository(data);
        var old = repository.load(actor.core.record.id()).orElseThrow();
@@ -0,0 +1,270 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.ArgumentMatchers.anyDouble;
+import static org.mockito.Mockito.*;
+
+import games.dmg.fantasystick.persistence.CharacterRecord;
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import games.dmg.fantasystick.progression.Stat;
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.EnumMap;
+import java.util.List;
+import java.util.UUID;
+import org.bukkit.Location;
+import org.bukkit.entity.EntityType;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.event.entity.EntityDamageByEntityEvent;
+import org.bukkit.event.entity.EntityDamageEvent;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class HealthStealNativeTest {
+    @TempDir Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test void connectedLearnBasicProjectileFantasyDefeatDuplicateAssistAndTransferPathPersistsOnlyFinalBlows() throws Exception {
+        java.nio.file.Files.writeString(data.resolve("config.yml"),
+            "character-swap-cooldown-seconds: 0\nhealth-steal-healing-per-kill: 1\n"
+                + "out-of-combat-healing-delay-seconds: 31536000\n");
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true); assertTrue(f.order.contains("HealthSteal"));
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); makeEligible(data, a, BigDecimal.valueOf(4));
+            var b = new FantasyStickLifecycleNativeTest.Actor(data); makeEligibleAtLevelCap(data, b, BigDecimal.valueOf(4));
+            f.players.put(a.core.id, a.player); f.players.put(b.core.id, b.player); f.activate(a); f.activate(b);
+            PartyBookNativeTest.open(f, a);
+            assertTrue(PartyBookNativeTest.text(a).replaceAll("\\s+", "").contains("HealthStealSTR14,CON12[Learn]"));
+            PartyBookNativeTest.click(f, a, action(a, "[Learn]", "health_steal")); settle(f);
+            var learned = record(f, a); assertEquals("health_steal", learned.passives().getFirst());
+            assertEquals(BigInteger.valueOf(39), learned.unspentPoints()); var activeLoadout = learned.loadout();
+
+            var world = mock(org.bukkit.World.class); when(world.getUID()).thenReturn(UUID.randomUUID());
+            var basicTarget = mob(EntityType.COW, new Location(world, 1, 64, 0), 1);
+            doAnswer(call -> { hit(f, a.player, basicTarget, (Double) call.getArgument(0), false); return null; })
+                .when(basicTarget).damage(anyDouble(), same(a.player));
+            a.core.inventory.getInventory().setSelectedSlot(1);
+            f.dispatcher.accept(new io.papermc.paper.event.player.PrePlayerAttackEntityEvent(a.player, basicTarget, true));
+            die(f, basicTarget); settle(f); settle(f);
+            assertEquals(5, a.player.getHealth()); assertEquals(0, BigDecimal.valueOf(5).compareTo(record(f, a).health()));
+            die(f, basicTarget); settle(f); assertEquals(5, a.player.getHealth(), "A repeated death callback is consumed");
+
+            var projectileTarget = mob(EntityType.ZOMBIE, new Location(world, 2, 64, 0), 1);
+            var arrow = PartyCombatNativeTest.projectile(f, a.player);
+            hit(f, arrow, projectileTarget, 4, false); die(f, projectileTarget); settle(f); settle(f);
+            assertEquals(6, a.player.getHealth(), "Originating-character projectile attribution heals its final blow");
+            var spacingBlocked = mob(EntityType.ZOMBIE, new Location(world, 2, 64, 0), 1);
+            hit(f, a.player, spacingBlocked, 4, false); die(f, spacingBlocked); settle(f); settle(f);
+            assertEquals(7, a.player.getHealth(), "Restricted-XP spacing does not suppress final-blow healing");
+
+            var assisted = mob(EntityType.ZOMBIE, new Location(world, 3, 64, 0), 10);
+            hit(f, a.player, assisted, 1, false); when(assisted.getHealth()).thenReturn(1d);
+            hit(f, b.player, assisted, 4, false); die(f, assisted); settle(f); settle(f);
+            assertEquals(7, a.player.getHealth(), "Contribution without the final blow does not heal");
+            var capped = record(f, b); assertEquals(5, b.player.getHealth()); assertEquals(30, capped.level());
+            assertEquals(BigInteger.valueOf(2_900), capped.experience(),
+                "The final blower heals with multiple contributors even when XP is already capped");
+
+            b.player.setHealth(1); hit(f, a.player, b.player, 4, false);
+            var defeat = new org.bukkit.event.entity.PlayerDeathEvent(b.player, mock(org.bukkit.damage.DamageSource.class),
+                new ArrayList<>(), 0, net.kyori.adventure.text.Component.text("defeat"), true);
+            f.dispatcher.accept(defeat); settle(f); settle(f);
+            assertTrue(defeat.isCancelled()); assertEquals(8, a.player.getHealth(), "Enemy fantasy-character final blows qualify");
+
+            var saved = record(f, a); assertEquals(activeLoadout, saved.loadout());
+            a.core.inventory.setItemInOffHand(null); f.changed(a); PartyBookNativeTest.drain(f); f.awaitCharacterAndReceipt(a);
+            var transferred = new FantasyStickLifecycleNativeTest.Actor(data);
+            transferred.core.inventory.setItemInOffHand(new games.dmg.fantasystick.items.CharacterSheets().create(saved));
+            f.players.put(transferred.core.id, transferred.player); f.activate(transferred);
+            assertEquals(8, transferred.player.getHealth());
+            assertEquals(saved.passives(), storage(f).find(saved.id()).get().orElseThrow().passives());
+            PartyBookNativeTest.open(f, transferred);
+            PartyBookNativeTest.click(f, transferred, action(transferred, "[Unlearn]", "health_steal")); settle(f);
+            var unlearned = storage(f).find(saved.id()).get().orElseThrow();
+            assertFalse(unlearned.passives().contains("health_steal"));
+            assertEquals(saved.unspentPoints().add(BigInteger.ONE), unlearned.unspentPoints());
+            var afterUnlearn = mob(EntityType.COW, new Location(world, 5, 64, 0), 1);
+            hit(f, transferred.player, afterUnlearn, 4, false); die(f, afterUnlearn); settle(f);
+            assertEquals(8, transferred.player.getHealth(), "Unlearning removes only the passive's future healing");
+        }
+    }
+
+    @Test void configuredZeroAndOrdinaryPlayerTargetPerformNoHealthWriteOrPublication() throws Exception {
+        java.nio.file.Files.writeString(data.resolve("config.yml"),
+            "health-steal-healing-per-kill: 0\nout-of-combat-healing-delay-seconds: 31536000\n");
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true); var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            makeEligible(data, a, BigDecimal.valueOf(4), List.of("health_steal", "", ""));
+            f.players.put(a.core.id, a.player); f.activate(a);
+            var before = record(f, a); var world = mock(org.bukkit.World.class); when(world.getUID()).thenReturn(UUID.randomUUID());
+            var target = mob(EntityType.WARDEN, new Location(world, 0, 64, 0), 1);
+            hit(f, a.player, target, 4, false); die(f, target); settle(f);
+            assertEquals(0, before.health().compareTo(record(f, a).health())); assertEquals(4, a.player.getHealth());
+
+            var ordinary = mock(org.bukkit.entity.Player.class); when(ordinary.getUniqueId()).thenReturn(UUID.randomUUID());
+            when(ordinary.getHealth()).thenReturn(1d); when(ordinary.getAbsorptionAmount()).thenReturn(0d);
+            hit(f, a.player, ordinary, 4, false);
+            f.dispatcher.accept(new org.bukkit.event.entity.PlayerDeathEvent(ordinary, mock(org.bukkit.damage.DamageSource.class),
+                new ArrayList<>(), 0, net.kyori.adventure.text.Component.text("death"), false));
+            settle(f); assertEquals(4, a.player.getHealth(), "Ordinary player targets never qualify");
+        }
+    }
+
+    @Test void changedValueCapsAtFullHealthAndCancellationFailureOrStaleSourceNeverPublishes() throws Exception {
+        java.nio.file.Files.writeString(data.resolve("config.yml"),
+            "character-swap-cooldown-seconds: 0\nhealth-steal-healing-per-kill: 3\n"
+                + "out-of-combat-healing-delay-seconds: 31536000\n");
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            class Gate implements org.bukkit.event.Listener {
+                final java.util.ArrayList<Double> amounts = new java.util.ArrayList<>(); boolean veto;
+                @org.bukkit.event.EventHandler(priority = org.bukkit.event.EventPriority.HIGHEST)
+                public void heal(org.bukkit.event.entity.EntityRegainHealthEvent event) {
+                    amounts.add(event.getAmount()); if (veto) event.setCancelled(true);
+                }
+            }
+            var gate = new Gate(); f.plugin.getServer().getPluginManager().registerEvents(gate, f.plugin);
+            var world = mock(org.bukkit.World.class); when(world.getUID()).thenReturn(UUID.randomUUID());
+
+            var changed = new FantasyStickLifecycleNativeTest.Actor(data);
+            makeEligible(data, changed, BigDecimal.valueOf(4), List.of("health_steal", "", ""));
+            f.players.put(changed.core.id, changed.player); f.activate(changed);
+            var first = mob(EntityType.BEE, new Location(world, 0, 64, 0), 1);
+            hit(f, changed.player, first, 4, false); die(f, first); settle(f); settle(f);
+            assertEquals(7, changed.player.getHealth()); assertEquals(List.of(3d), gate.amounts);
+
+            gate.veto = true; var cancelled = mob(EntityType.COW, new Location(world, 1, 64, 0), 1);
+            hit(f, changed.player, cancelled, 4, false); die(f, cancelled); settle(f);
+            assertEquals(7, changed.player.getHealth()); assertEquals(List.of(3d, 3d), gate.amounts);
+            gate.veto = false;
+            int beforeInvalidDamage = gate.amounts.size();
+            var cancelledDamage = mob(EntityType.COW, new Location(world, 1.25, 64, 0), 1);
+            hit(f, changed.player, cancelledDamage, 4, true); die(f, cancelledDamage); settle(f);
+            var zeroDamage = mob(EntityType.COW, new Location(world, 1.5, 64, 0), 1);
+            hit(f, changed.player, zeroDamage, 0, false); die(f, zeroDamage); settle(f);
+            assertEquals(beforeInvalidDamage, gate.amounts.size(), "Cancelled and zero damage cannot establish a final blow");
+
+            var full = new FantasyStickLifecycleNativeTest.Actor(data);
+            makeEligible(data, full, BigDecimal.valueOf(22), List.of("health_steal", "", ""));
+            f.players.put(full.core.id, full.player); f.activate(full); int beforeFull = gate.amounts.size();
+            var fullTarget = mob(EntityType.WARDEN, new Location(world, 2, 64, 0), 1);
+            hit(f, full.player, fullTarget, 4, false); die(f, fullTarget); settle(f);
+            assertEquals(beforeFull, gate.amounts.size()); assertEquals(22, full.player.getHealth());
+
+            var stale = new FantasyStickLifecycleNativeTest.Actor(data);
+            makeEligible(data, stale, BigDecimal.valueOf(4), List.of("health_steal", "", ""));
+            f.players.put(stale.core.id, stale.player); f.activate(stale);
+            var staleTarget = mob(EntityType.ZOMBIE, new Location(world, 3, 64, 0), 1);
+            hit(f, stale.player, staleTarget, 4, false);
+            stale.core.inventory.setItemInOffHand(null); f.changed(stale); PartyBookNativeTest.drain(f); f.awaitCharacterAndReceipt(stale);
+            int beforeStale = gate.amounts.size(); die(f, staleTarget); settle(f);
+            assertEquals(beforeStale, gate.amounts.size(), "A transferred source cannot receive redirected healing");
+
+            var failed = new FantasyStickLifecycleNativeTest.Actor(data);
+            makeEligible(data, failed, BigDecimal.valueOf(4), List.of("health_steal", "", ""));
+            f.players.put(failed.core.id, failed.player); f.activate(failed);
+            var failedTarget = mob(EntityType.COW, new Location(world, 4, 64, 0), 1);
+            hit(f, failed.player, failedTarget, 4, false);
+            Runnable callback;
+            try (var channel = java.nio.channels.FileChannel.open(data.resolve("characters").resolve(".records.lock"),
+                     java.nio.file.StandardOpenOption.CREATE, java.nio.file.StandardOpenOption.WRITE);
+                 var lock = channel.lock()) {
+                assertTrue(lock.isValid()); die(f, failedTarget);
+                callback = f.tasks.poll(5, java.util.concurrent.TimeUnit.SECONDS); assertNotNull(callback);
+            }
+            callback.run(); assertEquals(4, failed.player.getHealth());
+            assertEquals(0, BigDecimal.valueOf(4).compareTo(record(f, failed).health()));
+        }
+    }
+
+    @Test void configurationIsDurablePermissionAwareAndPrefixFiltered() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true); var sender = new EquipmentAdminCommandNativeTest.Sender();
+            assertEquals(List.of("health-steal-healing-per-kill"),
+                f.command.tabComplete(sender.port, "fantasystick", new String[]{"config", "health-steal"}));
+            assertEquals(List.of("1"), f.command.tabComplete(sender.port, "fantasystick",
+                new String[]{"config", "health-steal-healing-per-kill", ""}));
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "health-steal-healing-per-kill"});
+            assertTrue(sender.messages.getLast().contains("=1")); sender.allowed = false;
+            assertTrue(f.command.tabComplete(sender.port, "fantasystick", new String[]{"config", "health-steal"}).isEmpty());
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "health-steal-healing-per-kill", "3"});
+            assertTrue(sender.messages.getLast().contains("Permission denied")); sender.allowed = true;
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "health-steal-healing-per-kill", "3"});
+            var callback = f.tasks.poll(5, java.util.concurrent.TimeUnit.SECONDS); assertNotNull(callback); callback.run();
+            f.plugin.setEnabled(false); f.plugin.setEnabled(true);
+            var settings = (games.dmg.fantasystick.persistence.HealthStealSettings)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "healthStealSettings");
+            assertEquals("3", settings.value());
+        }
+    }
+
+    private static void makeEligible(Path data, FantasyStickLifecycleNativeTest.Actor actor, BigDecimal health) throws Exception {
+        makeEligible(data, actor, health, List.of("", "", ""));
+    }
+    private static void makeEligible(Path data, FantasyStickLifecycleNativeTest.Actor actor, BigDecimal health,
+                                     List<String> passives) throws Exception {
+        var repository = new games.dmg.fantasystick.persistence.YamlCharacterRepository(data);
+        var old = repository.load(actor.core.record.id()).orElseThrow(); var stats = new EnumMap<>(old.stats());
+        stats.put(Stat.STR, BigInteger.valueOf(14)); stats.put(Stat.CON, BigInteger.valueOf(12));
+        repository.replace(new CharacterRecord(old.id(), old.name(), old.revision().add(BigInteger.ONE), stats,
+            old.level(), old.experience(), BigInteger.valueOf(40), health, old.learned(), old.loadout(), passives,
+            old.cooldowns(), old.restrictedKills(), false, null, null), old.revision());
+    }
+    private static void makeEligibleAtLevelCap(Path data, FantasyStickLifecycleNativeTest.Actor actor,
+                                                BigDecimal health) throws Exception {
+        makeEligible(data, actor, health, List.of("health_steal", "", ""));
+        var repository = new games.dmg.fantasystick.persistence.YamlCharacterRepository(data);
+        var old = repository.load(actor.core.record.id()).orElseThrow();
+        repository.replace(new CharacterRecord(old.id(), old.name(), old.revision().add(BigInteger.ONE), old.stats(),
+            30, BigInteger.valueOf(2_900), old.unspentPoints(), old.health(), old.learned(), old.loadout(), old.passives(),
+            old.cooldowns(), old.restrictedKills(), false, null, null), old.revision());
+    }
+    private static EntityDamageByEntityEvent hit(FantasyStickLifecycleNativeTest.Fixture f, org.bukkit.entity.Entity source,
+                                                   org.bukkit.entity.Entity target, double amount, boolean cancelled) {
+        var damage = mock(org.bukkit.damage.DamageSource.class); when(damage.getCausingEntity()).thenReturn(source);
+        when(damage.getDirectEntity()).thenReturn(source);
+        var event = new EntityDamageByEntityEvent(source, target, EntityDamageEvent.DamageCause.ENTITY_ATTACK, damage, amount);
+        event.setCancelled(cancelled); f.dispatcher.accept(event); return event;
+    }
+    private static void die(FantasyStickLifecycleNativeTest.Fixture f, LivingEntity target) {
+        f.dispatcher.accept(new org.bukkit.event.entity.EntityDeathEvent(target,
+            mock(org.bukkit.damage.DamageSource.class), new ArrayList<>(), 0));
+    }
+    private static LivingEntity mob(EntityType type, Location location, double health) {
+        var entity = mock(LivingEntity.class); when(entity.getUniqueId()).thenReturn(UUID.randomUUID());
+        when(entity.getType()).thenReturn(type); when(entity.getHealth()).thenReturn(health); when(entity.getAbsorptionAmount()).thenReturn(0d);
+        when(entity.getLocation()).thenAnswer(ignored -> location.clone()); when(entity.getWorld()).thenReturn(location.getWorld());
+        when(entity.getPersistentDataContainer()).thenReturn(new org.bukkit.craftbukkit.persistence.CraftPersistentDataContainer(
+            new org.bukkit.craftbukkit.persistence.CraftPersistentDataTypeRegistry()));
+        return entity;
+    }
+    private static void settle(FantasyStickLifecycleNativeTest.Fixture f) throws Exception {
+        PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+    }
+    private static CharacterStorage storage(FantasyStickLifecycleNativeTest.Fixture f) {
+        return (CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+    }
+    private static CharacterRecord record(FantasyStickLifecycleNativeTest.Fixture f,
+                                           FantasyStickLifecycleNativeTest.Actor actor) throws Exception {
+        return storage(f).find(actor.core.record.id()).get().orElseThrow();
+    }
+    private static net.minecraft.network.chat.ClickEvent.Custom action(
+            FantasyStickLifecycleNativeTest.Actor actor, String label, String passive) {
+        var content = org.bukkit.craftbukkit.inventory.CraftItemStack.asNMSCopy(actor.books.getLast())
+            .get(net.minecraft.core.component.DataComponents.WRITTEN_BOOK_CONTENT); assertNotNull(content);
+        for (var page : content.pages()) { var found = action(page.raw(), label, passive); if (found != null) return found; }
+        throw new AssertionError("Missing " + label + " for " + passive);
+    }
+    private static net.minecraft.network.chat.ClickEvent.Custom action(
+            net.minecraft.network.chat.Component component, String label, String passive) {
+        if (component.getString().equals(label)
+                && component.getStyle().getClickEvent() instanceof net.minecraft.network.chat.ClickEvent.Custom custom
+                && custom.payload().orElse(null) instanceof net.minecraft.nbt.StringTag payload
+                && payload.value().contains(":" + passive)) return custom;
+        for (var child : component.getSiblings()) { var found = action(child, label, passive); if (found != null) return found; }
+        return null;
+    }
+}
@@ -35,7 +35,7 @@ class QuickerRegenerationNativeTest {
            assertTrue(active > 0 && active < passive && passive < activeIndex && activeIndex < passiveIndex && passiveIndex < party);
            assertTrue(pages.get(passive).getString().contains("1: No Passive"));
            assertTrue(pages.get(passiveIndex).getString().replace("\n", "").contains("Quicker Regeneration I"));
-            var jump = firstChangePage(pages.get(passiveIndex)); assertNotNull(jump);
+            var jump = changePageTo(pages.get(passiveIndex), pages, "Quicker Regeneration I"); assertNotNull(jump);
            String detail = pages.get(jump.page() - 1).getString();
            assertTrue(detail.replaceAll("\\s+", "").startsWith("QuickerRegenerationICON12,WIS12[Learn]"), detail);
            assertTrue(detail.replaceAll("\\s+", "").contains("out-of-combatrecoverypulse"));
@@ -133,9 +133,15 @@ class QuickerRegenerationNativeTest {
        for (int i = 0; i < pages.size(); i++) if (pages.get(i).getString().startsWith(text)) return i;
        return -1;
    }
-    private static net.minecraft.network.chat.ClickEvent.ChangePage firstChangePage(net.minecraft.network.chat.Component component) {
-        if (component.getStyle().getClickEvent() instanceof net.minecraft.network.chat.ClickEvent.ChangePage page) return page;
-        for (var child : component.getSiblings()) { var found = firstChangePage(child); if (found != null) return found; }
+    private static net.minecraft.network.chat.ClickEvent.ChangePage changePageTo(
+            net.minecraft.network.chat.Component component, List<net.minecraft.network.chat.Component> pages, String heading) {
+        if (component.getStyle().getClickEvent() instanceof net.minecraft.network.chat.ClickEvent.ChangePage page
+                && page.page() > 0 && page.page() <= pages.size()
+                && pages.get(page.page() - 1).getString().replaceAll("\\s+", "")
+                    .startsWith(heading.replaceAll("\\s+", ""))) return page;
+        for (var child : component.getSiblings()) {
+            var found = changePageTo(child, pages, heading); if (found != null) return found;
+        }
        return null;
    }
    private static net.minecraft.network.chat.ClickEvent.Custom custom(List<net.minecraft.network.chat.Component> pages, String id) {
@@ -0,0 +1,193 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.ArgumentMatchers.*;
+import static org.mockito.Mockito.*;
+
+import games.dmg.fantasystick.ability.AbilityExecution;
+import games.dmg.fantasystick.ability.OutgoingDamageBonus;
+import games.dmg.fantasystick.ability.RallyingCry;
+import games.dmg.fantasystick.party.PartyRoster;
+import games.dmg.fantasystick.passive.SpeedI;
+import games.dmg.fantasystick.persistence.CharacterRecord;
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import games.dmg.fantasystick.persistence.YamlCharacterRepository;
+import games.dmg.fantasystick.progression.Stat;
+import games.dmg.fantasystick.session.ControlInput;
+import games.dmg.fantasystick.session.EquipmentSessions;
+import java.math.BigInteger;
+import java.nio.file.Path;
+import java.util.EnumMap;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import org.bukkit.Location;
+import org.bukkit.entity.Player;
+import org.bukkit.potion.PotionEffect;
+import org.bukkit.potion.PotionEffectType;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class SpeedINativeTest {
+    @TempDir Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test void connectedLearnExitTransferUnlearnAndDefeatOwnOnlyTheCharacterSpeedLayer() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true); var a = new FantasyStickLifecycleNativeTest.Actor(data); withDex(data, a, List.of("", "", ""));
+            var aEffects = effects(a.player); f.players.put(a.core.id, a.player); f.activate(a);
+            var speed = (SpeedI) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "speedI");
+            PartyBookNativeTest.open(f, a); assertTrue(PartyBookNativeTest.text(a).replaceAll("\\s+", "").contains("SpeedIDEX14[Learn]"));
+            PartyBookNativeTest.click(f, a, action(a, "[Learn]", "speed_i")); settle(f); speed.sweep();
+            var learned = record(f, a); assertEquals(List.of("speed_i", "", ""), learned.passives());
+            assertEquals(BigInteger.valueOf(39), learned.unspentPoints()); assertEquals(0, aEffects.get(PotionEffectType.SPEED).getAmplifier());
+
+            var sheet = a.core.inventory.getItemInOffHand().clone(); a.core.inventory.setItemInOffHand(null);
+            f.changed(a); PartyBookNativeTest.drain(f); f.awaitCharacterAndReceipt(a); speed.sweep();
+            assertFalse(aEffects.containsKey(PotionEffectType.SPEED));
+            var b = new FantasyStickLifecycleNativeTest.Actor(data); var bEffects = effects(b.player);
+            b.core.inventory.setItemInOffHand(sheet); f.players.put(b.core.id, b.player); f.activate(b); speed.sweep();
+            assertEquals(0, bEffects.get(PotionEffectType.SPEED).getAmplifier());
+            PartyBookNativeTest.open(f, b); PartyBookNativeTest.click(f, b, action(b, "[Unlearn]", "speed_i")); settle(f); speed.sweep();
+            var unlearned = storage(f).find(learned.id()).get().orElseThrow(); assertFalse(unlearned.passives().contains("speed_i"));
+            assertEquals(learned.unspentPoints().add(BigInteger.ONE), unlearned.unspentPoints()); assertFalse(bEffects.containsKey(PotionEffectType.SPEED));
+            PartyBookNativeTest.open(f, b); Runnable failed;
+            try (var channel = java.nio.channels.FileChannel.open(data.resolve("characters").resolve(".records.lock"),
+                     java.nio.file.StandardOpenOption.CREATE, java.nio.file.StandardOpenOption.WRITE);
+                 var lock = channel.lock()) {
+                assertTrue(lock.isValid()); PartyBookNativeTest.click(f, b, action(b, "[Learn]", "speed_i"));
+                failed = f.tasks.poll(5, java.util.concurrent.TimeUnit.SECONDS); assertNotNull(failed);
+            }
+            failed.run(); speed.sweep(); assertFalse(bEffects.containsKey(PotionEffectType.SPEED));
+            assertFalse(storage(f).find(learned.id()).get().orElseThrow().passives().contains("speed_i"));
+            b.core.inventory.setItemInOffHand(null); f.changed(b); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            storage(f).find(learned.id()).get(); f.receipts().find(b.core.id).toCompletableFuture().get();
+
+            withDex(data, a, List.of("speed_i", "", ""));
+            var c = new FantasyStickLifecycleNativeTest.Actor(data); var cEffects = effects(c.player);
+            c.core.inventory.setItemInOffHand(new games.dmg.fantasystick.items.CharacterSheets().create(
+                new YamlCharacterRepository(data).load(a.core.record.id()).orElseThrow()));
+            f.players.put(c.core.id, c.player); f.activate(c); speed.sweep(); assertTrue(cEffects.containsKey(PotionEffectType.SPEED));
+            c.player.setHealth(1);
+            var death = new org.bukkit.event.entity.PlayerDeathEvent(c.player, mock(org.bukkit.damage.DamageSource.class),
+                new java.util.ArrayList<>(), 0, net.kyori.adventure.text.Component.text("defeat"), true);
+            f.dispatcher.accept(death); settle(f); speed.sweep(); assertFalse(cEffects.containsKey(PotionEffectType.SPEED));
+        }
+    }
+
+    @Test void milkAndExpiredEffectsReapplyWhileStrongerAndCleanupPathsPreserveUnrelatedSpeed() {
+        var sessions = mock(EquipmentSessions.class); var player = mock(Player.class); var effects = effects(player);
+        UUID playerId = UUID.randomUUID(); var active = new EquipmentSessions.Active(playerId, UUID.randomUUID(), UUID.randomUUID());
+        var learned = mock(CharacterRecord.class); when(learned.passives()).thenReturn(List.of("speed_i", "", "")); when(learned.dead()).thenReturn(false);
+        when(player.getUniqueId()).thenReturn(playerId); when(sessions.activeCharacters()).thenReturn(List.of(new EquipmentSessions.ActiveCharacter(active, learned)));
+        when(sessions.current(active)).thenReturn(true); when(sessions.currentRecord(active)).thenReturn(java.util.Optional.of(learned));
+        when(sessions.currentPlayer(active)).thenReturn(java.util.Optional.of(player));
+        var speed = new SpeedI(sessions); assertEquals(Map.of(Stat.DEX, BigInteger.valueOf(14)), speed.definition().requirements());
+        speed.sweep(); assertEquals(0, effects.get(PotionEffectType.SPEED).getAmplifier());
+        speed.sweep(); verify(player, times(1)).addPotionEffect(any(), eq(true));
+        effects.clear(); speed.sweep(); verify(player, times(2)).addPotionEffect(any(), eq(true));
+
+        var stronger = new PotionEffect(PotionEffectType.SPEED, 200, 1); effects.put(PotionEffectType.SPEED, stronger); speed.sweep();
+        assertSame(stronger, effects.get(PotionEffectType.SPEED));
+        when(learned.passives()).thenReturn(List.of("", "", "")); speed.sweep();
+        assertSame(stronger, effects.get(PotionEffectType.SPEED), "Cleanup cannot remove a stronger unrelated effect");
+        when(learned.passives()).thenReturn(List.of("speed_i", "", "")); effects.clear(); speed.sweep();
+        assertEquals(0, effects.get(PotionEffectType.SPEED).getAmplifier(), "The passive resumes after stronger Speed expires");
+        speed.close(); assertFalse(effects.containsKey(PotionEffectType.SPEED));
+
+        var equalSessions = mock(EquipmentSessions.class); var equalPlayer = mock(Player.class); var equalEffects = effects(equalPlayer);
+        UUID equalId = UUID.randomUUID(); var equalActive = new EquipmentSessions.Active(equalId, UUID.randomUUID(), UUID.randomUUID());
+        var equalRecord = mock(CharacterRecord.class); when(equalRecord.passives()).thenReturn(List.of("speed_i", "", ""));
+        when(equalPlayer.getUniqueId()).thenReturn(equalId); when(equalSessions.activeCharacters()).thenReturn(List.of(new EquipmentSessions.ActiveCharacter(equalActive, equalRecord)));
+        when(equalSessions.current(equalActive)).thenReturn(true); when(equalSessions.currentRecord(equalActive)).thenReturn(java.util.Optional.of(equalRecord));
+        when(equalSessions.currentPlayer(equalActive)).thenReturn(java.util.Optional.of(equalPlayer));
+        var equal = new PotionEffect(PotionEffectType.SPEED, 40, 0); equalEffects.put(PotionEffectType.SPEED, equal);
+        var equalSpeed = new SpeedI(equalSessions); equalSpeed.sweep(); assertSame(equal, equalEffects.get(PotionEffectType.SPEED));
+        equalEffects.clear(); equalSpeed.sweep(); assertTrue(equalEffects.get(PotionEffectType.SPEED).isInfinite()); equalSpeed.close();
+
+        var weaker = new PotionEffect(PotionEffectType.SPEED, 4, -1); equalEffects.put(PotionEffectType.SPEED, weaker);
+        var weakerSpeed = new SpeedI(equalSessions); weakerSpeed.sweep();
+        assertEquals(0, equalEffects.get(PotionEffectType.SPEED).getAmplifier());
+        when(equalRecord.passives()).thenReturn(List.of("", "", "")); weakerSpeed.sweep();
+        assertEquals(-1, equalEffects.get(PotionEffectType.SPEED).getAmplifier(), "An unexpired weaker native layer is preserved");
+        weakerSpeed.close();
+
+        when(equalRecord.passives()).thenReturn(List.of("speed_i", "", ""));
+        equalEffects.put(PotionEffectType.SPEED, new PotionEffect(PotionEffectType.SPEED, 1, -1));
+        var expiredWeak = new SpeedI(equalSessions); expiredWeak.sweep(); expiredWeak.sweep();
+        when(equalRecord.passives()).thenReturn(List.of("", "", "")); expiredWeak.sweep();
+        assertFalse(equalEffects.containsKey(PotionEffectType.SPEED), "An unrelated weaker layer that expired is not restored");
+        expiredWeak.close();
+    }
+
+    @Test void rallyOverlapNeverStacksAndEitherOwnerLeavesTheOtherApplicableLayer() {
+        var sessions = mock(EquipmentSessions.class); var parties = mock(PartyRoster.class); var player = mock(Player.class);
+        var effects = effects(player); UUID id = UUID.randomUUID(); var active = new EquipmentSessions.Active(id, UUID.randomUUID(), UUID.randomUUID());
+        var record = mock(CharacterRecord.class); when(record.passives()).thenReturn(List.of("speed_i", "", ""));
+        when(player.getUniqueId()).thenReturn(id); when(player.getLocation()).thenReturn(new Location(mock(org.bukkit.World.class), 0, 64, 0));
+        when(player.getNearbyEntities(anyDouble(), anyDouble(), anyDouble())).thenReturn(List.of());
+        when(sessions.active(id)).thenReturn(java.util.Optional.of(active)); when(sessions.current(active)).thenReturn(true);
+        when(sessions.activeCharacters()).thenReturn(List.of(new EquipmentSessions.ActiveCharacter(active, record)));
+        when(sessions.currentRecord(active)).thenReturn(java.util.Optional.of(record)); when(sessions.currentPlayer(active)).thenReturn(java.util.Optional.of(player));
+        var speed = new SpeedI(sessions); speed.sweep();
+        var rally = new RallyingCry(RallyingCry.Settings.defaults(), sessions, parties,
+            new OutgoingDamageBonus(sessions, parties, ignored -> { }));
+        var execution = mock(AbilityExecution.class); var input = mock(ControlInput.class);
+        when(input.player()).thenReturn(player); when(input.session()).thenReturn(active); when(execution.input()).thenReturn(input);
+        when(execution.stillCurrent()).thenReturn(true); when(execution.definition()).thenReturn(rally.definition());
+        rally.activate(execution); assertEquals(0, effects.get(PotionEffectType.SPEED).getAmplifier());
+        rally.close(); assertTrue(effects.containsKey(PotionEffectType.SPEED), "Rally cleanup leaves the passive-owned Speed I");
+        speed.close(); assertFalse(effects.containsKey(PotionEffectType.SPEED));
+
+        var rallyFirst = new RallyingCry(RallyingCry.Settings.defaults(), sessions, parties,
+            new OutgoingDamageBonus(sessions, parties, ignored -> { }));
+        when(execution.definition()).thenReturn(rallyFirst.definition()); rallyFirst.activate(execution);
+        assertTrue(effects.containsKey(PotionEffectType.SPEED));
+        var passiveSecond = new SpeedI(sessions); passiveSecond.sweep(); rallyFirst.close();
+        assertFalse(effects.containsKey(PotionEffectType.SPEED)); passiveSecond.sweep();
+        assertTrue(effects.containsKey(PotionEffectType.SPEED), "The learned passive resumes after Rally-owned Speed I ends");
+        passiveSecond.close();
+    }
+
+    private static Map<PotionEffectType, PotionEffect> effects(Player player) {
+        var result = new HashMap<PotionEffectType, PotionEffect>();
+        doAnswer(call -> result.get(call.getArgument(0))).when(player).getPotionEffect(any());
+        doAnswer(call -> { PotionEffect effect = call.getArgument(0); result.put(effect.getType(), effect); return true; })
+            .when(player).addPotionEffect(any(), eq(true));
+        doAnswer(call -> { result.remove(call.getArgument(0)); return null; }).when(player).removePotionEffect(any()); return result;
+    }
+    private static void withDex(Path data, FantasyStickLifecycleNativeTest.Actor actor, List<String> passives) throws Exception {
+        var repository = new YamlCharacterRepository(data); var old = repository.load(actor.core.record.id()).orElseThrow();
+        var stats = new EnumMap<>(old.stats()); stats.put(Stat.DEX, BigInteger.valueOf(14));
+        repository.replace(new CharacterRecord(old.id(), old.name(), old.revision().add(BigInteger.ONE), stats, old.level(), old.experience(),
+            old.unspentPoints(), old.health(), old.learned(), old.loadout(), passives, old.cooldowns(), old.restrictedKills(), false, null, null), old.revision());
+    }
+    private static CharacterStorage storage(FantasyStickLifecycleNativeTest.Fixture f) {
+        return (CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+    }
+    private static CharacterRecord record(FantasyStickLifecycleNativeTest.Fixture f,
+                                           FantasyStickLifecycleNativeTest.Actor actor) throws Exception {
+        return storage(f).find(actor.core.record.id()).get().orElseThrow();
+    }
+    private static void settle(FantasyStickLifecycleNativeTest.Fixture f) throws Exception {
+        PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+    }
+    private static net.minecraft.network.chat.ClickEvent.Custom action(
+            FantasyStickLifecycleNativeTest.Actor actor, String label, String passive) {
+        var content = org.bukkit.craftbukkit.inventory.CraftItemStack.asNMSCopy(actor.books.getLast())
+            .get(net.minecraft.core.component.DataComponents.WRITTEN_BOOK_CONTENT); assertNotNull(content);
+        for (var page : content.pages()) { var found = action(page.raw(), label, passive); if (found != null) return found; }
+        throw new AssertionError("Missing " + label + " for " + passive);
+    }
+    private static net.minecraft.network.chat.ClickEvent.Custom action(
+            net.minecraft.network.chat.Component component, String label, String passive) {
+        if (component.getString().equals(label)
+                && component.getStyle().getClickEvent() instanceof net.minecraft.network.chat.ClickEvent.Custom custom
+                && custom.payload().orElse(null) instanceof net.minecraft.nbt.StringTag payload
+                && payload.value().contains(":" + passive)) return custom;
+        for (var child : component.getSiblings()) { var found = action(child, label, passive); if (found != null) return found; }
+        return null;
+    }
+}
@@ -88,7 +88,8 @@ class DistributionTest {
            assertTrue(defaults.contains("sheet-resource-pack-sha1: ''"));
            for (String setting : java.util.List.of("out-of-combat-healing-delay-seconds: 30",
                    "out-of-combat-healing-interval-seconds: 10", "out-of-combat-healing-amount: 1",
-                    "quicker-regeneration-i-bonus-healing: 1", "quicker-regeneration-ii-bonus-healing: 2")) {
+                    "quicker-regeneration-i-bonus-healing: 1", "quicker-regeneration-ii-bonus-healing: 2",
+                    "health-steal-healing-per-kill: 1")) {
                assertTrue(defaults.contains(setting), "Missing packaged recovery default: " + setting);
            }
            assertTrue(JavaPlugin.class.isAssignableFrom(FantasyStickPlugin.class));
@@ -0,0 +1,42 @@
+package games.dmg.fantasystick.persistence;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class HealthStealSettingsTest {
+    @TempDir Path data;
+
+    @Test void validatesReviewedBoundsAndPersistsBeforePublication() throws Exception {
+        assertEquals(java.math.BigInteger.ONE, HealthStealSettings.parse("1").healing());
+        assertEquals(java.math.BigInteger.ZERO, HealthStealSettings.parse("0").healing());
+        assertEquals(java.math.BigInteger.valueOf(1024), HealthStealSettings.parse("1024").healing());
+        for (String invalid : java.util.List.of("-1", "1025", "1.5", "x")) {
+            assertThrows(IllegalArgumentException.class, () -> HealthStealSettings.parse(invalid));
+        }
+        Files.writeString(data.resolve("config.yml"), "unrelated: retained\n");
+        try (var settings = new HealthStealSettings(data, "1")) {
+            var update = settings.set("4").toCompletableFuture().get(5, TimeUnit.SECONDS);
+            assertEquals("1", settings.value()); assertTrue(settings.publish(update)); assertEquals("4", settings.value());
+            var saved = (Map<?, ?>) new org.yaml.snakeyaml.Yaml().load(Files.readString(data.resolve("config.yml")));
+            assertEquals("retained", saved.get("unrelated")); assertEquals("4", String.valueOf(saved.get(HealthStealSettings.KEY)));
+        }
+    }
+
+    @Test void failedWriteAndCloseRetainTheEffectiveValue() throws Exception {
+        try (var settings = new HealthStealSettings(data, "1", (from, to) -> { throw new java.io.IOException("simulated"); })) {
+            assertThrows(java.util.concurrent.ExecutionException.class,
+                () -> settings.set("4").toCompletableFuture().get(5, TimeUnit.SECONDS));
+            assertEquals("1", settings.value());
+        }
+        var closed = new HealthStealSettings(data.resolve("closed"), "1"); closed.close();
+        assertThrows(java.util.concurrent.ExecutionException.class,
+            () -> closed.set("4").toCompletableFuture().get(5, TimeUnit.SECONDS));
+        closed.drained().toCompletableFuture().get(5, TimeUnit.SECONDS);
+    }
+}
Author	SHA1	Message	Date
dmg	1f3a1fe396	feat(passives): add speed I Release / release (push) Successful in 9m25s Details	2026-09-21 00:05:25 -04:00
dmg	139cc4519b	feat(passives): add health steal Release / release (push) Successful in 11m11s Details	2026-09-20 23:52:33 -04:00