feat(ability): add Shield Bash

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

@@ -49,6 +49,20 @@ public final class FantasyStickPlugin extends JavaPlugin {
     private games.dmg.fantasystick.ability.AbilityRegistry abilityRegistry;
     private games.dmg.fantasystick.ability.AbilityEngine abilityEngine;
     private games.dmg.fantasystick.ability.Fireball fireball;
+    private games.dmg.fantasystick.ability.FrostShard frostShard;
+    private games.dmg.fantasystick.persistence.FrostShardSettings frostShardSettings;
+    private games.dmg.fantasystick.ability.Longbow longbow;
+    private games.dmg.fantasystick.persistence.LongbowSettings longbowSettings;
+    private games.dmg.fantasystick.ability.Quickstep quickstep;
+    private games.dmg.fantasystick.persistence.QuickstepSettings quickstepSettings;
+    private games.dmg.fantasystick.ability.SecondWind secondWind;
+    private games.dmg.fantasystick.persistence.SecondWindSettings secondWindSettings;
+    private games.dmg.fantasystick.ability.CombatMitigation combatMitigation;
+    private games.dmg.fantasystick.ability.StoneSkin stoneSkin;
+    private games.dmg.fantasystick.ability.ShieldBash shieldBash;
+    private games.dmg.fantasystick.persistence.ShieldBashSettings shieldBashSettings;
+    private games.dmg.fantasystick.persistence.StoneSkinSettings stoneSkinSettings;
+    private games.dmg.fantasystick.ability.GreatSword greatSword;
     private games.dmg.fantasystick.ability.Revive revive;
     private games.dmg.fantasystick.persistence.RevivalStore revivals;
     private games.dmg.fantasystick.session.NutritionPolicy nutritionPolicy;
@@ -78,6 +92,19 @@ public final class FantasyStickPlugin extends JavaPlugin {
             var rules = progressionRules();
             var rewardRules = combatRewardRules();
             var fireballSettings = fireballSettings();
+            var greatSwordSettings = greatSwordSettings();
+            var frostShardConfiguration = frostShardConfiguration();
+            var frostShardInitial = games.dmg.fantasystick.persistence.FrostShardSettings.parse(frostShardConfiguration);
+            var longbowConfiguration = longbowConfiguration();
+            var longbowInitial = games.dmg.fantasystick.persistence.LongbowSettings.parse(longbowConfiguration);
+            var quickstepConfiguration = quickstepConfiguration();
+            var quickstepInitial = games.dmg.fantasystick.persistence.QuickstepSettings.parse(quickstepConfiguration);
+            var secondWindConfiguration = secondWindConfiguration();
+            var secondWindInitial = games.dmg.fantasystick.persistence.SecondWindSettings.parse(secondWindConfiguration);
+            var stoneSkinConfiguration = stoneSkinConfiguration();
+            var stoneSkinInitial = games.dmg.fantasystick.persistence.StoneSkinSettings.parse(stoneSkinConfiguration);
+            var shieldBashConfiguration = shieldBashConfiguration();
+            var shieldBashInitial = games.dmg.fantasystick.persistence.ShieldBashSettings.parse(shieldBashConfiguration);
             var factory = new CharacterFactory();
             characters = new CharacterStorage(new YamlCharacterRepository(getDataFolder().toPath()), Clock.systemUTC());
             crafting = new ManualCraftingController(characters, () -> factory.create(rules),
@@ -118,11 +145,42 @@ public final class FantasyStickPlugin extends JavaPlugin {
                 notice -> notifyPlayer(generation, notice), diagnostics, presentation, adventureSettings::enabled, gameModes);
             abilityRegistry = new games.dmg.fantasystick.ability.AbilityRegistry();
             fireball = new games.dmg.fantasystick.ability.Fireball(fireballSettings);
+            frostShardSettings = new games.dmg.fantasystick.persistence.FrostShardSettings(
+                getDataFolder().toPath(), frostShardConfiguration);
+            frostShard = new games.dmg.fantasystick.ability.FrostShard(frostShardInitial);
+            longbowSettings = new games.dmg.fantasystick.persistence.LongbowSettings(
+                getDataFolder().toPath(), longbowConfiguration);
+            longbow = new games.dmg.fantasystick.ability.Longbow(longbowInitial);
+            quickstepSettings = new games.dmg.fantasystick.persistence.QuickstepSettings(
+                getDataFolder().toPath(), quickstepConfiguration);
+            quickstep = new games.dmg.fantasystick.ability.Quickstep(quickstepInitial,
+                event -> getServer().getPluginManager().callEvent(event));
+            secondWindSettings = new games.dmg.fantasystick.persistence.SecondWindSettings(
+                getDataFolder().toPath(), secondWindConfiguration);
+            secondWind = new games.dmg.fantasystick.ability.SecondWind(secondWindInitial, characters, sessions, nextTick,
+                event -> getServer().getPluginManager().callEvent(event), games.dmg.fantasystick.session.NativeHealthLimit::read);
+            stoneSkinSettings = new games.dmg.fantasystick.persistence.StoneSkinSettings(
+                getDataFolder().toPath(), stoneSkinConfiguration);
+            combatMitigation = new games.dmg.fantasystick.ability.CombatMitigation();
+            stoneSkin = new games.dmg.fantasystick.ability.StoneSkin(stoneSkinInitial, combatMitigation);
+            shieldBashSettings = new games.dmg.fantasystick.persistence.ShieldBashSettings(
+                getDataFolder().toPath(), shieldBashConfiguration);
+            shieldBash = new games.dmg.fantasystick.ability.ShieldBash(
+                shieldBashInitial,
+                event -> getServer().getPluginManager().callEvent(event));
+            greatSword = new games.dmg.fantasystick.ability.GreatSword(greatSwordSettings);
             revivals = new games.dmg.fantasystick.persistence.RevivalStore(getDataFolder().toPath());
             revive = new games.dmg.fantasystick.ability.Revive(characters, revivals, Clock.systemUTC(), nextTick,
                 (size, title) -> getServer().createInventory(null, size, title),
                 problem -> getLogger().log(Level.WARNING, "Revive transition failed", problem));
             abilityRegistry.register(fireball.definition());
+            abilityRegistry.register(frostShard.definition());
+            abilityRegistry.register(longbow.definition());
+            abilityRegistry.register(quickstep.definition());
+            abilityRegistry.register(secondWind.definition());
+            abilityRegistry.register(stoneSkin.definition());
+            abilityRegistry.register(shieldBash.definition());
+            abilityRegistry.register(greatSword.definition());
             abilityRegistry.register(revive.definition());
             sessions.attachAbilityRegistry(abilityRegistry);
             vitals = new games.dmg.fantasystick.session.SessionVitals();
@@ -164,7 +222,10 @@ public final class FantasyStickPlugin extends JavaPlugin {
             sessionEvents.attachAbilityRegistry(abilityRegistry);
             admin = new EquipmentAdminCommand(receipts, sessions, getServer(), nextTick,
                 problem -> getLogger().log(Level.WARNING, "Equipment admin " + problem.operation()
-                    + " for player " + problem.player(), problem.cause()), adventureSettings);
+                    + " for player " + problem.player(), problem.cause()), adventureSettings,
+                frostShardSettings, frostShard, longbowSettings, longbow,
+                quickstepSettings, quickstep, secondWindSettings, secondWind,
+                stoneSkinSettings, stoneSkin, shieldBashSettings, shieldBash, abilityRegistry);
             var command = java.util.Objects.requireNonNull(getCommand("fantasystick"), "Missing packaged fantasystick command");
             command.setExecutor(admin);
             command.setTabCompleter(admin);
@@ -179,6 +240,12 @@ public final class FantasyStickPlugin extends JavaPlugin {
             getServer().getPluginManager().registerEvents(combatExperience, this);
             combatExperience.install(this);
             getServer().getPluginManager().registerEvents(fireball, this);
+            getServer().getPluginManager().registerEvents(frostShard, this);
+            getServer().getPluginManager().registerEvents(longbow, this);
+            getServer().getPluginManager().registerEvents(quickstep, this);
+            getServer().getPluginManager().registerEvents(combatMitigation, this);
+            getServer().getPluginManager().registerEvents(shieldBash, this);
+            getServer().getPluginManager().registerEvents(greatSword, this);
             getServer().getPluginManager().registerEvents(revive, this);
             getServer().getPluginManager().registerEvents(localBasicAttack, this);
             getServer().getPluginManager().registerEvents(nutritionPolicy, this);
@@ -223,6 +290,20 @@ public final class FantasyStickPlugin extends JavaPlugin {
         var closingCombatExperience = combatExperience; combatExperience = null;
         var closingAbilityEngine = abilityEngine; abilityEngine = null;
         var closingFireball = fireball; fireball = null;
+        var closingFrostShard = frostShard; frostShard = null;
+        var closingFrostSettings = frostShardSettings; frostShardSettings = null;
+        var closingLongbow = longbow; longbow = null;
+        var closingLongbowSettings = longbowSettings; longbowSettings = null;
+        var closingQuickstep = quickstep; quickstep = null;
+        var closingQuickstepSettings = quickstepSettings; quickstepSettings = null;
+        secondWind = null;
+        var closingStoneSkin = stoneSkin; stoneSkin = null;
+        var closingShieldBash = shieldBash; shieldBash = null;
+        var closingShieldBashSettings = shieldBashSettings; shieldBashSettings = null;
+        var closingCombatMitigation = combatMitigation; combatMitigation = null;
+        var closingStoneSkinSettings = stoneSkinSettings; stoneSkinSettings = null;
+        var closingSecondWindSettings = secondWindSettings; secondWindSettings = null;
+        var closingGreatSword = greatSword; greatSword = null;
         var closingRevive = revive; revive = null;
         var closingRevivals = revivals; revivals = null;
         abilityRegistry = null;
@@ -231,14 +312,39 @@ public final class FantasyStickPlugin extends JavaPlugin {
         if (closingPresentation != null) cleanup("presentation", closingPresentation::close);
         if (closingProtocol != null) cleanup("protocol presentation", closingProtocol::close);
         if (closingAdmin != null) cleanup("admin command", closingAdmin::close);
-        if (closingSettings != null) {
-            configurationDrain = closingSettings.drained();
-            cleanup("configuration", closingSettings::close);
-        }
+        if (closingSettings != null) cleanup("configuration", closingSettings::close);
+        if (closingFrostSettings != null) cleanup("Frost Shard configuration", closingFrostSettings::close);
+        if (closingLongbowSettings != null) cleanup("Longbow configuration", closingLongbowSettings::close);
+        if (closingQuickstepSettings != null) cleanup("Quickstep configuration", closingQuickstepSettings::close);
+        if (closingSecondWindSettings != null) cleanup("Second Wind configuration", closingSecondWindSettings::close);
+        if (closingStoneSkinSettings != null) cleanup("Stone Skin configuration", closingStoneSkinSettings::close);
+        if (closingShieldBashSettings != null) cleanup("Shield Bash configuration", closingShieldBashSettings::close);
+        configurationDrain = java.util.concurrent.CompletableFuture.allOf(
+            closingSettings == null ? java.util.concurrent.CompletableFuture.completedFuture(null)
+                : closingSettings.drained().toCompletableFuture(),
+            closingFrostSettings == null ? java.util.concurrent.CompletableFuture.completedFuture(null)
+                : closingFrostSettings.drained().toCompletableFuture(),
+            closingLongbowSettings == null ? java.util.concurrent.CompletableFuture.completedFuture(null)
+                : closingLongbowSettings.drained().toCompletableFuture(),
+            closingQuickstepSettings == null ? java.util.concurrent.CompletableFuture.completedFuture(null)
+                : closingQuickstepSettings.drained().toCompletableFuture(),
+            closingSecondWindSettings == null ? java.util.concurrent.CompletableFuture.completedFuture(null)
+                : closingSecondWindSettings.drained().toCompletableFuture(),
+            closingStoneSkinSettings == null ? java.util.concurrent.CompletableFuture.completedFuture(null)
+                : closingStoneSkinSettings.drained().toCompletableFuture(),
+            closingShieldBashSettings == null ? java.util.concurrent.CompletableFuture.completedFuture(null)
+                : closingShieldBashSettings.drained().toCompletableFuture());
         if (closingBooks != null) cleanup("character book", closingBooks::close);
         if (closingBasicAttack != null) cleanup("basic attack", closingBasicAttack::close);
         if (closingCombatExperience != null) cleanup("combat experience", closingCombatExperience::close);
         if (closingFireball != null) cleanup("Fireball", closingFireball::close);
+        if (closingFrostShard != null) cleanup("Frost Shard", closingFrostShard::close);
+        if (closingLongbow != null) cleanup("Longbow", closingLongbow::close);
+        if (closingQuickstep != null) cleanup("Quickstep", closingQuickstep::close);
+        if (closingStoneSkin != null) cleanup("Stone Skin", closingStoneSkin::close);
+        if (closingShieldBash != null) cleanup("Shield Bash", closingShieldBash::close);
+        if (closingCombatMitigation != null) cleanup("combat mitigation", closingCombatMitigation::close);
+        if (closingGreatSword != null) cleanup("Great Sword", closingGreatSword::close);
         if (closingRevive != null) cleanup("Revive", closingRevive::close);
         if (closingAbilityEngine != null) cleanup("ability engine", closingAbilityEngine::close);
         if (closingNutrition != null) cleanup("nutrition policy", closingNutrition::close);
@@ -255,6 +361,12 @@ public final class FantasyStickPlugin extends JavaPlugin {
         unregister(closingPartyCombat);
         unregister(closingCombatExperience);
         unregister(closingFireball);
+        unregister(closingFrostShard);
+        unregister(closingLongbow);
+        unregister(closingQuickstep);
+        unregister(closingCombatMitigation);
+        unregister(closingShieldBash);
+        unregister(closingGreatSword);
         unregister(closingRevive);
         unregister(closingBasicAttack);
         unregister(closingNutrition);
@@ -326,6 +438,77 @@ public final class FantasyStickPlugin extends JavaPlugin {
         }
     }
 
+    private java.util.Map<String, String> frostShardConfiguration() {
+        var values = new java.util.LinkedHashMap<String, String>();
+        for (String key : games.dmg.fantasystick.persistence.FrostShardSettings.keys()) {
+            values.put(key, getConfig().getString(key,
+                games.dmg.fantasystick.persistence.FrostShardSettings.defaultValue(key)));
+        }
+        games.dmg.fantasystick.persistence.FrostShardSettings.parse(values);
+        return java.util.Map.copyOf(values);
+    }
+
+    private java.util.Map<String, String> longbowConfiguration() {
+        var values = new java.util.LinkedHashMap<String, String>();
+        for (String key : games.dmg.fantasystick.persistence.LongbowSettings.keys()) {
+            values.put(key, getConfig().getString(key,
+                games.dmg.fantasystick.persistence.LongbowSettings.defaultValue(key)));
+        }
+        games.dmg.fantasystick.persistence.LongbowSettings.parse(values);
+        return java.util.Map.copyOf(values);
+    }
+
+    private java.util.Map<String, String> quickstepConfiguration() {
+        var values = new java.util.LinkedHashMap<String, String>();
+        for (String key : games.dmg.fantasystick.persistence.QuickstepSettings.keys()) {
+            values.put(key, getConfig().getString(key,
+                games.dmg.fantasystick.persistence.QuickstepSettings.defaultValue(key)));
+        }
+        games.dmg.fantasystick.persistence.QuickstepSettings.parse(values);
+        return java.util.Map.copyOf(values);
+    }
+
+    private java.util.Map<String, String> secondWindConfiguration() {
+        var values = new java.util.LinkedHashMap<String, String>();
+        for (String key : games.dmg.fantasystick.persistence.SecondWindSettings.keys()) {
+            values.put(key, getConfig().getString(key,
+                games.dmg.fantasystick.persistence.SecondWindSettings.defaultValue(key)));
+        }
+        games.dmg.fantasystick.persistence.SecondWindSettings.parse(values);
+        return java.util.Map.copyOf(values);
+    }
+
+    private java.util.Map<String, String> stoneSkinConfiguration() {
+        var values = new java.util.LinkedHashMap<String, String>();
+        for (String key : games.dmg.fantasystick.persistence.StoneSkinSettings.keys()) {
+            values.put(key, getConfig().getString(key,
+                games.dmg.fantasystick.persistence.StoneSkinSettings.defaultValue(key)));
+        }
+        games.dmg.fantasystick.persistence.StoneSkinSettings.parse(values);
+        return java.util.Map.copyOf(values);
+    }
+
+    private java.util.Map<String, String> shieldBashConfiguration() {
+        var values = new java.util.LinkedHashMap<String, String>();
+        for (String key : games.dmg.fantasystick.persistence.ShieldBashSettings.keys()) {
+            values.put(key, getConfig().getString(key,
+                games.dmg.fantasystick.persistence.ShieldBashSettings.defaultValue(key)));
+        }
+        games.dmg.fantasystick.persistence.ShieldBashSettings.parse(values);
+        return java.util.Map.copyOf(values);
+    }
+
+    private games.dmg.fantasystick.ability.GreatSword.Settings greatSwordSettings() {
+        try {
+            var base = new java.math.BigInteger(getConfig().getString("great-sword-base-damage", "7"));
+            var seconds = new java.math.BigDecimal(getConfig().getString("great-sword-recovery-seconds", "1.2"));
+            var recovery = java.time.Duration.ofNanos(seconds.movePointRight(9).toBigIntegerExact().longValueExact());
+            return new games.dmg.fantasystick.ability.GreatSword.Settings(base, recovery);
+        } catch (ArithmeticException | NumberFormatException invalid) {
+            throw new IllegalArgumentException("Great Sword settings must use supported nonnegative numeric values", invalid);
+        }
+    }
+
     private java.time.Duration switchDelay() {
         Object configured = getConfig().get("character-swap-cooldown-seconds", 900);
         String value = String.valueOf(configured);

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

@@ -17,6 +17,15 @@ public final class AbilityRegistry {
         }
     }
 
+    /** Replace one registered definition after an acknowledged runtime configuration save. */
+    public void replace(AbilityDefinition definition) {
+        Objects.requireNonNull(definition);
+        definitions.compute(definition.id(), (id, existing) -> {
+            if (existing == null) throw new IllegalArgumentException("Unknown ability ID: " + id);
+            return definition;
+        });
+    }
+
     public Optional<AbilityDefinition> find(String id) {
         return id == null ? Optional.empty() : Optional.ofNullable(definitions.get(id));
     }

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

@@ -0,0 +1,77 @@
+package games.dmg.fantasystick.ability;
+
+import java.math.BigDecimal;
+import java.util.ArrayList;
+import java.util.IdentityHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.UUID;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.entity.EntityDamageByEntityEvent;
+import org.bukkit.event.entity.EntityDamageEvent;
+
+/** Internal strongest-reduction stage shared by Fantasy Stick protection effects. */
+public final class CombatMitigation implements Listener, AutoCloseable {
+    private final class Grant implements AutoCloseable {
+        final AbilityExecution execution; final Player player; final BigDecimal percent; boolean closed;
+        Grant(AbilityExecution execution, Player player, BigDecimal percent) {
+            this.execution = execution; this.player = player; this.percent = percent;
+        }
+        @Override public void close() {
+            if (closed) return; closed = true;
+            var owned = grants.get(player.getUniqueId());
+            if (owned != null) { owned.remove(this); if (owned.isEmpty()) grants.remove(player.getUniqueId()); }
+        }
+    }
+    private record Prevention(Grant grant, BigDecimal amount) { }
+    private final Map<UUID, List<Grant>> grants = new java.util.HashMap<>();
+    private final Map<EntityDamageEvent, Prevention> pending = new IdentityHashMap<>();
+    private boolean closed;
+
+    public AutoCloseable grant(AbilityExecution execution, Player player, BigDecimal percent) {
+        Objects.requireNonNull(execution); Objects.requireNonNull(player); Objects.requireNonNull(percent);
+        if (closed || percent.signum() < 0 || percent.compareTo(BigDecimal.valueOf(100)) > 0)
+            throw new IllegalArgumentException("Invalid combat mitigation grant");
+        var grant = new Grant(execution, player, percent);
+        grants.computeIfAbsent(player.getUniqueId(), ignored -> new ArrayList<>()).add(grant);
+        return grant;
+    }
+
+    @EventHandler(priority = EventPriority.HIGH, ignoreCancelled = true)
+    public void reduce(EntityDamageByEntityEvent event) {
+        if (closed || !(event.getEntity() instanceof Player player)) return;
+        Grant strongest = null;
+        var owned = grants.get(player.getUniqueId());
+        if (owned == null) return;
+        for (var grant : List.copyOf(owned)) {
+            if (grant.closed || grant.player != player || !grant.execution.stillCurrent()) continue;
+            if (strongest == null || grant.percent.compareTo(strongest.percent) > 0) strongest = grant;
+        }
+        double original = event.getDamage();
+        if (strongest == null || !Double.isFinite(original) || original <= 0) return;
+        double reduced = BigDecimal.valueOf(original)
+            .multiply(BigDecimal.ONE.subtract(strongest.percent.movePointLeft(2))).doubleValue();
+        if (!Double.isFinite(reduced) || reduced < 0) return;
+        event.setDamage(reduced);
+        BigDecimal prevented = BigDecimal.valueOf(original - reduced);
+        if (prevented.signum() > 0) pending.put(event, new Prevention(strongest, prevented));
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void accepted(EntityDamageEvent event) {
+        var prevention = pending.remove(event);
+        if (prevention == null || event.isCancelled() || event.getFinalDamage() <= 0
+                || !prevention.grant.execution.stillCurrent()) return;
+        prevention.grant.execution.report(AbilityReport.Type.PREVENTION, event.getEntity(), prevention.amount);
+    }
+
+    @Override public void close() {
+        if (closed) return; closed = true;
+        for (var owned : List.copyOf(grants.values())) for (var grant : List.copyOf(owned)) grant.close();
+        grants.clear(); pending.clear();
+    }
+}

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

@@ -0,0 +1,233 @@
+package games.dmg.fantasystick.ability;
+
+import games.dmg.fantasystick.progression.Stat;
+import games.dmg.fantasystick.session.ControlInput;
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.time.Duration;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.UUID;
+import org.bukkit.Location;
+import org.bukkit.Material;
+import org.bukkit.Particle;
+import org.bukkit.damage.DamageSource;
+import org.bukkit.damage.DamageType;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.entity.Snowball;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.entity.EntityDamageEvent;
+import org.bukkit.event.entity.ProjectileHitEvent;
+import org.bukkit.potion.PotionEffect;
+import org.bukkit.potion.PotionEffectType;
+import org.bukkit.util.Vector;
+
+/** Frost Shard's bounded direct projectile damage and owned Slowness adapter. */
+public final class FrostShard implements AbilityEffect, Listener, AutoCloseable {
+    public record Settings(BigInteger baseDamage, Duration cooldown, double range, Duration lifetime,
+                           double speedPerTick, int slownessAmplifier, Duration slownessDuration) {
+        public Settings {
+            Objects.requireNonNull(baseDamage); Objects.requireNonNull(cooldown); Objects.requireNonNull(lifetime);
+            Objects.requireNonNull(slownessDuration);
+            if (baseDamage.signum() < 0 || cooldown.isNegative() || cooldown.compareTo(Duration.ofDays(365)) > 0
+                    || !Double.isFinite(range) || range <= 0 || range > 1024
+                    || lifetime.isZero() || lifetime.isNegative() || lifetime.compareTo(Duration.ofSeconds(60)) > 0
+                    || !Double.isFinite(speedPerTick) || speedPerTick < 0.01 || speedPerTick > 64
+                    || slownessAmplifier < 0 || slownessAmplifier > 255
+                    || slownessDuration.isZero() || slownessDuration.isNegative()
+                    || slownessDuration.compareTo(Duration.ofDays(1)) > 0) {
+                throw new IllegalArgumentException("Invalid Frost Shard settings");
+            }
+        }
+        public static Settings defaults() {
+            return new Settings(BigInteger.valueOf(4), Duration.ofSeconds(5), 32, Duration.ofSeconds(5),
+                1, 0, Duration.ofSeconds(2));
+        }
+    }
+
+    private final class State implements AutoCloseable {
+        final Snowball projectile;
+        final AbilityExecution execution;
+        final Location origin;
+        final BigInteger intelligence;
+        final Settings settings;
+        LivingEntity target;
+        boolean accepted;
+        boolean finished;
+        State(Snowball projectile, AbilityExecution execution, Location origin, BigInteger intelligence, Settings settings) {
+            this.projectile = projectile; this.execution = execution; this.origin = origin;
+            this.intelligence = intelligence; this.settings = settings;
+        }
+        @Override public void close() {
+            if (finished) return;
+            finished = true; projectiles.remove(projectile.getUniqueId(), this); projectile.remove();
+        }
+    }
+
+    private static final class SlowLease implements AutoCloseable {
+        private final LivingEntity target;
+        private final PotionEffect previous;
+        private final PotionEffect applied;
+        private final long started = System.nanoTime();
+        private boolean owned;
+        private boolean closed;
+        SlowLease(LivingEntity target, PotionEffect applied) {
+            this.target = target; this.previous = target.getPotionEffect(PotionEffectType.SLOWNESS); this.applied = applied;
+        }
+        boolean apply() { owned = target.addPotionEffect(applied); return owned; }
+        @Override public void close() {
+            if (closed) return;
+            closed = true;
+            if (!owned) return;
+            var current = target.getPotionEffect(PotionEffectType.SLOWNESS);
+            long elapsed = Math.max(0, (System.nanoTime() - started) / 50_000_000L);
+            int expected = (int) Math.max(0, (long) applied.getDuration() - elapsed);
+            if (current == null || current.getAmplifier() != applied.getAmplifier()
+                    || current.getDuration() > expected + 2) return;
+            target.removePotionEffect(PotionEffectType.SLOWNESS);
+            if (previous != null) {
+                int remaining = (int) Math.max(0, (long) previous.getDuration() - elapsed);
+                if (remaining > 0) target.addPotionEffect(previous.withDuration(remaining));
+            }
+        }
+    }
+
+    private volatile Settings settings;
+    private final Map<UUID, State> projectiles = new HashMap<>();
+    private State damaging;
+    private boolean closed;
+
+    public FrostShard(Settings settings) { this.settings = Objects.requireNonNull(settings); }
+
+    public void configure(Settings settings) { this.settings = Objects.requireNonNull(settings); }
+
+    public AbilityDefinition definition() {
+        var current = settings;
+        return new AbilityDefinition("frost_shard", "Frost Shard", Material.PRISMARINE_SHARD,
+            List.of("Launch a bounded frost projectile.",
+                "Deals " + current.baseDamage() + " + INT modifier damage and Slowness "
+                    + level(current.slownessAmplifier()) + " for " + seconds(current.slownessDuration()) + "s."),
+            "Use the equipped shard; a miss still spends the cooldown.",
+            Map.of(Stat.INT, BigInteger.valueOf(12), Stat.WIS, BigInteger.TEN), BigInteger.ONE,
+            AbilityDefinition.Activation.PROJECTILE, ControlInput.Gesture.USE, current.cooldown(),
+            Map.of("base-damage", new BigDecimal(current.baseDamage()),
+                "range", BigDecimal.valueOf(current.range()).stripTrailingZeros(),
+                "lifetime", seconds(current.lifetime()), "projectile-speed", BigDecimal.valueOf(current.speedPerTick()),
+                "slowness-amplifier", BigDecimal.valueOf(current.slownessAmplifier()),
+                "slowness-duration", seconds(current.slownessDuration())),
+            AbilityDefinition.TargetPolicy.PROJECTILE_HOSTILE, this);
+    }
+
+    public static BigInteger damage(BigInteger intelligence) {
+        return damage(BigInteger.valueOf(4), intelligence);
+    }
+
+    static BigInteger damage(BigInteger base, BigInteger intelligence) {
+        Objects.requireNonNull(base); Objects.requireNonNull(intelligence);
+        if (base.signum() < 0 || intelligence.signum() < 0) throw new IllegalArgumentException("Invalid Frost Shard damage input");
+        BigInteger delta = intelligence.subtract(BigInteger.TEN);
+        BigInteger[] divided = delta.divideAndRemainder(BigInteger.TWO);
+        BigInteger modifier = divided[0];
+        if (delta.signum() < 0 && divided[1].signum() != 0) modifier = modifier.subtract(BigInteger.ONE);
+        return base.add(modifier);
+    }
+
+    @Override public void activate(AbilityExecution execution) {
+        if (closed || !execution.stillCurrent()) return;
+        var current = settings;
+        var player = execution.input().player();
+        Location origin = player.getEyeLocation().clone();
+        Vector direction = origin.getDirection();
+        if (!Double.isFinite(direction.getX()) || !Double.isFinite(direction.getY()) || !Double.isFinite(direction.getZ())
+                || direction.lengthSquared() == 0) throw new IllegalStateException("Frost Shard direction is unavailable");
+        var projectile = player.launchProjectile(Snowball.class, direction.normalize().multiply(current.speedPerTick()));
+        var state = new State(projectile, execution, origin, execution.character().stats().get(Stat.INT), current);
+        if (projectiles.putIfAbsent(projectile.getUniqueId(), state) != null) {
+            projectile.remove(); throw new IllegalStateException("Duplicate Frost Shard projectile identity");
+        }
+        execution.own(state);
+        long rangeTicks = Math.max(1, (long) Math.ceil(current.range() / current.speedPerTick()));
+        execution.later(Duration.ofMillis(Math.multiplyExact(rangeTicks, 50)), () -> {
+            if (projectiles.containsKey(projectile.getUniqueId())) execution.finish();
+        });
+        execution.later(current.lifetime(), () -> {
+            if (projectiles.containsKey(projectile.getUniqueId())) execution.finish();
+        });
+        player.getWorld().spawnParticle(Particle.SNOWFLAKE, origin, 8, 0.15, 0.15, 0.15, 0.01);
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void hit(ProjectileHitEvent event) {
+        var state = projectiles.remove(event.getEntity().getUniqueId());
+        if (state == null) return;
+        boolean retainExecution = false;
+        try {
+            if (closed || event.isCancelled() || !state.execution.stillCurrent()
+                    || !(event.getHitEntity() instanceof LivingEntity target) || !inRange(state, event.getEntity().getLocation())
+                    || state.execution.eligible(List.of(target), 1).isEmpty()) return;
+            var current = state.settings;
+            BigInteger amount = damage(current.baseDamage(), state.intelligence);
+            double nativeDamage = amount.bitLength() > 1023 ? Double.MAX_VALUE : amount.doubleValue();
+            var source = DamageSource.builder(DamageType.FREEZE).withCausingEntity(state.execution.input().player())
+                .withDirectEntity(state.projectile).withDamageLocation(state.projectile.getLocation()).build();
+            state.target = target; damaging = state;
+            try { target.damage(nativeDamage, source); }
+            finally { if (damaging == state) damaging = null; }
+            if (state.accepted && state.execution.stillCurrent()) {
+                int ticks = Math.toIntExact(Math.max(1,
+                    (current.slownessDuration().toNanos() + 49_999_999L) / 50_000_000L));
+                var lease = new SlowLease(target, new PotionEffect(PotionEffectType.SLOWNESS, ticks,
+                    current.slownessAmplifier(), false, true, true));
+                if (lease.apply()) {
+                    state.execution.own(lease);
+                    state.execution.later(current.slownessDuration(), state.execution::finish);
+                    retainExecution = true;
+                }
+            }
+        } finally {
+            state.close();
+            if (!retainExecution) state.execution.finish();
+        }
+    }
+
+    private boolean inRange(State state, Location current) {
+        return current.getWorld() != null && state.origin.getWorld() != null
+            && current.getWorld().equals(state.origin.getWorld())
+            && current.distanceSquared(state.origin) <= state.settings.range() * state.settings.range();
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void acceptedDamage(EntityDamageEvent event) {
+        var state = damaging;
+        if (state == null || state.accepted || event.getEntity() != state.target || event.getFinalDamage() <= 0
+                || !Double.isFinite(event.getFinalDamage())) return;
+        var direct = event.getDamageSource().getDirectEntity();
+        if (direct != state.projectile && (!(event instanceof org.bukkit.event.entity.EntityDamageByEntityEvent byEntity)
+                || byEntity.getDamager() != state.projectile)) return;
+        state.accepted = true;
+        state.execution.report(AbilityReport.Type.DAMAGE, event.getEntity(), BigDecimal.valueOf(event.getFinalDamage()));
+    }
+
+    private static String level(int amplifier) {
+        return switch (amplifier + 1) {
+            case 1 -> "I"; case 2 -> "II"; case 3 -> "III"; case 4 -> "IV"; case 5 -> "V";
+            default -> Integer.toString(amplifier + 1);
+        };
+    }
+
+    private static BigDecimal seconds(Duration duration) {
+        return BigDecimal.valueOf(duration.getSeconds()).add(BigDecimal.valueOf(duration.getNano(), 9))
+            .stripTrailingZeros();
+    }
+
+    @Override public void close() {
+        if (closed) return;
+        closed = true;
+        for (var state : List.copyOf(projectiles.values())) state.execution.finish();
+        projectiles.clear(); damaging = null;
+    }
+}

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

@@ -0,0 +1,116 @@
+package games.dmg.fantasystick.ability;
+
+import games.dmg.fantasystick.progression.Stat;
+import games.dmg.fantasystick.session.ControlInput;
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.time.Duration;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import org.bukkit.Material;
+import org.bukkit.damage.DamageSource;
+import org.bukkit.damage.DamageType;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.entity.EntityDamageByEntityEvent;
+
+/** Great Sword's charge-scaled direct melee damage, replacing the contained native weapon hit. */
+public final class GreatSword implements AbilityEffect, Listener, AutoCloseable {
+    public record Settings(BigInteger baseDamage, Duration recovery) {
+        public Settings {
+            Objects.requireNonNull(baseDamage); Objects.requireNonNull(recovery);
+            if (baseDamage.signum() < 0 || recovery.isNegative()
+                    || recovery.compareTo(Duration.ofDays(365)) > 0) {
+                throw new IllegalArgumentException("Invalid Great Sword settings");
+            }
+        }
+        public static Settings defaults() { return new Settings(BigInteger.valueOf(7), Duration.ofMillis(1200)); }
+    }
+
+    private static final class Attempt {
+        final AbilityExecution execution;
+        final LivingEntity target;
+        boolean reported;
+        Attempt(AbilityExecution execution, LivingEntity target) {
+            this.execution = execution; this.target = target;
+        }
+    }
+
+    private final Settings settings;
+    private Attempt damaging;
+    private boolean closed;
+
+    public GreatSword(Settings settings) { this.settings = Objects.requireNonNull(settings); }
+
+    public AbilityDefinition definition() {
+        return new AbilityDefinition("great_sword", "Great Sword", Material.WOODEN_SWORD,
+            List.of("Charge a contained melee strike.",
+                "Fully charged: " + settings.baseDamage() + " + STR modifier damage."),
+            "Attack with the equipped sword; partial charge follows the native attack curve.",
+            Map.of(Stat.STR, BigInteger.valueOf(12)), BigInteger.ONE,
+            AbilityDefinition.Activation.IMMEDIATE, ControlInput.Gesture.ATTACK, settings.recovery(),
+            Map.of("base-damage", new BigDecimal(settings.baseDamage())),
+            AbilityDefinition.TargetPolicy.HOSTILE, this);
+    }
+
+    public static BigDecimal damage(BigInteger strength, float charge) {
+        return damage(BigInteger.valueOf(7), strength, charge);
+    }
+
+    static BigDecimal damage(BigInteger base, BigInteger strength, float charge) {
+        Objects.requireNonNull(base); Objects.requireNonNull(strength);
+        if (base.signum() < 0 || strength.signum() < 0 || !Float.isFinite(charge) || charge < 0 || charge > 1) {
+            throw new IllegalArgumentException("Invalid Great Sword damage input");
+        }
+        BigInteger delta = strength.subtract(BigInteger.TEN);
+        BigInteger[] divided = delta.divideAndRemainder(BigInteger.TWO);
+        BigInteger modifier = divided[0];
+        if (delta.signum() < 0 && divided[1].signum() != 0) modifier = modifier.subtract(BigInteger.ONE);
+        BigDecimal full = new BigDecimal(base.add(modifier));
+        BigDecimal nativeCharge = new BigDecimal(Float.toString(charge));
+        BigDecimal curve = new BigDecimal("0.2").add(new BigDecimal("0.8").multiply(nativeCharge.multiply(nativeCharge)));
+        return full.multiply(curve).stripTrailingZeros();
+    }
+
+    @Override public boolean accepts(ControlInput input) {
+        return !closed && input.target() instanceof LivingEntity;
+    }
+
+    @Override public void activate(AbilityExecution execution) {
+        if (closed || !execution.stillCurrent() || !(execution.input().target() instanceof LivingEntity target)) return;
+        BigDecimal amount = damage(settings.baseDamage(), execution.character().stats().get(Stat.STR),
+            execution.input().attackStrength());
+        double nativeDamage = amount.compareTo(BigDecimal.valueOf(Double.MAX_VALUE)) > 0
+            ? Double.MAX_VALUE : amount.doubleValue();
+        if (!Double.isFinite(nativeDamage) || nativeDamage <= 0) {
+            throw new IllegalStateException("Great Sword damage is outside the native finite range");
+        }
+        var player = execution.input().player();
+        var source = DamageSource.builder(DamageType.PLAYER_ATTACK).withCausingEntity(player)
+            .withDirectEntity(player).build();
+        var attempt = new Attempt(execution, target);
+        damaging = attempt;
+        try { target.damage(nativeDamage, source); }
+        finally { if (damaging == attempt) damaging = null; }
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void acceptedDamage(EntityDamageByEntityEvent event) {
+        var attempt = damaging;
+        if (closed || attempt == null || attempt.reported || event.isCancelled()
+                || event.getDamager() != attempt.execution.input().player() || event.getEntity() != attempt.target
+                || (event.getDamageSource().getCausingEntity() != null
+                    && event.getDamageSource().getCausingEntity() != attempt.execution.input().player())
+                || (event.getDamageSource().getDirectEntity() != null
+                    && event.getDamageSource().getDirectEntity() != attempt.execution.input().player())
+                || event.getFinalDamage() <= 0 || !Double.isFinite(event.getFinalDamage())) return;
+        attempt.reported = true;
+        attempt.execution.report(AbilityReport.Type.DAMAGE, event.getEntity(),
+            BigDecimal.valueOf(event.getFinalDamage()).stripTrailingZeros());
+    }
+
+    @Override public void close() { closed = true; damaging = null; }
+}

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

@@ -0,0 +1,220 @@
+package games.dmg.fantasystick.ability;
+
+import games.dmg.fantasystick.progression.Stat;
+import games.dmg.fantasystick.session.ControlInput;
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.math.MathContext;
+import java.time.Duration;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.UUID;
+import org.bukkit.Location;
+import org.bukkit.Material;
+import org.bukkit.damage.DamageSource;
+import org.bukkit.damage.DamageType;
+import org.bukkit.entity.AbstractArrow;
+import org.bukkit.entity.Arrow;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.entity.EntityDamageByEntityEvent;
+import org.bukkit.event.entity.EntityDamageEvent;
+import org.bukkit.event.entity.ProjectileHitEvent;
+import org.bukkit.util.Vector;
+
+/** Longbow's ammunition-free native draw and bounded custom-arrow damage adapter. */
+public final class Longbow implements AbilityEffect, Listener, AutoCloseable {
+    private static final BigInteger MAX_NATIVE_BASE = BigDecimal.valueOf(Double.MAX_VALUE).toBigInteger();
+
+    public record Settings(BigInteger baseDamage, Duration recovery, int minimumDrawTicks, int fullDrawTicks,
+                           double range, Duration lifetime, double fullSpeedPerTick) {
+        public Settings {
+            Objects.requireNonNull(baseDamage); Objects.requireNonNull(recovery); Objects.requireNonNull(lifetime);
+            if (baseDamage.signum() < 0 || baseDamage.compareTo(MAX_NATIVE_BASE) > 0
+                    || recovery.compareTo(Duration.ofSeconds(1)) < 0
+                    || recovery.compareTo(Duration.ofDays(365)) > 0
+                    || minimumDrawTicks < 1 || minimumDrawTicks > 72_000
+                    || fullDrawTicks < minimumDrawTicks || fullDrawTicks > 72_000
+                    || !Double.isFinite(range) || range <= 0 || range > 1024
+                    || lifetime.isZero() || lifetime.isNegative() || lifetime.compareTo(Duration.ofSeconds(60)) > 0
+                    || !Double.isFinite(fullSpeedPerTick) || fullSpeedPerTick < 0.01 || fullSpeedPerTick > 64) {
+                throw new IllegalArgumentException("Invalid Longbow settings");
+            }
+        }
+        public static Settings defaults() {
+            return new Settings(BigInteger.valueOf(5), Duration.ofSeconds(1), 3, 20, 64,
+                Duration.ofSeconds(10), 3);
+        }
+    }
+
+    private final class State implements AutoCloseable {
+        final Arrow arrow;
+        final AbilityExecution execution;
+        final Location origin;
+        final Settings settings;
+        final BigDecimal damage;
+        LivingEntity target;
+        boolean accepted;
+        boolean finished;
+        State(Arrow arrow, AbilityExecution execution, Location origin, Settings settings, BigDecimal damage) {
+            this.arrow = arrow; this.execution = execution; this.origin = origin; this.settings = settings; this.damage = damage;
+        }
+        @Override public void close() {
+            if (finished) return;
+            finished = true; arrows.remove(arrow.getUniqueId(), this); arrow.remove();
+        }
+    }
+
+    private volatile Settings settings;
+    private final Map<UUID, State> arrows = new HashMap<>();
+    private State damaging;
+    private boolean closed;
+
+    public Longbow(Settings settings) { this.settings = Objects.requireNonNull(settings); }
+    public void configure(Settings settings) { this.settings = Objects.requireNonNull(settings); }
+
+    public AbilityDefinition definition() {
+        var current = settings;
+        return new AbilityDefinition("longbow", "Longbow", Material.BOW,
+            List.of("Draw and release an ammunition-free owned arrow.",
+                "A full draw deals " + current.baseDamage() + " + DEX modifier damage."),
+            "Draw by holding use; release after at least " + current.minimumDrawTicks() + " ticks.",
+            Map.of(Stat.DEX, BigInteger.valueOf(14)), BigInteger.ONE,
+            AbilityDefinition.Activation.PROJECTILE, ControlInput.Gesture.DRAW_RELEASE, current.recovery(),
+            Map.of("base-damage", new BigDecimal(current.baseDamage()),
+                "minimum-draw-ticks", BigDecimal.valueOf(current.minimumDrawTicks()),
+                "full-draw-ticks", BigDecimal.valueOf(current.fullDrawTicks()),
+                "range", BigDecimal.valueOf(current.range()).stripTrailingZeros(),
+                "lifetime", seconds(current.lifetime()),
+                "full-projectile-speed", BigDecimal.valueOf(current.fullSpeedPerTick()).stripTrailingZeros()),
+            AbilityDefinition.TargetPolicy.PROJECTILE_HOSTILE, this);
+    }
+
+    @Override public boolean accepts(ControlInput input) {
+        return input.gesture() == ControlInput.Gesture.DRAW_RELEASE && input.heldTicks() >= settings.minimumDrawTicks();
+    }
+
+    public static BigDecimal power(int heldTicks, int fullDrawTicks) {
+        if (heldTicks < 0 || fullDrawTicks < 1) throw new IllegalArgumentException("Invalid Longbow draw");
+        var x = BigDecimal.valueOf(heldTicks).divide(BigDecimal.valueOf(fullDrawTicks), MathContext.DECIMAL128);
+        var power = x.multiply(x, MathContext.DECIMAL128).add(x.multiply(BigDecimal.TWO), MathContext.DECIMAL128)
+            .divide(BigDecimal.valueOf(3), MathContext.DECIMAL128);
+        return power.min(BigDecimal.ONE);
+    }
+
+    public static BigInteger fullDamage(BigInteger dexterity) {
+        return fullDamage(BigInteger.valueOf(5), dexterity);
+    }
+
+    static BigInteger fullDamage(BigInteger base, BigInteger dexterity) {
+        Objects.requireNonNull(base); Objects.requireNonNull(dexterity);
+        if (base.signum() < 0 || dexterity.signum() < 0) throw new IllegalArgumentException("Invalid Longbow damage input");
+        BigInteger delta = dexterity.subtract(BigInteger.TEN);
+        BigInteger[] divided = delta.divideAndRemainder(BigInteger.TWO);
+        BigInteger modifier = divided[0];
+        if (delta.signum() < 0 && divided[1].signum() != 0) modifier = modifier.subtract(BigInteger.ONE);
+        return base.add(modifier);
+    }
+
+    @Override public void activate(AbilityExecution execution) {
+        if (closed || !execution.stillCurrent()) return;
+        Settings shot = from(execution.definition());
+        BigDecimal power = power(execution.input().heldTicks(), shot.fullDrawTicks());
+        var player = execution.input().player();
+        Location origin = player.getEyeLocation().clone();
+        Vector direction = origin.getDirection();
+        if (!Double.isFinite(direction.getX()) || !Double.isFinite(direction.getY()) || !Double.isFinite(direction.getZ())
+                || direction.lengthSquared() == 0) throw new IllegalStateException("Longbow direction is unavailable");
+        double speed = BigDecimal.valueOf(shot.fullSpeedPerTick()).multiply(power, MathContext.DECIMAL128).doubleValue();
+        var arrow = player.launchProjectile(Arrow.class, direction.normalize().multiply(speed));
+        arrow.setPickupStatus(AbstractArrow.PickupStatus.DISALLOWED);
+        arrow.setDamage(0); arrow.setKnockbackStrength(0); arrow.setPierceLevel(0); arrow.setCritical(false);
+        var damage = new BigDecimal(fullDamage(shot.baseDamage(), execution.character().stats().get(Stat.DEX)))
+            .multiply(power, MathContext.DECIMAL128);
+        var state = new State(arrow, execution, origin, shot, damage);
+        if (arrows.putIfAbsent(arrow.getUniqueId(), state) != null) {
+            arrow.remove(); throw new IllegalStateException("Duplicate Longbow arrow identity");
+        }
+        execution.own(state);
+        long rangeTicks = Math.max(1, (long) Math.ceil(shot.range() / speed));
+        execution.later(Duration.ofMillis(Math.multiplyExact(rangeTicks, 50)), () -> {
+            if (arrows.containsKey(arrow.getUniqueId())) execution.finish();
+        });
+        execution.later(shot.lifetime(), () -> {
+            if (arrows.containsKey(arrow.getUniqueId())) execution.finish();
+        });
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST)
+    public void containNativeDamage(EntityDamageByEntityEvent event) {
+        if (!(event.getDamager() instanceof Arrow arrow)) return;
+        var state = arrows.get(arrow.getUniqueId());
+        if (state != null && damaging != state) event.setCancelled(true);
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR)
+    public void hit(ProjectileHitEvent event) {
+        var state = arrows.remove(event.getEntity().getUniqueId());
+        if (state == null) return;
+        try {
+            if (closed || event.isCancelled() || !state.execution.stillCurrent()
+                    || !(event.getHitEntity() instanceof LivingEntity target)
+                    || !inRange(state, event.getEntity().getLocation())
+                    || state.execution.eligible(List.of(target), 1).isEmpty()) return;
+            double nativeDamage = state.damage.compareTo(BigDecimal.valueOf(Double.MAX_VALUE)) > 0
+                ? Double.MAX_VALUE : state.damage.doubleValue();
+            if (!Double.isFinite(nativeDamage) || nativeDamage <= 0) return;
+            var source = DamageSource.builder(DamageType.ARROW).withCausingEntity(state.execution.input().player())
+                .withDirectEntity(state.arrow).withDamageLocation(state.arrow.getLocation()).build();
+            state.target = target; damaging = state;
+            try { target.damage(nativeDamage, source); }
+            finally { if (damaging == state) damaging = null; }
+        } finally {
+            state.close(); state.execution.finish();
+        }
+    }
+
+    private static boolean inRange(State state, Location current) {
+        return current.getWorld() != null && state.origin.getWorld() != null
+            && current.getWorld().equals(state.origin.getWorld())
+            && current.distanceSquared(state.origin) <= state.settings.range() * state.settings.range();
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void acceptedDamage(EntityDamageEvent event) {
+        var state = damaging;
+        if (state == null || state.accepted || event.getEntity() != state.target || event.getFinalDamage() <= 0
+                || !Double.isFinite(event.getFinalDamage())) return;
+        var direct = event.getDamageSource().getDirectEntity();
+        if (direct != state.arrow && (!(event instanceof EntityDamageByEntityEvent byEntity)
+                || byEntity.getDamager() != state.arrow)) return;
+        state.accepted = true;
+        state.execution.report(AbilityReport.Type.DAMAGE, event.getEntity(), BigDecimal.valueOf(event.getFinalDamage()));
+    }
+
+    private static Settings from(AbilityDefinition definition) {
+        var p = definition.parameters();
+        return new Settings(p.get("base-damage").toBigIntegerExact(), definition.cooldown(),
+            p.get("minimum-draw-ticks").intValueExact(), p.get("full-draw-ticks").intValueExact(),
+            p.get("range").doubleValue(), duration(p.get("lifetime")),
+            p.get("full-projectile-speed").doubleValue());
+    }
+
+    private static Duration duration(BigDecimal seconds) {
+        return Duration.ofNanos(seconds.movePointRight(9).toBigIntegerExact().longValueExact());
+    }
+    private static BigDecimal seconds(Duration duration) {
+        return BigDecimal.valueOf(duration.getSeconds()).add(BigDecimal.valueOf(duration.getNano(), 9)).stripTrailingZeros();
+    }
+
+    @Override public void close() {
+        if (closed) return;
+        closed = true;
+        for (var state : List.copyOf(arrows.values())) state.execution.finish();
+        arrows.clear(); damaging = null;
+    }
+}

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

@@ -0,0 +1,153 @@
+package games.dmg.fantasystick.ability;
+
+import games.dmg.fantasystick.progression.Stat;
+import games.dmg.fantasystick.session.ControlInput;
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.time.Duration;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.UUID;
+import java.util.function.Consumer;
+import org.bukkit.Location;
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerMoveEvent;
+import org.bukkit.event.player.PlayerVelocityEvent;
+import org.bukkit.util.Vector;
+
+/** Quickstep's grounded, collision-respecting, owned horizontal velocity adapter. */
+public final class Quickstep implements AbilityEffect, Listener, AutoCloseable {
+    public record Settings(Duration cooldown, double distance, double speedPerTick) {
+        public Settings {
+            Objects.requireNonNull(cooldown);
+            if (cooldown.isNegative() || cooldown.compareTo(Duration.ofDays(365)) > 0
+                    || !Double.isFinite(distance) || distance <= 0 || distance > 64
+                    || !Double.isFinite(speedPerTick) || speedPerTick < 0.01 || speedPerTick > 8) {
+                throw new IllegalArgumentException("Invalid Quickstep settings");
+            }
+        }
+        public static Settings defaults() { return new Settings(Duration.ofSeconds(5), 4, 1); }
+    }
+
+    private final class State implements AutoCloseable {
+        final AbilityExecution execution;
+        final Player player;
+        final Location origin;
+        final Vector horizontal;
+        final Settings settings;
+        boolean owned = true;
+        boolean closed;
+        State(AbilityExecution execution, Player player, Location origin, Vector horizontal, Settings settings) {
+            this.execution = execution; this.player = player; this.origin = origin;
+            this.horizontal = horizontal; this.settings = settings;
+        }
+        boolean stillOwns(Vector current) {
+            var horizontalCurrent = new Vector(current.getX(), 0, current.getZ());
+            double magnitude = horizontalCurrent.length();
+            if (magnitude < 1.0e-6) return true;
+            return magnitude <= horizontal.length() * 1.05 + 1.0e-6
+                && horizontalCurrent.clone().normalize().dot(horizontal.clone().normalize()) >= 0.99;
+        }
+        @Override public void close() {
+            if (closed) return;
+            closed = true; dashes.remove(player.getUniqueId(), this);
+            if (!owned) return;
+            Vector current = player.getVelocity();
+            if (!stillOwns(current)) return;
+            player.setVelocity(new Vector(0, current.getY(), 0));
+        }
+    }
+
+    private volatile Settings settings;
+    private final Consumer<PlayerVelocityEvent> velocityEvents;
+    private final Map<UUID, State> dashes = new HashMap<>();
+    private boolean closed;
+
+    public Quickstep(Settings settings, Consumer<PlayerVelocityEvent> velocityEvents) {
+        this.settings = Objects.requireNonNull(settings); this.velocityEvents = Objects.requireNonNull(velocityEvents);
+    }
+    public void configure(Settings settings) { this.settings = Objects.requireNonNull(settings); }
+
+    public AbilityDefinition definition() {
+        var current = settings;
+        return new AbilityDefinition("quickstep", "Quickstep", Material.RABBIT_FOOT,
+            List.of("Dash forward with native horizontal movement.",
+                "Travel up to " + decimal(current.distance()) + " blocks while obstacles remain authoritative."),
+            "Use while grounded, on foot, and not flying or gliding.",
+            Map.of(Stat.DEX, BigInteger.valueOf(12)), BigInteger.ONE,
+            AbilityDefinition.Activation.DELAYED, ControlInput.Gesture.USE, current.cooldown(),
+            Map.of("distance", BigDecimal.valueOf(current.distance()).stripTrailingZeros(),
+                "speed", BigDecimal.valueOf(current.speedPerTick()).stripTrailingZeros()),
+            AbilityDefinition.TargetPolicy.SELF, this);
+    }
+
+    @Override public boolean accepts(ControlInput input) {
+        var player = input.player();
+        if (!player.isOnGround() || player.isFlying() || player.isGliding() || player.isInsideVehicle()) return false;
+        Vector direction = player.getEyeLocation().getDirection(); direction.setY(0);
+        return finite(direction) && direction.lengthSquared() > 1.0e-12;
+    }
+
+    @Override public void activate(AbilityExecution execution) {
+        if (closed || !execution.stillCurrent()) return;
+        var current = from(execution.definition());
+        var player = execution.input().player();
+        if (!accepts(execution.input())) { execution.finish(); return; }
+        Vector direction = player.getEyeLocation().getDirection(); direction.setY(0).normalize();
+        Vector before = player.getVelocity();
+        Vector horizontal = direction.multiply(current.speedPerTick());
+        var proposed = new Vector(horizontal.getX(), before.getY(), horizontal.getZ());
+        var event = new PlayerVelocityEvent(player, proposed.clone());
+        velocityEvents.accept(event);
+        if (event.isCancelled() || !finite(event.getVelocity())) { execution.finish(); return; }
+        Vector accepted = event.getVelocity().clone(); accepted.setY(before.getY());
+        Vector acceptedHorizontal = new Vector(accepted.getX(), 0, accepted.getZ());
+        if (acceptedHorizontal.lengthSquared() < 1.0e-12) { execution.finish(); return; }
+        var state = new State(execution, player, player.getLocation().clone(), acceptedHorizontal, current);
+        var previous = dashes.put(player.getUniqueId(), state);
+        if (previous != null) previous.execution.finish();
+        execution.own(state);
+        player.setVelocity(accepted);
+        long ticks = Math.max(1, (long) Math.ceil(current.distance() / acceptedHorizontal.length()));
+        execution.later(Duration.ofMillis(Math.multiplyExact(ticks + 1, 50)), execution::finish);
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void moved(PlayerMoveEvent event) {
+        var state = dashes.get(event.getPlayer().getUniqueId());
+        if (state == null || state.player != event.getPlayer()) return;
+        var to = event.getTo();
+        if (to == null || !state.execution.stillCurrent()) { state.execution.finish(); return; }
+        Vector current = state.player.getVelocity();
+        if (!state.stillOwns(current)) {
+            state.owned = false; state.execution.finish(); return;
+        }
+        double dx = to.getX() - state.origin.getX(); double dz = to.getZ() - state.origin.getZ();
+        if (dx * dx + dz * dz >= state.settings.distance() * state.settings.distance()
+                || new Vector(current.getX(), 0, current.getZ()).lengthSquared() < 1.0e-12) {
+            state.execution.finish();
+        }
+    }
+
+    private static boolean finite(Vector vector) {
+        return Double.isFinite(vector.getX()) && Double.isFinite(vector.getY()) && Double.isFinite(vector.getZ());
+    }
+    private static Settings from(AbilityDefinition definition) {
+        return new Settings(definition.cooldown(), definition.parameters().get("distance").doubleValue(),
+            definition.parameters().get("speed").doubleValue());
+    }
+    private static BigDecimal decimal(double value) { return BigDecimal.valueOf(value).stripTrailingZeros(); }
+
+    @Override public void close() {
+        if (closed) return;
+        closed = true;
+        for (var state : List.copyOf(dashes.values())) state.execution.finish();
+        dashes.clear();
+    }
+}

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

@@ -0,0 +1,115 @@
+package games.dmg.fantasystick.ability;
+
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import games.dmg.fantasystick.progression.Stat;
+import games.dmg.fantasystick.session.ControlInput;
+import games.dmg.fantasystick.session.EquipmentSessions;
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.time.Duration;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.function.Consumer;
+import java.util.function.Supplier;
+import org.bukkit.Material;
+import org.bukkit.attribute.Attribute;
+import org.bukkit.event.entity.EntityRegainHealthEvent;
+
+/** Second Wind's validated persist-before-publication self-heal. */
+public final class SecondWind implements AbilityEffect {
+    public record Settings(BigInteger baseHealing, Duration cooldown) {
+        public Settings {
+            Objects.requireNonNull(baseHealing); Objects.requireNonNull(cooldown);
+            if (baseHealing.signum() < 0 || baseHealing.compareTo(BigDecimal.valueOf(Double.MAX_VALUE).toBigInteger()) > 0
+                    || cooldown.isNegative() || cooldown.compareTo(Duration.ofDays(365)) > 0) {
+                throw new IllegalArgumentException("Invalid Second Wind settings");
+            }
+        }
+        public static Settings defaults() { return new Settings(BigInteger.valueOf(6), Duration.ofSeconds(15)); }
+    }
+
+    private final CharacterStorage characters;
+    private final EquipmentSessions sessions;
+    private final Consumer<Runnable> nextTick;
+    private final Consumer<EntityRegainHealthEvent> healingEvents;
+    private final Supplier<BigDecimal> nativeLimit;
+    private volatile Settings settings;
+
+    public SecondWind(Settings settings, CharacterStorage characters, EquipmentSessions sessions,
+                      Consumer<Runnable> nextTick, Consumer<EntityRegainHealthEvent> healingEvents,
+                      Supplier<BigDecimal> nativeLimit) {
+        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);
+    }
+    public void configure(Settings settings) { this.settings = Objects.requireNonNull(settings); }
+
+    public AbilityDefinition definition() {
+        var current = settings;
+        return new AbilityDefinition("second_wind", "Second Wind", Material.GHAST_TEAR,
+            List.of("Restore missing fantasy health.",
+                "Heals " + current.baseHealing() + " + WIS modifier, capped at maximum health."),
+            "Use while injured; full health refuses without spending cooldown.",
+            Map.of(Stat.CON, BigInteger.valueOf(12), Stat.WIS, BigInteger.valueOf(12)), BigInteger.ONE,
+            AbilityDefinition.Activation.DELAYED, ControlInput.Gesture.USE, current.cooldown(),
+            Map.of("base-healing", new BigDecimal(current.baseHealing())),
+            AbilityDefinition.TargetPolicy.SELF, this);
+    }
+
+    @Override public boolean accepts(ControlInput input) {
+        double health = input.player().getHealth();
+        var attribute = input.player().getAttribute(Attribute.MAX_HEALTH);
+        return attribute != null && Double.isFinite(health) && health >= 0
+            && Double.isFinite(attribute.getValue()) && health < attribute.getValue();
+    }
+
+    public static BigInteger healing(BigInteger wisdom) { return healing(BigInteger.valueOf(6), wisdom); }
+    static BigInteger healing(BigInteger base, BigInteger wisdom) {
+        Objects.requireNonNull(base); Objects.requireNonNull(wisdom);
+        if (base.signum() < 0 || wisdom.signum() < 0) throw new IllegalArgumentException("Invalid Second Wind healing input");
+        BigInteger delta = wisdom.subtract(BigInteger.TEN); BigInteger[] divided = delta.divideAndRemainder(BigInteger.TWO);
+        BigInteger modifier = divided[0];
+        if (delta.signum() < 0 && divided[1].signum() != 0) modifier = modifier.subtract(BigInteger.ONE);
+        return base.add(modifier);
+    }
+
+    @Override public void activate(AbilityExecution execution) {
+        if (!execution.stillCurrent()) return;
+        var definition = execution.definition();
+        BigInteger base = definition.parameters().get("base-healing").toBigIntegerExact();
+        var player = execution.input().player();
+        var attribute = player.getAttribute(Attribute.MAX_HEALTH);
+        if (attribute == null) { execution.finish(); return; }
+        double current = player.getHealth(); double maximum = attribute.getValue();
+        double missing = maximum - current;
+        if (!Double.isFinite(current) || !Double.isFinite(maximum) || missing <= 0) { execution.finish(); return; }
+        BigInteger exact = healing(base, execution.character().stats().get(Stat.WIS));
+        double proposed = exact.bitLength() > 1023 ? missing : Math.min(missing, exact.doubleValue());
+        if (!Double.isFinite(proposed) || proposed <= 0) { execution.finish(); return; }
+        var event = new EntityRegainHealthEvent(player, proposed, EntityRegainHealthEvent.RegainReason.CUSTOM);
+        healingEvents.accept(event);
+        double accepted = Math.min(missing, event.getAmount());
+        if (event.isCancelled() || !Double.isFinite(accepted) || accepted <= 0) { execution.finish(); return; }
+        var record = execution.character(); var expected = record.revision();
+        BigDecimal target = BigDecimal.valueOf(current + accepted);
+        BigDecimal limit = nativeLimit.get();
+        characters.saveHealth(record.id(), expected, target, limit).whenComplete((saved, failure) -> {
+            try {
+                nextTick.accept(() -> {
+                    try {
+                        if (failure != null || saved == null || saved.isEmpty() || !execution.stillCurrent()) {
+                            player.sendMessage("Second Wind health could not be saved; no healing was applied."); return;
+                        }
+                        var persisted = saved.orElseThrow();
+                        if (!sessions.acknowledgeProgress(execution.input().session(), expected, persisted)) {
+                            player.sendMessage("Second Wind was saved, but the session changed; no native healing was applied."); return;
+                        }
+                        double publish = Math.min(attribute.getValue(), Math.max(player.getHealth(), persisted.health().doubleValue()));
+                        player.setHealth(publish);
+                    } finally { execution.finish(); }
+                });
+            } catch (RuntimeException rejected) { execution.finish(); }
+        });
+    }
+}

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

@@ -0,0 +1,144 @@
+package games.dmg.fantasystick.ability;
+
+import games.dmg.fantasystick.progression.Stat;
+import games.dmg.fantasystick.session.ControlInput;
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.time.Duration;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.function.Consumer;
+import org.bukkit.Location;
+import org.bukkit.Material;
+import org.bukkit.damage.DamageSource;
+import org.bukkit.damage.DamageType;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.Listener;
+import org.bukkit.event.entity.EntityDamageByEntityEvent;
+import org.bukkit.event.player.PlayerVelocityEvent;
+import org.bukkit.util.Vector;
+
+/** Shield Bash's contained short-range custom strike and post-damage knockback. */
+public final class ShieldBash implements AbilityEffect, Listener, AutoCloseable {
+    public record Settings(BigInteger baseDamage, Duration cooldown, double range,
+                           double horizontalKnockback, double minimumVerticalKnockback) {
+        public Settings {
+            Objects.requireNonNull(baseDamage); Objects.requireNonNull(cooldown);
+            if (baseDamage.signum() < 0 || cooldown.isNegative() || cooldown.compareTo(Duration.ofDays(365)) > 0
+                    || !Double.isFinite(range) || range <= 0 || range > 64
+                    || !Double.isFinite(horizontalKnockback) || horizontalKnockback < 0 || horizontalKnockback > 8
+                    || !Double.isFinite(minimumVerticalKnockback) || minimumVerticalKnockback < 0
+                    || minimumVerticalKnockback > 8) throw new IllegalArgumentException("Invalid Shield Bash settings");
+        }
+        public static Settings defaults() {
+            return new Settings(BigInteger.valueOf(4), Duration.ofSeconds(6), 3, 0.8, 0.35);
+        }
+    }
+    private static final class Attempt {
+        final AbilityExecution execution; final LivingEntity target; final Settings settings; boolean accepted;
+        Attempt(AbilityExecution execution, LivingEntity target, Settings settings) {
+            this.execution = execution; this.target = target; this.settings = settings;
+        }
+    }
+
+    private volatile Settings settings;
+    private final Consumer<PlayerVelocityEvent> velocityEvents;
+    private Attempt damaging;
+    private boolean closed;
+
+    public ShieldBash(Settings settings, Consumer<PlayerVelocityEvent> velocityEvents) {
+        this.settings = Objects.requireNonNull(settings); this.velocityEvents = Objects.requireNonNull(velocityEvents);
+    }
+    public void configure(Settings settings) { this.settings = Objects.requireNonNull(settings); }
+
+    public AbilityDefinition definition() {
+        var current = settings;
+        return new AbilityDefinition("shield_bash", "Shield Bash", Material.SHIELD,
+            List.of("Strike within " + decimal(current.range()) + " blocks for " + current.baseDamage() + " + STR modifier damage.",
+                "Accepted damage adds knockback; this shield never enables ordinary blocking."),
+            "Attack a visible hostile at short range.", Map.of(Stat.STR, BigInteger.valueOf(12), Stat.CON, BigInteger.valueOf(12)),
+            BigInteger.ONE, AbilityDefinition.Activation.DELAYED, ControlInput.Gesture.ATTACK, current.cooldown(),
+            Map.of("base-damage", new BigDecimal(current.baseDamage()), "range", decimalValue(current.range()),
+                "horizontal-knockback", decimalValue(current.horizontalKnockback()),
+                "minimum-vertical-knockback", decimalValue(current.minimumVerticalKnockback())),
+            AbilityDefinition.TargetPolicy.HOSTILE, this);
+    }
+
+    @Override public boolean accepts(ControlInput input) {
+        return !closed && input.target() instanceof LivingEntity target && inRange(input.player(), target, settings.range());
+    }
+
+    public static BigInteger damage(BigInteger strength) { return damage(BigInteger.valueOf(4), strength); }
+    static BigInteger damage(BigInteger base, BigInteger strength) {
+        Objects.requireNonNull(base); Objects.requireNonNull(strength);
+        if (base.signum() < 0 || strength.signum() < 0) throw new IllegalArgumentException("Invalid Shield Bash damage input");
+        var delta = strength.subtract(BigInteger.TEN); var divided = delta.divideAndRemainder(BigInteger.TWO);
+        var modifier = divided[0];
+        if (delta.signum() < 0 && divided[1].signum() != 0) modifier = modifier.subtract(BigInteger.ONE);
+        return base.add(modifier);
+    }
+
+    @Override public void activate(AbilityExecution execution) {
+        if (closed || !execution.stillCurrent() || !(execution.input().target() instanceof LivingEntity target)) return;
+        var current = from(execution.definition()); var player = execution.input().player();
+        if (!inRange(player, target, current.range())) { execution.finish(); return; }
+        var exact = damage(current.baseDamage(), execution.character().stats().get(Stat.STR));
+        double amount = exact.bitLength() > 1023 ? Double.MAX_VALUE : exact.doubleValue();
+        if (!Double.isFinite(amount) || amount <= 0) { execution.finish(); return; }
+        var source = DamageSource.builder(DamageType.PLAYER_ATTACK).withCausingEntity(player).withDirectEntity(player).build();
+        var attempt = new Attempt(execution, target, current); damaging = attempt;
+        try { target.damage(amount, source); }
+        finally { if (damaging == attempt) damaging = null; execution.finish(); }
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void acceptedDamage(EntityDamageByEntityEvent event) {
+        var attempt = damaging;
+        if (closed || attempt == null || attempt.accepted || event.isCancelled() || event.getFinalDamage() <= 0
+                || !Double.isFinite(event.getFinalDamage()) || event.getDamager() != attempt.execution.input().player()
+                || event.getEntity() != attempt.target || !attempt.execution.stillCurrent()) return;
+        attempt.accepted = true;
+        attempt.execution.report(AbilityReport.Type.DAMAGE, event.getEntity(),
+            BigDecimal.valueOf(event.getFinalDamage()).stripTrailingZeros());
+        knockback(attempt);
+    }
+
+    private void knockback(Attempt attempt) {
+        var player = attempt.execution.input().player(); var target = attempt.target;
+        Vector away = target.getLocation().toVector().subtract(player.getLocation().toVector()); away.setY(0);
+        if (!finite(away) || away.lengthSquared() < 1.0e-12) return;
+        Vector current = target.getVelocity();
+        Vector proposed = current.clone().add(away.normalize().multiply(attempt.settings.horizontalKnockback()));
+        proposed.setY(Math.max(current.getY(), attempt.settings.minimumVerticalKnockback()));
+        if (!finite(proposed)) return;
+        if (target instanceof Player targetPlayer) {
+            var event = new PlayerVelocityEvent(targetPlayer, proposed.clone()); velocityEvents.accept(event);
+            if (event.isCancelled() || !finite(event.getVelocity())) return;
+            proposed = event.getVelocity().clone();
+        }
+        target.setVelocity(proposed);
+    }
+
+    private static boolean inRange(Player player, LivingEntity target, double range) {
+        try {
+            Location source = player.getLocation(); Location destination = target.getLocation();
+            return source.getWorld() == destination.getWorld() && source.distanceSquared(destination) <= range * range
+                && player.hasLineOfSight(target);
+        } catch (RuntimeException invalid) { return false; }
+    }
+    private static boolean finite(Vector value) {
+        return Double.isFinite(value.getX()) && Double.isFinite(value.getY()) && Double.isFinite(value.getZ());
+    }
+    private static Settings from(AbilityDefinition definition) {
+        var p = definition.parameters();
+        return new Settings(p.get("base-damage").toBigIntegerExact(), definition.cooldown(), p.get("range").doubleValue(),
+            p.get("horizontal-knockback").doubleValue(), p.get("minimum-vertical-knockback").doubleValue());
+    }
+    private static BigDecimal decimalValue(double value) { return BigDecimal.valueOf(value).stripTrailingZeros(); }
+    private static String decimal(double value) { return decimalValue(value).toPlainString(); }
+    @Override public void close() { closed = true; damaging = null; }
+}

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

@@ -0,0 +1,84 @@
+package games.dmg.fantasystick.ability;
+
+import games.dmg.fantasystick.progression.Stat;
+import games.dmg.fantasystick.session.ControlInput;
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.time.Duration;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.UUID;
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+
+/** Stone Skin's captured, owned grant into the shared strongest-reduction stage. */
+public final class StoneSkin implements AbilityEffect, AutoCloseable {
+    public record Settings(Duration cooldown, Duration duration, BigDecimal reductionPercent) {
+        public Settings {
+            Objects.requireNonNull(cooldown); Objects.requireNonNull(duration); Objects.requireNonNull(reductionPercent);
+            if (cooldown.isNegative() || cooldown.compareTo(Duration.ofDays(365)) > 0
+                    || duration.isNegative() || duration.isZero() || duration.compareTo(Duration.ofDays(1)) > 0
+                    || reductionPercent.signum() < 0 || reductionPercent.compareTo(BigDecimal.valueOf(100)) > 0)
+                throw new IllegalArgumentException("Invalid Stone Skin settings");
+        }
+        public static Settings defaults() {
+            return new Settings(Duration.ofSeconds(14), Duration.ofSeconds(4), BigDecimal.valueOf(25));
+        }
+    }
+
+    private final class State implements AutoCloseable {
+        final AbilityExecution execution; final Player player; final AutoCloseable grant; boolean closed;
+        State(AbilityExecution execution, Player player, AutoCloseable grant) {
+            this.execution = execution; this.player = player; this.grant = grant;
+        }
+        @Override public void close() {
+            if (closed) return; closed = true; protections.remove(player.getUniqueId(), this);
+            try { grant.close(); } catch (Exception impossible) { throw new IllegalStateException(impossible); }
+        }
+    }
+
+    private volatile Settings settings;
+    private final CombatMitigation mitigation;
+    private final Map<UUID, State> protections = new java.util.HashMap<>();
+    private boolean closed;
+
+    public StoneSkin(Settings settings, CombatMitigation mitigation) {
+        this.settings = Objects.requireNonNull(settings); this.mitigation = Objects.requireNonNull(mitigation);
+    }
+    public void configure(Settings settings) { this.settings = Objects.requireNonNull(settings); }
+
+    public AbilityDefinition definition() {
+        var current = settings;
+        return new AbilityDefinition("stone_skin", "Stone Skin", Material.BRICK,
+            List.of("Reduce entity and projectile combat damage by " + decimal(current.reductionPercent()) + "%.",
+                "Lasts " + decimal(BigDecimal.valueOf(current.duration().toMillis()).movePointLeft(3)) + " seconds without stacking."),
+            "Use to protect yourself; environmental damage is unchanged.", Map.of(Stat.CON, BigInteger.valueOf(14)), BigInteger.ONE,
+            AbilityDefinition.Activation.DELAYED, ControlInput.Gesture.USE, current.cooldown(),
+            Map.of("duration-seconds", BigDecimal.valueOf(current.duration().toNanos()).movePointLeft(9),
+                "damage-reduction-percent", current.reductionPercent()), AbilityDefinition.TargetPolicy.SELF, this);
+    }
+
+    @Override public void activate(AbilityExecution execution) {
+        if (closed || !execution.stillCurrent()) return;
+        var current = from(execution.definition()); var player = execution.input().player();
+        var grant = mitigation.grant(execution, player, current.reductionPercent());
+        var state = new State(execution, player, grant);
+        var previous = protections.put(player.getUniqueId(), state);
+        if (previous != null) previous.execution.finish();
+        execution.own(state); execution.later(current.duration(), execution::finish);
+    }
+
+    private static Settings from(AbilityDefinition definition) {
+        return new Settings(definition.cooldown(),
+            Duration.ofNanos(definition.parameters().get("duration-seconds").movePointRight(9).longValueExact()),
+            definition.parameters().get("damage-reduction-percent"));
+    }
+    private static String decimal(BigDecimal value) { return value.stripTrailingZeros().toPlainString(); }
+
+    @Override public void close() {
+        if (closed) return; closed = true;
+        for (var state : List.copyOf(protections.values())) state.execution.finish();
+        protections.clear();
+    }
+}

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

@@ -174,7 +174,7 @@ public final class CharacterBookController implements Consumer<ControlInput>, Au
         String text = definition.name() + "\nIcon: " + definition.icon().name()
             + "\n\n" + String.join("\n", definition.lore()) + "\n\n" + definition.instructions()
             + "\nRequires: " + requirements + "\nCost: " + definition.pointCost()
-            + "\nCooldown: " + definition.cooldown().toSeconds() + "s" + parameters + "\n\n" + state;
+            + "\nCooldown: " + durationSeconds(definition.cooldown()) + "s" + parameters + "\n\n" + state;
         var pages = new java.util.ArrayList<>(BookPagination.pages(text));
         if (!learned && stats && record.unspentPoints().compareTo(definition.pointCost()) >= 0) {
             pages.add(Component.text("Ability action\n\n").append(abilityButton("Learn", ABILITY_UNLOCK, view, definition.id(), null)));
@@ -191,6 +191,11 @@ public final class CharacterBookController implements Consumer<ControlInput>, Au
         return java.util.List.copyOf(pages);
     }
 
+    private static String durationSeconds(java.time.Duration duration) {
+        return java.math.BigDecimal.valueOf(duration.getSeconds())
+            .add(java.math.BigDecimal.valueOf(duration.getNano(), 9)).stripTrailingZeros().toPlainString();
+    }
+
     private static Component abilityButton(String label, net.kyori.adventure.key.Key action, AbilityView view,
                                            String ability, Integer slot) {
         String payload = "\"" + view.nonce() + ":" + ability + (slot == null ? "" : ":" + slot) + "\"";

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

@@ -441,12 +441,19 @@ public final class CharacterStorage implements AutoCloseable {
     /** Session-owned remaining health; retain all other current fields and reject concurrent revision changes. */
     public CompletableFuture<Optional<CharacterRecord>> saveHealth(UUID characterId, java.math.BigDecimal health,
                                                                   java.math.BigDecimal nativeLimit) {
+        return saveHealth(characterId, null, health, nativeLimit);
+    }
+
+    /** Ability-owned health mutation that refuses a changed character revision rather than healing stale state. */
+    public CompletableFuture<Optional<CharacterRecord>> saveHealth(UUID characterId, BigInteger expectedRevision,
+            java.math.BigDecimal health, java.math.BigDecimal nativeLimit) {
         Objects.requireNonNull(characterId);
         if (health.signum() < 0 || nativeLimit.signum() <= 0) throw new IllegalArgumentException("Invalid health bound");
         return submit(() -> {
             var found = repository.load(characterId);
             if (found.isEmpty() || found.orElseThrow().dead()) return Optional.empty();
             var old = found.orElseThrow();
+            if (expectedRevision != null && !old.revision().equals(expectedRevision)) return Optional.empty();
             var bounded = health.min(old.maximumHealth()).min(nativeLimit);
             if (old.health().compareTo(bounded) == 0) return Optional.of(old);
             var saved = new CharacterRecord(old.id(), old.name(), old.revision().add(BigInteger.ONE), old.stats(), old.level(),

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

@@ -0,0 +1,198 @@
+package games.dmg.fantasystick.persistence;
+
+import games.dmg.fantasystick.ability.FrostShard;
+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.time.Duration;
+import java.util.LinkedHashMap;
+import java.util.List;
+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;
+
+/** Serialized durable Frost Shard settings; publication remains a server-thread caller decision. */
+public final class FrostShardSettings implements AutoCloseable {
+    private static final int MAX_BYTES = 1_048_576;
+    public static final String BASE_DAMAGE = "frost-shard-base-damage";
+    public static final String COOLDOWN = "frost-shard-cooldown-seconds";
+    public static final String RANGE = "frost-shard-range-blocks";
+    public static final String LIFETIME = "frost-shard-lifetime-seconds";
+    public static final String SPEED = "frost-shard-projectile-speed-blocks-per-tick";
+    public static final String AMPLIFIER = "frost-shard-slowness-amplifier";
+    public static final String SLOWNESS = "frost-shard-slowness-duration-seconds";
+    private static final List<String> KEYS = List.of(BASE_DAMAGE, COOLDOWN, LIFETIME, SPEED, RANGE, AMPLIFIER, SLOWNESS);
+    private static final Map<String, String> DEFAULTS = Map.of(BASE_DAMAGE, "4", COOLDOWN, "5", RANGE, "32",
+        LIFETIME, "5", SPEED, "1", AMPLIFIER, "0", SLOWNESS, "2");
+
+    @FunctionalInterface interface Replacement { void move(Path from, Path to) throws IOException; }
+    public record Update(String key, String value, FrostShard.Settings settings,
+                         Map<String, String> values, long sequence) {
+        public Update { values = Map.copyOf(values); }
+    }
+
+    private final Path directory;
+    private final Replacement replacement;
+    private final java.util.concurrent.ExecutorService worker = Executors.newSingleThreadExecutor(
+        task -> new Thread(task, "fantasy-frost-shard-configuration"));
+    private volatile Map<String, String> effectiveValues;
+    private Map<String, String> persistedValues;
+    private long persistedSequence;
+    private long publishedSequence;
+    private boolean closed;
+    private int pending;
+    private final CompletableFuture<Void> drained = new CompletableFuture<>();
+
+    public FrostShardSettings(Path directory, Map<String, String> initial) {
+        this(directory, initial, (from, to) -> Files.move(from, to,
+            StandardCopyOption.ATOMIC_MOVE, StandardCopyOption.REPLACE_EXISTING));
+    }
+
+    FrostShardSettings(Path directory, Map<String, String> initial, Replacement replacement) {
+        this.directory = Objects.requireNonNull(directory).toAbsolutePath();
+        this.replacement = Objects.requireNonNull(replacement);
+        var copy = new LinkedHashMap<String, String>();
+        for (String key : KEYS) copy.put(key, Objects.requireNonNull(initial.get(key)));
+        parse(copy);
+        effectiveValues = Map.copyOf(copy); persistedValues = Map.copyOf(copy);
+    }
+
+    public static List<String> keys() { return KEYS; }
+    public static String defaultValue(String key) { return DEFAULTS.get(key); }
+    public String value(String key) { return effectiveValues.get(key); }
+    public FrostShard.Settings settings() { return parse(effectiveValues); }
+
+    /** Publish only after the caller returns the durable acknowledgment to the server thread. */
+    public synchronized void publish(Update update) {
+        Objects.requireNonNull(update);
+        if (update.sequence() <= publishedSequence) return;
+        parse(update.values());
+        effectiveValues = update.values(); publishedSequence = update.sequence();
+    }
+
+    public CompletionStage<Update> set(String key, String value) {
+        Objects.requireNonNull(key); Objects.requireNonNull(value);
+        if (!KEYS.contains(key)) return CompletableFuture.failedStage(new IllegalArgumentException("Unknown setting"));
+        String accepted = canonical(key, value);
+        var preview = new LinkedHashMap<>(effectiveValues); preview.put(key, accepted);
+        parse(preview); // Fail malformed/out-of-range command input before queueing accepted persistence.
+        synchronized (this) {
+            if (closed) return CompletableFuture.failedStage(new IOException("Configuration store is closed"));
+            pending++;
+        }
+        try {
+            return CompletableFuture.supplyAsync(() -> {
+                try {
+                    var next = new LinkedHashMap<>(persistedValues);
+                    next.put(key, accepted);
+                    var parsed = parse(next);
+                    save(key, accepted);
+                    persistedValues = Map.copyOf(next);
+                    return new Update(key, accepted, parsed, persistedValues, ++persistedSequence);
+                } catch (IOException | RuntimeException failure) {
+                    throw new java.util.concurrent.CompletionException(failure instanceof IllegalArgumentException
+                        ? failure : new IOException("Frost Shard configuration save refused or failed; effective settings unchanged"));
+                } finally { finished(); }
+            }, worker).minimalCompletionStage();
+        } catch (RejectedExecutionException rejected) {
+            finished();
+            return CompletableFuture.failedStage(new IOException("Configuration store is closed"));
+        }
+    }
+
+    private static String canonical(String key, String raw) {
+        try {
+            if (key.equals(BASE_DAMAGE) || key.equals(AMPLIFIER)) return new java.math.BigInteger(raw).toString();
+            return new java.math.BigDecimal(raw).stripTrailingZeros().toPlainString();
+        } catch (NumberFormatException invalid) { throw new IllegalArgumentException("Invalid value", invalid); }
+    }
+
+    public static FrostShard.Settings parse(Map<String, String> values) {
+        try {
+            var base = new java.math.BigInteger(values.get(BASE_DAMAGE));
+            var cooldown = seconds(values.get(COOLDOWN));
+            double range = finite(values.get(RANGE));
+            var lifetime = seconds(values.get(LIFETIME));
+            double speed = finite(values.get(SPEED));
+            int amplifier = new java.math.BigInteger(values.get(AMPLIFIER)).intValueExact();
+            var slowness = seconds(values.get(SLOWNESS));
+            return new FrostShard.Settings(base, cooldown, range, lifetime, speed, amplifier, slowness);
+        } catch (ArithmeticException | NumberFormatException | NullPointerException invalid) {
+            throw new IllegalArgumentException("Frost Shard settings must use supported numeric values", invalid);
+        }
+    }
+
+    private static Duration seconds(String value) {
+        var nanos = new java.math.BigDecimal(value).movePointRight(9).toBigIntegerExact().longValueExact();
+        return Duration.ofNanos(nanos);
+    }
+
+    private static double finite(String value) {
+        double result = new java.math.BigDecimal(value).doubleValue();
+        if (!Double.isFinite(result)) throw new IllegalArgumentException("Setting is not finite");
+        return result;
+    }
+
+    private void save(String key, 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 savedKey)) throw new IOException("Invalid configuration key");
+                        document.put(savedKey, entry.getValue());
+                    }
+                }
+            }
+            document.put(key, value);
+            byte[] bytes = yaml.dump(document).getBytes(StandardCharsets.UTF_8);
+            if (bytes.length > MAX_BYTES) throw new IOException("Configuration too large");
+            Path temporary = Files.createTempFile(directory, ".config-", ".tmp");
+            try {
+                try (var output = FileChannel.open(temporary, StandardOpenOption.WRITE, LinkOption.NOFOLLOW_LINKS)) {
+                    var buffer = ByteBuffer.wrap(bytes); while (buffer.hasRemaining()) output.write(buffer); output.force(true);
+                }
+                replacement.move(temporary, file);
+            } finally { Files.deleteIfExists(temporary); }
+        } catch (OverlappingFileLockException busy) { throw new IOException("Configuration busy"); }
+    }
+
+    private synchronized void finished() {
+        pending--;
+        if (closed && pending == 0) drained.complete(null);
+    }
+    public CompletionStage<Void> drained() { return drained.minimalCompletionStage(); }
+    @Override public synchronized void close() {
+        closed = true; worker.shutdown(); if (pending == 0) drained.complete(null);
+    }
+}

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

@@ -0,0 +1,201 @@
+package games.dmg.fantasystick.persistence;
+
+import games.dmg.fantasystick.ability.Longbow;
+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.time.Duration;
+import java.util.LinkedHashMap;
+import java.util.List;
+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;
+
+/** Serialized durable Longbow settings; publication remains a server-thread caller decision. */
+public final class LongbowSettings implements AutoCloseable {
+    private static final int MAX_BYTES = 1_048_576;
+    public static final String BASE_DAMAGE = "longbow-base-damage";
+    public static final String RECOVERY = "longbow-recovery-seconds";
+    public static final String MINIMUM_DRAW = "longbow-minimum-draw-ticks";
+    public static final String FULL_DRAW = "longbow-full-draw-ticks";
+    public static final String RANGE = "longbow-range-blocks";
+    public static final String LIFETIME = "longbow-lifetime-seconds";
+    public static final String FULL_SPEED = "longbow-full-projectile-speed-blocks-per-tick";
+    private static final List<String> KEYS = List.of(BASE_DAMAGE, RECOVERY, MINIMUM_DRAW, FULL_DRAW, RANGE,
+        LIFETIME, FULL_SPEED);
+    private static final Map<String, String> DEFAULTS = Map.of(BASE_DAMAGE, "5", RECOVERY, "1",
+        MINIMUM_DRAW, "3", FULL_DRAW, "20", RANGE, "64", LIFETIME, "10", FULL_SPEED, "3");
+
+    @FunctionalInterface interface Replacement { void move(Path from, Path to) throws IOException; }
+    public record Update(String key, String value, Longbow.Settings settings,
+                         Map<String, String> values, long sequence) {
+        public Update { values = Map.copyOf(values); }
+    }
+
+    private final Path directory;
+    private final Replacement replacement;
+    private final java.util.concurrent.ExecutorService worker = Executors.newSingleThreadExecutor(
+        task -> new Thread(task, "fantasy-longbow-configuration"));
+    private volatile Map<String, String> effectiveValues;
+    private Map<String, String> persistedValues;
+    private long persistedSequence;
+    private long publishedSequence;
+    private boolean closed;
+    private int pending;
+    private final CompletableFuture<Void> drained = new CompletableFuture<>();
+
+    public LongbowSettings(Path directory, Map<String, String> initial) {
+        this(directory, initial, (from, to) -> Files.move(from, to,
+            StandardCopyOption.ATOMIC_MOVE, StandardCopyOption.REPLACE_EXISTING));
+    }
+
+    LongbowSettings(Path directory, Map<String, String> initial, Replacement replacement) {
+        this.directory = Objects.requireNonNull(directory).toAbsolutePath();
+        this.replacement = Objects.requireNonNull(replacement);
+        var copy = new LinkedHashMap<String, String>();
+        for (String key : KEYS) copy.put(key, Objects.requireNonNull(initial.get(key)));
+        parse(copy);
+        effectiveValues = Map.copyOf(copy); persistedValues = Map.copyOf(copy);
+    }
+
+    public static List<String> keys() { return KEYS; }
+    public static String defaultValue(String key) { return DEFAULTS.get(key); }
+    public String value(String key) { return effectiveValues.get(key); }
+    public Longbow.Settings settings() { return parse(effectiveValues); }
+
+    /** Publish only after the caller returns the durable acknowledgment to the server thread. */
+    public synchronized void publish(Update update) {
+        Objects.requireNonNull(update);
+        if (update.sequence() <= publishedSequence) return;
+        parse(update.values());
+        effectiveValues = update.values(); publishedSequence = update.sequence();
+    }
+
+    public CompletionStage<Update> set(String key, String value) {
+        Objects.requireNonNull(key); Objects.requireNonNull(value);
+        if (!KEYS.contains(key)) return CompletableFuture.failedStage(new IllegalArgumentException("Unknown setting"));
+        String accepted = canonical(key, value);
+        var preview = new LinkedHashMap<>(effectiveValues); preview.put(key, accepted);
+        parse(preview); // Fail malformed/out-of-range command input before queueing accepted persistence.
+        synchronized (this) {
+            if (closed) return CompletableFuture.failedStage(new IOException("Configuration store is closed"));
+            pending++;
+        }
+        try {
+            return CompletableFuture.supplyAsync(() -> {
+                try {
+                    var next = new LinkedHashMap<>(persistedValues);
+                    next.put(key, accepted);
+                    var parsed = parse(next);
+                    save(key, accepted);
+                    persistedValues = Map.copyOf(next);
+                    return new Update(key, accepted, parsed, persistedValues, ++persistedSequence);
+                } catch (IOException | RuntimeException failure) {
+                    throw new java.util.concurrent.CompletionException(failure instanceof IllegalArgumentException
+                        ? failure : new IOException("Longbow configuration save refused or failed; effective settings unchanged"));
+                } finally { finished(); }
+            }, worker).minimalCompletionStage();
+        } catch (RejectedExecutionException rejected) {
+            finished();
+            return CompletableFuture.failedStage(new IOException("Configuration store is closed"));
+        }
+    }
+
+    private static String canonical(String key, String raw) {
+        try {
+            if (key.equals(BASE_DAMAGE) || key.equals(MINIMUM_DRAW) || key.equals(FULL_DRAW)) {
+                return new java.math.BigInteger(raw).toString();
+            }
+            return new java.math.BigDecimal(raw).stripTrailingZeros().toPlainString();
+        } catch (NumberFormatException invalid) { throw new IllegalArgumentException("Invalid value", invalid); }
+    }
+
+    public static Longbow.Settings parse(Map<String, String> values) {
+        try {
+            var base = new java.math.BigInteger(values.get(BASE_DAMAGE));
+            var recovery = seconds(values.get(RECOVERY));
+            int minimumDraw = new java.math.BigInteger(values.get(MINIMUM_DRAW)).intValueExact();
+            int fullDraw = new java.math.BigInteger(values.get(FULL_DRAW)).intValueExact();
+            double range = finite(values.get(RANGE));
+            var lifetime = seconds(values.get(LIFETIME));
+            double speed = finite(values.get(FULL_SPEED));
+            return new Longbow.Settings(base, recovery, minimumDraw, fullDraw, range, lifetime, speed);
+        } catch (ArithmeticException | NumberFormatException | NullPointerException invalid) {
+            throw new IllegalArgumentException("Longbow settings must use supported numeric values", invalid);
+        }
+    }
+
+    private static Duration seconds(String value) {
+        var nanos = new java.math.BigDecimal(value).movePointRight(9).toBigIntegerExact().longValueExact();
+        return Duration.ofNanos(nanos);
+    }
+
+    private static double finite(String value) {
+        double result = new java.math.BigDecimal(value).doubleValue();
+        if (!Double.isFinite(result)) throw new IllegalArgumentException("Setting is not finite");
+        return result;
+    }
+
+    private void save(String key, 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 savedKey)) throw new IOException("Invalid configuration key");
+                        document.put(savedKey, entry.getValue());
+                    }
+                }
+            }
+            document.put(key, value);
+            byte[] bytes = yaml.dump(document).getBytes(StandardCharsets.UTF_8);
+            if (bytes.length > MAX_BYTES) throw new IOException("Configuration too large");
+            Path temporary = Files.createTempFile(directory, ".config-", ".tmp");
+            try {
+                try (var output = FileChannel.open(temporary, StandardOpenOption.WRITE, LinkOption.NOFOLLOW_LINKS)) {
+                    var buffer = ByteBuffer.wrap(bytes); while (buffer.hasRemaining()) output.write(buffer); output.force(true);
+                }
+                replacement.move(temporary, file);
+            } finally { Files.deleteIfExists(temporary); }
+        } catch (OverlappingFileLockException busy) { throw new IOException("Configuration busy"); }
+    }
+
+    private synchronized void finished() {
+        pending--;
+        if (closed && pending == 0) drained.complete(null);
+    }
+    public CompletionStage<Void> drained() { return drained.minimalCompletionStage(); }
+    @Override public synchronized void close() {
+        closed = true; worker.shutdown(); if (pending == 0) drained.complete(null);
+    }
+}

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

@@ -0,0 +1,188 @@
+package games.dmg.fantasystick.persistence;
+
+import games.dmg.fantasystick.ability.Quickstep;
+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.time.Duration;
+import java.util.LinkedHashMap;
+import java.util.List;
+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;
+
+/** Serialized durable Quickstep settings; publication remains a server-thread caller decision. */
+public final class QuickstepSettings implements AutoCloseable {
+    private static final int MAX_BYTES = 1_048_576;
+    public static final String COOLDOWN = "quickstep-cooldown-seconds";
+    public static final String DISTANCE = "quickstep-distance-blocks";
+    public static final String SPEED = "quickstep-speed-blocks-per-tick";
+    private static final List<String> KEYS = List.of(COOLDOWN, DISTANCE, SPEED);
+    private static final Map<String, String> DEFAULTS = Map.of(COOLDOWN, "5", DISTANCE, "4", SPEED, "1");
+
+    @FunctionalInterface interface Replacement { void move(Path from, Path to) throws IOException; }
+    public record Update(String key, String value, Quickstep.Settings settings,
+                         Map<String, String> values, long sequence) {
+        public Update { values = Map.copyOf(values); }
+    }
+
+    private final Path directory;
+    private final Replacement replacement;
+    private final java.util.concurrent.ExecutorService worker = Executors.newSingleThreadExecutor(
+        task -> new Thread(task, "fantasy-quickstep-configuration"));
+    private volatile Map<String, String> effectiveValues;
+    private Map<String, String> persistedValues;
+    private long persistedSequence;
+    private long publishedSequence;
+    private boolean closed;
+    private int pending;
+    private final CompletableFuture<Void> drained = new CompletableFuture<>();
+
+    public QuickstepSettings(Path directory, Map<String, String> initial) {
+        this(directory, initial, (from, to) -> Files.move(from, to,
+            StandardCopyOption.ATOMIC_MOVE, StandardCopyOption.REPLACE_EXISTING));
+    }
+
+    QuickstepSettings(Path directory, Map<String, String> initial, Replacement replacement) {
+        this.directory = Objects.requireNonNull(directory).toAbsolutePath();
+        this.replacement = Objects.requireNonNull(replacement);
+        var copy = new LinkedHashMap<String, String>();
+        for (String key : KEYS) copy.put(key, Objects.requireNonNull(initial.get(key)));
+        parse(copy);
+        effectiveValues = Map.copyOf(copy); persistedValues = Map.copyOf(copy);
+    }
+
+    public static List<String> keys() { return KEYS; }
+    public static String defaultValue(String key) { return DEFAULTS.get(key); }
+    public String value(String key) { return effectiveValues.get(key); }
+    public Quickstep.Settings settings() { return parse(effectiveValues); }
+
+    /** Publish only after the caller returns the durable acknowledgment to the server thread. */
+    public synchronized void publish(Update update) {
+        Objects.requireNonNull(update);
+        if (update.sequence() <= publishedSequence) return;
+        parse(update.values());
+        effectiveValues = update.values(); publishedSequence = update.sequence();
+    }
+
+    public CompletionStage<Update> set(String key, String value) {
+        Objects.requireNonNull(key); Objects.requireNonNull(value);
+        if (!KEYS.contains(key)) return CompletableFuture.failedStage(new IllegalArgumentException("Unknown setting"));
+        String accepted = canonical(key, value);
+        var preview = new LinkedHashMap<>(effectiveValues); preview.put(key, accepted);
+        parse(preview); // Fail malformed/out-of-range command input before queueing accepted persistence.
+        synchronized (this) {
+            if (closed) return CompletableFuture.failedStage(new IOException("Configuration store is closed"));
+            pending++;
+        }
+        try {
+            return CompletableFuture.supplyAsync(() -> {
+                try {
+                    var next = new LinkedHashMap<>(persistedValues);
+                    next.put(key, accepted);
+                    var parsed = parse(next);
+                    save(key, accepted);
+                    persistedValues = Map.copyOf(next);
+                    return new Update(key, accepted, parsed, persistedValues, ++persistedSequence);
+                } catch (IOException | RuntimeException failure) {
+                    throw new java.util.concurrent.CompletionException(failure instanceof IllegalArgumentException
+                        ? failure : new IOException("Quickstep configuration save refused or failed; effective settings unchanged"));
+                } finally { finished(); }
+            }, worker).minimalCompletionStage();
+        } catch (RejectedExecutionException rejected) {
+            finished();
+            return CompletableFuture.failedStage(new IOException("Configuration store is closed"));
+        }
+    }
+
+    private static String canonical(String key, String raw) {
+        try {
+            return new java.math.BigDecimal(raw).stripTrailingZeros().toPlainString();
+        } catch (NumberFormatException invalid) { throw new IllegalArgumentException("Invalid value", invalid); }
+    }
+
+    public static Quickstep.Settings parse(Map<String, String> values) {
+        try {
+            var cooldown = seconds(values.get(COOLDOWN));
+            double distance = finite(values.get(DISTANCE));
+            double speed = finite(values.get(SPEED));
+            return new Quickstep.Settings(cooldown, distance, speed);
+        } catch (ArithmeticException | NumberFormatException | NullPointerException invalid) {
+            throw new IllegalArgumentException("Quickstep settings must use supported numeric values", invalid);
+        }
+    }
+
+    private static Duration seconds(String value) {
+        var nanos = new java.math.BigDecimal(value).movePointRight(9).toBigIntegerExact().longValueExact();
+        return Duration.ofNanos(nanos);
+    }
+
+    private static double finite(String value) {
+        double result = new java.math.BigDecimal(value).doubleValue();
+        if (!Double.isFinite(result)) throw new IllegalArgumentException("Setting is not finite");
+        return result;
+    }
+
+    private void save(String key, 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 savedKey)) throw new IOException("Invalid configuration key");
+                        document.put(savedKey, entry.getValue());
+                    }
+                }
+            }
+            document.put(key, value);
+            byte[] bytes = yaml.dump(document).getBytes(StandardCharsets.UTF_8);
+            if (bytes.length > MAX_BYTES) throw new IOException("Configuration too large");
+            Path temporary = Files.createTempFile(directory, ".config-", ".tmp");
+            try {
+                try (var output = FileChannel.open(temporary, StandardOpenOption.WRITE, LinkOption.NOFOLLOW_LINKS)) {
+                    var buffer = ByteBuffer.wrap(bytes); while (buffer.hasRemaining()) output.write(buffer); output.force(true);
+                }
+                replacement.move(temporary, file);
+            } finally { Files.deleteIfExists(temporary); }
+        } catch (OverlappingFileLockException busy) { throw new IOException("Configuration busy"); }
+    }
+
+    private synchronized void finished() {
+        pending--;
+        if (closed && pending == 0) drained.complete(null);
+    }
+    public CompletionStage<Void> drained() { return drained.minimalCompletionStage(); }
+    @Override public synchronized void close() {
+        closed = true; worker.shutdown(); if (pending == 0) drained.complete(null);
+    }
+}

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

@@ -0,0 +1,187 @@
+package games.dmg.fantasystick.persistence;
+
+import games.dmg.fantasystick.ability.SecondWind;
+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.time.Duration;
+import java.util.LinkedHashMap;
+import java.util.List;
+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;
+
+/** Serialized durable SecondWind settings; publication remains a server-thread caller decision. */
+public final class SecondWindSettings implements AutoCloseable {
+    private static final int MAX_BYTES = 1_048_576;
+    public static final String BASE_HEALING = "second-wind-base-healing";
+    public static final String COOLDOWN = "second-wind-cooldown-seconds";
+    private static final List<String> KEYS = List.of(BASE_HEALING, COOLDOWN);
+    private static final Map<String, String> DEFAULTS = Map.of(BASE_HEALING, "6", COOLDOWN, "15");
+
+    @FunctionalInterface interface Replacement { void move(Path from, Path to) throws IOException; }
+    public record Update(String key, String value, SecondWind.Settings settings,
+                         Map<String, String> values, long sequence) {
+        public Update { values = Map.copyOf(values); }
+    }
+
+    private final Path directory;
+    private final Replacement replacement;
+    private final java.util.concurrent.ExecutorService worker = Executors.newSingleThreadExecutor(
+        task -> new Thread(task, "fantasy-second-wind-configuration"));
+    private volatile Map<String, String> effectiveValues;
+    private Map<String, String> persistedValues;
+    private long persistedSequence;
+    private long publishedSequence;
+    private boolean closed;
+    private int pending;
+    private final CompletableFuture<Void> drained = new CompletableFuture<>();
+
+    public SecondWindSettings(Path directory, Map<String, String> initial) {
+        this(directory, initial, (from, to) -> Files.move(from, to,
+            StandardCopyOption.ATOMIC_MOVE, StandardCopyOption.REPLACE_EXISTING));
+    }
+
+    SecondWindSettings(Path directory, Map<String, String> initial, Replacement replacement) {
+        this.directory = Objects.requireNonNull(directory).toAbsolutePath();
+        this.replacement = Objects.requireNonNull(replacement);
+        var copy = new LinkedHashMap<String, String>();
+        for (String key : KEYS) copy.put(key, Objects.requireNonNull(initial.get(key)));
+        parse(copy);
+        effectiveValues = Map.copyOf(copy); persistedValues = Map.copyOf(copy);
+    }
+
+    public static List<String> keys() { return KEYS; }
+    public static String defaultValue(String key) { return DEFAULTS.get(key); }
+    public String value(String key) { return effectiveValues.get(key); }
+    public SecondWind.Settings settings() { return parse(effectiveValues); }
+
+    /** Publish only after the caller returns the durable acknowledgment to the server thread. */
+    public synchronized void publish(Update update) {
+        Objects.requireNonNull(update);
+        if (update.sequence() <= publishedSequence) return;
+        parse(update.values());
+        effectiveValues = update.values(); publishedSequence = update.sequence();
+    }
+
+    public CompletionStage<Update> set(String key, String value) {
+        Objects.requireNonNull(key); Objects.requireNonNull(value);
+        if (!KEYS.contains(key)) return CompletableFuture.failedStage(new IllegalArgumentException("Unknown setting"));
+        String accepted = canonical(key, value);
+        var preview = new LinkedHashMap<>(effectiveValues); preview.put(key, accepted);
+        parse(preview); // Fail malformed/out-of-range command input before queueing accepted persistence.
+        synchronized (this) {
+            if (closed) return CompletableFuture.failedStage(new IOException("Configuration store is closed"));
+            pending++;
+        }
+        try {
+            return CompletableFuture.supplyAsync(() -> {
+                try {
+                    var next = new LinkedHashMap<>(persistedValues);
+                    next.put(key, accepted);
+                    var parsed = parse(next);
+                    save(key, accepted);
+                    persistedValues = Map.copyOf(next);
+                    return new Update(key, accepted, parsed, persistedValues, ++persistedSequence);
+                } catch (IOException | RuntimeException failure) {
+                    throw new java.util.concurrent.CompletionException(failure instanceof IllegalArgumentException
+                        ? failure : new IOException("SecondWind configuration save refused or failed; effective settings unchanged"));
+                } finally { finished(); }
+            }, worker).minimalCompletionStage();
+        } catch (RejectedExecutionException rejected) {
+            finished();
+            return CompletableFuture.failedStage(new IOException("Configuration store is closed"));
+        }
+    }
+
+    private static String canonical(String key, String raw) {
+        try {
+            if (key.equals(BASE_HEALING)) return new java.math.BigInteger(raw).toString();
+            return new java.math.BigDecimal(raw).stripTrailingZeros().toPlainString();
+        } catch (NumberFormatException invalid) { throw new IllegalArgumentException("Invalid value", invalid); }
+    }
+
+    public static SecondWind.Settings parse(Map<String, String> values) {
+        try {
+            var base = new java.math.BigInteger(values.get(BASE_HEALING));
+            var cooldown = seconds(values.get(COOLDOWN));
+            return new SecondWind.Settings(base, cooldown);
+        } catch (ArithmeticException | NumberFormatException | NullPointerException invalid) {
+            throw new IllegalArgumentException("SecondWind settings must use supported numeric values", invalid);
+        }
+    }
+
+    private static Duration seconds(String value) {
+        var nanos = new java.math.BigDecimal(value).movePointRight(9).toBigIntegerExact().longValueExact();
+        return Duration.ofNanos(nanos);
+    }
+
+    private static double finite(String value) {
+        double result = new java.math.BigDecimal(value).doubleValue();
+        if (!Double.isFinite(result)) throw new IllegalArgumentException("Setting is not finite");
+        return result;
+    }
+
+    private void save(String key, 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 savedKey)) throw new IOException("Invalid configuration key");
+                        document.put(savedKey, entry.getValue());
+                    }
+                }
+            }
+            document.put(key, value);
+            byte[] bytes = yaml.dump(document).getBytes(StandardCharsets.UTF_8);
+            if (bytes.length > MAX_BYTES) throw new IOException("Configuration too large");
+            Path temporary = Files.createTempFile(directory, ".config-", ".tmp");
+            try {
+                try (var output = FileChannel.open(temporary, StandardOpenOption.WRITE, LinkOption.NOFOLLOW_LINKS)) {
+                    var buffer = ByteBuffer.wrap(bytes); while (buffer.hasRemaining()) output.write(buffer); output.force(true);
+                }
+                replacement.move(temporary, file);
+            } finally { Files.deleteIfExists(temporary); }
+        } catch (OverlappingFileLockException busy) { throw new IOException("Configuration busy"); }
+    }
+
+    private synchronized void finished() {
+        pending--;
+        if (closed && pending == 0) drained.complete(null);
+    }
+    public CompletionStage<Void> drained() { return drained.minimalCompletionStage(); }
+    @Override public synchronized void close() {
+        closed = true; worker.shutdown(); if (pending == 0) drained.complete(null);
+    }
+}

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

@@ -0,0 +1,192 @@
+package games.dmg.fantasystick.persistence;
+
+import games.dmg.fantasystick.ability.ShieldBash;
+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.time.Duration;
+import java.util.LinkedHashMap;
+import java.util.List;
+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;
+
+/** Serialized durable Shield Bash settings; publication remains a server-thread caller decision. */
+public final class ShieldBashSettings implements AutoCloseable {
+    private static final int MAX_BYTES = 1_048_576;
+    public static final String BASE_DAMAGE = "shield-bash-base-damage";
+    public static final String COOLDOWN = "shield-bash-cooldown-seconds";
+    public static final String RANGE = "shield-bash-range-blocks";
+    public static final String HORIZONTAL = "shield-bash-horizontal-knockback";
+    public static final String VERTICAL = "shield-bash-minimum-vertical-knockback";
+    private static final List<String> KEYS = List.of(BASE_DAMAGE, COOLDOWN, RANGE, HORIZONTAL, VERTICAL);
+    private static final Map<String, String> DEFAULTS = Map.of(BASE_DAMAGE, "4", COOLDOWN, "6", RANGE, "3",
+        HORIZONTAL, "0.8", VERTICAL, "0.35");
+
+    @FunctionalInterface interface Replacement { void move(Path from, Path to) throws IOException; }
+    public record Update(String key, String value, ShieldBash.Settings settings,
+                         Map<String, String> values, long sequence) {
+        public Update { values = Map.copyOf(values); }
+    }
+
+    private final Path directory;
+    private final Replacement replacement;
+    private final java.util.concurrent.ExecutorService worker = Executors.newSingleThreadExecutor(
+        task -> new Thread(task, "fantasy-shield-bash-configuration"));
+    private volatile Map<String, String> effectiveValues;
+    private Map<String, String> persistedValues;
+    private long persistedSequence;
+    private long publishedSequence;
+    private boolean closed;
+    private int pending;
+    private final CompletableFuture<Void> drained = new CompletableFuture<>();
+
+    public ShieldBashSettings(Path directory, Map<String, String> initial) {
+        this(directory, initial, (from, to) -> Files.move(from, to,
+            StandardCopyOption.ATOMIC_MOVE, StandardCopyOption.REPLACE_EXISTING));
+    }
+
+    ShieldBashSettings(Path directory, Map<String, String> initial, Replacement replacement) {
+        this.directory = Objects.requireNonNull(directory).toAbsolutePath();
+        this.replacement = Objects.requireNonNull(replacement);
+        var copy = new LinkedHashMap<String, String>();
+        for (String key : KEYS) copy.put(key, Objects.requireNonNull(initial.get(key)));
+        parse(copy);
+        effectiveValues = Map.copyOf(copy); persistedValues = Map.copyOf(copy);
+    }
+
+    public static List<String> keys() { return KEYS; }
+    public static String defaultValue(String key) { return DEFAULTS.get(key); }
+    public String value(String key) { return effectiveValues.get(key); }
+    public ShieldBash.Settings settings() { return parse(effectiveValues); }
+
+    /** Publish only after the caller returns the durable acknowledgment to the server thread. */
+    public synchronized void publish(Update update) {
+        Objects.requireNonNull(update);
+        if (update.sequence() <= publishedSequence) return;
+        parse(update.values());
+        effectiveValues = update.values(); publishedSequence = update.sequence();
+    }
+
+    public CompletionStage<Update> set(String key, String value) {
+        Objects.requireNonNull(key); Objects.requireNonNull(value);
+        if (!KEYS.contains(key)) return CompletableFuture.failedStage(new IllegalArgumentException("Unknown setting"));
+        String accepted = canonical(key, value);
+        var preview = new LinkedHashMap<>(effectiveValues); preview.put(key, accepted);
+        parse(preview); // Fail malformed/out-of-range command input before queueing accepted persistence.
+        synchronized (this) {
+            if (closed) return CompletableFuture.failedStage(new IOException("Configuration store is closed"));
+            pending++;
+        }
+        try {
+            return CompletableFuture.supplyAsync(() -> {
+                try {
+                    var next = new LinkedHashMap<>(persistedValues);
+                    next.put(key, accepted);
+                    var parsed = parse(next);
+                    save(key, accepted);
+                    persistedValues = Map.copyOf(next);
+                    return new Update(key, accepted, parsed, persistedValues, ++persistedSequence);
+                } catch (IOException | RuntimeException failure) {
+                    throw new java.util.concurrent.CompletionException(failure instanceof IllegalArgumentException
+                        ? failure : new IOException("Shield Bash configuration save refused or failed; effective settings unchanged"));
+                } finally { finished(); }
+            }, worker).minimalCompletionStage();
+        } catch (RejectedExecutionException rejected) {
+            finished();
+            return CompletableFuture.failedStage(new IOException("Configuration store is closed"));
+        }
+    }
+
+    private static String canonical(String key, String raw) {
+        try {
+            if (key.equals(BASE_DAMAGE)) return new java.math.BigInteger(raw).toString();
+            return new java.math.BigDecimal(raw).stripTrailingZeros().toPlainString();
+        } catch (NumberFormatException invalid) { throw new IllegalArgumentException("Invalid value", invalid); }
+    }
+
+    public static ShieldBash.Settings parse(Map<String, String> values) {
+        try {
+            var base = new java.math.BigInteger(values.get(BASE_DAMAGE));
+            var cooldown = seconds(values.get(COOLDOWN));
+            return new ShieldBash.Settings(base, cooldown, finite(values.get(RANGE)),
+                finite(values.get(HORIZONTAL)), finite(values.get(VERTICAL)));
+        } catch (ArithmeticException | NumberFormatException | NullPointerException invalid) {
+            throw new IllegalArgumentException("Shield Bash settings must use supported numeric values", invalid);
+        }
+    }
+
+    private static Duration seconds(String value) {
+        var nanos = new java.math.BigDecimal(value).movePointRight(9).toBigIntegerExact().longValueExact();
+        return Duration.ofNanos(nanos);
+    }
+
+    private static double finite(String value) {
+        double result = new java.math.BigDecimal(value).doubleValue();
+        if (!Double.isFinite(result)) throw new IllegalArgumentException("Setting is not finite");
+        return result;
+    }
+
+    private void save(String key, 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 savedKey)) throw new IOException("Invalid configuration key");
+                        document.put(savedKey, entry.getValue());
+                    }
+                }
+            }
+            document.put(key, value);
+            byte[] bytes = yaml.dump(document).getBytes(StandardCharsets.UTF_8);
+            if (bytes.length > MAX_BYTES) throw new IOException("Configuration too large");
+            Path temporary = Files.createTempFile(directory, ".config-", ".tmp");
+            try {
+                try (var output = FileChannel.open(temporary, StandardOpenOption.WRITE, LinkOption.NOFOLLOW_LINKS)) {
+                    var buffer = ByteBuffer.wrap(bytes); while (buffer.hasRemaining()) output.write(buffer); output.force(true);
+                }
+                replacement.move(temporary, file);
+            } finally { Files.deleteIfExists(temporary); }
+        } catch (OverlappingFileLockException busy) { throw new IOException("Configuration busy"); }
+    }
+
+    private synchronized void finished() {
+        pending--;
+        if (closed && pending == 0) drained.complete(null);
+    }
+    public CompletionStage<Void> drained() { return drained.minimalCompletionStage(); }
+    @Override public synchronized void close() {
+        closed = true; worker.shutdown(); if (pending == 0) drained.complete(null);
+    }
+}

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

@@ -0,0 +1,188 @@
+package games.dmg.fantasystick.persistence;
+
+import games.dmg.fantasystick.ability.StoneSkin;
+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.time.Duration;
+import java.util.LinkedHashMap;
+import java.util.List;
+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;
+
+/** Serialized durable Stone Skin settings; publication remains a server-thread caller decision. */
+public final class StoneSkinSettings implements AutoCloseable {
+    private static final int MAX_BYTES = 1_048_576;
+    public static final String COOLDOWN = "stone-skin-cooldown-seconds";
+    public static final String DURATION = "stone-skin-duration-seconds";
+    public static final String REDUCTION = "stone-skin-damage-reduction-percent";
+    private static final List<String> KEYS = List.of(COOLDOWN, DURATION, REDUCTION);
+    private static final Map<String, String> DEFAULTS = Map.of(COOLDOWN, "14", DURATION, "4", REDUCTION, "25");
+
+    @FunctionalInterface interface Replacement { void move(Path from, Path to) throws IOException; }
+    public record Update(String key, String value, StoneSkin.Settings settings,
+                         Map<String, String> values, long sequence) {
+        public Update { values = Map.copyOf(values); }
+    }
+
+    private final Path directory;
+    private final Replacement replacement;
+    private final java.util.concurrent.ExecutorService worker = Executors.newSingleThreadExecutor(
+        task -> new Thread(task, "fantasy-stone-skin-configuration"));
+    private volatile Map<String, String> effectiveValues;
+    private Map<String, String> persistedValues;
+    private long persistedSequence;
+    private long publishedSequence;
+    private boolean closed;
+    private int pending;
+    private final CompletableFuture<Void> drained = new CompletableFuture<>();
+
+    public StoneSkinSettings(Path directory, Map<String, String> initial) {
+        this(directory, initial, (from, to) -> Files.move(from, to,
+            StandardCopyOption.ATOMIC_MOVE, StandardCopyOption.REPLACE_EXISTING));
+    }
+
+    StoneSkinSettings(Path directory, Map<String, String> initial, Replacement replacement) {
+        this.directory = Objects.requireNonNull(directory).toAbsolutePath();
+        this.replacement = Objects.requireNonNull(replacement);
+        var copy = new LinkedHashMap<String, String>();
+        for (String key : KEYS) copy.put(key, Objects.requireNonNull(initial.get(key)));
+        parse(copy);
+        effectiveValues = Map.copyOf(copy); persistedValues = Map.copyOf(copy);
+    }
+
+    public static List<String> keys() { return KEYS; }
+    public static String defaultValue(String key) { return DEFAULTS.get(key); }
+    public String value(String key) { return effectiveValues.get(key); }
+    public StoneSkin.Settings settings() { return parse(effectiveValues); }
+
+    /** Publish only after the caller returns the durable acknowledgment to the server thread. */
+    public synchronized void publish(Update update) {
+        Objects.requireNonNull(update);
+        if (update.sequence() <= publishedSequence) return;
+        parse(update.values());
+        effectiveValues = update.values(); publishedSequence = update.sequence();
+    }
+
+    public CompletionStage<Update> set(String key, String value) {
+        Objects.requireNonNull(key); Objects.requireNonNull(value);
+        if (!KEYS.contains(key)) return CompletableFuture.failedStage(new IllegalArgumentException("Unknown setting"));
+        String accepted = canonical(key, value);
+        var preview = new LinkedHashMap<>(effectiveValues); preview.put(key, accepted);
+        parse(preview); // Fail malformed/out-of-range command input before queueing accepted persistence.
+        synchronized (this) {
+            if (closed) return CompletableFuture.failedStage(new IOException("Configuration store is closed"));
+            pending++;
+        }
+        try {
+            return CompletableFuture.supplyAsync(() -> {
+                try {
+                    var next = new LinkedHashMap<>(persistedValues);
+                    next.put(key, accepted);
+                    var parsed = parse(next);
+                    save(key, accepted);
+                    persistedValues = Map.copyOf(next);
+                    return new Update(key, accepted, parsed, persistedValues, ++persistedSequence);
+                } catch (IOException | RuntimeException failure) {
+                    throw new java.util.concurrent.CompletionException(failure instanceof IllegalArgumentException
+                        ? failure : new IOException("Stone Skin configuration save refused or failed; effective settings unchanged"));
+                } finally { finished(); }
+            }, worker).minimalCompletionStage();
+        } catch (RejectedExecutionException rejected) {
+            finished();
+            return CompletableFuture.failedStage(new IOException("Configuration store is closed"));
+        }
+    }
+
+    private static String canonical(String key, String raw) {
+        try {
+            return new java.math.BigDecimal(raw).stripTrailingZeros().toPlainString();
+        } catch (NumberFormatException invalid) { throw new IllegalArgumentException("Invalid value", invalid); }
+    }
+
+    public static StoneSkin.Settings parse(Map<String, String> values) {
+        try {
+            var cooldown = seconds(values.get(COOLDOWN));
+            var duration = seconds(values.get(DURATION));
+            var reduction = new java.math.BigDecimal(values.get(REDUCTION));
+            return new StoneSkin.Settings(cooldown, duration, reduction);
+        } catch (ArithmeticException | NumberFormatException | NullPointerException invalid) {
+            throw new IllegalArgumentException("Stone Skin settings must use supported numeric values", invalid);
+        }
+    }
+
+    private static Duration seconds(String value) {
+        var nanos = new java.math.BigDecimal(value).movePointRight(9).toBigIntegerExact().longValueExact();
+        return Duration.ofNanos(nanos);
+    }
+
+    private static double finite(String value) {
+        double result = new java.math.BigDecimal(value).doubleValue();
+        if (!Double.isFinite(result)) throw new IllegalArgumentException("Setting is not finite");
+        return result;
+    }
+
+    private void save(String key, 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 savedKey)) throw new IOException("Invalid configuration key");
+                        document.put(savedKey, entry.getValue());
+                    }
+                }
+            }
+            document.put(key, value);
+            byte[] bytes = yaml.dump(document).getBytes(StandardCharsets.UTF_8);
+            if (bytes.length > MAX_BYTES) throw new IOException("Configuration too large");
+            Path temporary = Files.createTempFile(directory, ".config-", ".tmp");
+            try {
+                try (var output = FileChannel.open(temporary, StandardOpenOption.WRITE, LinkOption.NOFOLLOW_LINKS)) {
+                    var buffer = ByteBuffer.wrap(bytes); while (buffer.hasRemaining()) output.write(buffer); output.force(true);
+                }
+                replacement.move(temporary, file);
+            } finally { Files.deleteIfExists(temporary); }
+        } catch (OverlappingFileLockException busy) { throw new IOException("Configuration busy"); }
+    }
+
+    private synchronized void finished() {
+        pending--;
+        if (closed && pending == 0) drained.complete(null);
+    }
+    public CompletionStage<Void> drained() { return drained.minimalCompletionStage(); }
+    @Override public synchronized void close() {
+        closed = true; worker.shutdown(); if (pending == 0) drained.complete(null);
+    }
+}

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

@@ -21,6 +21,19 @@ public final class EquipmentAdminCommand implements TabExecutor, AutoCloseable {
     private final Consumer<Failure> diagnostics;
     private volatile boolean closed;
     private games.dmg.fantasystick.persistence.AdventureSettings settings;
+    private games.dmg.fantasystick.persistence.FrostShardSettings frostSettings;
+    private games.dmg.fantasystick.ability.FrostShard frostShard;
+    private games.dmg.fantasystick.ability.AbilityRegistry abilities;
+    private games.dmg.fantasystick.persistence.LongbowSettings longbowSettings;
+    private games.dmg.fantasystick.ability.Longbow longbow;
+    private games.dmg.fantasystick.persistence.QuickstepSettings quickstepSettings;
+    private games.dmg.fantasystick.ability.Quickstep quickstep;
+    private games.dmg.fantasystick.persistence.SecondWindSettings secondWindSettings;
+    private games.dmg.fantasystick.ability.SecondWind secondWind;
+    private games.dmg.fantasystick.persistence.StoneSkinSettings stoneSkinSettings;
+    private games.dmg.fantasystick.ability.StoneSkin stoneSkin;
+    private games.dmg.fantasystick.persistence.ShieldBashSettings shieldBashSettings;
+    private games.dmg.fantasystick.ability.ShieldBash shieldBash;
 
     public EquipmentAdminCommand(EquipmentSessionStore receipts, EquipmentSessions sessions, Server server,
                                  Consumer<Runnable> nextTick, Consumer<Failure> diagnostics) {
@@ -38,6 +51,108 @@ public final class EquipmentAdminCommand implements TabExecutor, AutoCloseable {
         this.settings = Objects.requireNonNull(settings);
     }
 
+    public EquipmentAdminCommand(EquipmentSessionStore receipts, EquipmentSessions sessions, Server server,
+                                 Consumer<Runnable> nextTick, Consumer<Failure> diagnostics,
+                                 games.dmg.fantasystick.persistence.AdventureSettings settings,
+                                 games.dmg.fantasystick.persistence.FrostShardSettings frostSettings,
+                                 games.dmg.fantasystick.ability.FrostShard frostShard,
+                                 games.dmg.fantasystick.ability.AbilityRegistry abilities) {
+        this(receipts, sessions, server, nextTick, diagnostics, settings);
+        this.frostSettings = Objects.requireNonNull(frostSettings);
+        this.frostShard = Objects.requireNonNull(frostShard);
+        this.abilities = Objects.requireNonNull(abilities);
+    }
+
+    public EquipmentAdminCommand(EquipmentSessionStore receipts, EquipmentSessions sessions, Server server,
+                                 Consumer<Runnable> nextTick, Consumer<Failure> diagnostics,
+                                 games.dmg.fantasystick.persistence.AdventureSettings settings,
+                                 games.dmg.fantasystick.persistence.FrostShardSettings frostSettings,
+                                 games.dmg.fantasystick.ability.FrostShard frostShard,
+                                 games.dmg.fantasystick.persistence.LongbowSettings longbowSettings,
+                                 games.dmg.fantasystick.ability.Longbow longbow,
+                                 games.dmg.fantasystick.ability.AbilityRegistry abilities) {
+        this(receipts, sessions, server, nextTick, diagnostics, settings, frostSettings, frostShard, abilities);
+        this.longbowSettings = Objects.requireNonNull(longbowSettings);
+        this.longbow = Objects.requireNonNull(longbow);
+    }
+
+    public EquipmentAdminCommand(EquipmentSessionStore receipts, EquipmentSessions sessions, Server server,
+                                 Consumer<Runnable> nextTick, Consumer<Failure> diagnostics,
+                                 games.dmg.fantasystick.persistence.AdventureSettings settings,
+                                 games.dmg.fantasystick.persistence.FrostShardSettings frostSettings,
+                                 games.dmg.fantasystick.ability.FrostShard frostShard,
+                                 games.dmg.fantasystick.persistence.LongbowSettings longbowSettings,
+                                 games.dmg.fantasystick.ability.Longbow longbow,
+                                 games.dmg.fantasystick.persistence.QuickstepSettings quickstepSettings,
+                                 games.dmg.fantasystick.ability.Quickstep quickstep,
+                                 games.dmg.fantasystick.ability.AbilityRegistry abilities) {
+        this(receipts, sessions, server, nextTick, diagnostics, settings, frostSettings, frostShard,
+            longbowSettings, longbow, abilities);
+        this.quickstepSettings = Objects.requireNonNull(quickstepSettings);
+        this.quickstep = Objects.requireNonNull(quickstep);
+    }
+
+    public EquipmentAdminCommand(EquipmentSessionStore receipts, EquipmentSessions sessions, Server server,
+                                 Consumer<Runnable> nextTick, Consumer<Failure> diagnostics,
+                                 games.dmg.fantasystick.persistence.AdventureSettings settings,
+                                 games.dmg.fantasystick.persistence.FrostShardSettings frostSettings,
+                                 games.dmg.fantasystick.ability.FrostShard frostShard,
+                                 games.dmg.fantasystick.persistence.LongbowSettings longbowSettings,
+                                 games.dmg.fantasystick.ability.Longbow longbow,
+                                 games.dmg.fantasystick.persistence.QuickstepSettings quickstepSettings,
+                                 games.dmg.fantasystick.ability.Quickstep quickstep,
+                                 games.dmg.fantasystick.persistence.SecondWindSettings secondWindSettings,
+                                 games.dmg.fantasystick.ability.SecondWind secondWind,
+                                 games.dmg.fantasystick.ability.AbilityRegistry abilities) {
+        this(receipts, sessions, server, nextTick, diagnostics, settings, frostSettings, frostShard,
+            longbowSettings, longbow, quickstepSettings, quickstep, abilities);
+        this.secondWindSettings = Objects.requireNonNull(secondWindSettings);
+        this.secondWind = Objects.requireNonNull(secondWind);
+    }
+
+    public EquipmentAdminCommand(EquipmentSessionStore receipts, EquipmentSessions sessions, Server server,
+                                 Consumer<Runnable> nextTick, Consumer<Failure> diagnostics,
+                                 games.dmg.fantasystick.persistence.AdventureSettings settings,
+                                 games.dmg.fantasystick.persistence.FrostShardSettings frostSettings,
+                                 games.dmg.fantasystick.ability.FrostShard frostShard,
+                                 games.dmg.fantasystick.persistence.LongbowSettings longbowSettings,
+                                 games.dmg.fantasystick.ability.Longbow longbow,
+                                 games.dmg.fantasystick.persistence.QuickstepSettings quickstepSettings,
+                                 games.dmg.fantasystick.ability.Quickstep quickstep,
+                                 games.dmg.fantasystick.persistence.SecondWindSettings secondWindSettings,
+                                 games.dmg.fantasystick.ability.SecondWind secondWind,
+                                 games.dmg.fantasystick.persistence.StoneSkinSettings stoneSkinSettings,
+                                 games.dmg.fantasystick.ability.StoneSkin stoneSkin,
+                                 games.dmg.fantasystick.ability.AbilityRegistry abilities) {
+        this(receipts, sessions, server, nextTick, diagnostics, settings, frostSettings, frostShard,
+            longbowSettings, longbow, quickstepSettings, quickstep, secondWindSettings, secondWind, abilities);
+        this.stoneSkinSettings = Objects.requireNonNull(stoneSkinSettings);
+        this.stoneSkin = Objects.requireNonNull(stoneSkin);
+    }
+
+    public EquipmentAdminCommand(EquipmentSessionStore receipts, EquipmentSessions sessions, Server server,
+                                 Consumer<Runnable> nextTick, Consumer<Failure> diagnostics,
+                                 games.dmg.fantasystick.persistence.AdventureSettings settings,
+                                 games.dmg.fantasystick.persistence.FrostShardSettings frostSettings,
+                                 games.dmg.fantasystick.ability.FrostShard frostShard,
+                                 games.dmg.fantasystick.persistence.LongbowSettings longbowSettings,
+                                 games.dmg.fantasystick.ability.Longbow longbow,
+                                 games.dmg.fantasystick.persistence.QuickstepSettings quickstepSettings,
+                                 games.dmg.fantasystick.ability.Quickstep quickstep,
+                                 games.dmg.fantasystick.persistence.SecondWindSettings secondWindSettings,
+                                 games.dmg.fantasystick.ability.SecondWind secondWind,
+                                 games.dmg.fantasystick.persistence.StoneSkinSettings stoneSkinSettings,
+                                 games.dmg.fantasystick.ability.StoneSkin stoneSkin,
+                                 games.dmg.fantasystick.persistence.ShieldBashSettings shieldBashSettings,
+                                 games.dmg.fantasystick.ability.ShieldBash shieldBash,
+                                 games.dmg.fantasystick.ability.AbilityRegistry abilities) {
+        this(receipts, sessions, server, nextTick, diagnostics, settings, frostSettings, frostShard,
+            longbowSettings, longbow, quickstepSettings, quickstep, secondWindSettings, secondWind,
+            stoneSkinSettings, stoneSkin, abilities);
+        this.shieldBashSettings = Objects.requireNonNull(shieldBashSettings);
+        this.shieldBash = Objects.requireNonNull(shieldBash);
+    }
+
     @Override public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
         if (closed) return true;
         if (!sender.hasPermission(PERMISSION)) {
@@ -109,15 +224,206 @@ public final class EquipmentAdminCommand implements TabExecutor, AutoCloseable {
     }
 
     private void configuration(CommandSender sender, String[] args) {
-        if (args.length < 2 || args.length > 3 || !args[1].equals("adventure-mode")
-                || args.length == 3 && !args[2].equals("true") && !args[2].equals("false")) {
-            sender.sendMessage("Usage: /fantasystick config adventure-mode [true|false]");
+        if (args.length < 2 || args.length > 3) { configurationUsage(sender); return; }
+        if (args[1].equals("adventure-mode")) { adventureConfiguration(sender, args); return; }
+        if (longbowSettings != null && games.dmg.fantasystick.persistence.LongbowSettings.keys().contains(args[1])) {
+            longbowConfiguration(sender, args); return;
+        }
+        if (quickstepSettings != null && games.dmg.fantasystick.persistence.QuickstepSettings.keys().contains(args[1])) {
+            quickstepConfiguration(sender, args); return;
+        }
+        if (secondWindSettings != null && games.dmg.fantasystick.persistence.SecondWindSettings.keys().contains(args[1])) {
+            secondWindConfiguration(sender, args); return;
+        }
+        if (stoneSkinSettings != null && games.dmg.fantasystick.persistence.StoneSkinSettings.keys().contains(args[1])) {
+            stoneSkinConfiguration(sender, args); return;
+        }
+        if (shieldBashSettings != null && games.dmg.fantasystick.persistence.ShieldBashSettings.keys().contains(args[1])) {
+            shieldBashConfiguration(sender, args); return;
+        }
+        if (frostSettings == null || !games.dmg.fantasystick.persistence.FrostShardSettings.keys().contains(args[1])) {
+            configurationUsage(sender); return;
+        }
+        String key = args[1];
+        if (args.length == 2) {
+            sender.sendMessage(key + "=" + frostSettings.value(key) + " (applies to future Frost Shard casts only)");
             return;
         }
+        java.util.concurrent.CompletionStage<games.dmg.fantasystick.persistence.FrostShardSettings.Update> operation;
+        try { operation = frostSettings.set(key, args[2]); }
+        catch (IllegalArgumentException invalid) {
+            sender.sendMessage("Frost Shard setting is invalid; the effective value is unchanged."); return;
+        }
+        operation.whenComplete((saved, failure) -> {
+            if (failure != null) report(null, "config-" + key, failure);
+            if (closed) return;
+            try {
+                nextTick.accept(() -> {
+                    if (closed) return;
+                    if (failure == null) {
+                        frostShard.configure(saved.settings());
+                        abilities.replace(frostShard.definition());
+                        frostSettings.publish(saved);
+                    }
+                    if (!sender.hasPermission(PERMISSION)
+                            || sender instanceof org.bukkit.entity.Player player && !player.isOnline()) return;
+                    sender.sendMessage(failure == null
+                        ? "Saved " + key + "=" + saved.value() + " for future Frost Shard casts; active effects and deadlines are unchanged."
+                        : "Frost Shard configuration save failed; the effective setting is unchanged.");
+                });
+            } catch (RuntimeException rejected) { report(null, "config-response", rejected); }
+        });
+    }
+
+    private void longbowConfiguration(CommandSender sender, String[] args) {
+        String key = args[1];
+        if (args.length == 2) {
+            sender.sendMessage(key + "=" + longbowSettings.value(key) + " (applies to future Longbow shots only)");
+            return;
+        }
+        java.util.concurrent.CompletionStage<games.dmg.fantasystick.persistence.LongbowSettings.Update> operation;
+        try { operation = longbowSettings.set(key, args[2]); }
+        catch (IllegalArgumentException invalid) {
+            sender.sendMessage("Longbow setting is invalid; the effective value is unchanged."); return;
+        }
+        operation.whenComplete((saved, failure) -> {
+            if (failure != null) report(null, "config-" + key, failure);
+            if (closed) return;
+            try {
+                nextTick.accept(() -> {
+                    if (closed) return;
+                    if (failure == null) {
+                        longbow.configure(saved.settings());
+                        abilities.replace(longbow.definition());
+                        longbowSettings.publish(saved);
+                    }
+                    if (!sender.hasPermission(PERMISSION)
+                            || sender instanceof org.bukkit.entity.Player player && !player.isOnline()) return;
+                    sender.sendMessage(failure == null
+                        ? "Saved " + key + "=" + saved.value() + " for future Longbow shots; active shots and deadlines are unchanged."
+                        : "Longbow configuration save failed; the effective setting is unchanged.");
+                });
+            } catch (RuntimeException rejected) { report(null, "config-response", rejected); }
+        });
+    }
+
+    private void quickstepConfiguration(CommandSender sender, String[] args) {
+        String key = args[1];
+        if (args.length == 2) {
+            sender.sendMessage(key + "=" + quickstepSettings.value(key) + " (applies to future Quickstep dashes only)");
+            return;
+        }
+        java.util.concurrent.CompletionStage<games.dmg.fantasystick.persistence.QuickstepSettings.Update> operation;
+        try { operation = quickstepSettings.set(key, args[2]); }
+        catch (IllegalArgumentException invalid) {
+            sender.sendMessage("Quickstep setting is invalid; the effective value is unchanged."); return;
+        }
+        operation.whenComplete((saved, failure) -> {
+            if (failure != null) report(null, "config-" + key, failure);
+            if (closed) return;
+            try {
+                nextTick.accept(() -> {
+                    if (closed) return;
+                    if (failure == null) {
+                        quickstep.configure(saved.settings()); abilities.replace(quickstep.definition());
+                        quickstepSettings.publish(saved);
+                    }
+                    if (!sender.hasPermission(PERMISSION)
+                            || sender instanceof org.bukkit.entity.Player player && !player.isOnline()) return;
+                    sender.sendMessage(failure == null
+                        ? "Saved " + key + "=" + saved.value() + " for future Quickstep dashes; active movement and deadlines are unchanged."
+                        : "Quickstep configuration save failed; the effective setting is unchanged.");
+                });
+            } catch (RuntimeException rejected) { report(null, "config-response", rejected); }
+        });
+    }
+
+    private void shieldBashConfiguration(CommandSender sender, String[] args) {
+        String key = args[1];
+        if (args.length == 2) { sender.sendMessage(key + "=" + shieldBashSettings.value(key) + " (applies to future Shield Bash strikes only)"); return; }
+        java.util.concurrent.CompletionStage<games.dmg.fantasystick.persistence.ShieldBashSettings.Update> operation;
+        try { operation = shieldBashSettings.set(key, args[2]); }
+        catch (IllegalArgumentException invalid) { sender.sendMessage("Shield Bash setting is invalid; the effective value is unchanged."); return; }
+        operation.whenComplete((saved, failure) -> {
+            if (failure != null) report(null, "config-" + key, failure);
+            if (closed) return;
+            try { nextTick.accept(() -> {
+                if (closed) return;
+                if (failure == null) {
+                    shieldBash.configure(saved.settings()); abilities.replace(shieldBash.definition()); shieldBashSettings.publish(saved);
+                }
+                if (!sender.hasPermission(PERMISSION)
+                        || sender instanceof org.bukkit.entity.Player player && !player.isOnline()) return;
+                sender.sendMessage(failure == null
+                    ? "Saved " + key + "=" + saved.value() + " for future Shield Bash strikes; active work and deadlines are unchanged."
+                    : "Shield Bash configuration save failed; the effective setting is unchanged.");
+            }); } catch (RuntimeException rejected) { report(null, "config-response", rejected); }
+        });
+    }
+
+    private void stoneSkinConfiguration(CommandSender sender, String[] args) {
+        String key = args[1];
+        if (args.length == 2) {
+            sender.sendMessage(key + "=" + stoneSkinSettings.value(key) + " (applies to future Stone Skin casts only)"); return;
+        }
+        java.util.concurrent.CompletionStage<games.dmg.fantasystick.persistence.StoneSkinSettings.Update> operation;
+        try { operation = stoneSkinSettings.set(key, args[2]); }
+        catch (IllegalArgumentException invalid) { sender.sendMessage("Stone Skin setting is invalid; the effective value is unchanged."); return; }
+        operation.whenComplete((saved, failure) -> {
+            if (failure != null) report(null, "config-" + key, failure);
+            if (closed) return;
+            try { nextTick.accept(() -> {
+                if (closed) return;
+                if (failure == null) {
+                    stoneSkin.configure(saved.settings()); abilities.replace(stoneSkin.definition()); stoneSkinSettings.publish(saved);
+                }
+                if (!sender.hasPermission(PERMISSION)
+                        || sender instanceof org.bukkit.entity.Player player && !player.isOnline()) return;
+                sender.sendMessage(failure == null
+                    ? "Saved " + key + "=" + saved.value() + " for future Stone Skin casts; active effects and deadlines are unchanged."
+                    : "Stone Skin configuration save failed; the effective setting is unchanged.");
+            }); } catch (RuntimeException rejected) { report(null, "config-response", rejected); }
+        });
+    }
+
+    private void secondWindConfiguration(CommandSender sender, String[] args) {
+        String key = args[1];
+        if (args.length == 2) {
+            sender.sendMessage(key + "=" + secondWindSettings.value(key) + " (applies to future Second Wind casts only)");
+            return;
+        }
+        java.util.concurrent.CompletionStage<games.dmg.fantasystick.persistence.SecondWindSettings.Update> operation;
+        try { operation = secondWindSettings.set(key, args[2]); }
+        catch (IllegalArgumentException invalid) {
+            sender.sendMessage("Second Wind setting is invalid; the effective value is unchanged."); return;
+        }
+        operation.whenComplete((saved, failure) -> {
+            if (failure != null) report(null, "config-" + key, failure);
+            if (closed) return;
+            try {
+                nextTick.accept(() -> {
+                    if (closed) return;
+                    if (failure == null) {
+                        secondWind.configure(saved.settings()); abilities.replace(secondWind.definition());
+                        secondWindSettings.publish(saved);
+                    }
+                    if (!sender.hasPermission(PERMISSION)
+                            || sender instanceof org.bukkit.entity.Player player && !player.isOnline()) return;
+                    sender.sendMessage(failure == null
+                        ? "Saved " + key + "=" + saved.value() + " for future Second Wind casts; active work and deadlines are unchanged."
+                        : "Second Wind configuration save failed; the effective setting is unchanged.");
+                });
+            } catch (RuntimeException rejected) { report(null, "config-response", rejected); }
+        });
+    }
+
+    private void adventureConfiguration(CommandSender sender, String[] args) {
+        if (args.length == 3 && !args[2].equals("true") && !args[2].equals("false")) {
+            sender.sendMessage("Usage: /fantasystick config adventure-mode [true|false]"); return;
+        }
         if (settings == null) { sender.sendMessage("Adventure configuration is unavailable."); return; }
         if (args.length == 2) {
-            sender.sendMessage("adventure-mode=" + settings.enabled() + " (applies to new sessions only)");
-            return;
+            sender.sendMessage("adventure-mode=" + settings.enabled() + " (applies to new sessions only)"); return;
         }
         settings.set(Boolean.parseBoolean(args[2])).whenComplete((saved, failure) -> {
             if (failure != null) report(null, "config-adventure-mode", failure);
@@ -134,6 +440,10 @@ public final class EquipmentAdminCommand implements TabExecutor, AutoCloseable {
         });
     }
 
+    private static void configurationUsage(CommandSender sender) {
+        sender.sendMessage("Usage: /fantasystick config <setting> [value]");
+    }
+
     private void report(UUID owner, String operation, Throwable cause) {
         try { diagnostics.accept(new Failure(owner, operation, cause)); }
         catch (RuntimeException ignored) { /* Diagnostics cannot authorize recovery. */ }
@@ -141,7 +451,56 @@ public final class EquipmentAdminCommand implements TabExecutor, AutoCloseable {
 
     // Never fall back to Bukkit's online-player-name suggestions for a UUID-only admin interface.
     @Override public List<String> onTabComplete(CommandSender sender, Command command, String alias, String[] args) {
+        if (closed || !sender.hasPermission(PERMISSION)) return List.of();
+        if (args.length == 1) return matching(List.of("config", "inspect", "recover"), args[0]);
+        if (args.length == 2 && args[0].equals("config")) {
+            var keys = new java.util.ArrayList<String>(); keys.add("adventure-mode");
+            keys.addAll(games.dmg.fantasystick.persistence.FrostShardSettings.keys());
+            keys.addAll(games.dmg.fantasystick.persistence.LongbowSettings.keys());
+            keys.addAll(games.dmg.fantasystick.persistence.QuickstepSettings.keys());
+            keys.addAll(games.dmg.fantasystick.persistence.SecondWindSettings.keys());
+            keys.addAll(games.dmg.fantasystick.persistence.StoneSkinSettings.keys());
+            keys.addAll(games.dmg.fantasystick.persistence.ShieldBashSettings.keys());
+            return matching(keys, args[1]);
+        }
+        if (args.length == 3 && args[0].equals("config")) {
+            if (args[1].equals("adventure-mode")) return matching(List.of("false", "true"), 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]);
+                return matching(current.equals(defaults) ? List.of(current) : List.of(current, defaults), args[2]);
+            }
+            if (longbowSettings != null && games.dmg.fantasystick.persistence.LongbowSettings.keys().contains(args[1])) {
+                String current = longbowSettings.value(args[1]);
+                String defaults = games.dmg.fantasystick.persistence.LongbowSettings.defaultValue(args[1]);
+                return matching(current.equals(defaults) ? List.of(current) : List.of(current, defaults), args[2]);
+            }
+            if (quickstepSettings != null && games.dmg.fantasystick.persistence.QuickstepSettings.keys().contains(args[1])) {
+                String current = quickstepSettings.value(args[1]);
+                String defaults = games.dmg.fantasystick.persistence.QuickstepSettings.defaultValue(args[1]);
+                return matching(current.equals(defaults) ? List.of(current) : List.of(current, defaults), args[2]);
+            }
+            if (secondWindSettings != null && games.dmg.fantasystick.persistence.SecondWindSettings.keys().contains(args[1])) {
+                String current = secondWindSettings.value(args[1]);
+                String defaults = games.dmg.fantasystick.persistence.SecondWindSettings.defaultValue(args[1]);
+                return matching(current.equals(defaults) ? List.of(current) : List.of(current, defaults), args[2]);
+            }
+            if (stoneSkinSettings != null && games.dmg.fantasystick.persistence.StoneSkinSettings.keys().contains(args[1])) {
+                String current = stoneSkinSettings.value(args[1]);
+                String defaults = games.dmg.fantasystick.persistence.StoneSkinSettings.defaultValue(args[1]);
+                return matching(current.equals(defaults) ? List.of(current) : List.of(current, defaults), args[2]);
+            }
+            if (shieldBashSettings != null && games.dmg.fantasystick.persistence.ShieldBashSettings.keys().contains(args[1])) {
+                String current = shieldBashSettings.value(args[1]);
+                String defaults = games.dmg.fantasystick.persistence.ShieldBashSettings.defaultValue(args[1]);
+                return matching(current.equals(defaults) ? List.of(current) : List.of(current, defaults), args[2]);
+            }
+        }
         return List.of();
     }
+
+    private static List<String> matching(java.util.Collection<String> values, String prefix) {
+        return values.stream().filter(value -> value.startsWith(prefix)).distinct().sorted().toList();
+    }
     @Override public void close() { closed = true; }
 }

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

@@ -449,7 +449,8 @@ public final class EquipmentSessionEvents implements Listener, AutoCloseable {
         if (special(item)) event.setCancelled(true);
         if (willAttack) {
             var selected = sessions.selectedControl(player, item).orElse(null);
-            if (selected != null && (selected.slot() == 1 || selected.ability().equals("great_sword"))) {
+            if (selected != null && (selected.slot() == 1 || selected.ability().equals("great_sword")
+                    || selected.ability().equals("shield_bash"))) {
                 emit(player, item, selected, ControlInput.Gesture.ATTACK, event.getAttacked(), 0, player.getAttackCooldown());
             }
         }

src/main/resources/config.yml

@@ -21,3 +21,52 @@ fireball-base-damage: 6
 fireball-cooldown-seconds: 4
 fireball-range-blocks: 32
 fireball-lifetime-seconds: 5
+
+# Great Sword defaults from the reviewed starter catalogue.
+great-sword-base-damage: 7
+great-sword-recovery-seconds: 1.2
+
+# Frost Shard defaults from the reviewed remaining-development packet.
+# Admin command: /fantasystick config <key> [value]
+frost-shard-base-damage: 4
+frost-shard-cooldown-seconds: 5
+frost-shard-range-blocks: 32
+frost-shard-lifetime-seconds: 5
+frost-shard-projectile-speed-blocks-per-tick: 1
+frost-shard-slowness-amplifier: 0
+frost-shard-slowness-duration-seconds: 2
+
+# Longbow defaults from the reviewed remaining-development packet.
+# Admin command: /fantasystick config <key> [value]
+longbow-base-damage: 5
+longbow-recovery-seconds: 1
+longbow-minimum-draw-ticks: 3
+longbow-full-draw-ticks: 20
+longbow-range-blocks: 64
+longbow-lifetime-seconds: 10
+longbow-full-projectile-speed-blocks-per-tick: 3
+
+# Quickstep defaults from the reviewed remaining-development packet.
+# Admin command: /fantasystick config <key> [value]
+quickstep-cooldown-seconds: 5
+quickstep-distance-blocks: 4
+quickstep-speed-blocks-per-tick: 1
+
+# Second Wind defaults from the reviewed remaining-development packet.
+# Admin command: /fantasystick config <key> [value]
+second-wind-base-healing: 6
+second-wind-cooldown-seconds: 15
+
+# Stone Skin defaults from the reviewed remaining-development packet.
+# Admin command: /fantasystick config <key> [value]
+stone-skin-cooldown-seconds: 14
+stone-skin-duration-seconds: 4
+stone-skin-damage-reduction-percent: 25
+
+# Shield Bash defaults from the reviewed remaining-development packet.
+# Admin command: /fantasystick config <key> [value]
+shield-bash-base-damage: 4
+shield-bash-cooldown-seconds: 6
+shield-bash-range-blocks: 3
+shield-bash-horizontal-knockback: 0.8
+shield-bash-minimum-vertical-knockback: 0.35

src/main/resources/plugin.yml

@@ -7,8 +7,8 @@ description: Transferable characters, native fantasy health, recoverable equipme
 author: dmg.games
 commands:
   fantasystick:
-    description: Inspect/recover equipment sessions or configure fantasy mode.
-    usage: /fantasystick <inspect|recover> <player-uuid> | config adventure-mode [true|false]
+    description: Inspect/recover equipment sessions or configure Fantasy Stick.
+    usage: /fantasystick <inspect|recover> <player-uuid> | config <setting> [value]
     permission: fantasystick.admin
 permissions:
   fantasystick.admin:

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

@@ -0,0 +1,537 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.ArgumentMatchers.*;
+import static org.mockito.Mockito.*;
+
+import java.math.BigInteger;
+import java.nio.file.Path;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class FrostShardNativeTest {
+    @TempDir Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test void bookAcquisitionEquippedUseAndDirectHitDealDamageAndOwnedSlow() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            withStats(data, a, 12, 10);
+            f.players.put(a.core.id, a.player); f.activate(a);
+
+            a.core.inventory.getInventory().setSelectedSlot(0); PartyBookNativeTest.open(f, a);
+            String book = PartyBookNativeTest.text(a).replaceAll("\\s+", "");
+            assertTrue(book.contains("FrostShard"), book); assertTrue(book.contains("INT12"), book);
+            assertTrue(book.contains("WIS10"), book); assertTrue(book.contains("SlownessI"), book);
+            var learn = abilityButton(a, "[Learn]", "frost_shard");
+            PartyBookNativeTest.click(f, a, learn); PartyBookNativeTest.click(f, a, learn);
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            PartyBookNativeTest.click(f, a, abilityButton(a, "[3]", "frost_shard"));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var storage = (games.dmg.fantasystick.persistence.CharacterStorage)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            var assigned = storage.find(a.core.record.id()).get().orElseThrow();
+            assertEquals(BigInteger.valueOf(39), assigned.unspentPoints());
+            assertTrue(assigned.learned().contains("frost_shard"));
+            assertEquals("frost_shard", assigned.loadout().getFirst());
+            assertEquals(org.bukkit.Material.PRISMARINE_SHARD, a.core.inventory.getItem(2).getType());
+
+            when(a.world.getUID()).thenReturn(java.util.UUID.randomUUID());
+            var eye = new org.bukkit.Location(a.world, 0, 65.6, 0);
+            eye.setDirection(new org.bukkit.util.Vector(1, 0, 0));
+            doReturn(eye).when(a.player).getEyeLocation();
+            var projectile = projectile(a, new org.bukkit.Location(a.world, 10, 65.6, 0));
+            doAnswer(call -> {
+                f.dispatcher.accept(new org.bukkit.event.entity.ProjectileLaunchEvent(projectile));
+                return projectile;
+            }).when(a.player).launchProjectile(eq(org.bukkit.entity.Snowball.class), any(org.bukkit.util.Vector.class));
+            a.core.inventory.getInventory().setSelectedSlot(2);
+            var cast = new org.bukkit.event.player.PlayerInteractEvent(a.player,
+                org.bukkit.event.block.Action.RIGHT_CLICK_AIR, a.core.inventory.getItem(2), null,
+                org.bukkit.block.BlockFace.SELF, org.bukkit.inventory.EquipmentSlot.HAND);
+            f.dispatcher.accept(cast); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            assertEquals(org.bukkit.event.Event.Result.DENY, cast.useItemInHand());
+            verify(a.player).launchProjectile(eq(org.bukkit.entity.Snowball.class), any(org.bukkit.util.Vector.class));
+            var frost = FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "frostShard");
+            assertEquals(1, ((java.util.Map<?, ?>) FantasyStickLifecycleNativeTest.Fixture.field(frost, "projectiles")).size());
+
+            var target = mock(org.bukkit.entity.LivingEntity.class);
+            when(target.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+            when(target.getType()).thenReturn(org.bukkit.entity.EntityType.ZOMBIE);
+            when(target.getLocation()).thenReturn(new org.bukkit.Location(a.world, 10, 65.6, 0));
+            when(target.addPotionEffect(any())).thenReturn(true);
+            var damages = new java.util.ArrayList<org.bukkit.event.entity.EntityDamageByEntityEvent>();
+            doAnswer(call -> {
+                var source = (org.bukkit.damage.DamageSource) call.getArgument(1);
+                var event = new org.bukkit.event.entity.EntityDamageByEntityEvent(projectile, target,
+                    org.bukkit.event.entity.EntityDamageEvent.DamageCause.PROJECTILE, source,
+                    (Double) call.getArgument(0));
+                damages.add(event); f.dispatcher.accept(event); return null;
+            }).when(target).damage(anyDouble(), any(org.bukkit.damage.DamageSource.class));
+            var hit = new org.bukkit.event.entity.ProjectileHitEvent(projectile, target);
+            f.dispatcher.accept(hit);
+            assertFalse(hit.isCancelled(), "Eligible hostile Frost Shard hit was unexpectedly cancelled");
+            assertEquals(1, damages.size()); assertEquals(5.0, damages.getFirst().getDamage());
+            var effect = org.mockito.ArgumentCaptor.forClass(org.bukkit.potion.PotionEffect.class);
+            verify(target).addPotionEffect(effect.capture());
+            assertEquals(org.bukkit.potion.PotionEffectType.SLOWNESS, effect.getValue().getType());
+            assertEquals(40, effect.getValue().getDuration()); assertEquals(0, effect.getValue().getAmplifier());
+            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(),
+                "Accepted Frost Shard damage is attributed to the originating character");
+            assertNotNull(storage.find(a.core.record.id()).get().orElseThrow().cooldowns().get("frost_shard"));
+            f.dispatcher.accept(new org.bukkit.event.entity.ProjectileHitEvent(projectile, target));
+            assertEquals(1, damages.size());
+            verify(projectile, atLeastOnce()).remove();
+        }
+    }
+
+    @Test void partyMixedModeAndCancelledDamageApplyNeitherDamageNorSlow() throws Exception {
+        java.nio.file.Files.writeString(data.resolve("config.yml"), "frost-shard-cooldown-seconds: 0\n");
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); var b = new FantasyStickLifecycleNativeTest.Actor(data);
+            withFrostShard(data, a, 12, 10);
+            f.players.put(a.core.id, a.player); f.players.put(b.core.id, b.player); f.activate(a); f.activate(b);
+            var parties = PartyLifecycleNativeTest.parties(f); var party = parties.create(a.core.id).orElseThrow();
+            assertTrue(parties.accept(b.core.id, parties.invite(a.core.id, party.id(), b.core.id).orElseThrow().id()));
+            when(a.world.getUID()).thenReturn(java.util.UUID.randomUUID());
+            var first = projectile(a, new org.bukkit.Location(a.world, 2, 65.6, 0));
+            var second = projectile(a, new org.bukkit.Location(a.world, 2, 65.6, 0));
+            var third = projectile(a, new org.bukkit.Location(a.world, 2, 65.6, 0));
+            prepareLaunches(f, a, first, second, third);
+
+            cast(f, a); var partyHit = new org.bukkit.event.entity.ProjectileHitEvent(first, b.player); f.dispatcher.accept(partyHit);
+            assertTrue(partyHit.isCancelled()); verify(b.player, never()).damage(anyDouble(), any(org.bukkit.damage.DamageSource.class));
+            var ordinary = mock(org.bukkit.entity.Player.class); when(ordinary.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+            cast(f, a); var ordinaryHit = new org.bukkit.event.entity.ProjectileHitEvent(second, ordinary); f.dispatcher.accept(ordinaryHit);
+            assertTrue(ordinaryHit.isCancelled()); verify(ordinary, never()).damage(anyDouble(), any(org.bukkit.damage.DamageSource.class));
+
+            var target = mock(org.bukkit.entity.LivingEntity.class); when(target.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+            when(target.getLocation()).thenReturn(new org.bukkit.Location(a.world, 2, 65.6, 0));
+            doAnswer(call -> {
+                var source = (org.bukkit.damage.DamageSource) call.getArgument(1);
+                var event = new org.bukkit.event.entity.EntityDamageByEntityEvent(third, target,
+                    org.bukkit.event.entity.EntityDamageEvent.DamageCause.PROJECTILE, source, (Double) call.getArgument(0));
+                event.setCancelled(true); f.dispatcher.accept(event); return null;
+            }).when(target).damage(anyDouble(), any(org.bukkit.damage.DamageSource.class));
+            cast(f, a); f.dispatcher.accept(new org.bukkit.event.entity.ProjectileHitEvent(third, target));
+            verify(target, never()).addPotionEffect(any());
+        }
+    }
+
+    @Test void rangeLifetimeAndSessionEndRemoveOwnedProjectilesWithoutLateDamage() throws Exception {
+        java.nio.file.Files.writeString(data.resolve("config.yml"), "frost-shard-cooldown-seconds: 0\n");
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); withFrostShard(data, a, 12, 10);
+            f.players.put(a.core.id, a.player); f.activate(a); when(a.world.getUID()).thenReturn(java.util.UUID.randomUUID());
+            var outside = projectile(a, new org.bukkit.Location(a.world, 32.01, 65.6, 0));
+            var boundary = projectile(a, new org.bukkit.Location(a.world, 32, 65.6, 0));
+            var expiring = projectile(a, new org.bukkit.Location(a.world, 1, 65.6, 0));
+            var exiting = projectile(a, new org.bukkit.Location(a.world, 1, 65.6, 0));
+            prepareLaunches(f, a, outside, boundary, expiring, exiting);
+            var target = mock(org.bukkit.entity.LivingEntity.class); when(target.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+            when(target.addPotionEffect(any())).thenReturn(true);
+            var damages = new java.util.concurrent.atomic.AtomicInteger();
+            doAnswer(call -> {
+                damages.incrementAndGet();
+                var source = call.getArgument(1, org.bukkit.damage.DamageSource.class);
+                var projectile = source.getDirectEntity();
+                f.dispatcher.accept(new org.bukkit.event.entity.EntityDamageByEntityEvent(projectile, target,
+                    org.bukkit.event.entity.EntityDamageEvent.DamageCause.PROJECTILE, source, (Double) call.getArgument(0)));
+                return null;
+            }).when(target).damage(anyDouble(), any(org.bukkit.damage.DamageSource.class));
+
+            cast(f, a); f.dispatcher.accept(new org.bukkit.event.entity.ProjectileHitEvent(outside, target));
+            assertEquals(0, damages.get()); verify(outside, atLeastOnce()).remove();
+            cast(f, a); f.dispatcher.accept(new org.bukkit.event.entity.ProjectileHitEvent(boundary, target));
+            assertEquals(1, damages.get());
+            cast(f, a); f.delayed.getLast().run(); verify(expiring, atLeastOnce()).remove();
+            f.dispatcher.accept(new org.bukkit.event.entity.ProjectileHitEvent(expiring, target)); assertEquals(1, damages.get());
+            cast(f, a); a.core.inventory.setItemInOffHand(null); f.changed(a);
+            PartyBookNativeTest.drain(f); f.awaitCharacterAndReceipt(a);
+            ((games.dmg.fantasystick.ability.AbilityEngine) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "abilityEngine")).sweep();
+            verify(exiting, atLeastOnce()).remove();
+        }
+    }
+
+    @Test void unlearnRelearnAndTransferRetainCooldownAndClearOwnedProjectile() throws Exception {
+        java.nio.file.Files.writeString(data.resolve("config.yml"), "frost-shard-cooldown-seconds: 60\n");
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); withStats(data, a, 12, 10);
+            f.players.put(a.core.id, a.player); f.activate(a); learnAndAssign(f, a);
+            when(a.world.getUID()).thenReturn(java.util.UUID.randomUUID());
+            var projectile = projectile(a, new org.bukkit.Location(a.world, 2, 65.6, 0)); prepareLaunches(f, a, projectile);
+            cast(f, a);
+            var storage = (games.dmg.fantasystick.persistence.CharacterStorage)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            var deadline = storage.find(a.core.record.id()).get().orElseThrow().cooldowns().get("frost_shard");
+            assertNotNull(deadline);
+
+            a.core.inventory.getInventory().setSelectedSlot(0); PartyBookNativeTest.open(f, a);
+            var unlearn = abilityButton(a, "[Unlearn]", "frost_shard");
+            PartyBookNativeTest.click(f, a, unlearn); PartyBookNativeTest.click(f, a, unlearn);
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var refunded = storage.find(a.core.record.id()).get().orElseThrow();
+            assertEquals(BigInteger.valueOf(40), refunded.unspentPoints());
+            assertFalse(refunded.learned().contains("frost_shard"));
+            assertTrue(refunded.loadout().stream().noneMatch("frost_shard"::equals));
+            assertEquals(deadline, refunded.cooldowns().get("frost_shard"));
+            verify(projectile, atLeastOnce()).remove();
+
+            learnAndAssign(f, a); cast(f, a);
+            verify(a.player, times(1)).launchProjectile(eq(org.bukkit.entity.Snowball.class), any(org.bukkit.util.Vector.class));
+            assertTrue(a.messages.stream().anyMatch(message -> message.contains("ready in")));
+            var sheet = a.core.inventory.getItemInOffHand().clone();
+            a.core.inventory.setItemInOffHand(null); f.changed(a); PartyBookNativeTest.drain(f); f.awaitCharacterAndReceipt(a);
+            var b = new FantasyStickLifecycleNativeTest.Actor(data); b.core.inventory.setItemInOffHand(sheet);
+            f.players.put(b.core.id, b.player); f.activate(b); cast(f, b);
+            verify(b.player, never()).launchProjectile(eq(org.bukkit.entity.Snowball.class), any(org.bukkit.util.Vector.class));
+            assertTrue(b.messages.stream().anyMatch(message -> message.contains("ready in")));
+            assertEquals(deadline, storage.find(a.core.record.id()).get().orElseThrow().cooldowns().get("frost_shard"));
+        }
+    }
+
+    @Test void failedCooldownPersistenceLaunchesNoProjectileOrSlow() {
+        var storage = mock(games.dmg.fantasystick.persistence.CharacterStorage.class);
+        var sessions = mock(games.dmg.fantasystick.session.EquipmentSessions.class);
+        var parties = new games.dmg.fantasystick.party.PartyRoster(java.time.Clock.systemUTC(), ignored -> true);
+        var registry = new games.dmg.fantasystick.ability.AbilityRegistry();
+        var frost = new games.dmg.fantasystick.ability.FrostShard(
+            games.dmg.fantasystick.ability.FrostShard.Settings.defaults()); registry.register(frost.definition());
+        var base = new games.dmg.fantasystick.crafting.CharacterFactory().create(
+            games.dmg.fantasystick.progression.ProgressionRules.defaults());
+        var stats = new java.util.EnumMap<>(base.stats());
+        stats.put(games.dmg.fantasystick.progression.Stat.INT, BigInteger.valueOf(12));
+        stats.put(games.dmg.fantasystick.progression.Stat.WIS, BigInteger.TEN);
+        var record = new games.dmg.fantasystick.persistence.CharacterRecord(base.id(), base.name(), base.revision(), stats,
+            base.level(), base.experience(), base.unspentPoints(), base.health(), java.util.Set.of("frost_shard"),
+            java.util.List.of("frost_shard", "", "", "", "", "", ""), base.cooldowns(), base.restrictedKills(),
+            false, null, null);
+        var active = new games.dmg.fantasystick.session.EquipmentSessions.Active(java.util.UUID.randomUUID(),
+            java.util.UUID.randomUUID(), record.id());
+        var player = mock(org.bukkit.entity.Player.class);
+        when(sessions.current(active)).thenReturn(true); when(sessions.currentRecord(active)).thenReturn(java.util.Optional.of(record));
+        var failed = new java.util.concurrent.CompletableFuture<games.dmg.fantasystick.persistence.CharacterStorage.AbilityMutation>();
+        failed.completeExceptionally(new java.io.IOException("simulated Frost Shard cooldown failure"));
+        when(storage.commitAbilityCooldown(eq(record.id()), eq(record.revision()), eq("frost_shard"), any())).thenReturn(failed);
+        var failures = new java.util.ArrayList<games.dmg.fantasystick.ability.AbilityEngine.Failure>();
+        var engine = new games.dmg.fantasystick.ability.AbilityEngine(registry, storage, sessions, parties,
+            java.time.Clock.systemUTC(), Runnable::run, (delay, action) -> () -> {}, ignored -> {}, failures::add);
+        engine.accept(new games.dmg.fantasystick.session.ControlInput(player, active, 2, "frost_shard",
+            games.dmg.fantasystick.session.ControlInput.Kind.ABILITY,
+            games.dmg.fantasystick.session.ControlInput.Gesture.USE, null, 0, 0, () -> true));
+        verify(player, never()).launchProjectile(eq(org.bukkit.entity.Snowball.class), any(org.bukkit.util.Vector.class));
+        assertEquals(1, failures.size()); engine.close(); frost.close(); parties.close();
+    }
+
+    @Test void configuredDefinitionAndFormulaPreserveReviewedFiniteUncappedScaling() throws Exception {
+        java.nio.file.Files.writeString(data.resolve("config.yml"),
+            "frost-shard-base-damage: 9\nfrost-shard-cooldown-seconds: 2.5\n"
+                + "frost-shard-range-blocks: 40\nfrost-shard-lifetime-seconds: 7\n"
+                + "frost-shard-projectile-speed-blocks-per-tick: 2\n"
+                + "frost-shard-slowness-amplifier: 2\nfrost-shard-slowness-duration-seconds: 3\n");
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var registry = (games.dmg.fantasystick.ability.AbilityRegistry)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "abilityRegistry");
+            var definition = registry.find("frost_shard").orElseThrow();
+            assertEquals(java.time.Duration.ofMillis(2500), definition.cooldown());
+            assertEquals(new java.math.BigDecimal("9"), definition.parameters().get("base-damage"));
+            assertEquals(0, new java.math.BigDecimal("40").compareTo(definition.parameters().get("range")));
+            assertEquals(0, new java.math.BigDecimal("7").compareTo(definition.parameters().get("lifetime")));
+            assertEquals(0, new java.math.BigDecimal("2").compareTo(definition.parameters().get("projectile-speed")));
+            assertEquals(0, new java.math.BigDecimal("2").compareTo(definition.parameters().get("slowness-amplifier")));
+            assertEquals(0, new java.math.BigDecimal("3").compareTo(definition.parameters().get("slowness-duration")));
+            var unavailable = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(unavailable.core.id, unavailable.player); f.activate(unavailable);
+            unavailable.core.inventory.getInventory().setSelectedSlot(0); PartyBookNativeTest.open(f, unavailable);
+            assertTrue(PartyBookNativeTest.text(unavailable).replaceAll("\\s+", "")
+                .contains("Unavailable:requirements"));
+            assertThrows(AssertionError.class, () -> abilityButton(unavailable, "[Learn]", "frost_shard"));
+        }
+        assertEquals(BigInteger.valueOf(4), games.dmg.fantasystick.ability.FrostShard.damage(BigInteger.TEN));
+        assertEquals(BigInteger.valueOf(5), games.dmg.fantasystick.ability.FrostShard.damage(BigInteger.valueOf(12)));
+        assertEquals(BigInteger.TEN.pow(500).subtract(BigInteger.TEN).divide(BigInteger.TWO).add(BigInteger.valueOf(4)),
+            games.dmg.fantasystick.ability.FrostShard.damage(BigInteger.TEN.pow(500)));
+    }
+
+    @Test void invalidPackagedFrostSettingsFailBeforeInstallingGameplay() throws Exception {
+        for (String configuration : java.util.List.of("frost-shard-base-damage: -1\n",
+                "frost-shard-cooldown-seconds: 31536001\n", "frost-shard-range-blocks: 0\n",
+                "frost-shard-lifetime-seconds: 0\n", "frost-shard-projectile-speed-blocks-per-tick: 0\n",
+                "frost-shard-slowness-amplifier: 256\n", "frost-shard-slowness-duration-seconds: 0\n")) {
+            var directory = data.resolve(Integer.toHexString(configuration.hashCode()));
+            java.nio.file.Files.createDirectories(directory); java.nio.file.Files.writeString(directory.resolve("config.yml"), configuration);
+            try (var f = new FantasyStickLifecycleNativeTest.Fixture(directory)) {
+                assertThrows(IllegalArgumentException.class, () -> f.plugin.setEnabled(true));
+                assertTrue(f.order.isEmpty()); assertTrue(f.recipes.isEmpty());
+                assertFalse(java.nio.file.Files.exists(directory.resolve("characters")));
+            }
+        }
+    }
+
+    @Test void sourceExitRemovesOnlyOwnedSlowAndRestoresThePriorNativeLayer() throws Exception {
+        java.nio.file.Files.writeString(data.resolve("config.yml"), "frost-shard-cooldown-seconds: 0\n");
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); withFrostShard(data, a, 12, 10);
+            f.players.put(a.core.id, a.player); f.activate(a);
+            when(a.world.getUID()).thenReturn(java.util.UUID.randomUUID());
+            var eye = new org.bukkit.Location(a.world, 0, 65.6, 0); eye.setDirection(new org.bukkit.util.Vector(1, 0, 0));
+            doReturn(eye).when(a.player).getEyeLocation();
+            var projectile = projectile(a, new org.bukkit.Location(a.world, 2, 65.6, 0));
+            doAnswer(call -> { f.dispatcher.accept(new org.bukkit.event.entity.ProjectileLaunchEvent(projectile)); return projectile; })
+                .when(a.player).launchProjectile(eq(org.bukkit.entity.Snowball.class), any(org.bukkit.util.Vector.class));
+            var target = mock(org.bukkit.entity.LivingEntity.class);
+            when(target.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+            when(target.getLocation()).thenReturn(new org.bukkit.Location(a.world, 2, 65.6, 0));
+            var previous = new org.bukkit.potion.PotionEffect(org.bukkit.potion.PotionEffectType.SLOWNESS, 200, 1);
+            var current = new java.util.concurrent.atomic.AtomicReference<org.bukkit.potion.PotionEffect>(previous);
+            when(target.getPotionEffect(org.bukkit.potion.PotionEffectType.SLOWNESS)).thenAnswer(call -> current.get());
+            when(target.addPotionEffect(any())).thenAnswer(call -> { current.set(call.getArgument(0)); return true; });
+            doAnswer(call -> { current.set(null); return null; }).when(target)
+                .removePotionEffect(org.bukkit.potion.PotionEffectType.SLOWNESS);
+            doAnswer(call -> {
+                var source = (org.bukkit.damage.DamageSource) call.getArgument(1);
+                f.dispatcher.accept(new org.bukkit.event.entity.EntityDamageByEntityEvent(projectile, target,
+                    org.bukkit.event.entity.EntityDamageEvent.DamageCause.PROJECTILE, source,
+                    (Double) call.getArgument(0))); return null;
+            }).when(target).damage(anyDouble(), any(org.bukkit.damage.DamageSource.class));
+            a.core.inventory.getInventory().setSelectedSlot(2);
+            f.dispatcher.accept(new org.bukkit.event.player.PlayerInteractEvent(a.player,
+                org.bukkit.event.block.Action.RIGHT_CLICK_AIR, a.core.inventory.getItem(2), null,
+                org.bukkit.block.BlockFace.SELF, org.bukkit.inventory.EquipmentSlot.HAND));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            f.dispatcher.accept(new org.bukkit.event.entity.ProjectileHitEvent(projectile, target));
+            assertEquals(0, current.get().getAmplifier());
+            a.core.inventory.setItemInOffHand(null); f.changed(a); PartyBookNativeTest.drain(f); f.awaitCharacterAndReceipt(a);
+            ((games.dmg.fantasystick.ability.AbilityEngine) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "abilityEngine")).sweep();
+            assertNotNull(current.get()); assertEquals(1, current.get().getAmplifier());
+            assertTrue(current.get().getDuration() > 0 && current.get().getDuration() <= 200);
+        }
+    }
+
+    @Test void reenableWaitsForAcceptedFrostConfigurationBeforeInstallingGameplay() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var settings = FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "frostShardSettings");
+            var worker = (java.util.concurrent.ExecutorService) FantasyStickLifecycleNativeTest.Fixture.field(settings, "worker");
+            var entered = new java.util.concurrent.CountDownLatch(1); var release = new java.util.concurrent.CountDownLatch(1);
+            worker.execute(() -> {
+                entered.countDown();
+                try { release.await(5, java.util.concurrent.TimeUnit.SECONDS); }
+                catch (InterruptedException failure) { Thread.currentThread().interrupt(); }
+            });
+            try {
+                assertTrue(entered.await(5, java.util.concurrent.TimeUnit.SECONDS));
+                var sender = new EquipmentAdminCommandNativeTest.Sender();
+                f.command.execute(sender.port, "fantasystick", new String[]{"config", "frost-shard-base-damage", "9"});
+                f.plugin.setEnabled(false); f.plugin.setEnabled(true);
+                assertNull(FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "sessions"));
+                release.countDown(); f.tick();
+                var registry = (games.dmg.fantasystick.ability.AbilityRegistry)
+                    FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "abilityRegistry");
+                assertEquals(new java.math.BigDecimal("9"), registry.find("frost_shard").orElseThrow()
+                    .parameters().get("base-damage"));
+            } finally { release.countDown(); }
+        }
+    }
+
+    @Test void failedAdminPersistenceLeavesTheEffectiveDefinitionAndExternalFileUnchanged() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var outside = data.resolveSibling(data.getFileName() + "-frost-outside");
+            java.nio.file.Files.writeString(outside, "untouched\n");
+            java.nio.file.Files.createSymbolicLink(data.resolve("config.yml"), outside);
+            var sender = new EquipmentAdminCommandNativeTest.Sender();
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "frost-shard-base-damage", "9"});
+            var response = f.tasks.poll(5, java.util.concurrent.TimeUnit.SECONDS); assertNotNull(response); response.run();
+            assertTrue(sender.messages.getLast().contains("save failed"));
+            var registry = (games.dmg.fantasystick.ability.AbilityRegistry)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "abilityRegistry");
+            assertEquals(new java.math.BigDecimal("4"), registry.find("frost_shard").orElseThrow()
+                .parameters().get("base-damage"));
+            assertEquals("untouched\n", java.nio.file.Files.readString(outside));
+            java.nio.file.Files.delete(data.resolve("config.yml")); java.nio.file.Files.delete(outside);
+        }
+    }
+
+    @Test void acknowledgedUpdatesAffectFutureCastsButNotAnActiveProjectileSnapshot() throws Exception {
+        java.nio.file.Files.writeString(data.resolve("config.yml"), "frost-shard-cooldown-seconds: 0\n");
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); withFrostShard(data, a, 12, 10);
+            f.players.put(a.core.id, a.player); f.activate(a); when(a.world.getUID()).thenReturn(java.util.UUID.randomUUID());
+            var oldProjectile = projectile(a, new org.bukkit.Location(a.world, 2, 65.6, 0));
+            var newProjectile = projectile(a, new org.bukkit.Location(a.world, 2, 65.6, 0));
+            prepareLaunches(f, a, oldProjectile, newProjectile); cast(f, a);
+
+            var sender = new EquipmentAdminCommandNativeTest.Sender();
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "frost-shard-base-damage", "9"});
+            var response = f.tasks.poll(5, java.util.concurrent.TimeUnit.SECONDS); assertNotNull(response); response.run();
+            var target = mock(org.bukkit.entity.LivingEntity.class); when(target.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+            when(target.getLocation()).thenReturn(new org.bukkit.Location(a.world, 2, 65.6, 0)); when(target.addPotionEffect(any())).thenReturn(true);
+            var damages = new java.util.ArrayList<Double>();
+            doAnswer(call -> {
+                damages.add(call.getArgument(0)); var source = call.getArgument(1, org.bukkit.damage.DamageSource.class);
+                f.dispatcher.accept(new org.bukkit.event.entity.EntityDamageByEntityEvent(source.getDirectEntity(), target,
+                    org.bukkit.event.entity.EntityDamageEvent.DamageCause.PROJECTILE, source, (Double) call.getArgument(0)));
+                return null;
+            }).when(target).damage(anyDouble(), any(org.bukkit.damage.DamageSource.class));
+            f.dispatcher.accept(new org.bukkit.event.entity.ProjectileHitEvent(oldProjectile, target));
+            cast(f, a); f.dispatcher.accept(new org.bukkit.event.entity.ProjectileHitEvent(newProjectile, target));
+            assertEquals(java.util.List.of(5.0, 10.0), damages);
+        }
+    }
+
+    @Test void administratorCanReadUpdateAndCompleteEveryFrostShardSetting() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var sender = new EquipmentAdminCommandNativeTest.Sender();
+            assertEquals(java.util.List.of("frost-shard-base-damage"),
+                f.command.tabComplete(sender.port, "fantasystick", new String[]{"config", "frost-shard-b"}));
+            assertEquals(java.util.List.of("frost-shard-base-damage", "frost-shard-cooldown-seconds",
+                "frost-shard-lifetime-seconds", "frost-shard-projectile-speed-blocks-per-tick",
+                "frost-shard-range-blocks", "frost-shard-slowness-amplifier",
+                "frost-shard-slowness-duration-seconds"),
+                f.command.tabComplete(sender.port, "fantasystick", new String[]{"config", "frost-shard-"}));
+            assertEquals(java.util.List.of("4"), f.command.tabComplete(sender.port, "fantasystick",
+                new String[]{"config", "frost-shard-base-damage", ""}));
+            assertTrue(f.command.tabComplete(sender.port, "fantasystick", new String[]{"config", "unknown"}).isEmpty());
+            sender.allowed = false;
+            assertTrue(f.command.tabComplete(sender.port, "fantasystick", new String[]{"config", "frost"}).isEmpty());
+            sender.allowed = true;
+
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "frost-shard-base-damage"});
+            assertTrue(sender.messages.getLast().contains("frost-shard-base-damage=4"));
+            sender.messages.clear();
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "frost-shard-base-damage", "9"});
+            assertTrue(sender.messages.isEmpty(), "Do not publish settings before durable acknowledgment");
+            var response = f.tasks.poll(5, java.util.concurrent.TimeUnit.SECONDS); assertNotNull(response); response.run();
+            assertTrue(sender.messages.getLast().contains("frost-shard-base-damage=9"));
+            var registry = (games.dmg.fantasystick.ability.AbilityRegistry)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "abilityRegistry");
+            assertEquals(new java.math.BigDecimal("9"), registry.find("frost_shard").orElseThrow()
+                .parameters().get("base-damage"));
+            var saved = (java.util.Map<?, ?>) new org.yaml.snakeyaml.Yaml().load(
+                java.nio.file.Files.readString(data.resolve("config.yml")));
+            assertEquals("9", String.valueOf(saved.get("frost-shard-base-damage")));
+
+            for (String invalid : java.util.List.of("-1", "1.5", "nope")) {
+                f.command.execute(sender.port, "fantasystick",
+                    new String[]{"config", "frost-shard-base-damage", invalid});
+                assertTrue(sender.messages.getLast().contains("invalid"));
+            }
+            assertEquals(new java.math.BigDecimal("9"), registry.find("frost_shard").orElseThrow()
+                .parameters().get("base-damage"));
+            f.plugin.setEnabled(false); f.plugin.setEnabled(true);
+            var reloaded = (games.dmg.fantasystick.ability.AbilityRegistry)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "abilityRegistry");
+            assertEquals(new java.math.BigDecimal("9"), reloaded.find("frost_shard").orElseThrow()
+                .parameters().get("base-damage"));
+            sender.messages.clear();
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "frost-shard-base-damage"});
+            assertTrue(sender.messages.getLast().contains("=9"));
+        }
+    }
+
+    private static void learnAndAssign(FantasyStickLifecycleNativeTest.Fixture fixture,
+                                       FantasyStickLifecycleNativeTest.Actor actor) throws Exception {
+        actor.core.inventory.getInventory().setSelectedSlot(0); PartyBookNativeTest.open(fixture, actor);
+        PartyBookNativeTest.click(fixture, actor, abilityButton(actor, "[Learn]", "frost_shard"));
+        PartyBookNativeTest.drain(fixture); PartyBookNativeTest.drain(fixture);
+        PartyBookNativeTest.click(fixture, actor, abilityButton(actor, "[3]", "frost_shard"));
+        PartyBookNativeTest.drain(fixture); PartyBookNativeTest.drain(fixture);
+    }
+
+    private static void cast(FantasyStickLifecycleNativeTest.Fixture fixture,
+                             FantasyStickLifecycleNativeTest.Actor actor) throws Exception {
+        actor.core.inventory.getInventory().setSelectedSlot(2);
+        fixture.dispatcher.accept(new org.bukkit.event.player.PlayerInteractEvent(actor.player,
+            org.bukkit.event.block.Action.RIGHT_CLICK_AIR, actor.core.inventory.getItem(2), null,
+            org.bukkit.block.BlockFace.SELF, org.bukkit.inventory.EquipmentSlot.HAND));
+        PartyBookNativeTest.drain(fixture); PartyBookNativeTest.drain(fixture);
+    }
+
+    private static void prepareLaunches(FantasyStickLifecycleNativeTest.Fixture fixture,
+                                        FantasyStickLifecycleNativeTest.Actor actor,
+                                        org.bukkit.entity.Snowball... projectiles) {
+        var eye = new org.bukkit.Location(actor.world, 0, 65.6, 0);
+        eye.setDirection(new org.bukkit.util.Vector(1, 0, 0)); doReturn(eye).when(actor.player).getEyeLocation();
+        var queue = new java.util.ArrayDeque<>(java.util.List.of(projectiles));
+        doAnswer(call -> {
+            var projectile = queue.removeFirst(); fixture.dispatcher.accept(new org.bukkit.event.entity.ProjectileLaunchEvent(projectile));
+            return projectile;
+        }).when(actor.player).launchProjectile(eq(org.bukkit.entity.Snowball.class), any(org.bukkit.util.Vector.class));
+    }
+
+    private static net.minecraft.network.chat.ClickEvent.Custom abilityButton(
+            FantasyStickLifecycleNativeTest.Actor actor, String label, String ability) {
+        var book = org.bukkit.craftbukkit.inventory.CraftItemStack.asNMSCopy(actor.books.getLast())
+            .get(net.minecraft.core.component.DataComponents.WRITTEN_BOOK_CONTENT);
+        assertNotNull(book);
+        for (var page : book.pages()) {
+            var found = abilityButton(page.raw(), label, ability);
+            if (found != null) return found;
+        }
+        throw new AssertionError("Missing " + label + " action for " + ability);
+    }
+
+    private static net.minecraft.network.chat.ClickEvent.Custom abilityButton(
+            net.minecraft.network.chat.Component component, String label, String ability) {
+        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(":" + ability)) return custom;
+        for (var child : component.getSiblings()) {
+            var found = abilityButton(child, label, ability);
+            if (found != null) return found;
+        }
+        return null;
+    }
+
+    private static void withFrostShard(Path data, FantasyStickLifecycleNativeTest.Actor actor,
+                                       int intelligence, int wisdom) 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));
+        stats.put(games.dmg.fantasystick.progression.Stat.WIS, BigInteger.valueOf(wisdom));
+        repository.replace(new games.dmg.fantasystick.persistence.CharacterRecord(old.id(), old.name(),
+            old.revision().add(BigInteger.ONE), stats, old.level(), old.experience(), old.unspentPoints(), old.health(),
+            java.util.Set.of("frost_shard"), java.util.List.of("frost_shard", "", "", "", "", "", ""),
+            old.cooldowns(), old.restrictedKills(), false, null, null), old.revision());
+    }
+
+    private static void withStats(Path data, FantasyStickLifecycleNativeTest.Actor actor,
+                                  int intelligence, int wisdom) 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));
+        stats.put(games.dmg.fantasystick.progression.Stat.WIS, BigInteger.valueOf(wisdom));
+        repository.replace(new games.dmg.fantasystick.persistence.CharacterRecord(old.id(), old.name(),
+            old.revision().add(BigInteger.ONE), stats, old.level(), old.experience(), old.unspentPoints(), old.health(),
+            old.learned(), old.loadout(), old.cooldowns(), old.restrictedKills(), false, null, null), old.revision());
+    }
+
+    private static org.bukkit.entity.Snowball projectile(FantasyStickLifecycleNativeTest.Actor actor,
+                                                          org.bukkit.Location location) {
+        var projectile = mock(org.bukkit.entity.Snowball.class);
+        when(projectile.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+        when(projectile.getShooter()).thenReturn(actor.player);
+        when(projectile.getLocation()).thenAnswer(ignored -> location.clone());
+        when(projectile.getWorld()).thenReturn(location.getWorld());
+        when(projectile.getPersistentDataContainer()).thenReturn(
+            new org.bukkit.craftbukkit.persistence.CraftPersistentDataContainer(
+                new org.bukkit.craftbukkit.persistence.CraftPersistentDataTypeRegistry()));
+        return projectile;
+    }
+}

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

@@ -0,0 +1,369 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.ArgumentMatchers.*;
+import static org.mockito.Mockito.*;
+
+import java.math.BigInteger;
+import java.nio.file.Path;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class GreatSwordNativeTest {
+    @TempDir Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test void bookAcquisitionAndFullyChargedEquippedStrikeReplaceVanillaDamage() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            withStrength(data, a, 12);
+            f.players.put(a.core.id, a.player); f.activate(a);
+
+            a.core.inventory.getInventory().setSelectedSlot(0);
+            PartyBookNativeTest.open(f, a);
+            String book = PartyBookNativeTest.text(a);
+            assertTrue(book.contains("Great Sword"));
+            assertTrue(book.contains("STR 12"));
+            assertTrue(book.contains("1.2"));
+            var learn = abilityButton(a, "[Learn]", "great_sword");
+            PartyBookNativeTest.click(f, a, learn); PartyBookNativeTest.click(f, a, learn);
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            PartyBookNativeTest.click(f, a, abilityButton(a, "[3]", "great_sword"));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+
+            var storage = (games.dmg.fantasystick.persistence.CharacterStorage)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            var assigned = storage.find(a.core.record.id()).get().orElseThrow();
+            assertTrue(assigned.learned().contains("great_sword"));
+            assertEquals("great_sword", assigned.loadout().getFirst());
+            assertEquals(BigInteger.valueOf(39), assigned.unspentPoints());
+            assertEquals(org.bukkit.Material.WOODEN_SWORD, a.core.inventory.getItem(2).getType());
+
+            when(a.player.getAttackCooldown()).thenReturn(1.0f);
+            var target = mock(org.bukkit.entity.LivingEntity.class);
+            when(target.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+            when(target.getType()).thenReturn(org.bukkit.entity.EntityType.ZOMBIE);
+            when(a.world.getUID()).thenReturn(java.util.UUID.randomUUID());
+            when(target.getLocation()).thenReturn(new org.bukkit.Location(a.world, 4, 64, 0));
+            var damages = new java.util.ArrayList<org.bukkit.event.entity.EntityDamageByEntityEvent>();
+            doAnswer(call -> {
+                var source = (org.bukkit.damage.DamageSource) call.getArgument(1);
+                var event = new org.bukkit.event.entity.EntityDamageByEntityEvent(a.player, target,
+                    org.bukkit.event.entity.EntityDamageEvent.DamageCause.ENTITY_ATTACK, source,
+                    (Double) call.getArgument(0));
+                damages.add(event); f.dispatcher.accept(event); return null;
+            }).when(target).damage(anyDouble(), any(org.bukkit.damage.DamageSource.class));
+
+            a.core.inventory.getInventory().setSelectedSlot(2);
+            var before = java.time.Instant.now();
+            var attack = new io.papermc.paper.event.player.PrePlayerAttackEntityEvent(a.player, target, true);
+            f.dispatcher.accept(attack);
+            assertTrue(attack.isCancelled(), "The bound sword must never continue into vanilla damage");
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            assertEquals(1, damages.size());
+            assertEquals(8.0, damages.getFirst().getDamage());
+            assertSame(a.player, damages.getFirst().getDamager());
+            assertEquals(org.bukkit.damage.DamageType.PLAYER_ATTACK, damages.getFirst().getDamageSource().getDamageType());
+
+            var saved = storage.find(a.core.record.id()).get().orElseThrow();
+            var deadline = saved.cooldowns().get("great_sword");
+            assertNotNull(deadline);
+            assertFalse(deadline.isBefore(before.plusMillis(1200)));
+            assertFalse(deadline.isAfter(java.time.Instant.now().plusMillis(1200)));
+            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(),
+                "Accepted direct damage is attributed to the originating character");
+            f.dispatcher.accept(new io.papermc.paper.event.player.PrePlayerAttackEntityEvent(a.player, target, true));
+            PartyBookNativeTest.drain(f);
+            assertEquals(1, damages.size(), "The persisted recovery prevents a repeated strike");
+            assertTrue(a.messages.stream().anyMatch(message -> message.contains("ready in")));
+        }
+    }
+
+    @Test void partialChargeUsesTheApprovedNativeCurveWithoutVanillaContinuation() throws Exception {
+        java.nio.file.Files.writeString(data.resolve("config.yml"), "great-sword-recovery-seconds: 0\n");
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            withGreatSword(data, a, 12);
+            f.players.put(a.core.id, a.player); f.activate(a);
+            when(a.player.getAttackCooldown()).thenReturn(0.5f);
+            var target = mock(org.bukkit.entity.LivingEntity.class);
+            when(target.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+            var damages = new java.util.ArrayList<Double>();
+            doAnswer(call -> {
+                double amount = call.getArgument(0); damages.add(amount);
+                var source = (org.bukkit.damage.DamageSource) call.getArgument(1);
+                f.dispatcher.accept(new org.bukkit.event.entity.EntityDamageByEntityEvent(a.player, target,
+                    org.bukkit.event.entity.EntityDamageEvent.DamageCause.ENTITY_ATTACK, source, amount));
+                return null;
+            }).when(target).damage(anyDouble(), any(org.bukkit.damage.DamageSource.class));
+            a.core.inventory.getInventory().setSelectedSlot(2);
+            var attack = new io.papermc.paper.event.player.PrePlayerAttackEntityEvent(a.player, target, true);
+            f.dispatcher.accept(attack); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            assertTrue(attack.isCancelled());
+            assertEquals(java.util.List.of(3.2), damages);
+        }
+    }
+
+    @Test void refusedPlayersAndCancelledNativeDamagePreserveProtectionWithoutFreeVanillaHits() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            var b = new FantasyStickLifecycleNativeTest.Actor(data);
+            withGreatSword(data, a, 12);
+            f.players.put(a.core.id, a.player); f.players.put(b.core.id, b.player);
+            f.activate(a); f.activate(b);
+            var parties = PartyLifecycleNativeTest.parties(f);
+            var party = parties.create(a.core.id).orElseThrow();
+            assertTrue(parties.accept(b.core.id,
+                parties.invite(a.core.id, party.id(), b.core.id).orElseThrow().id()));
+            when(a.player.getAttackCooldown()).thenReturn(1.0f);
+            a.core.inventory.getInventory().setSelectedSlot(2);
+
+            var partyAttack = new io.papermc.paper.event.player.PrePlayerAttackEntityEvent(a.player, b.player, true);
+            f.dispatcher.accept(partyAttack); PartyBookNativeTest.drain(f);
+            assertTrue(partyAttack.isCancelled());
+            verify(b.player, never()).damage(anyDouble(), any(org.bukkit.damage.DamageSource.class));
+
+            var ordinary = mock(org.bukkit.entity.Player.class);
+            when(ordinary.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+            var ordinaryAttack = new io.papermc.paper.event.player.PrePlayerAttackEntityEvent(a.player, ordinary, true);
+            f.dispatcher.accept(ordinaryAttack); PartyBookNativeTest.drain(f);
+            assertTrue(ordinaryAttack.isCancelled());
+            verify(ordinary, never()).damage(anyDouble(), any(org.bukkit.damage.DamageSource.class));
+
+            var target = mock(org.bukkit.entity.LivingEntity.class);
+            when(target.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+            when(target.getType()).thenReturn(org.bukkit.entity.EntityType.ZOMBIE);
+            when(a.world.getUID()).thenReturn(java.util.UUID.randomUUID());
+            when(target.getLocation()).thenReturn(new org.bukkit.Location(a.world, 4, 64, 0));
+            var damage = new java.util.concurrent.atomic.AtomicReference<org.bukkit.event.entity.EntityDamageByEntityEvent>();
+            doAnswer(call -> {
+                var source = (org.bukkit.damage.DamageSource) call.getArgument(1);
+                var event = new org.bukkit.event.entity.EntityDamageByEntityEvent(a.player, target,
+                    org.bukkit.event.entity.EntityDamageEvent.DamageCause.ENTITY_ATTACK, source,
+                    (Double) call.getArgument(0));
+                event.setCancelled(true); damage.set(event); f.dispatcher.accept(event); return null;
+            }).when(target).damage(anyDouble(), any(org.bukkit.damage.DamageSource.class));
+            f.dispatcher.accept(new io.papermc.paper.event.player.PrePlayerAttackEntityEvent(a.player, target, true));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            assertNotNull(damage.get()); assertTrue(damage.get().isCancelled());
+            var storage = (games.dmg.fantasystick.persistence.CharacterStorage)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            assertNotNull(storage.find(a.core.record.id()).get().orElseThrow().cooldowns().get("great_sword"),
+                "An acknowledged recovery is not refunded by later native cancellation");
+            f.dispatcher.accept(new org.bukkit.event.entity.EntityDeathEvent(target, damage.get().getDamageSource(),
+                new java.util.ArrayList<>(), 0));
+            PartyBookNativeTest.drain(f);
+            assertEquals(BigInteger.ZERO, storage.find(a.core.record.id()).get().orElseThrow().experience());
+        }
+    }
+
+    @Test void unlearnRelearnAndWholeCharacterTransferRetainTheOriginalRecovery() throws Exception {
+        java.nio.file.Files.writeString(data.resolve("config.yml"), "great-sword-recovery-seconds: 60\n");
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); withStrength(data, a, 12);
+            f.players.put(a.core.id, a.player); f.activate(a);
+            learnAndAssign(f, a);
+            when(a.player.getAttackCooldown()).thenReturn(1.0f);
+            var target = mock(org.bukkit.entity.LivingEntity.class);
+            when(target.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+            var hits = new java.util.concurrent.atomic.AtomicInteger();
+            doAnswer(call -> {
+                hits.incrementAndGet();
+                var source = (org.bukkit.damage.DamageSource) call.getArgument(1);
+                f.dispatcher.accept(new org.bukkit.event.entity.EntityDamageByEntityEvent(a.player, target,
+                    org.bukkit.event.entity.EntityDamageEvent.DamageCause.ENTITY_ATTACK, source,
+                    (Double) call.getArgument(0))); return null;
+            }).when(target).damage(anyDouble(), any(org.bukkit.damage.DamageSource.class));
+            a.core.inventory.getInventory().setSelectedSlot(2);
+            f.dispatcher.accept(new io.papermc.paper.event.player.PrePlayerAttackEntityEvent(a.player, target, true));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            assertEquals(1, hits.get());
+            var storage = (games.dmg.fantasystick.persistence.CharacterStorage)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            var deadline = storage.find(a.core.record.id()).get().orElseThrow().cooldowns().get("great_sword");
+            assertNotNull(deadline);
+
+            a.core.inventory.getInventory().setSelectedSlot(0); PartyBookNativeTest.open(f, a);
+            var unlearn = abilityButton(a, "[Unlearn]", "great_sword");
+            PartyBookNativeTest.click(f, a, unlearn); PartyBookNativeTest.click(f, a, unlearn);
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var refunded = storage.find(a.core.record.id()).get().orElseThrow();
+            assertEquals(BigInteger.valueOf(40), refunded.unspentPoints());
+            assertFalse(refunded.learned().contains("great_sword"));
+            assertTrue(refunded.loadout().stream().noneMatch("great_sword"::equals));
+            assertEquals(deadline, refunded.cooldowns().get("great_sword"));
+            assertTrue(new games.dmg.fantasystick.items.SessionControls(
+                (games.dmg.fantasystick.ability.AbilityRegistry) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "abilityRegistry"))
+                .ability(a.core.inventory.getItem(2)).isEmpty());
+
+            learnAndAssign(f, a);
+            assertEquals(deadline, storage.find(a.core.record.id()).get().orElseThrow().cooldowns().get("great_sword"));
+            a.core.inventory.getInventory().setSelectedSlot(2);
+            f.dispatcher.accept(new io.papermc.paper.event.player.PrePlayerAttackEntityEvent(a.player, target, true));
+            PartyBookNativeTest.drain(f);
+            assertEquals(1, hits.get());
+            assertTrue(a.messages.stream().anyMatch(message -> message.contains("ready in")));
+
+            var sheet = a.core.inventory.getItemInOffHand().clone();
+            a.core.inventory.setItemInOffHand(null); f.changed(a); PartyBookNativeTest.drain(f); f.awaitCharacterAndReceipt(a);
+            var b = new FantasyStickLifecycleNativeTest.Actor(data); b.core.inventory.setItemInOffHand(sheet);
+            f.players.put(b.core.id, b.player); f.activate(b);
+            when(b.player.getAttackCooldown()).thenReturn(1.0f);
+            b.core.inventory.getInventory().setSelectedSlot(2);
+            f.dispatcher.accept(new io.papermc.paper.event.player.PrePlayerAttackEntityEvent(b.player, target, true));
+            PartyBookNativeTest.drain(f);
+            assertEquals(1, hits.get(), "Transfer cannot reset the character-bound recovery");
+            assertEquals(deadline, storage.find(a.core.record.id()).get().orElseThrow().cooldowns().get("great_sword"));
+        }
+    }
+
+    @Test void failedCooldownPersistenceDealsNoDamageOrFreeEffect() {
+        var storage = mock(games.dmg.fantasystick.persistence.CharacterStorage.class);
+        var sessions = mock(games.dmg.fantasystick.session.EquipmentSessions.class);
+        var parties = new games.dmg.fantasystick.party.PartyRoster(java.time.Clock.systemUTC(), ignored -> true);
+        var registry = new games.dmg.fantasystick.ability.AbilityRegistry();
+        var sword = new games.dmg.fantasystick.ability.GreatSword(
+            games.dmg.fantasystick.ability.GreatSword.Settings.defaults());
+        registry.register(sword.definition());
+        var base = new games.dmg.fantasystick.crafting.CharacterFactory().create(
+            games.dmg.fantasystick.progression.ProgressionRules.defaults());
+        var stats = new java.util.EnumMap<>(base.stats());
+        stats.put(games.dmg.fantasystick.progression.Stat.STR, BigInteger.valueOf(12));
+        var record = new games.dmg.fantasystick.persistence.CharacterRecord(base.id(), base.name(), base.revision(), stats,
+            base.level(), base.experience(), base.unspentPoints(), base.health(), java.util.Set.of("great_sword"),
+            java.util.List.of("great_sword", "", "", "", "", "", ""), base.cooldowns(), base.restrictedKills(),
+            false, null, null);
+        var active = new games.dmg.fantasystick.session.EquipmentSessions.Active(java.util.UUID.randomUUID(),
+            java.util.UUID.randomUUID(), record.id());
+        var player = mock(org.bukkit.entity.Player.class);
+        var target = mock(org.bukkit.entity.LivingEntity.class);
+        when(target.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+        when(sessions.current(active)).thenReturn(true);
+        when(sessions.currentRecord(active)).thenReturn(java.util.Optional.of(record));
+        var failed = new java.util.concurrent.CompletableFuture<games.dmg.fantasystick.persistence.CharacterStorage.AbilityMutation>();
+        failed.completeExceptionally(new java.io.IOException("simulated Great Sword cooldown failure"));
+        when(storage.commitAbilityCooldown(eq(record.id()), eq(record.revision()), eq("great_sword"), any()))
+            .thenReturn(failed);
+        var failures = new java.util.ArrayList<games.dmg.fantasystick.ability.AbilityEngine.Failure>();
+        var engine = new games.dmg.fantasystick.ability.AbilityEngine(registry, storage, sessions, parties,
+            java.time.Clock.systemUTC(), Runnable::run, (delay, action) -> () -> {}, ignored -> {}, failures::add);
+        engine.accept(new games.dmg.fantasystick.session.ControlInput(player, active, 2, "great_sword",
+            games.dmg.fantasystick.session.ControlInput.Kind.ABILITY,
+            games.dmg.fantasystick.session.ControlInput.Gesture.ATTACK, target, 0, 1, () -> true));
+        verify(target, never()).damage(anyDouble(), any(org.bukkit.damage.DamageSource.class));
+        assertEquals(1, failures.size());
+        engine.close(); sword.close(); parties.close();
+    }
+
+    @Test void invalidGreatSwordBalanceFailsBeforeInstallingGameplay() throws Exception {
+        for (String configuration : java.util.List.of("great-sword-base-damage: -1\n",
+                "great-sword-recovery-seconds: -0.1\n", "great-sword-recovery-seconds: 31536001\n",
+                "great-sword-recovery-seconds: 0.0000000001\n", "great-sword-base-damage: nope\n")) {
+            var directory = data.resolve(Integer.toHexString(configuration.hashCode()));
+            java.nio.file.Files.createDirectories(directory);
+            java.nio.file.Files.writeString(directory.resolve("config.yml"), configuration);
+            try (var fixture = new FantasyStickLifecycleNativeTest.Fixture(directory)) {
+                assertThrows(IllegalArgumentException.class, () -> fixture.plugin.setEnabled(true));
+                assertTrue(fixture.order.isEmpty()); assertTrue(fixture.recipes.isEmpty());
+                assertFalse(java.nio.file.Files.exists(directory.resolve("characters")));
+            }
+        }
+    }
+
+    @Test void configuredDefinitionAndChargeCurvePreserveExactUncappedScaling() throws Exception {
+        java.nio.file.Files.writeString(data.resolve("config.yml"),
+            "great-sword-base-damage: 9\ngreat-sword-recovery-seconds: 2.5\n");
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var registry = (games.dmg.fantasystick.ability.AbilityRegistry)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "abilityRegistry");
+            var definition = registry.find("great_sword").orElseThrow();
+            assertEquals(java.time.Duration.ofMillis(2500), definition.cooldown());
+            assertEquals(new java.math.BigDecimal("9"), definition.parameters().get("base-damage"));
+            assertEquals("Great Sword", definition.name());
+            assertEquals(org.bukkit.Material.WOODEN_SWORD, definition.icon());
+            assertEquals(java.util.Map.of(games.dmg.fantasystick.progression.Stat.STR, BigInteger.valueOf(12)),
+                definition.requirements());
+            assertEquals(games.dmg.fantasystick.session.ControlInput.Gesture.ATTACK, definition.gesture());
+            var unavailable = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(unavailable.core.id, unavailable.player); f.activate(unavailable);
+            unavailable.core.inventory.getInventory().setSelectedSlot(0); PartyBookNativeTest.open(f, unavailable);
+            String text = PartyBookNativeTest.text(unavailable);
+            assertTrue(text.contains("Great Sword"));
+            assertTrue(text.replaceAll("\\s+", "").contains("Unavailable:requirements"), text);
+            assertThrows(AssertionError.class, () -> abilityButton(unavailable, "[Learn]", "great_sword"));
+        }
+        assertEquals(new java.math.BigDecimal("8"),
+            games.dmg.fantasystick.ability.GreatSword.damage(BigInteger.valueOf(12), 1.0f));
+        assertEquals(new java.math.BigDecimal("3.2"),
+            games.dmg.fantasystick.ability.GreatSword.damage(BigInteger.valueOf(12), 0.5f));
+        assertEquals(new java.math.BigDecimal("1.6"),
+            games.dmg.fantasystick.ability.GreatSword.damage(BigInteger.valueOf(12), 0.0f));
+        assertEquals(new java.math.BigDecimal(BigInteger.TEN.pow(500).subtract(BigInteger.TEN)
+            .divide(BigInteger.TWO).add(BigInteger.valueOf(7))),
+            games.dmg.fantasystick.ability.GreatSword.damage(BigInteger.TEN.pow(500), 1.0f));
+    }
+
+    private static void learnAndAssign(FantasyStickLifecycleNativeTest.Fixture fixture,
+                                       FantasyStickLifecycleNativeTest.Actor actor) throws Exception {
+        actor.core.inventory.getInventory().setSelectedSlot(0); PartyBookNativeTest.open(fixture, actor);
+        PartyBookNativeTest.click(fixture, actor, abilityButton(actor, "[Learn]", "great_sword"));
+        PartyBookNativeTest.drain(fixture); PartyBookNativeTest.drain(fixture);
+        PartyBookNativeTest.click(fixture, actor, abilityButton(actor, "[3]", "great_sword"));
+        PartyBookNativeTest.drain(fixture); PartyBookNativeTest.drain(fixture);
+    }
+
+    private static net.minecraft.network.chat.ClickEvent.Custom abilityButton(
+            FantasyStickLifecycleNativeTest.Actor actor, String label, String ability) {
+        var book = org.bukkit.craftbukkit.inventory.CraftItemStack.asNMSCopy(actor.books.getLast())
+            .get(net.minecraft.core.component.DataComponents.WRITTEN_BOOK_CONTENT);
+        assertNotNull(book);
+        for (var page : book.pages()) {
+            var found = abilityButton(page.raw(), label, ability);
+            if (found != null) return found;
+        }
+        throw new AssertionError("Missing " + label + " action for " + ability);
+    }
+
+    private static net.minecraft.network.chat.ClickEvent.Custom abilityButton(
+            net.minecraft.network.chat.Component component, String label, String ability) {
+        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(":" + ability)) return custom;
+        for (var child : component.getSiblings()) {
+            var found = abilityButton(child, label, ability);
+            if (found != null) return found;
+        }
+        return null;
+    }
+
+    private static void withGreatSword(Path data, FantasyStickLifecycleNativeTest.Actor actor, int strength) 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.STR, BigInteger.valueOf(strength));
+        repository.replace(new games.dmg.fantasystick.persistence.CharacterRecord(old.id(), old.name(),
+            old.revision().add(BigInteger.ONE), stats, old.level(), old.experience(), old.unspentPoints(), old.health(),
+            java.util.Set.of("great_sword"), java.util.List.of("great_sword", "", "", "", "", "", ""),
+            old.cooldowns(), old.restrictedKills(), false, null, null), old.revision());
+    }
+
+    private static void withStrength(Path data, FantasyStickLifecycleNativeTest.Actor actor, int strength) 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.STR, BigInteger.valueOf(strength));
+        repository.replace(new games.dmg.fantasystick.persistence.CharacterRecord(old.id(), old.name(),
+            old.revision().add(BigInteger.ONE), stats, old.level(), old.experience(), old.unspentPoints(), old.health(),
+            old.learned(), old.loadout(), old.cooldowns(), old.restrictedKills(), false, null, null), old.revision());
+    }
+}

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

@@ -0,0 +1,479 @@
+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.persistence.CharacterRecord;
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import games.dmg.fantasystick.progression.Stat;
+import java.math.BigInteger;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.EnumMap;
+import java.util.List;
+import net.minecraft.network.chat.ClickEvent;
+import org.bukkit.Location;
+import org.bukkit.Material;
+import org.bukkit.damage.DamageSource;
+import org.bukkit.entity.AbstractArrow;
+import org.bukkit.entity.Arrow;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.event.entity.EntityDamageByEntityEvent;
+import org.bukkit.event.entity.EntityDamageEvent;
+import org.bukkit.event.entity.EntityDeathEvent;
+import org.bukkit.event.entity.ProjectileHitEvent;
+import org.bukkit.event.entity.ProjectileLaunchEvent;
+import org.bukkit.event.player.PlayerInteractEvent;
+import org.bukkit.inventory.EquipmentSlot;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.util.Vector;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+import org.mockito.ArgumentCaptor;
+
+class LongbowNativeTest {
+    @TempDir Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test void bookAcquisitionNativeDrawFullShotDamageAttributionAndPersistentRecovery() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); withStats(data, a, 0, 14);
+            f.players.put(a.core.id, a.player); f.activate(a);
+            a.core.inventory.getInventory().setSelectedSlot(0); PartyBookNativeTest.open(f, a);
+            String text = PartyBookNativeTest.text(a).replaceAll("\\s+", "");
+            assertTrue(text.contains("Longbow")); assertTrue(text.contains("DEX14"));
+            assertTrue(text.contains("Cost:1"), text); assertTrue(text.contains("Draw"), text);
+            assertTrue(text.contains("1s"), text);
+            PartyBookNativeTest.click(f, a, abilityButton(a, "[Learn]", "longbow"));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            PartyBookNativeTest.click(f, a, abilityButton(a, "[3]", "longbow"));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var storage = (CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            var learned = storage.find(a.core.record.id()).get().orElseThrow();
+            assertTrue(learned.learned().contains("longbow")); assertEquals("longbow", learned.loadout().getFirst());
+            assertEquals(BigInteger.valueOf(39), learned.unspentPoints());
+
+            when(a.world.getUID()).thenReturn(java.util.UUID.randomUUID());
+            var arrow = arrow(a, new Location(a.world, 6, 65.6, 0));
+            doAnswer(call -> { f.dispatcher.accept(new ProjectileLaunchEvent(arrow)); return arrow; })
+                .when(a.player).launchProjectile(eq(Arrow.class), any(Vector.class));
+            var target = mock(LivingEntity.class); when(target.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+            when(target.getType()).thenReturn(org.bukkit.entity.EntityType.ZOMBIE);
+            when(target.getLocation()).thenReturn(new Location(a.world, 6, 65.6, 0)); when(target.getWorld()).thenReturn(a.world);
+            var damages = new ArrayList<EntityDamageByEntityEvent>();
+            doAnswer(call -> {
+                var source = call.getArgument(1, DamageSource.class);
+                var event = new EntityDamageByEntityEvent(arrow, target, EntityDamageEvent.DamageCause.PROJECTILE,
+                    source, (Double) call.getArgument(0)); damages.add(event); f.dispatcher.accept(event); return null;
+            }).when(target).damage(anyDouble(), any(DamageSource.class));
+            a.core.inventory.setItem(20, new ItemStack(Material.ARROW, 32));
+            drawAndRelease(f, a, 20); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var velocity = ArgumentCaptor.forClass(Vector.class);
+            verify(a.player).launchProjectile(eq(Arrow.class), velocity.capture());
+            assertEquals(3.0, velocity.getValue().length(), 1.0e-9);
+            verify(arrow).setPickupStatus(AbstractArrow.PickupStatus.DISALLOWED);
+            verify(arrow).setDamage(0);
+            assertEquals(32, a.core.inventory.getItem(20).getAmount(), "Ordinary ammunition must remain untouched");
+            f.dispatcher.accept(new ProjectileHitEvent(arrow, target));
+            assertEquals(1, damages.size()); assertEquals(7.0, damages.getFirst().getFinalDamage(), 1.0e-9);
+            f.dispatcher.accept(new EntityDeathEvent(target, damages.getFirst().getDamageSource(), new ArrayList<>(), 0));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var saved = storage.find(a.core.record.id()).get().orElseThrow();
+            assertEquals(BigInteger.TEN, saved.experience()); assertNotNull(saved.cooldowns().get("longbow"));
+            f.dispatcher.accept(new ProjectileHitEvent(arrow, target)); assertEquals(1, damages.size());
+        }
+    }
+
+    @Test void partialDrawUsesReviewedCurveWhileTooShortDrawRefusesBeforeCooldown() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); withLongbow(data, a, 14);
+            f.players.put(a.core.id, a.player); f.activate(a); when(a.world.getUID()).thenReturn(java.util.UUID.randomUUID());
+            var arrow = arrow(a, new Location(a.world, 6, 65.6, 0));
+            doAnswer(call -> { f.dispatcher.accept(new ProjectileLaunchEvent(arrow)); return arrow; })
+                .when(a.player).launchProjectile(eq(Arrow.class), any(Vector.class));
+            drawAndRelease(f, a, 2);
+            verify(a.player, never()).launchProjectile(eq(Arrow.class), any(Vector.class));
+            var storage = (CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            assertFalse(storage.find(a.core.record.id()).get().orElseThrow().cooldowns().containsKey("longbow"));
+            assertTrue(a.messages.stream().anyMatch(message -> message.contains("not eligible")));
+
+            var target = mock(LivingEntity.class); when(target.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+            when(target.getLocation()).thenReturn(new Location(a.world, 6, 65.6, 0));
+            var amount = new double[1];
+            doAnswer(call -> {
+                amount[0] = call.getArgument(0); var source = call.getArgument(1, DamageSource.class);
+                f.dispatcher.accept(new EntityDamageByEntityEvent(arrow, target, EntityDamageEvent.DamageCause.PROJECTILE,
+                    source, amount[0])); return null;
+            }).when(target).damage(anyDouble(), any(DamageSource.class));
+            drawAndRelease(f, a, 10); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            f.dispatcher.accept(new ProjectileHitEvent(arrow, target));
+            assertEquals(7.0 * (0.25 + 1.0) / 3.0, amount[0], 1.0e-9);
+        }
+    }
+
+    @Test void nativeDamagePartyTargetsAndCancelledCustomDamageProduceNoAcceptedHit() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); var b = new FantasyStickLifecycleNativeTest.Actor(data);
+            withLongbow(data, a, 14); f.players.put(a.core.id, a.player); f.players.put(b.core.id, b.player);
+            f.activate(a); f.activate(b); when(a.world.getUID()).thenReturn(java.util.UUID.randomUUID());
+            var party = PartyLifecycleNativeTest.parties(f).create(a.core.id).orElseThrow();
+            assertTrue(PartyLifecycleNativeTest.parties(f).accept(b.core.id,
+                PartyLifecycleNativeTest.parties(f).invite(a.core.id, party.id(), b.core.id).orElseThrow().id()));
+            var arrow = arrow(a, new Location(a.world, 4, 65.6, 0));
+            doAnswer(call -> { f.dispatcher.accept(new ProjectileLaunchEvent(arrow)); return arrow; })
+                .when(a.player).launchProjectile(eq(Arrow.class), any(Vector.class));
+            drawAndRelease(f, a, 20); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var ordinaryTarget = mock(LivingEntity.class); when(ordinaryTarget.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+            var nativeDamage = new EntityDamageByEntityEvent(arrow, ordinaryTarget,
+                EntityDamageEvent.DamageCause.PROJECTILE, 7.0);
+            f.dispatcher.accept(nativeDamage); assertTrue(nativeDamage.isCancelled(), "Owned arrows cannot add vanilla damage");
+            f.dispatcher.accept(new ProjectileHitEvent(arrow, b.player));
+            verify(b.player, never()).damage(anyDouble(), any(DamageSource.class));
+
+            var c = new FantasyStickLifecycleNativeTest.Actor(data); withLongbow(data, c, 14);
+            f.players.put(c.core.id, c.player); f.activate(c); when(c.world.getUID()).thenReturn(java.util.UUID.randomUUID());
+            var arrow2 = arrow(c, new Location(c.world, 4, 65.6, 0));
+            doAnswer(call -> { f.dispatcher.accept(new ProjectileLaunchEvent(arrow2)); return arrow2; })
+                .when(c.player).launchProjectile(eq(Arrow.class), any(Vector.class));
+            var hostile = mock(LivingEntity.class); when(hostile.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+            when(hostile.getLocation()).thenReturn(new Location(c.world, 4, 65.6, 0));
+            doAnswer(call -> {
+                var source = call.getArgument(1, DamageSource.class);
+                var event = new EntityDamageByEntityEvent(arrow2, hostile, EntityDamageEvent.DamageCause.PROJECTILE,
+                    source, (Double) call.getArgument(0)); event.setCancelled(true); f.dispatcher.accept(event); return null;
+            }).when(hostile).damage(anyDouble(), any(DamageSource.class));
+            drawAndRelease(f, c, 20); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            f.dispatcher.accept(new ProjectileHitEvent(arrow2, hostile));
+            var storage = (CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            assertEquals(BigInteger.ZERO, storage.find(c.core.record.id()).get().orElseThrow().experience());
+            assertNotNull(storage.find(c.core.record.id()).get().orElseThrow().cooldowns().get("longbow"));
+        }
+    }
+
+    @Test void rangeLifetimeAndSessionEndRemoveOwnedArrowsWithoutLateDamage() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var target = mock(LivingEntity.class); when(target.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+            for (int route = 0; route < 3; route++) {
+                var a = new FantasyStickLifecycleNativeTest.Actor(data); withLongbow(data, a, 14);
+                f.players.put(a.core.id, a.player); f.activate(a); when(a.world.getUID()).thenReturn(java.util.UUID.randomUUID());
+                var location = new Location(a.world, route == 0 ? 64.01 : 2, 65.6, 0);
+                var arrow = arrow(a, location);
+                doAnswer(call -> { f.dispatcher.accept(new ProjectileLaunchEvent(arrow)); return arrow; })
+                    .when(a.player).launchProjectile(eq(Arrow.class), any(Vector.class));
+                drawAndRelease(f, a, 20); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+                if (route == 0) {
+                    f.dispatcher.accept(new ProjectileHitEvent(arrow, target));
+                    verify(target, never()).damage(anyDouble(), any(DamageSource.class));
+                } else if (route == 1) {
+                    f.delayed.getLast().run();
+                    f.dispatcher.accept(new ProjectileHitEvent(arrow, target));
+                    verify(target, never()).damage(anyDouble(), any(DamageSource.class));
+                } else {
+                    a.core.inventory.setItemInOffHand(null); f.changed(a); PartyBookNativeTest.drain(f); f.awaitCharacterAndReceipt(a);
+                    ((games.dmg.fantasystick.ability.AbilityEngine) FantasyStickLifecycleNativeTest.Fixture.field(
+                        f.plugin, "abilityEngine")).sweep();
+                }
+                verify(arrow, atLeastOnce()).remove();
+            }
+        }
+    }
+
+    @Test void unlearnRelearnAndTransferRetainRecoveryAndRemoveTheOwnedArrow() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); withLongbow(data, a, 14);
+            f.players.put(a.core.id, a.player); f.activate(a); when(a.world.getUID()).thenReturn(java.util.UUID.randomUUID());
+            var arrow = arrow(a, new Location(a.world, 2, 65.6, 0));
+            doAnswer(call -> { f.dispatcher.accept(new ProjectileLaunchEvent(arrow)); return arrow; })
+                .when(a.player).launchProjectile(eq(Arrow.class), any(Vector.class));
+            drawAndRelease(f, a, 20); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var storage = (CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            var deadline = storage.find(a.core.record.id()).get().orElseThrow().cooldowns().get("longbow");
+            assertNotNull(deadline);
+            a.core.inventory.getInventory().setSelectedSlot(0); PartyBookNativeTest.open(f, a);
+            var unlearn = abilityButton(a, "[Unlearn]", "longbow");
+            PartyBookNativeTest.click(f, a, unlearn); PartyBookNativeTest.click(f, a, unlearn);
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var refunded = storage.find(a.core.record.id()).get().orElseThrow();
+            assertEquals(BigInteger.valueOf(40), refunded.unspentPoints());
+            assertFalse(refunded.learned().contains("longbow")); assertEquals(deadline, refunded.cooldowns().get("longbow"));
+            verify(arrow, atLeastOnce()).remove();
+            learnAndAssign(f, a); drawAndRelease(f, a, 20);
+            verify(a.player, times(1)).launchProjectile(eq(Arrow.class), any(Vector.class));
+            assertTrue(a.messages.stream().anyMatch(message -> message.contains("ready in")));
+            var sheet = a.core.inventory.getItemInOffHand().clone();
+            a.core.inventory.setItemInOffHand(null); f.changed(a); PartyBookNativeTest.drain(f); f.awaitCharacterAndReceipt(a);
+            var b = new FantasyStickLifecycleNativeTest.Actor(data); b.core.inventory.setItemInOffHand(sheet);
+            f.players.put(b.core.id, b.player); f.activate(b); drawAndRelease(f, b, 20);
+            verify(b.player, never()).launchProjectile(eq(Arrow.class), any(Vector.class));
+            assertTrue(b.messages.stream().anyMatch(message -> message.contains("ready in")));
+        }
+    }
+
+    @Test void failedRecoveryPersistenceLaunchesNoArrow() {
+        var storage = mock(CharacterStorage.class);
+        var sessions = mock(games.dmg.fantasystick.session.EquipmentSessions.class);
+        var parties = new games.dmg.fantasystick.party.PartyRoster(java.time.Clock.systemUTC(), ignored -> true);
+        var registry = new games.dmg.fantasystick.ability.AbilityRegistry();
+        var longbow = new games.dmg.fantasystick.ability.Longbow(
+            games.dmg.fantasystick.ability.Longbow.Settings.defaults()); registry.register(longbow.definition());
+        var base = new games.dmg.fantasystick.crafting.CharacterFactory().create(
+            games.dmg.fantasystick.progression.ProgressionRules.defaults());
+        var stats = new EnumMap<>(base.stats()); stats.put(Stat.DEX, BigInteger.valueOf(14));
+        var record = new CharacterRecord(base.id(), base.name(), base.revision(), stats, base.level(), base.experience(),
+            base.unspentPoints(), base.health(), java.util.Set.of("longbow"),
+            List.of("longbow", "", "", "", "", "", ""), base.cooldowns(), base.restrictedKills(), false, null, null);
+        var active = new games.dmg.fantasystick.session.EquipmentSessions.Active(java.util.UUID.randomUUID(),
+            java.util.UUID.randomUUID(), record.id());
+        var player = mock(org.bukkit.entity.Player.class);
+        when(sessions.current(active)).thenReturn(true); when(sessions.currentRecord(active)).thenReturn(java.util.Optional.of(record));
+        var failed = new java.util.concurrent.CompletableFuture<CharacterStorage.AbilityMutation>();
+        failed.completeExceptionally(new java.io.IOException("simulated Longbow recovery failure"));
+        when(storage.commitAbilityCooldown(eq(record.id()), eq(record.revision()), eq("longbow"), any())).thenReturn(failed);
+        var failures = new ArrayList<games.dmg.fantasystick.ability.AbilityEngine.Failure>();
+        var engine = new games.dmg.fantasystick.ability.AbilityEngine(registry, storage, sessions, parties,
+            java.time.Clock.systemUTC(), Runnable::run, (delay, action) -> () -> {}, ignored -> {}, failures::add);
+        engine.accept(new games.dmg.fantasystick.session.ControlInput(player, active, 2, "longbow",
+            games.dmg.fantasystick.session.ControlInput.Kind.ABILITY,
+            games.dmg.fantasystick.session.ControlInput.Gesture.DRAW_RELEASE, null, 20, 0, () -> true));
+        verify(player, never()).launchProjectile(eq(Arrow.class), any(Vector.class));
+        assertEquals(1, failures.size()); engine.close(); longbow.close(); parties.close();
+    }
+
+    @Test void acknowledgedConfigurationChangesOnlyFutureShotSnapshots() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); withLongbow(data, a, 14);
+            f.players.put(a.core.id, a.player); f.activate(a); when(a.world.getUID()).thenReturn(java.util.UUID.randomUUID());
+            var oldArrow = arrow(a, new Location(a.world, 3, 65.6, 0));
+            doAnswer(call -> { f.dispatcher.accept(new ProjectileLaunchEvent(oldArrow)); return oldArrow; })
+                .when(a.player).launchProjectile(eq(Arrow.class), any(Vector.class));
+            drawAndRelease(f, a, 20); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var sender = new EquipmentAdminCommandNativeTest.Sender();
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "longbow-base-damage", "9"});
+            var response = f.tasks.poll(5, java.util.concurrent.TimeUnit.SECONDS); assertNotNull(response); response.run();
+
+            var oldTarget = targetRecordingDamage(f, a, oldArrow); f.dispatcher.accept(new ProjectileHitEvent(oldArrow, oldTarget.entity()));
+            assertEquals(7.0, oldTarget.amount()[0], 1.0e-9);
+            var b = new FantasyStickLifecycleNativeTest.Actor(data); withLongbow(data, b, 14);
+            f.players.put(b.core.id, b.player); f.activate(b); when(b.world.getUID()).thenReturn(java.util.UUID.randomUUID());
+            var newArrow = arrow(b, new Location(b.world, 3, 65.6, 0));
+            doAnswer(call -> { f.dispatcher.accept(new ProjectileLaunchEvent(newArrow)); return newArrow; })
+                .when(b.player).launchProjectile(eq(Arrow.class), any(Vector.class));
+            var newTarget = targetRecordingDamage(f, b, newArrow);
+            drawAndRelease(f, b, 20); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            f.dispatcher.accept(new ProjectileHitEvent(newArrow, newTarget.entity()));
+            assertEquals(11.0, newTarget.amount()[0], 1.0e-9);
+        }
+    }
+
+    @Test void failedAdminWriteKeepsLongbowDefinitionAndExternalFileUnchanged() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var outside = data.resolveSibling(data.getFileName() + "-longbow-outside");
+            java.nio.file.Files.writeString(outside, "untouched\n");
+            java.nio.file.Files.createSymbolicLink(data.resolve("config.yml"), outside);
+            var sender = new EquipmentAdminCommandNativeTest.Sender();
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "longbow-base-damage", "9"});
+            var response = f.tasks.poll(5, java.util.concurrent.TimeUnit.SECONDS); assertNotNull(response); response.run();
+            assertTrue(sender.messages.getLast().contains("save failed"));
+            var registry = (games.dmg.fantasystick.ability.AbilityRegistry)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "abilityRegistry");
+            assertEquals(new java.math.BigDecimal("5"), registry.find("longbow").orElseThrow()
+                .parameters().get("base-damage"));
+            assertEquals("untouched\n", java.nio.file.Files.readString(outside));
+            java.nio.file.Files.delete(data.resolve("config.yml")); java.nio.file.Files.delete(outside);
+        }
+    }
+
+    @Test void reenableDrainsAcceptedLongbowConfigurationBeforeGameplayRegistration() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var settings = FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "longbowSettings");
+            var worker = (java.util.concurrent.ExecutorService) FantasyStickLifecycleNativeTest.Fixture.field(settings, "worker");
+            var entered = new java.util.concurrent.CountDownLatch(1); var release = new java.util.concurrent.CountDownLatch(1);
+            worker.execute(() -> {
+                entered.countDown();
+                try { release.await(5, java.util.concurrent.TimeUnit.SECONDS); }
+                catch (InterruptedException failure) { Thread.currentThread().interrupt(); }
+            });
+            try {
+                assertTrue(entered.await(5, java.util.concurrent.TimeUnit.SECONDS));
+                var sender = new EquipmentAdminCommandNativeTest.Sender();
+                f.command.execute(sender.port, "fantasystick", new String[]{"config", "longbow-base-damage", "9"});
+                f.plugin.setEnabled(false); f.plugin.setEnabled(true);
+                assertNull(FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "sessions"));
+                release.countDown(); f.tick();
+                var registry = (games.dmg.fantasystick.ability.AbilityRegistry)
+                    FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "abilityRegistry");
+                assertEquals(new java.math.BigDecimal("9"), registry.find("longbow").orElseThrow()
+                    .parameters().get("base-damage"));
+            } finally { release.countDown(); }
+        }
+    }
+
+    @Test void configuredDefinitionFormulaValidationAndAdminRoutesCoverEverySetting() throws Exception {
+        java.nio.file.Files.writeString(data.resolve("config.yml"),
+            "longbow-base-damage: 8\nlongbow-recovery-seconds: 2\nlongbow-minimum-draw-ticks: 4\n"
+                + "longbow-full-draw-ticks: 30\nlongbow-range-blocks: 70\nlongbow-lifetime-seconds: 11\n"
+                + "longbow-full-projectile-speed-blocks-per-tick: 4\n");
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var registry = (games.dmg.fantasystick.ability.AbilityRegistry)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "abilityRegistry");
+            var definition = registry.find("longbow").orElseThrow();
+            assertEquals(java.time.Duration.ofSeconds(2), definition.cooldown());
+            assertEquals(new java.math.BigDecimal("8"), definition.parameters().get("base-damage"));
+            assertEquals(new java.math.BigDecimal("4"), definition.parameters().get("minimum-draw-ticks"));
+            assertEquals(new java.math.BigDecimal("30"), definition.parameters().get("full-draw-ticks"));
+            assertEquals(0, new java.math.BigDecimal("70").compareTo(definition.parameters().get("range")));
+            assertEquals(0, new java.math.BigDecimal("11").compareTo(definition.parameters().get("lifetime")));
+            assertEquals(0, new java.math.BigDecimal("4").compareTo(definition.parameters().get("full-projectile-speed")));
+            assertEquals(java.math.BigDecimal.ONE, games.dmg.fantasystick.ability.Longbow.power(30, 30));
+            assertEquals(0, games.dmg.fantasystick.ability.Longbow.power(15, 30)
+                .compareTo(new java.math.BigDecimal("0.4166666666666666666666666666666667")));
+            assertEquals(BigInteger.valueOf(7), games.dmg.fantasystick.ability.Longbow.fullDamage(BigInteger.valueOf(14)));
+            assertEquals(BigInteger.TEN.pow(500).subtract(BigInteger.TEN).divide(BigInteger.TWO).add(BigInteger.valueOf(5)),
+                games.dmg.fantasystick.ability.Longbow.fullDamage(BigInteger.TEN.pow(500)));
+            var unavailable = new FantasyStickLifecycleNativeTest.Actor(data);
+            f.players.put(unavailable.core.id, unavailable.player); f.activate(unavailable);
+            unavailable.core.inventory.getInventory().setSelectedSlot(0); PartyBookNativeTest.open(f, unavailable);
+            assertTrue(PartyBookNativeTest.text(unavailable).replaceAll("\\s+", "").contains("Unavailable:requirements"));
+            assertThrows(AssertionError.class, () -> abilityButton(unavailable, "[Learn]", "longbow"));
+
+            var sender = new EquipmentAdminCommandNativeTest.Sender();
+            assertEquals(java.util.List.of("config", "inspect", "recover"),
+                f.command.tabComplete(sender.port, "fantasystick", new String[]{""}));
+            assertEquals(java.util.List.of("config"), f.command.tabComplete(sender.port, "fantasystick", new String[]{"c"}));
+            assertTrue(f.command.tabComplete(sender.port, "fantasystick", new String[]{"unknown"}).isEmpty());
+            assertEquals(java.util.List.of("longbow-base-damage"),
+                f.command.tabComplete(sender.port, "fantasystick", new String[]{"config", "longbow-b"}));
+            assertEquals(7, f.command.tabComplete(sender.port, "fantasystick", new String[]{"config", "longbow-"}).size());
+            assertEquals(java.util.List.of("5", "8"), f.command.tabComplete(sender.port, "fantasystick",
+                new String[]{"config", "longbow-base-damage", ""}));
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "longbow-base-damage"});
+            assertTrue(sender.messages.getLast().contains("longbow-base-damage=8"));
+            sender.allowed = false;
+            assertTrue(f.command.tabComplete(sender.port, "fantasystick", new String[]{"config", "longbow"}).isEmpty());
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "longbow-base-damage", "9"});
+            assertTrue(sender.messages.getLast().contains("Permission denied"), sender.messages.toString()); sender.allowed = true;
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "longbow-base-damage", "9"});
+            var response = f.tasks.poll(5, java.util.concurrent.TimeUnit.SECONDS); assertNotNull(response); response.run();
+            assertEquals(new java.math.BigDecimal("9"), registry.find("longbow").orElseThrow()
+                .parameters().get("base-damage"));
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "longbow-base-damage", "-1"});
+            assertTrue(sender.messages.getLast().contains("invalid"));
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "longbow-base-damage", "9", "extra"});
+            assertTrue(sender.messages.getLast().contains("Usage"));
+            f.plugin.setEnabled(false); f.plugin.setEnabled(true);
+            var reloaded = (games.dmg.fantasystick.ability.AbilityRegistry)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "abilityRegistry");
+            assertEquals(new java.math.BigDecimal("9"), reloaded.find("longbow").orElseThrow()
+                .parameters().get("base-damage"));
+        }
+
+        for (String invalid : List.of("longbow-base-damage: -1\n", "longbow-recovery-seconds: 0.5\n",
+                "longbow-minimum-draw-ticks: 0\n", "longbow-full-draw-ticks: 2\n",
+                "longbow-range-blocks: 0\n", "longbow-lifetime-seconds: 0\n",
+                "longbow-full-projectile-speed-blocks-per-tick: 0\n")) {
+            var directory = data.resolve(Integer.toHexString(invalid.hashCode()));
+            java.nio.file.Files.createDirectories(directory); java.nio.file.Files.writeString(directory.resolve("config.yml"), invalid);
+            try (var f = new FantasyStickLifecycleNativeTest.Fixture(directory)) {
+                assertThrows(IllegalArgumentException.class, () -> f.plugin.setEnabled(true));
+                assertTrue(f.order.isEmpty()); assertTrue(f.recipes.isEmpty());
+            }
+        }
+    }
+
+    private record DamageTarget(LivingEntity entity, double[] amount) { }
+
+    private static DamageTarget targetRecordingDamage(FantasyStickLifecycleNativeTest.Fixture fixture,
+                                                       FantasyStickLifecycleNativeTest.Actor actor, Arrow arrow) {
+        var target = mock(LivingEntity.class); when(target.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+        when(target.getLocation()).thenReturn(new Location(actor.world, 3, 65.6, 0));
+        var amount = new double[1];
+        doAnswer(call -> {
+            amount[0] = call.getArgument(0); var source = call.getArgument(1, DamageSource.class);
+            fixture.dispatcher.accept(new EntityDamageByEntityEvent(arrow, target,
+                EntityDamageEvent.DamageCause.PROJECTILE, source, amount[0])); return null;
+        }).when(target).damage(anyDouble(), any(DamageSource.class));
+        return new DamageTarget(target, amount);
+    }
+
+    private static void learnAndAssign(FantasyStickLifecycleNativeTest.Fixture fixture,
+                                       FantasyStickLifecycleNativeTest.Actor actor) throws Exception {
+        actor.core.inventory.getInventory().setSelectedSlot(0); PartyBookNativeTest.open(fixture, actor);
+        PartyBookNativeTest.click(fixture, actor, abilityButton(actor, "[Learn]", "longbow"));
+        PartyBookNativeTest.drain(fixture); PartyBookNativeTest.drain(fixture);
+        PartyBookNativeTest.click(fixture, actor, abilityButton(actor, "[3]", "longbow"));
+        PartyBookNativeTest.drain(fixture); PartyBookNativeTest.drain(fixture);
+    }
+
+    private static void drawAndRelease(FantasyStickLifecycleNativeTest.Fixture fixture,
+                                       FantasyStickLifecycleNativeTest.Actor actor, int ticks) {
+        actor.core.inventory.getInventory().setSelectedSlot(2);
+        var eye = new Location(actor.world, 0, 65.6, 0); eye.setDirection(new Vector(1, 0, 0));
+        doReturn(eye).when(actor.player).getEyeLocation();
+        var bow = actor.core.inventory.getItem(2).clone();
+        fixture.dispatcher.accept(new PlayerInteractEvent(actor.player, org.bukkit.event.block.Action.RIGHT_CLICK_AIR,
+            bow, null, org.bukkit.block.BlockFace.SELF, EquipmentSlot.HAND));
+        fixture.dispatcher.accept(new io.papermc.paper.event.player.PlayerStopUsingItemEvent(actor.player, bow, ticks));
+    }
+
+    private static Arrow arrow(FantasyStickLifecycleNativeTest.Actor actor, Location location) {
+        var arrow = PartyCombatNativeTest.entity(Arrow.class);
+        when(arrow.getShooter()).thenReturn(actor.player); when(arrow.getLocation()).thenReturn(location);
+        when(arrow.getWorld()).thenReturn(actor.world); return arrow;
+    }
+
+    private static ClickEvent.Custom abilityButton(FantasyStickLifecycleNativeTest.Actor actor, String label, String ability) {
+        var book = org.bukkit.craftbukkit.inventory.CraftItemStack.asNMSCopy(actor.books.getLast())
+            .get(net.minecraft.core.component.DataComponents.WRITTEN_BOOK_CONTENT);
+        assertNotNull(book);
+        for (var page : book.pages()) {
+            var found = abilityButton(page.raw(), label, ability);
+            if (found != null) return found;
+        }
+        throw new AssertionError("Missing " + label + " action for " + ability);
+    }
+
+    private static ClickEvent.Custom abilityButton(net.minecraft.network.chat.Component component,
+                                                    String label, String ability) {
+        if (component.getString().equals(label)
+                && component.getStyle().getClickEvent() instanceof ClickEvent.Custom custom
+                && custom.payload().orElse(null) instanceof net.minecraft.nbt.StringTag payload
+                && payload.value().contains(":" + ability)) return custom;
+        for (var child : component.getSiblings()) {
+            var found = abilityButton(child, label, ability);
+            if (found != null) return found;
+        }
+        return null;
+    }
+
+    private static void withStats(Path data, FantasyStickLifecycleNativeTest.Actor actor,
+                                  int intelligence, int dexterity) 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.INT, BigInteger.valueOf(intelligence));
+        stats.put(Stat.DEX, BigInteger.valueOf(dexterity));
+        repository.replace(new CharacterRecord(old.id(), old.name(), old.revision().add(BigInteger.ONE), stats,
+            old.level(), old.experience(), BigInteger.valueOf(40), old.health(), old.learned(), old.loadout(),
+            old.cooldowns(), old.restrictedKills(), false, null, null), old.revision());
+    }
+
+    private static void withLongbow(Path data, FantasyStickLifecycleNativeTest.Actor actor, int dexterity) throws Exception {
+        withStats(data, actor, 0, dexterity);
+        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(),
+            old.level(), old.experience(), old.unspentPoints().subtract(BigInteger.ONE), old.health(),
+            java.util.Set.of("longbow"), List.of("longbow", "", "", "", "", "", ""), old.cooldowns(),
+            old.restrictedKills(), false, null, null), old.revision());
+    }
+}

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

@@ -0,0 +1,308 @@
+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.persistence.CharacterRecord;
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import games.dmg.fantasystick.progression.Stat;
+import java.math.BigInteger;
+import java.nio.file.Path;
+import java.util.EnumMap;
+import java.util.List;
+import java.util.concurrent.atomic.AtomicReference;
+import net.minecraft.network.chat.ClickEvent;
+import org.bukkit.Location;
+import org.bukkit.event.player.PlayerInteractEvent;
+import org.bukkit.event.player.PlayerMoveEvent;
+import org.bukkit.inventory.EquipmentSlot;
+import org.bukkit.util.Vector;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class QuickstepNativeTest {
+    @TempDir Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test void bookAcquisitionEquippedUseAppliesAndStopsOwnedHorizontalVelocityAtFourBlocks() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); withStats(data, a, 12, false);
+            f.players.put(a.core.id, a.player); f.activate(a);
+            a.core.inventory.getInventory().setSelectedSlot(0); PartyBookNativeTest.open(f, a);
+            String text = PartyBookNativeTest.text(a).replaceAll("\\s+", "");
+            assertTrue(text.contains("Quickstep")); assertTrue(text.contains("DEX12"));
+            assertTrue(text.contains("Cost:1")); assertTrue(text.contains("4")); assertTrue(text.contains("5s"));
+            PartyBookNativeTest.click(f, a, abilityButton(a, "[Learn]", "quickstep"));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            PartyBookNativeTest.click(f, a, abilityButton(a, "[3]", "quickstep"));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var storage = (CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            assertEquals(BigInteger.valueOf(39), storage.find(a.core.record.id()).get().orElseThrow().unspentPoints());
+
+            var velocity = prepareMovement(a, new Vector(0, 0.25, 0));
+            use(f, a); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            assertEquals(new Vector(1, 0.25, 0), velocity.get());
+            verify(a.player, never()).setFallDistance(anyFloat());
+            assertNotNull(storage.find(a.core.record.id()).get().orElseThrow().cooldowns().get("quickstep"));
+            var from = new Location(a.world, 0, 64, 0); var to = new Location(a.world, 4, 64, 0);
+            f.dispatcher.accept(new PlayerMoveEvent(a.player, from, to));
+            assertEquals(new Vector(0, 0.25, 0), velocity.get(), "Only remaining owned horizontal motion is removed");
+        }
+    }
+
+    @Test void airborneFlyingGlidingOrMountedUseRefusesBeforeCooldownAndMovement() throws Exception {
+        for (int route = 0; route < 4; route++) try (var f = new FantasyStickLifecycleNativeTest.Fixture(data.resolve(Integer.toString(route)))) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data.resolve(Integer.toString(route)));
+            withStats(data.resolve(Integer.toString(route)), a, 12, true);
+            f.players.put(a.core.id, a.player); f.activate(a);
+            var velocity = prepareMovement(a, new Vector(0.3, 0.4, 0.5));
+            doReturn(route != 0).when(a.player).isOnGround();
+            doReturn(route == 1).when(a.player).isFlying();
+            doReturn(route == 2).when(a.player).isGliding();
+            doReturn(route == 3).when(a.player).isInsideVehicle();
+            use(f, a);
+            assertEquals(new Vector(0.3, 0.4, 0.5), velocity.get());
+            var storage = (CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            assertFalse(storage.find(a.core.record.id()).get().orElseThrow().cooldowns().containsKey("quickstep"));
+            assertTrue(a.messages.stream().anyMatch(message -> message.contains("not eligible")));
+        }
+    }
+
+    @Test void velocityCancellationObstacleAndUnrelatedReplacementAreAuthoritative() throws Exception {
+        for (int route = 0; route < 3; route++) try (var f = new FantasyStickLifecycleNativeTest.Fixture(data.resolve("motion-" + route))) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data.resolve("motion-" + route));
+            withStats(data.resolve("motion-" + route), a, 12, true);
+            f.players.put(a.core.id, a.player); f.activate(a);
+            var velocity = prepareMovement(a, new Vector(0, 0.3, 0));
+            if (route == 0) {
+                class Veto implements org.bukkit.event.Listener {
+                    @org.bukkit.event.EventHandler public void velocity(org.bukkit.event.player.PlayerVelocityEvent event) {
+                        if (event.getPlayer() == a.player) event.setCancelled(true);
+                    }
+                }
+                f.dispatcher.register(new Veto(), f.plugin);
+            }
+            use(f, a); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var storage = (CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            assertNotNull(storage.find(a.core.record.id()).get().orElseThrow().cooldowns().get("quickstep"));
+            if (route == 0) {
+                assertEquals(new Vector(0, 0.3, 0), velocity.get(), "Cancelled velocity applies no movement");
+            } else if (route == 1) {
+                velocity.set(new Vector(0, 0.3, 0));
+                f.dispatcher.accept(new PlayerMoveEvent(a.player, new Location(a.world, 0, 64, 0),
+                    new Location(a.world, 0.2, 64, 0)));
+                assertEquals(new Vector(0, 0.3, 0), velocity.get(), "Native collision stops movement early");
+            } else {
+                velocity.set(new Vector(0, 0.6, 2));
+                f.dispatcher.accept(new PlayerMoveEvent(a.player, new Location(a.world, 0, 64, 0),
+                    new Location(a.world, 0.2, 64, 0)));
+                assertEquals(new Vector(0, 0.6, 2), velocity.get(), "Replacement movement relinquishes ownership");
+            }
+            verify(a.player, never()).setFallDistance(anyFloat());
+        }
+    }
+
+    @Test void unlearnRelearnAndTransferRetainCooldownAndClearOnlyOwnedHorizontalMotion() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); withStats(data, a, 12, true);
+            f.players.put(a.core.id, a.player); f.activate(a); var velocity = prepareMovement(a, new Vector(0, 0.4, 0));
+            use(f, a); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var storage = (CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            var deadline = storage.find(a.core.record.id()).get().orElseThrow().cooldowns().get("quickstep"); assertNotNull(deadline);
+            a.core.inventory.getInventory().setSelectedSlot(0); PartyBookNativeTest.open(f, a);
+            var unlearn = abilityButton(a, "[Unlearn]", "quickstep");
+            PartyBookNativeTest.click(f, a, unlearn); PartyBookNativeTest.click(f, a, unlearn);
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var refunded = storage.find(a.core.record.id()).get().orElseThrow();
+            assertEquals(BigInteger.valueOf(40), refunded.unspentPoints()); assertEquals(deadline, refunded.cooldowns().get("quickstep"));
+            assertEquals(new Vector(0, 0.4, 0), velocity.get());
+            learnAndAssign(f, a); use(f, a);
+            assertTrue(a.messages.stream().anyMatch(message -> message.contains("ready in")));
+            assertEquals(new Vector(0, 0.4, 0), velocity.get());
+            var sheet = a.core.inventory.getItemInOffHand().clone();
+            a.core.inventory.setItemInOffHand(null); f.changed(a); PartyBookNativeTest.drain(f); f.awaitCharacterAndReceipt(a);
+            var b = new FantasyStickLifecycleNativeTest.Actor(data); b.core.inventory.setItemInOffHand(sheet);
+            f.players.put(b.core.id, b.player); f.activate(b); prepareMovement(b, new Vector(0.2, 0.3, 0.4)); use(f, b);
+            assertTrue(b.messages.stream().anyMatch(message -> message.contains("ready in")));
+        }
+    }
+
+    @Test void failedCooldownPersistenceAppliesNoVelocity() {
+        var storage = mock(CharacterStorage.class);
+        var sessions = mock(games.dmg.fantasystick.session.EquipmentSessions.class);
+        var parties = new games.dmg.fantasystick.party.PartyRoster(java.time.Clock.systemUTC(), ignored -> true);
+        var registry = new games.dmg.fantasystick.ability.AbilityRegistry();
+        var quickstep = new games.dmg.fantasystick.ability.Quickstep(
+            games.dmg.fantasystick.ability.Quickstep.Settings.defaults(), ignored -> {});
+        registry.register(quickstep.definition());
+        var base = new games.dmg.fantasystick.crafting.CharacterFactory().create(
+            games.dmg.fantasystick.progression.ProgressionRules.defaults());
+        var stats = new EnumMap<>(base.stats()); stats.put(Stat.DEX, BigInteger.valueOf(12));
+        var record = new CharacterRecord(base.id(), base.name(), base.revision(), stats, base.level(), base.experience(),
+            base.unspentPoints(), base.health(), java.util.Set.of("quickstep"),
+            List.of("quickstep", "", "", "", "", "", ""), base.cooldowns(), base.restrictedKills(), false, null, null);
+        var active = new games.dmg.fantasystick.session.EquipmentSessions.Active(java.util.UUID.randomUUID(),
+            java.util.UUID.randomUUID(), record.id());
+        var player = mock(org.bukkit.entity.Player.class);
+        when(sessions.current(active)).thenReturn(true); when(sessions.currentRecord(active)).thenReturn(java.util.Optional.of(record));
+        doReturn(true).when(player).isOnGround(); doReturn(false).when(player).isFlying();
+        doReturn(false).when(player).isGliding(); doReturn(false).when(player).isInsideVehicle();
+        var eye = new Location(mock(org.bukkit.World.class), 0, 0, 0); eye.setDirection(new Vector(1, 0, 0));
+        doReturn(eye).when(player).getEyeLocation();
+        var failed = new java.util.concurrent.CompletableFuture<CharacterStorage.AbilityMutation>();
+        failed.completeExceptionally(new java.io.IOException("simulated Quickstep cooldown failure"));
+        when(storage.commitAbilityCooldown(eq(record.id()), eq(record.revision()), eq("quickstep"), any())).thenReturn(failed);
+        var failures = new java.util.ArrayList<games.dmg.fantasystick.ability.AbilityEngine.Failure>();
+        var engine = new games.dmg.fantasystick.ability.AbilityEngine(registry, storage, sessions, parties,
+            java.time.Clock.systemUTC(), Runnable::run, (delay, action) -> () -> {}, ignored -> {}, failures::add);
+        engine.accept(new games.dmg.fantasystick.session.ControlInput(player, active, 2, "quickstep",
+            games.dmg.fantasystick.session.ControlInput.Kind.ABILITY,
+            games.dmg.fantasystick.session.ControlInput.Gesture.USE, null, 0, 0, () -> true));
+        verify(player, never()).setVelocity(any(Vector.class)); assertEquals(1, failures.size());
+        engine.close(); quickstep.close(); parties.close();
+    }
+
+    @Test void acknowledgedUpdatesAffectFutureDashesWhileActiveDashKeepsCapturedBounds() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); withStats(data, a, 12, true);
+            f.players.put(a.core.id, a.player); f.activate(a); var oldVelocity = prepareMovement(a, new Vector(0, 0.2, 0));
+            use(f, a); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var sender = new EquipmentAdminCommandNativeTest.Sender();
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "quickstep-distance-blocks", "7"});
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "quickstep-speed-blocks-per-tick", "2"});
+            for (int i = 0; i < 2; i++) {
+                var response = f.tasks.poll(5, java.util.concurrent.TimeUnit.SECONDS); assertNotNull(response); response.run();
+            }
+            f.dispatcher.accept(new PlayerMoveEvent(a.player, new Location(a.world, 0, 64, 0),
+                new Location(a.world, 4, 64, 0)));
+            assertEquals(new Vector(0, 0.2, 0), oldVelocity.get(), "Active dash retains its four-block snapshot");
+            var b = new FantasyStickLifecycleNativeTest.Actor(data); withStats(data, b, 12, true);
+            f.players.put(b.core.id, b.player); f.activate(b); var newVelocity = prepareMovement(b, new Vector(0, 0.3, 0));
+            use(f, b); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            assertEquals(new Vector(2, 0.3, 0), newVelocity.get(), "Future dash uses acknowledged speed");
+        }
+    }
+
+    @Test void configuredDefinitionAdminRoutesAndStartupValidationCoverEveryQuickstepSetting() throws Exception {
+        java.nio.file.Files.writeString(data.resolve("config.yml"),
+            "quickstep-cooldown-seconds: 2\nquickstep-distance-blocks: 6\nquickstep-speed-blocks-per-tick: 1.5\n");
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var registry = (games.dmg.fantasystick.ability.AbilityRegistry)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "abilityRegistry");
+            var definition = registry.find("quickstep").orElseThrow();
+            assertEquals(java.time.Duration.ofSeconds(2), definition.cooldown());
+            assertEquals(0, new java.math.BigDecimal("6").compareTo(definition.parameters().get("distance")));
+            assertEquals(0, new java.math.BigDecimal("1.5").compareTo(definition.parameters().get("speed")));
+            var sender = new EquipmentAdminCommandNativeTest.Sender();
+            assertEquals(List.of("config", "inspect", "recover"),
+                f.command.tabComplete(sender.port, "fantasystick", new String[]{""}));
+            assertEquals(List.of("config"), f.command.tabComplete(sender.port, "fantasystick", new String[]{"co"}));
+            assertTrue(f.command.tabComplete(sender.port, "fantasystick", new String[]{"unsupported"}).isEmpty());
+            sender.allowed = false;
+            assertTrue(f.command.tabComplete(sender.port, "fantasystick", new String[]{"config", "quickstep"}).isEmpty());
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "quickstep-distance-blocks", "7"});
+            assertTrue(sender.messages.getLast().contains("Permission denied")); sender.allowed = true;
+            assertEquals(List.of("quickstep-cooldown-seconds", "quickstep-distance-blocks", "quickstep-speed-blocks-per-tick"),
+                f.command.tabComplete(sender.port, "fantasystick", new String[]{"config", "quickstep-"}));
+            assertEquals(List.of("4", "6"), f.command.tabComplete(sender.port, "fantasystick",
+                new String[]{"config", "quickstep-distance-blocks", ""}));
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "quickstep-distance-blocks"});
+            assertTrue(sender.messages.getLast().contains("=6"));
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "quickstep-distance-blocks", "7"});
+            var response = f.tasks.poll(5, java.util.concurrent.TimeUnit.SECONDS); assertNotNull(response); response.run();
+            assertEquals(0, new java.math.BigDecimal("7").compareTo(registry.find("quickstep").orElseThrow()
+                .parameters().get("distance")));
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "quickstep-distance-blocks", "0"});
+            assertTrue(sender.messages.getLast().contains("invalid"));
+            f.command.execute(sender.port, "fantasystick",
+                new String[]{"config", "quickstep-distance-blocks", "7", "extra"});
+            assertTrue(sender.messages.getLast().contains("Usage"));
+            f.plugin.setEnabled(false); f.plugin.setEnabled(true);
+            var reloaded = (games.dmg.fantasystick.ability.AbilityRegistry)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "abilityRegistry");
+            assertEquals(0, new java.math.BigDecimal("7").compareTo(reloaded.find("quickstep").orElseThrow()
+                .parameters().get("distance")));
+        }
+        for (String invalid : List.of("quickstep-cooldown-seconds: -1\n", "quickstep-distance-blocks: 0\n",
+                "quickstep-speed-blocks-per-tick: 0\n")) {
+            var directory = data.resolve(Integer.toHexString(invalid.hashCode()));
+            java.nio.file.Files.createDirectories(directory); java.nio.file.Files.writeString(directory.resolve("config.yml"), invalid);
+            try (var f = new FantasyStickLifecycleNativeTest.Fixture(directory)) {
+                assertThrows(IllegalArgumentException.class, () -> f.plugin.setEnabled(true));
+                assertTrue(f.order.isEmpty()); assertTrue(f.recipes.isEmpty());
+            }
+        }
+    }
+
+    private static void learnAndAssign(FantasyStickLifecycleNativeTest.Fixture fixture,
+                                       FantasyStickLifecycleNativeTest.Actor actor) throws Exception {
+        actor.core.inventory.getInventory().setSelectedSlot(0); PartyBookNativeTest.open(fixture, actor);
+        PartyBookNativeTest.click(fixture, actor, abilityButton(actor, "[Learn]", "quickstep"));
+        PartyBookNativeTest.drain(fixture); PartyBookNativeTest.drain(fixture);
+        PartyBookNativeTest.click(fixture, actor, abilityButton(actor, "[3]", "quickstep"));
+        PartyBookNativeTest.drain(fixture); PartyBookNativeTest.drain(fixture);
+    }
+
+    private static AtomicReference<Vector> prepareMovement(FantasyStickLifecycleNativeTest.Actor actor, Vector initial) {
+        var velocity = new AtomicReference<>(initial.clone());
+        doReturn(true).when(actor.player).isOnGround(); doReturn(false).when(actor.player).isFlying();
+        doReturn(false).when(actor.player).isGliding(); doReturn(false).when(actor.player).isInsideVehicle();
+        doAnswer(ignored -> velocity.get().clone()).when(actor.player).getVelocity();
+        doAnswer(call -> { velocity.set(call.getArgument(0, Vector.class).clone()); return null; }).when(actor.player).setVelocity(any(Vector.class));
+        var eye = new Location(actor.world, 0, 65.6, 0); eye.setDirection(new Vector(1, 0, 0));
+        doReturn(eye).when(actor.player).getEyeLocation();
+        return velocity;
+    }
+
+    private static void use(FantasyStickLifecycleNativeTest.Fixture fixture,
+                            FantasyStickLifecycleNativeTest.Actor actor) {
+        actor.core.inventory.getInventory().setSelectedSlot(2);
+        fixture.dispatcher.accept(new PlayerInteractEvent(actor.player, org.bukkit.event.block.Action.RIGHT_CLICK_AIR,
+            actor.core.inventory.getItem(2), null, org.bukkit.block.BlockFace.SELF, EquipmentSlot.HAND));
+    }
+
+    private static ClickEvent.Custom abilityButton(FantasyStickLifecycleNativeTest.Actor actor, String label, String ability) {
+        var book = org.bukkit.craftbukkit.inventory.CraftItemStack.asNMSCopy(actor.books.getLast())
+            .get(net.minecraft.core.component.DataComponents.WRITTEN_BOOK_CONTENT);
+        assertNotNull(book);
+        for (var page : book.pages()) {
+            var found = abilityButton(page.raw(), label, ability);
+            if (found != null) return found;
+        }
+        throw new AssertionError("Missing " + label + " action for " + ability);
+    }
+
+    private static ClickEvent.Custom abilityButton(net.minecraft.network.chat.Component component,
+                                                    String label, String ability) {
+        if (component.getString().equals(label)
+                && component.getStyle().getClickEvent() instanceof ClickEvent.Custom custom
+                && custom.payload().orElse(null) instanceof net.minecraft.nbt.StringTag payload
+                && payload.value().contains(":" + ability)) return custom;
+        for (var child : component.getSiblings()) {
+            var found = abilityButton(child, label, ability);
+            if (found != null) return found;
+        }
+        return null;
+    }
+
+    private static void withStats(Path data, FantasyStickLifecycleNativeTest.Actor actor,
+                                  int dexterity, boolean learned) throws Exception {
+        java.nio.file.Files.createDirectories(data);
+        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.DEX, BigInteger.valueOf(dexterity));
+        repository.replace(new CharacterRecord(old.id(), old.name(), old.revision().add(BigInteger.ONE), stats,
+            old.level(), old.experience(), BigInteger.valueOf(learned ? 39 : 40), old.health(),
+            learned ? java.util.Set.of("quickstep") : old.learned(),
+            learned ? List.of("quickstep", "", "", "", "", "", "") : old.loadout(),
+            old.cooldowns(), old.restrictedKills(), false, null, null), old.revision());
+    }
+}

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

@@ -0,0 +1,214 @@
+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.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.EnumMap;
+import java.util.List;
+import net.minecraft.network.chat.ClickEvent;
+import org.bukkit.event.entity.EntityRegainHealthEvent;
+import org.bukkit.event.player.PlayerInteractEvent;
+import org.bukkit.inventory.EquipmentSlot;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class SecondWindNativeTest {
+    @TempDir Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test void bookAcquisitionActualNativeHealPersistsBeforePublicationAndRetainsCooldown() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); withSecondWind(data, a, false, BigDecimal.valueOf(4));
+            f.players.put(a.core.id, a.player); f.activate(a);
+            a.core.inventory.getInventory().setSelectedSlot(0); PartyBookNativeTest.open(f, a);
+            String text = PartyBookNativeTest.text(a).replaceAll("\\s+", "");
+            assertTrue(text.contains("SecondWind")); assertTrue(text.contains("CON12")); assertTrue(text.contains("WIS12"));
+            PartyBookNativeTest.click(f, a, abilityButton(a, "[Learn]", "second_wind"));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            PartyBookNativeTest.click(f, a, abilityButton(a, "[3]", "second_wind"));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            assertEquals(4, a.player.getHealth());
+            use(f, a); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var storage = (CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            var saved = storage.find(a.core.record.id()).get().orElseThrow();
+            assertEquals(0, BigDecimal.valueOf(11).compareTo(saved.health())); assertEquals(11, a.player.getHealth());
+            assertNotNull(saved.cooldowns().get("second_wind"));
+            assertFalse(a.messages.stream().anyMatch(message -> message.contains("support")));
+            var sheet = a.core.inventory.getItemInOffHand().clone();
+            a.core.inventory.setItemInOffHand(null); f.changed(a); PartyBookNativeTest.drain(f); f.awaitCharacterAndReceipt(a);
+            a.core.inventory.setItemInOffHand(sheet); f.activate(a);
+            assertEquals(11, a.player.getHealth(), "Persisted healing survives exit and resume");
+            a.core.inventory.getInventory().setSelectedSlot(0); PartyBookNativeTest.open(f, a);
+            var unlearn = abilityButton(a, "[Unlearn]", "second_wind");
+            PartyBookNativeTest.click(f, a, unlearn); PartyBookNativeTest.click(f, a, unlearn);
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var refunded = storage.find(a.core.record.id()).get().orElseThrow();
+            assertEquals(BigInteger.valueOf(40), refunded.unspentPoints());
+            assertEquals(saved.cooldowns().get("second_wind"), refunded.cooldowns().get("second_wind"));
+            learnAndAssign(f, a); use(f, a);
+            assertTrue(a.messages.stream().anyMatch(message -> message.contains("ready in")));
+        }
+    }
+
+    @Test void fullHealthAndCancelledNativeHealingApplyNoHealth() throws Exception {
+        for (boolean full : new boolean[]{true, false}) try (var f = new FantasyStickLifecycleNativeTest.Fixture(data.resolve(Boolean.toString(full)))) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data.resolve(Boolean.toString(full)));
+            withSecondWind(data.resolve(Boolean.toString(full)), a, true, BigDecimal.valueOf(full ? 22 : 4));
+            f.players.put(a.core.id, a.player); f.activate(a);
+            if (!full) {
+                class Veto implements org.bukkit.event.Listener {
+                    @org.bukkit.event.EventHandler public void heal(EntityRegainHealthEvent event) {
+                        if (event.getEntity() == a.player && event.getRegainReason() == EntityRegainHealthEvent.RegainReason.CUSTOM) {
+                            event.setCancelled(true);
+                        }
+                    }
+                }
+                f.dispatcher.register(new Veto(), f.plugin);
+            }
+            double before = a.player.getHealth(); use(f, a); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            assertEquals(before, a.player.getHealth());
+            var storage = (CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            var saved = storage.find(a.core.record.id()).get().orElseThrow();
+            if (full) assertFalse(saved.cooldowns().containsKey("second_wind"));
+            else assertNotNull(saved.cooldowns().get("second_wind"));
+        }
+    }
+
+    @Test void failedHealthPersistencePublishesNoNativeHealing() {
+        var characters = mock(CharacterStorage.class);
+        var sessions = mock(games.dmg.fantasystick.session.EquipmentSessions.class);
+        var player = mock(org.bukkit.entity.Player.class);
+        var attribute = mock(org.bukkit.attribute.AttributeInstance.class);
+        when(player.getAttribute(org.bukkit.attribute.Attribute.MAX_HEALTH)).thenReturn(attribute);
+        when(attribute.getValue()).thenReturn(22.0); when(player.getHealth()).thenReturn(4.0);
+        var stats = new EnumMap<Stat, BigInteger>(Stat.class);
+        for (Stat stat : Stat.values()) stats.put(stat, BigInteger.ZERO);
+        stats.put(Stat.CON, BigInteger.valueOf(12)); stats.put(Stat.WIS, BigInteger.valueOf(12));
+        var base = new games.dmg.fantasystick.crafting.CharacterFactory().create(
+            games.dmg.fantasystick.progression.ProgressionRules.defaults());
+        var record = new CharacterRecord(base.id(), base.name(), BigInteger.ONE, stats, base.level(), base.experience(),
+            base.unspentPoints(), BigDecimal.valueOf(4), java.util.Set.of("second_wind"),
+            List.of("second_wind", "", "", "", "", "", ""), base.cooldowns(), base.restrictedKills(), false, null, null);
+        var input = mock(games.dmg.fantasystick.session.ControlInput.class);
+        var active = new games.dmg.fantasystick.session.EquipmentSessions.Active(java.util.UUID.randomUUID(),
+            java.util.UUID.randomUUID(), record.id());
+        when(input.player()).thenReturn(player); when(input.session()).thenReturn(active);
+        var execution = mock(games.dmg.fantasystick.ability.AbilityExecution.class);
+        var effect = new games.dmg.fantasystick.ability.SecondWind(
+            games.dmg.fantasystick.ability.SecondWind.Settings.defaults(), characters, sessions, Runnable::run,
+            ignored -> {}, () -> BigDecimal.valueOf(1024));
+        when(execution.stillCurrent()).thenReturn(true); when(execution.input()).thenReturn(input);
+        when(execution.character()).thenReturn(record); when(execution.definition()).thenReturn(effect.definition());
+        var failure = new java.util.concurrent.CompletableFuture<java.util.Optional<CharacterRecord>>();
+        when(characters.saveHealth(eq(record.id()), eq(record.revision()), any(), any())).thenReturn(failure);
+        effect.activate(execution); verify(player, never()).setHealth(anyDouble());
+        failure.completeExceptionally(new java.io.IOException("simulated health save failure"));
+        verify(player, never()).setHealth(anyDouble()); verify(execution).finish();
+    }
+
+    @Test void configuredDefinitionFormulaAndAdminRoutesCoverBothSettings() throws Exception {
+        java.nio.file.Files.writeString(data.resolve("config.yml"),
+            "second-wind-base-healing: 8\nsecond-wind-cooldown-seconds: 20\n");
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var registry = (games.dmg.fantasystick.ability.AbilityRegistry)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "abilityRegistry");
+            var definition = registry.find("second_wind").orElseThrow();
+            assertEquals(java.time.Duration.ofSeconds(20), definition.cooldown());
+            assertEquals(new BigDecimal("8"), definition.parameters().get("base-healing"));
+            assertEquals(BigInteger.valueOf(7), games.dmg.fantasystick.ability.SecondWind.healing(BigInteger.valueOf(12)));
+            assertEquals(BigInteger.TEN.pow(500).subtract(BigInteger.TEN).divide(BigInteger.TWO).add(BigInteger.valueOf(6)),
+                games.dmg.fantasystick.ability.SecondWind.healing(BigInteger.TEN.pow(500)));
+            var sender = new EquipmentAdminCommandNativeTest.Sender();
+            assertEquals(List.of("config", "inspect", "recover"),
+                f.command.tabComplete(sender.port, "fantasystick", new String[]{""}));
+            sender.allowed = false;
+            assertTrue(f.command.tabComplete(sender.port, "fantasystick", new String[]{"config", "second"}).isEmpty());
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "second-wind-base-healing", "9"});
+            assertTrue(sender.messages.getLast().contains("Permission denied")); sender.allowed = true;
+            assertEquals(List.of("second-wind-base-healing", "second-wind-cooldown-seconds"),
+                f.command.tabComplete(sender.port, "fantasystick", new String[]{"config", "second-wind-"}));
+            assertEquals(List.of("6", "8"), f.command.tabComplete(sender.port, "fantasystick",
+                new String[]{"config", "second-wind-base-healing", ""}));
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "second-wind-base-healing"});
+            assertTrue(sender.messages.getLast().contains("=8"));
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "second-wind-base-healing", "9"});
+            var response = f.tasks.poll(5, java.util.concurrent.TimeUnit.SECONDS); assertNotNull(response); response.run();
+            assertEquals(new BigDecimal("9"), registry.find("second_wind").orElseThrow().parameters().get("base-healing"));
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); withSecondWind(data, a, true, BigDecimal.valueOf(4));
+            f.players.put(a.core.id, a.player); f.activate(a); use(f, a);
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            assertEquals(14, a.player.getHealth(), "Future cast uses acknowledged base healing");
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "second-wind-base-healing", "-1"});
+            assertTrue(sender.messages.getLast().contains("invalid"));
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "second-wind-base-healing", "9", "extra"});
+            assertTrue(sender.messages.getLast().contains("Usage"));
+            f.plugin.setEnabled(false); f.plugin.setEnabled(true);
+            var reloaded = (games.dmg.fantasystick.ability.AbilityRegistry)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "abilityRegistry");
+            assertEquals(new BigDecimal("9"), reloaded.find("second_wind").orElseThrow().parameters().get("base-healing"));
+        }
+        for (String invalid : List.of("second-wind-base-healing: -1\n", "second-wind-cooldown-seconds: -1\n")) {
+            var directory = data.resolve(Integer.toHexString(invalid.hashCode()));
+            java.nio.file.Files.createDirectories(directory); java.nio.file.Files.writeString(directory.resolve("config.yml"), invalid);
+            try (var f = new FantasyStickLifecycleNativeTest.Fixture(directory)) {
+                assertThrows(IllegalArgumentException.class, () -> f.plugin.setEnabled(true));
+                assertTrue(f.order.isEmpty());
+            }
+        }
+    }
+
+    private static void learnAndAssign(FantasyStickLifecycleNativeTest.Fixture fixture,
+                                       FantasyStickLifecycleNativeTest.Actor actor) throws Exception {
+        actor.core.inventory.getInventory().setSelectedSlot(0); PartyBookNativeTest.open(fixture, actor);
+        PartyBookNativeTest.click(fixture, actor, abilityButton(actor, "[Learn]", "second_wind"));
+        PartyBookNativeTest.drain(fixture); PartyBookNativeTest.drain(fixture);
+        PartyBookNativeTest.click(fixture, actor, abilityButton(actor, "[3]", "second_wind"));
+        PartyBookNativeTest.drain(fixture); PartyBookNativeTest.drain(fixture);
+    }
+
+    private static void use(FantasyStickLifecycleNativeTest.Fixture fixture,
+                            FantasyStickLifecycleNativeTest.Actor actor) {
+        actor.core.inventory.getInventory().setSelectedSlot(2);
+        fixture.dispatcher.accept(new PlayerInteractEvent(actor.player, org.bukkit.event.block.Action.RIGHT_CLICK_AIR,
+            actor.core.inventory.getItem(2), null, org.bukkit.block.BlockFace.SELF, EquipmentSlot.HAND));
+    }
+
+    private static ClickEvent.Custom abilityButton(FantasyStickLifecycleNativeTest.Actor actor, String label, String ability) {
+        var book = org.bukkit.craftbukkit.inventory.CraftItemStack.asNMSCopy(actor.books.getLast())
+            .get(net.minecraft.core.component.DataComponents.WRITTEN_BOOK_CONTENT);
+        assertNotNull(book);
+        for (var page : book.pages()) { var found = abilityButton(page.raw(), label, ability); if (found != null) return found; }
+        throw new AssertionError("Missing " + label + " action for " + ability);
+    }
+    private static ClickEvent.Custom abilityButton(net.minecraft.network.chat.Component component, String label, String ability) {
+        if (component.getString().equals(label) && component.getStyle().getClickEvent() instanceof ClickEvent.Custom custom
+                && custom.payload().orElse(null) instanceof net.minecraft.nbt.StringTag payload
+                && payload.value().contains(":" + ability)) return custom;
+        for (var child : component.getSiblings()) { var found = abilityButton(child, label, ability); if (found != null) return found; }
+        return null;
+    }
+
+    private static void withSecondWind(Path data, FantasyStickLifecycleNativeTest.Actor actor,
+                                       boolean learned, BigDecimal health) throws Exception {
+        java.nio.file.Files.createDirectories(data);
+        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.CON, BigInteger.valueOf(12)); stats.put(Stat.WIS, BigInteger.valueOf(12));
+        repository.replace(new CharacterRecord(old.id(), old.name(), old.revision().add(BigInteger.ONE), stats,
+            old.level(), old.experience(), BigInteger.valueOf(learned ? 39 : 40), health,
+            learned ? java.util.Set.of("second_wind") : old.learned(),
+            learned ? List.of("second_wind", "", "", "", "", "", "") : old.loadout(),
+            old.cooldowns(), old.restrictedKills(), false, null, null), old.revision());
+    }
+}

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

@@ -0,0 +1,329 @@
+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.persistence.CharacterRecord;
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import games.dmg.fantasystick.progression.Stat;
+import java.math.BigInteger;
+import java.nio.file.Path;
+import java.util.EnumMap;
+import java.util.List;
+import net.minecraft.network.chat.ClickEvent;
+import org.bukkit.Location;
+import org.bukkit.event.entity.EntityDamageByEntityEvent;
+import org.bukkit.event.entity.EntityDamageEvent;
+import org.bukkit.util.Vector;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class ShieldBashNativeTest {
+    @TempDir Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test void bookAcquisitionAndEquippedAttackReplaceVanillaDamageThenKnockBack() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); withShieldBash(data, a, false);
+            f.players.put(a.core.id, a.player); f.activate(a);
+            a.core.inventory.getInventory().setSelectedSlot(0); PartyBookNativeTest.open(f, a);
+            String book = PartyBookNativeTest.text(a).replaceAll("\\s+", "");
+            assertTrue(book.contains("ShieldBash")); assertTrue(book.contains("STR12")); assertTrue(book.contains("CON12"));
+            assertTrue(book.contains("Cost:1")); assertTrue(book.contains("3")); assertTrue(book.contains("6s"));
+            PartyBookNativeTest.click(f, a, abilityButton(a, "[Learn]", "shield_bash"));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            PartyBookNativeTest.click(f, a, abilityButton(a, "[3]", "shield_bash"));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var storage = (CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            assertEquals(BigInteger.valueOf(39), storage.find(a.core.record.id()).get().orElseThrow().unspentPoints());
+            assertEquals(org.bukkit.Material.SHIELD, a.core.inventory.getItem(2).getType());
+            a.core.inventory.getInventory().setSelectedSlot(2);
+            var block = new org.bukkit.event.player.PlayerInteractEvent(a.player,
+                org.bukkit.event.block.Action.RIGHT_CLICK_AIR, a.core.inventory.getItem(2), null,
+                org.bukkit.block.BlockFace.SELF, org.bukkit.inventory.EquipmentSlot.HAND);
+            f.dispatcher.accept(block); assertTrue(block.isCancelled(), "Contained shield cannot start ordinary blocking");
+            assertFalse(storage.find(a.core.record.id()).get().orElseThrow().cooldowns().containsKey("shield_bash"));
+
+            var target = mock(org.bukkit.entity.LivingEntity.class);
+            when(target.getUniqueId()).thenReturn(java.util.UUID.randomUUID()); when(target.getType()).thenReturn(org.bukkit.entity.EntityType.ZOMBIE);
+            when(a.world.getUID()).thenReturn(java.util.UUID.randomUUID());
+            var origin = new Location(a.world, 0, 64, 0); var destination = new Location(a.world, 2, 64, 0);
+            doReturn(origin).when(a.player).getLocation(); when(target.getLocation()).thenReturn(destination);
+            doReturn(true).when(a.player).hasLineOfSight(target); when(target.getVelocity()).thenReturn(new Vector(0.1, 0.2, 0));
+            var applied = new java.util.concurrent.atomic.AtomicReference<Vector>();
+            doAnswer(call -> { applied.set(call.getArgument(0)); return null; }).when(target).setVelocity(any(Vector.class));
+            var damages = new java.util.ArrayList<EntityDamageByEntityEvent>();
+            doAnswer(call -> {
+                var source = (org.bukkit.damage.DamageSource) call.getArgument(1);
+                var event = new EntityDamageByEntityEvent(a.player, target, EntityDamageEvent.DamageCause.ENTITY_ATTACK,
+                    source, (Double) call.getArgument(0)); damages.add(event); f.dispatcher.accept(event); return null;
+            }).when(target).damage(anyDouble(), any(org.bukkit.damage.DamageSource.class));
+            a.core.inventory.getInventory().setSelectedSlot(2);
+            var attack = new io.papermc.paper.event.player.PrePlayerAttackEntityEvent(a.player, target, true);
+            f.dispatcher.accept(attack); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            assertTrue(attack.isCancelled(), "Contained shield cannot continue into vanilla damage/blocking");
+            assertEquals(1, damages.size()); assertEquals(5, damages.getFirst().getDamage(), 1.0e-9);
+            assertEquals(new Vector(0.9, 0.35, 0), applied.get());
+            assertNotNull(storage.find(a.core.record.id()).get().orElseThrow().cooldowns().get("shield_bash"));
+            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());
+            f.dispatcher.accept(new io.papermc.paper.event.player.PrePlayerAttackEntityEvent(a.player, target, true));
+            PartyBookNativeTest.drain(f); assertEquals(1, damages.size());
+            assertTrue(a.messages.stream().anyMatch(message -> message.contains("ready in")));
+        }
+    }
+
+    @Test void outOfRangeOrObstructedTargetRefusesBeforeCooldownWhileStillContainingShield() throws Exception {
+        for (int route = 0; route < 2; route++) {
+            var directory = data.resolve("refused-" + route);
+            try (var f = new FantasyStickLifecycleNativeTest.Fixture(directory)) {
+                f.plugin.setEnabled(true); var a = new FantasyStickLifecycleNativeTest.Actor(directory);
+                withShieldBash(directory, a, true); f.players.put(a.core.id, a.player); f.activate(a);
+                var target = mock(org.bukkit.entity.LivingEntity.class);
+                when(target.getUniqueId()).thenReturn(java.util.UUID.randomUUID()); when(target.getType()).thenReturn(org.bukkit.entity.EntityType.ZOMBIE);
+                doReturn(new Location(a.world, 0, 64, 0)).when(a.player).getLocation();
+                when(target.getLocation()).thenReturn(new Location(a.world, route == 0 ? 4 : 2, 64, 0));
+                doReturn(route == 0).when(a.player).hasLineOfSight(target);
+                a.core.inventory.getInventory().setSelectedSlot(2);
+                var attack = new io.papermc.paper.event.player.PrePlayerAttackEntityEvent(a.player, target, true);
+                f.dispatcher.accept(attack); assertTrue(attack.isCancelled());
+                verify(target, never()).damage(anyDouble(), any(org.bukkit.damage.DamageSource.class));
+                var storage = (CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+                assertFalse(storage.find(a.core.record.id()).get().orElseThrow().cooldowns().containsKey("shield_bash"));
+            }
+        }
+    }
+
+    @Test void partyAndMixedModePlayerTargetsAreRefusedWithoutFreeVanillaHits() throws Exception {
+        try(var f=new FantasyStickLifecycleNativeTest.Fixture(data)){
+            f.plugin.setEnabled(true);var a=new FantasyStickLifecycleNativeTest.Actor(data);var b=new FantasyStickLifecycleNativeTest.Actor(data);
+            withShieldBash(data,a,true);f.players.put(a.core.id,a.player);f.players.put(b.core.id,b.player);f.activate(a);f.activate(b);
+            var parties=PartyLifecycleNativeTest.parties(f);var party=parties.create(a.core.id).orElseThrow();
+            assertTrue(parties.accept(b.core.id,parties.invite(a.core.id,party.id(),b.core.id).orElseThrow().id()));
+            a.core.inventory.getInventory().setSelectedSlot(2);
+            var friendly=new io.papermc.paper.event.player.PrePlayerAttackEntityEvent(a.player,b.player,true);f.dispatcher.accept(friendly);
+            assertTrue(friendly.isCancelled());verify(b.player,never()).damage(anyDouble(),any(org.bukkit.damage.DamageSource.class));
+            var ordinary=mock(org.bukkit.entity.Player.class);when(ordinary.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+            var mixed=new io.papermc.paper.event.player.PrePlayerAttackEntityEvent(a.player,ordinary,true);f.dispatcher.accept(mixed);
+            assertTrue(mixed.isCancelled());verify(ordinary,never()).damage(anyDouble(),any(org.bukkit.damage.DamageSource.class));
+            var storage=(CharacterStorage)FantasyStickLifecycleNativeTest.Fixture.field(f.plugin,"characters");
+            assertFalse(storage.find(a.core.record.id()).get().orElseThrow().cooldowns().containsKey("shield_bash"));
+        }
+    }
+
+    @Test void cancelledDamageAppliesNoKnockbackAndNeverRefundsAcknowledgedCooldown() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true); var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            withShieldBash(data, a, true); f.players.put(a.core.id, a.player); f.activate(a);
+            var target = mock(org.bukkit.entity.LivingEntity.class); when(target.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+            when(target.getType()).thenReturn(org.bukkit.entity.EntityType.ZOMBIE);
+            doReturn(new Location(a.world, 0, 64, 0)).when(a.player).getLocation();
+            when(target.getLocation()).thenReturn(new Location(a.world, 2, 64, 0)); doReturn(true).when(a.player).hasLineOfSight(target);
+            doAnswer(call -> {
+                var source = (org.bukkit.damage.DamageSource) call.getArgument(1);
+                var event = new EntityDamageByEntityEvent(a.player, target, EntityDamageEvent.DamageCause.ENTITY_ATTACK,
+                    source, (Double) call.getArgument(0)); event.setCancelled(true); f.dispatcher.accept(event); return null;
+            }).when(target).damage(anyDouble(), any(org.bukkit.damage.DamageSource.class));
+            a.core.inventory.getInventory().setSelectedSlot(2);
+            f.dispatcher.accept(new io.papermc.paper.event.player.PrePlayerAttackEntityEvent(a.player, target, true));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f); verify(target, never()).setVelocity(any(Vector.class));
+            var storage = (CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            assertNotNull(storage.find(a.core.record.id()).get().orElseThrow().cooldowns().get("shield_bash"));
+        }
+    }
+
+    @Test void cancelledPlayerVelocityPreservesMovementAfterAcceptedDamage() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true); var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            var b = new FantasyStickLifecycleNativeTest.Actor(data); withShieldBash(data, a, true);
+            f.players.put(a.core.id, a.player); f.players.put(b.core.id, b.player); f.activate(a); f.activate(b);
+            doReturn(new Location(a.world, 0, 64, 0)).when(a.player).getLocation();
+            doReturn(new Location(a.world, 2, 64, 0)).when(b.player).getLocation();
+            doReturn(true).when(a.player).hasLineOfSight(b.player); doReturn(new Vector(0.1, 0.2, 0)).when(b.player).getVelocity();
+            class Veto implements org.bukkit.event.Listener {
+                @org.bukkit.event.EventHandler public void velocity(org.bukkit.event.player.PlayerVelocityEvent event) {
+                    if (event.getPlayer() == b.player) event.setCancelled(true);
+                }
+            }
+            f.dispatcher.register(new Veto(), f.plugin);
+            doAnswer(call -> {
+                var source = (org.bukkit.damage.DamageSource) call.getArgument(1);
+                f.dispatcher.accept(new EntityDamageByEntityEvent(a.player, b.player, EntityDamageEvent.DamageCause.ENTITY_ATTACK,
+                    source, (Double) call.getArgument(0))); return null;
+            }).when(b.player).damage(anyDouble(), any(org.bukkit.damage.DamageSource.class));
+            a.core.inventory.getInventory().setSelectedSlot(2);
+            f.dispatcher.accept(new io.papermc.paper.event.player.PrePlayerAttackEntityEvent(a.player, b.player, true));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f); verify(b.player, never()).setVelocity(any(Vector.class));
+        }
+    }
+
+    @Test void unlearnRelearnAndCharacterTransferRetainCooldown() throws Exception {
+        java.nio.file.Files.writeString(data.resolve("config.yml"), "shield-bash-cooldown-seconds: 60\n");
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true); var a = new FantasyStickLifecycleNativeTest.Actor(data);
+            withShieldBash(data, a, true); f.players.put(a.core.id, a.player); f.activate(a);
+            var target = mock(org.bukkit.entity.LivingEntity.class); when(target.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+            when(target.getType()).thenReturn(org.bukkit.entity.EntityType.ZOMBIE);
+            doReturn(new Location(a.world, 0, 64, 0)).when(a.player).getLocation();
+            when(target.getLocation()).thenReturn(new Location(a.world, 2, 64, 0)); doReturn(true).when(a.player).hasLineOfSight(target);
+            when(target.getVelocity()).thenReturn(new Vector()); var hits = new java.util.concurrent.atomic.AtomicInteger();
+            doAnswer(call -> { hits.incrementAndGet(); var source = (org.bukkit.damage.DamageSource) call.getArgument(1);
+                f.dispatcher.accept(new EntityDamageByEntityEvent(a.player, target, EntityDamageEvent.DamageCause.ENTITY_ATTACK,
+                    source, (Double) call.getArgument(0))); return null; }).when(target).damage(anyDouble(), any(org.bukkit.damage.DamageSource.class));
+            a.core.inventory.getInventory().setSelectedSlot(2);
+            f.dispatcher.accept(new io.papermc.paper.event.player.PrePlayerAttackEntityEvent(a.player, target, true));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f); assertEquals(1, hits.get());
+            var storage = (CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            var deadline = storage.find(a.core.record.id()).get().orElseThrow().cooldowns().get("shield_bash");
+            a.core.inventory.getInventory().setSelectedSlot(0); PartyBookNativeTest.open(f, a);
+            var unlearn = abilityButton(a, "[Unlearn]", "shield_bash");
+            PartyBookNativeTest.click(f, a, unlearn); PartyBookNativeTest.click(f, a, unlearn);
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var refunded = storage.find(a.core.record.id()).get().orElseThrow();
+            assertEquals(BigInteger.valueOf(40), refunded.unspentPoints()); assertEquals(deadline, refunded.cooldowns().get("shield_bash"));
+            learnAndAssign(f, a); a.core.inventory.getInventory().setSelectedSlot(2);
+            f.dispatcher.accept(new io.papermc.paper.event.player.PrePlayerAttackEntityEvent(a.player, target, true));
+            PartyBookNativeTest.drain(f); assertEquals(1, hits.get());
+            var sheet = a.core.inventory.getItemInOffHand().clone();
+            a.core.inventory.setItemInOffHand(null); f.changed(a); PartyBookNativeTest.drain(f); f.awaitCharacterAndReceipt(a);
+            var b = new FantasyStickLifecycleNativeTest.Actor(data); b.core.inventory.setItemInOffHand(sheet);
+            f.players.put(b.core.id, b.player); f.activate(b); b.core.inventory.getInventory().setSelectedSlot(2);
+            doReturn(new Location(a.world, 0, 64, 0)).when(b.player).getLocation(); doReturn(true).when(b.player).hasLineOfSight(target);
+            f.dispatcher.accept(new io.papermc.paper.event.player.PrePlayerAttackEntityEvent(b.player, target, true));
+            PartyBookNativeTest.drain(f); assertEquals(1, hits.get()); assertEquals(deadline,
+                storage.find(a.core.record.id()).get().orElseThrow().cooldowns().get("shield_bash"));
+        }
+    }
+
+    @Test void exactDamageFormulaSupportsFiniteUncappedStats() {
+        assertEquals(BigInteger.valueOf(5), games.dmg.fantasystick.ability.ShieldBash.damage(BigInteger.valueOf(12)));
+        assertEquals(BigInteger.valueOf(3), games.dmg.fantasystick.ability.ShieldBash.damage(BigInteger.valueOf(9)));
+        var huge = BigInteger.TEN.pow(500);
+        assertEquals(huge.subtract(BigInteger.TEN).divide(BigInteger.TWO).add(BigInteger.valueOf(4)),
+            games.dmg.fantasystick.ability.ShieldBash.damage(huge));
+    }
+
+    @Test void failedCooldownPersistenceDealsNoDamageOrKnockback() {
+        var storage=mock(CharacterStorage.class);var sessions=mock(games.dmg.fantasystick.session.EquipmentSessions.class);
+        var parties=new games.dmg.fantasystick.party.PartyRoster(java.time.Clock.systemUTC(),ignored->true);
+        var registry=new games.dmg.fantasystick.ability.AbilityRegistry();var bash=new games.dmg.fantasystick.ability.ShieldBash(
+            games.dmg.fantasystick.ability.ShieldBash.Settings.defaults(),ignored->{});registry.register(bash.definition());
+        var base=new games.dmg.fantasystick.crafting.CharacterFactory().create(games.dmg.fantasystick.progression.ProgressionRules.defaults());
+        var stats=new EnumMap<>(base.stats());stats.put(Stat.STR,BigInteger.valueOf(12));stats.put(Stat.CON,BigInteger.valueOf(12));
+        var record=new CharacterRecord(base.id(),base.name(),base.revision(),stats,base.level(),base.experience(),base.unspentPoints(),base.health(),
+            java.util.Set.of("shield_bash"),List.of("shield_bash","","","","","",""),base.cooldowns(),base.restrictedKills(),false,null,null);
+        var active=new games.dmg.fantasystick.session.EquipmentSessions.Active(java.util.UUID.randomUUID(),java.util.UUID.randomUUID(),record.id());
+        var player=mock(org.bukkit.entity.Player.class);when(player.getUniqueId()).thenReturn(active.player());
+        var world=mock(org.bukkit.World.class);doReturn(new Location(world,0,64,0)).when(player).getLocation();
+        var target=mock(org.bukkit.entity.LivingEntity.class);when(target.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+        when(target.getType()).thenReturn(org.bukkit.entity.EntityType.ZOMBIE);when(target.getLocation()).thenReturn(new Location(world,2,64,0));
+        doReturn(true).when(player).hasLineOfSight(target);when(sessions.current(active)).thenReturn(true);
+        when(sessions.currentRecord(active)).thenReturn(java.util.Optional.of(record));
+        var failed=new java.util.concurrent.CompletableFuture<CharacterStorage.AbilityMutation>();
+        failed.completeExceptionally(new java.io.IOException("simulated cooldown failure"));
+        when(storage.commitAbilityCooldown(eq(record.id()),eq(record.revision()),eq("shield_bash"),any())).thenReturn(failed);
+        var engine=new games.dmg.fantasystick.ability.AbilityEngine(registry,storage,sessions,parties,java.time.Clock.systemUTC(),Runnable::run,
+            (delay,action)->()->{},ignored->{},ignored->{});
+        engine.accept(new games.dmg.fantasystick.session.ControlInput(player,active,2,"shield_bash",
+            games.dmg.fantasystick.session.ControlInput.Kind.ABILITY,games.dmg.fantasystick.session.ControlInput.Gesture.ATTACK,
+            target,0,1,()->true));
+        verify(storage).commitAbilityCooldown(eq(record.id()),eq(record.revision()),eq("shield_bash"),any());
+        verify(target,never()).damage(anyDouble(),any(org.bukkit.damage.DamageSource.class));verify(target,never()).setVelocity(any(Vector.class));
+        engine.close();bash.close();parties.close();
+    }
+
+    @Test void configuredDefinitionAdminRoutesRestartAndFutureStrikeCoverEverySetting() throws Exception {
+        java.nio.file.Files.writeString(data.resolve("config.yml"),
+            "shield-bash-base-damage: 8\nshield-bash-cooldown-seconds: 0\nshield-bash-range-blocks: 5\n" +
+            "shield-bash-horizontal-knockback: 1.2\nshield-bash-minimum-vertical-knockback: 0.5\n");
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true); var registry = (games.dmg.fantasystick.ability.AbilityRegistry)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "abilityRegistry");
+            var definition = registry.find("shield_bash").orElseThrow(); assertEquals(java.time.Duration.ZERO, definition.cooldown());
+            assertEquals(0, new java.math.BigDecimal("8").compareTo(definition.parameters().get("base-damage")));
+            assertEquals(0, new java.math.BigDecimal("5").compareTo(definition.parameters().get("range")));
+            assertEquals(0, new java.math.BigDecimal("1.2").compareTo(definition.parameters().get("horizontal-knockback")));
+            assertEquals(0, new java.math.BigDecimal("0.5").compareTo(definition.parameters().get("minimum-vertical-knockback")));
+            var sender = new EquipmentAdminCommandNativeTest.Sender(); sender.allowed=false;
+            assertTrue(f.command.tabComplete(sender.port,"fantasystick",new String[]{"config","shield-bash"}).isEmpty());
+            f.command.execute(sender.port,"fantasystick",new String[]{"config","shield-bash-base-damage","9"});
+            assertTrue(sender.messages.getLast().contains("Permission denied")); sender.allowed=true;
+            assertEquals(List.of("shield-bash-base-damage","shield-bash-cooldown-seconds","shield-bash-horizontal-knockback",
+                "shield-bash-minimum-vertical-knockback","shield-bash-range-blocks"),
+                f.command.tabComplete(sender.port,"fantasystick",new String[]{"config","shield-bash-"}));
+            assertEquals(List.of("4","8"),f.command.tabComplete(sender.port,"fantasystick",
+                new String[]{"config","shield-bash-base-damage",""}));
+            f.command.execute(sender.port,"fantasystick",new String[]{"config","shield-bash-base-damage"});
+            assertTrue(sender.messages.getLast().contains("=8"));
+            f.command.execute(sender.port,"fantasystick",new String[]{"config","shield-bash-base-damage","9"});
+            var response=f.tasks.poll(5,java.util.concurrent.TimeUnit.SECONDS);assertNotNull(response);response.run();
+            assertEquals(0,new java.math.BigDecimal("9").compareTo(registry.find("shield_bash").orElseThrow().parameters().get("base-damage")));
+            var a=new FantasyStickLifecycleNativeTest.Actor(data);withShieldBash(data,a,true);f.players.put(a.core.id,a.player);f.activate(a);
+            var target=mock(org.bukkit.entity.LivingEntity.class);when(target.getUniqueId()).thenReturn(java.util.UUID.randomUUID());
+            when(target.getType()).thenReturn(org.bukkit.entity.EntityType.ZOMBIE);
+            doReturn(new Location(a.world,0,64,0)).when(a.player).getLocation();when(target.getLocation()).thenReturn(new Location(a.world,4,64,0));
+            doReturn(true).when(a.player).hasLineOfSight(target);when(target.getVelocity()).thenReturn(new Vector());
+            var amount=new java.util.concurrent.atomic.AtomicReference<Double>();var movement=new java.util.concurrent.atomic.AtomicReference<Vector>();
+            doAnswer(call->{amount.set(call.getArgument(0));var source=(org.bukkit.damage.DamageSource)call.getArgument(1);
+                f.dispatcher.accept(new EntityDamageByEntityEvent(a.player,target,EntityDamageEvent.DamageCause.ENTITY_ATTACK,source,(Double)call.getArgument(0)));return null;
+            }).when(target).damage(anyDouble(),any(org.bukkit.damage.DamageSource.class));
+            doAnswer(call->{movement.set(call.getArgument(0));return null;}).when(target).setVelocity(any(Vector.class));
+            a.core.inventory.getInventory().setSelectedSlot(2);f.dispatcher.accept(new io.papermc.paper.event.player.PrePlayerAttackEntityEvent(a.player,target,true));
+            PartyBookNativeTest.drain(f);PartyBookNativeTest.drain(f);assertEquals(10,amount.get(),1.0e-9);assertEquals(new Vector(1.2,0.5,0),movement.get());
+            f.command.execute(sender.port,"fantasystick",new String[]{"config","shield-bash-base-damage","-1"});
+            assertTrue(sender.messages.getLast().contains("invalid"));
+            f.command.execute(sender.port,"fantasystick",new String[]{"config","shield-bash-base-damage","9","extra"});
+            assertTrue(sender.messages.getLast().contains("Usage"));
+            f.plugin.setEnabled(false);f.plugin.setEnabled(true);var reloaded=(games.dmg.fantasystick.ability.AbilityRegistry)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin,"abilityRegistry");
+            assertEquals(0,new java.math.BigDecimal("9").compareTo(reloaded.find("shield_bash").orElseThrow().parameters().get("base-damage")));
+        }
+        for(String invalid:List.of("shield-bash-base-damage: -1\n","shield-bash-cooldown-seconds: -1\n",
+                "shield-bash-range-blocks: 0\n","shield-bash-horizontal-knockback: 9\n",
+                "shield-bash-minimum-vertical-knockback: 9\n")){
+            var directory=data.resolve(Integer.toHexString(invalid.hashCode()));java.nio.file.Files.createDirectories(directory);
+            java.nio.file.Files.writeString(directory.resolve("config.yml"),invalid);
+            try(var f=new FantasyStickLifecycleNativeTest.Fixture(directory)){
+                assertThrows(IllegalArgumentException.class,()->f.plugin.setEnabled(true));assertTrue(f.order.isEmpty());
+            }
+        }
+    }
+
+    private static void learnAndAssign(FantasyStickLifecycleNativeTest.Fixture fixture,
+                                       FantasyStickLifecycleNativeTest.Actor actor) throws Exception {
+        actor.core.inventory.getInventory().setSelectedSlot(0); PartyBookNativeTest.open(fixture, actor);
+        PartyBookNativeTest.click(fixture, actor, abilityButton(actor, "[Learn]", "shield_bash"));
+        PartyBookNativeTest.drain(fixture); PartyBookNativeTest.drain(fixture);
+        PartyBookNativeTest.click(fixture, actor, abilityButton(actor, "[3]", "shield_bash"));
+        PartyBookNativeTest.drain(fixture); PartyBookNativeTest.drain(fixture);
+    }
+
+    private static ClickEvent.Custom abilityButton(FantasyStickLifecycleNativeTest.Actor actor, String label, String ability) {
+        var book = org.bukkit.craftbukkit.inventory.CraftItemStack.asNMSCopy(actor.books.getLast())
+            .get(net.minecraft.core.component.DataComponents.WRITTEN_BOOK_CONTENT); assertNotNull(book);
+        for (var page : book.pages()) { var found = abilityButton(page.raw(), label, ability); if (found != null) return found; }
+        throw new AssertionError("Missing " + label + " for " + ability);
+    }
+    private static ClickEvent.Custom abilityButton(net.minecraft.network.chat.Component component, String label, String ability) {
+        if (component.getString().equals(label) && component.getStyle().getClickEvent() instanceof ClickEvent.Custom custom
+                && custom.payload().orElse(null) instanceof net.minecraft.nbt.StringTag payload
+                && payload.value().contains(":" + ability)) return custom;
+        for (var child : component.getSiblings()) { var found = abilityButton(child, label, ability); if (found != null) return found; }
+        return null;
+    }
+    private static void withShieldBash(Path data, FantasyStickLifecycleNativeTest.Actor actor, boolean learned) throws Exception {
+        java.nio.file.Files.createDirectories(data);
+        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(12)); 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(learned ? 39 : 40), old.health(),
+            learned ? java.util.Set.of("shield_bash") : old.learned(),
+            learned ? List.of("shield_bash", "", "", "", "", "", "") : old.loadout(),
+            old.cooldowns(), old.restrictedKills(), false, null, null), old.revision());
+    }
+}

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

@@ -0,0 +1,294 @@
+package games.dmg.fantasystick;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+import games.dmg.fantasystick.persistence.CharacterRecord;
+import games.dmg.fantasystick.persistence.CharacterStorage;
+import games.dmg.fantasystick.progression.Stat;
+import java.math.BigInteger;
+import java.nio.file.Path;
+import java.util.EnumMap;
+import java.util.List;
+import net.minecraft.network.chat.ClickEvent;
+import org.bukkit.event.entity.EntityDamageByEntityEvent;
+import org.bukkit.event.entity.EntityDamageEvent;
+import org.bukkit.event.player.PlayerInteractEvent;
+import org.bukkit.inventory.EquipmentSlot;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class StoneSkinNativeTest {
+    @TempDir Path data;
+    @BeforeAll static void bootstrap() throws Exception { NativeRuntime.bootstrap(); }
+
+    @Test void bookAcquisitionEquippedUseReducesNativeEntityDamageForFourSeconds() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); withStoneSkin(data, a, false);
+            f.players.put(a.core.id, a.player); f.activate(a);
+            a.core.inventory.getInventory().setSelectedSlot(0); PartyBookNativeTest.open(f, a);
+            String text = PartyBookNativeTest.text(a).replaceAll("\\s+", "");
+            assertTrue(text.contains("StoneSkin")); assertTrue(text.contains("CON14"));
+            assertTrue(text.contains("Cost:1")); assertTrue(text.contains("25%")); assertTrue(text.contains("4s"));
+            PartyBookNativeTest.click(f, a, abilityButton(a, "[Learn]", "stone_skin"));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            PartyBookNativeTest.click(f, a, abilityButton(a, "[3]", "stone_skin"));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var storage = (CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            assertEquals(BigInteger.valueOf(39), storage.find(a.core.record.id()).get().orElseThrow().unspentPoints());
+            use(f, a); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            assertNotNull(storage.find(a.core.record.id()).get().orElseThrow().cooldowns().get("stone_skin"));
+            var attacker = mock(org.bukkit.entity.Zombie.class);
+            var hit = new EntityDamageByEntityEvent(attacker, a.player,
+                EntityDamageEvent.DamageCause.ENTITY_ATTACK, mock(org.bukkit.damage.DamageSource.class), 8);
+            f.dispatcher.accept(hit); assertEquals(6, hit.getDamage(), 1.0e-9);
+            assertEquals(80L, f.delayedTicks.getLast());
+            f.delayed.getLast().run();
+            var expired = new EntityDamageByEntityEvent(attacker, a.player,
+                EntityDamageEvent.DamageCause.ENTITY_ATTACK, mock(org.bukkit.damage.DamageSource.class), 8);
+            f.dispatcher.accept(expired); assertEquals(8, expired.getDamage(), 1.0e-9);
+            var deadline = storage.find(a.core.record.id()).get().orElseThrow().cooldowns().get("stone_skin");
+            a.core.inventory.getInventory().setSelectedSlot(0); PartyBookNativeTest.open(f, a);
+            var unlearn = abilityButton(a, "[Unlearn]", "stone_skin");
+            PartyBookNativeTest.click(f, a, unlearn); PartyBookNativeTest.click(f, a, unlearn);
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var refunded = storage.find(a.core.record.id()).get().orElseThrow();
+            assertEquals(BigInteger.valueOf(40), refunded.unspentPoints()); assertEquals(deadline, refunded.cooldowns().get("stone_skin"));
+            a.core.inventory.getInventory().setSelectedSlot(0); PartyBookNativeTest.open(f, a);
+            PartyBookNativeTest.click(f, a, abilityButton(a, "[Learn]", "stone_skin"));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            PartyBookNativeTest.click(f, a, abilityButton(a, "[3]", "stone_skin"));
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f); use(f, a);
+            assertTrue(a.messages.stream().anyMatch(message -> message.contains("ready in")));
+        }
+    }
+
+    @Test void environmentalAndCancelledDamageRemainUntouchedWhileProjectileCombatIsReduced() throws Exception {
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); withStoneSkin(data, a, true);
+            f.players.put(a.core.id, a.player); f.activate(a); use(f, a);
+            PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var fall = new EntityDamageEvent(a.player, EntityDamageEvent.DamageCause.FALL,
+                mock(org.bukkit.damage.DamageSource.class), 8);
+            f.dispatcher.accept(fall); assertEquals(8, fall.getDamage(), 1.0e-9);
+            var arrow = mock(org.bukkit.entity.Arrow.class);
+            var projectile = new EntityDamageByEntityEvent(arrow, a.player,
+                EntityDamageEvent.DamageCause.PROJECTILE, mock(org.bukkit.damage.DamageSource.class), 8);
+            f.dispatcher.accept(projectile); assertEquals(6, projectile.getDamage(), 1.0e-9);
+            class Veto implements org.bukkit.event.Listener {
+                @org.bukkit.event.EventHandler(priority = org.bukkit.event.EventPriority.LOWEST)
+                public void veto(EntityDamageByEntityEvent event) { event.setCancelled(true); }
+            }
+            f.dispatcher.register(new Veto(), f.plugin);
+            var cancelled = new EntityDamageByEntityEvent(mock(org.bukkit.entity.Zombie.class), a.player,
+                EntityDamageEvent.DamageCause.ENTITY_ATTACK, mock(org.bukkit.damage.DamageSource.class), 8);
+            f.dispatcher.accept(cancelled); assertTrue(cancelled.isCancelled()); assertEquals(8, cancelled.getDamage(), 1.0e-9);
+        }
+    }
+
+    @Test void replacementExpirySessionExitAndTransferRemoveOnlyOwnedReductionAndRetainDeadline() throws Exception {
+        java.nio.file.Files.writeString(data.resolve("config.yml"),
+            "stone-skin-cooldown-seconds: 0\nstone-skin-duration-seconds: 4\nstone-skin-damage-reduction-percent: 25\n");
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); withStoneSkin(data, a, true);
+            f.players.put(a.core.id, a.player); f.activate(a); use(f, a); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            use(f, a); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            assertEquals(2, f.delayed.size());
+            f.delayed.getFirst().run();
+            assertEquals(6, hit(f, a, 8).getDamage(), 1.0e-9, "Old expiry cannot remove replacement protection");
+            f.delayed.getLast().run();
+            assertEquals(8, hit(f, a, 8).getDamage(), 1.0e-9);
+            use(f, a); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var storage = (CharacterStorage) FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "characters");
+            var deadline = storage.find(a.core.record.id()).get().orElseThrow().cooldowns().get("stone_skin");
+            var sheet = a.core.inventory.getItemInOffHand().clone();
+            a.core.inventory.setItemInOffHand(null); f.changed(a); PartyBookNativeTest.drain(f); f.awaitCharacterAndReceipt(a);
+            assertEquals(8, hit(f, a, 8).getDamage(), 1.0e-9, "Exit clears owned reduction");
+            assertEquals(deadline, storage.find(a.core.record.id()).get().orElseThrow().cooldowns().get("stone_skin"));
+            var b = new FantasyStickLifecycleNativeTest.Actor(data); b.core.inventory.setItemInOffHand(sheet);
+            f.players.put(b.core.id, b.player); f.activate(b);
+            assertEquals(deadline, storage.find(a.core.record.id()).get().orElseThrow().cooldowns().get("stone_skin"));
+        }
+    }
+
+    @Test void acknowledgedConfigurationAffectsFutureCastsWhileActiveProtectionKeepsSnapshot() throws Exception {
+        java.nio.file.Files.writeString(data.resolve("config.yml"),
+            "stone-skin-cooldown-seconds: 0\nstone-skin-duration-seconds: 4\nstone-skin-damage-reduction-percent: 25\n");
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var a = new FantasyStickLifecycleNativeTest.Actor(data); withStoneSkin(data, a, true);
+            f.players.put(a.core.id, a.player); f.activate(a); use(f, a); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            var sender = new EquipmentAdminCommandNativeTest.Sender();
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "stone-skin-duration-seconds", "6"});
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "stone-skin-damage-reduction-percent", "50"});
+            for (int i = 0; i < 2; i++) { var response = f.tasks.poll(5, java.util.concurrent.TimeUnit.SECONDS); assertNotNull(response); response.run(); }
+            assertEquals(6, hit(f, a, 8).getDamage(), 1.0e-9, "Active cast retains captured 25 percent");
+            assertEquals(80L, f.delayedTicks.getFirst());
+            var b = new FantasyStickLifecycleNativeTest.Actor(data); withStoneSkin(data, b, true);
+            f.players.put(b.core.id, b.player); f.activate(b); use(f, b); PartyBookNativeTest.drain(f); PartyBookNativeTest.drain(f);
+            assertEquals(4, hit(f, b, 8).getDamage(), 1.0e-9); assertEquals(120L, f.delayedTicks.getLast());
+        }
+    }
+
+    @Test void acceptedDamageReportsExactPreventionWhileCancelledDamageReportsNothing() {
+        var mitigation = new games.dmg.fantasystick.ability.CombatMitigation();
+        var stone = new games.dmg.fantasystick.ability.StoneSkin(
+            games.dmg.fantasystick.ability.StoneSkin.Settings.defaults(), mitigation);
+        var execution = mock(games.dmg.fantasystick.ability.AbilityExecution.class);
+        var input = mock(games.dmg.fantasystick.session.ControlInput.class);
+        var player = mock(org.bukkit.entity.Player.class); var id = java.util.UUID.randomUUID();
+        when(player.getUniqueId()).thenReturn(id); when(input.player()).thenReturn(player);
+        when(execution.input()).thenReturn(input); when(execution.definition()).thenReturn(stone.definition());
+        when(execution.stillCurrent()).thenReturn(true);
+        stone.activate(execution);
+        var weaker = mock(games.dmg.fantasystick.ability.AbilityExecution.class);
+        when(weaker.stillCurrent()).thenReturn(true);
+        var unrelated = mitigation.grant(weaker, player, new java.math.BigDecimal("20"));
+        var accepted = new EntityDamageByEntityEvent(mock(org.bukkit.entity.Zombie.class), player,
+            EntityDamageEvent.DamageCause.ENTITY_ATTACK, mock(org.bukkit.damage.DamageSource.class), 8);
+        mitigation.reduce(accepted); mitigation.accepted(accepted);
+        verify(execution).report(games.dmg.fantasystick.ability.AbilityReport.Type.PREVENTION,
+            player, new java.math.BigDecimal("2.0"));
+        var cancelled = new EntityDamageByEntityEvent(mock(org.bukkit.entity.Zombie.class), player,
+            EntityDamageEvent.DamageCause.ENTITY_ATTACK, mock(org.bukkit.damage.DamageSource.class), 8);
+        mitigation.reduce(cancelled); cancelled.setCancelled(true); mitigation.accepted(cancelled);
+        verify(execution, times(1)).report(any(), any(), any());
+        verify(weaker, never()).report(any(), any(), any());
+        try { unrelated.close(); } catch (Exception failure) { fail(failure); }
+        stone.close(); mitigation.close();
+    }
+
+    @Test void failedCooldownPersistenceCreatesNoReduction() {
+        var storage = mock(CharacterStorage.class);
+        var sessions = mock(games.dmg.fantasystick.session.EquipmentSessions.class);
+        var parties = new games.dmg.fantasystick.party.PartyRoster(java.time.Clock.systemUTC(), ignored -> true);
+        var registry = new games.dmg.fantasystick.ability.AbilityRegistry();
+        var mitigation = new games.dmg.fantasystick.ability.CombatMitigation();
+        var stone = new games.dmg.fantasystick.ability.StoneSkin(
+            games.dmg.fantasystick.ability.StoneSkin.Settings.defaults(), mitigation); registry.register(stone.definition());
+        var base = new games.dmg.fantasystick.crafting.CharacterFactory().create(
+            games.dmg.fantasystick.progression.ProgressionRules.defaults());
+        var stats = new EnumMap<>(base.stats()); stats.put(Stat.CON, BigInteger.valueOf(14));
+        var record = new CharacterRecord(base.id(), base.name(), base.revision(), stats, base.level(), base.experience(),
+            base.unspentPoints(), base.health(), java.util.Set.of("stone_skin"),
+            List.of("stone_skin", "", "", "", "", "", ""), base.cooldowns(), base.restrictedKills(), false, null, null);
+        var active = new games.dmg.fantasystick.session.EquipmentSessions.Active(java.util.UUID.randomUUID(),
+            java.util.UUID.randomUUID(), record.id());
+        var player = mock(org.bukkit.entity.Player.class); when(player.getUniqueId()).thenReturn(active.player());
+        when(sessions.current(active)).thenReturn(true); when(sessions.currentRecord(active)).thenReturn(java.util.Optional.of(record));
+        var failed = new java.util.concurrent.CompletableFuture<CharacterStorage.AbilityMutation>();
+        failed.completeExceptionally(new java.io.IOException("simulated cooldown save failure"));
+        when(storage.commitAbilityCooldown(eq(record.id()), eq(record.revision()), eq("stone_skin"), any())).thenReturn(failed);
+        var failures = new java.util.ArrayList<games.dmg.fantasystick.ability.AbilityEngine.Failure>();
+        var engine = new games.dmg.fantasystick.ability.AbilityEngine(registry, storage, sessions, parties,
+            java.time.Clock.systemUTC(), Runnable::run, (delay, action) -> () -> {}, ignored -> {}, failures::add);
+        engine.accept(new games.dmg.fantasystick.session.ControlInput(player, active, 2, "stone_skin",
+            games.dmg.fantasystick.session.ControlInput.Kind.ABILITY,
+            games.dmg.fantasystick.session.ControlInput.Gesture.USE, null, 0, 0, () -> true));
+        var hit = new EntityDamageByEntityEvent(mock(org.bukkit.entity.Zombie.class), player,
+            EntityDamageEvent.DamageCause.ENTITY_ATTACK, mock(org.bukkit.damage.DamageSource.class), 8);
+        mitigation.reduce(hit); assertEquals(8, hit.getDamage(), 1.0e-9);
+        verify(storage).commitAbilityCooldown(eq(record.id()), eq(record.revision()), eq("stone_skin"), any());
+        engine.close(); stone.close(); mitigation.close(); parties.close();
+    }
+
+    @Test void configuredDefinitionAdminRoutesAndStartupValidationCoverEverySetting() throws Exception {
+        java.nio.file.Files.writeString(data.resolve("config.yml"),
+            "stone-skin-cooldown-seconds: 2\nstone-skin-duration-seconds: 6\nstone-skin-damage-reduction-percent: 40\n");
+        try (var f = new FantasyStickLifecycleNativeTest.Fixture(data)) {
+            f.plugin.setEnabled(true);
+            var registry = (games.dmg.fantasystick.ability.AbilityRegistry)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "abilityRegistry");
+            var definition = registry.find("stone_skin").orElseThrow();
+            assertEquals(java.time.Duration.ofSeconds(2), definition.cooldown());
+            assertEquals(0, new java.math.BigDecimal("6").compareTo(definition.parameters().get("duration-seconds")));
+            assertEquals(0, new java.math.BigDecimal("40").compareTo(definition.parameters().get("damage-reduction-percent")));
+            var sender = new EquipmentAdminCommandNativeTest.Sender(); sender.allowed = false;
+            assertTrue(f.command.tabComplete(sender.port, "fantasystick", new String[]{"config", "stone-skin"}).isEmpty());
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "stone-skin-duration-seconds", "7"});
+            assertTrue(sender.messages.getLast().contains("Permission denied")); sender.allowed = true;
+            assertEquals(List.of("stone-skin-cooldown-seconds", "stone-skin-damage-reduction-percent", "stone-skin-duration-seconds"),
+                f.command.tabComplete(sender.port, "fantasystick", new String[]{"config", "stone-skin-"}));
+            assertEquals(List.of("4", "6"), f.command.tabComplete(sender.port, "fantasystick",
+                new String[]{"config", "stone-skin-duration-seconds", ""}));
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "stone-skin-duration-seconds"});
+            assertTrue(sender.messages.getLast().contains("=6"));
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "stone-skin-duration-seconds", "7"});
+            var response = f.tasks.poll(5, java.util.concurrent.TimeUnit.SECONDS); assertNotNull(response); response.run();
+            assertEquals(0, new java.math.BigDecimal("7").compareTo(
+                registry.find("stone_skin").orElseThrow().parameters().get("duration-seconds")));
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "stone-skin-duration-seconds", "-1"});
+            assertTrue(sender.messages.getLast().contains("invalid"));
+            f.command.execute(sender.port, "fantasystick", new String[]{"config", "stone-skin-duration-seconds", "7", "extra"});
+            assertTrue(sender.messages.getLast().contains("Usage"));
+            f.plugin.setEnabled(false); f.plugin.setEnabled(true);
+            var reloaded = (games.dmg.fantasystick.ability.AbilityRegistry)
+                FantasyStickLifecycleNativeTest.Fixture.field(f.plugin, "abilityRegistry");
+            assertEquals(0, new java.math.BigDecimal("7").compareTo(
+                reloaded.find("stone_skin").orElseThrow().parameters().get("duration-seconds")));
+        }
+        for (String invalid : List.of("stone-skin-cooldown-seconds: -1\n",
+                "stone-skin-duration-seconds: 0\n", "stone-skin-damage-reduction-percent: 101\n")) {
+            var directory = data.resolve(Integer.toHexString(invalid.hashCode())); java.nio.file.Files.createDirectories(directory);
+            java.nio.file.Files.writeString(directory.resolve("config.yml"), invalid);
+            try (var f = new FantasyStickLifecycleNativeTest.Fixture(directory)) {
+                assertThrows(IllegalArgumentException.class, () -> f.plugin.setEnabled(true)); assertTrue(f.order.isEmpty());
+            }
+        }
+    }
+
+    private static EntityDamageByEntityEvent hit(FantasyStickLifecycleNativeTest.Fixture fixture,
+                                                  FantasyStickLifecycleNativeTest.Actor target, double amount) {
+        var event = new EntityDamageByEntityEvent(mock(org.bukkit.entity.Zombie.class), target.player,
+            EntityDamageEvent.DamageCause.ENTITY_ATTACK, mock(org.bukkit.damage.DamageSource.class), amount);
+        fixture.dispatcher.accept(event); return event;
+    }
+
+    private static void use(FantasyStickLifecycleNativeTest.Fixture fixture,
+                            FantasyStickLifecycleNativeTest.Actor actor) {
+        actor.core.inventory.getInventory().setSelectedSlot(2);
+        fixture.dispatcher.accept(new PlayerInteractEvent(actor.player,
+            org.bukkit.event.block.Action.RIGHT_CLICK_AIR, actor.core.inventory.getItem(2), null,
+            org.bukkit.block.BlockFace.SELF, EquipmentSlot.HAND));
+    }
+
+    private static ClickEvent.Custom abilityButton(FantasyStickLifecycleNativeTest.Actor actor,
+                                                    String label, String ability) {
+        var book = org.bukkit.craftbukkit.inventory.CraftItemStack.asNMSCopy(actor.books.getLast())
+            .get(net.minecraft.core.component.DataComponents.WRITTEN_BOOK_CONTENT);
+        assertNotNull(book);
+        for (var page : book.pages()) {
+            var found = abilityButton(page.raw(), label, ability);
+            if (found != null) return found;
+        }
+        fail("Missing " + label + " for " + ability); return null;
+    }
+    private static ClickEvent.Custom abilityButton(net.minecraft.network.chat.Component component,
+                                                    String label, String ability) {
+        if (component.getString().equals(label)
+                && component.getStyle().getClickEvent() instanceof ClickEvent.Custom custom
+                && custom.payload().orElse(null) instanceof net.minecraft.nbt.StringTag payload
+                && payload.value().contains(":" + ability)) return custom;
+        for (var child : component.getSiblings()) {
+            var found = abilityButton(child, label, ability); if (found != null) return found;
+        }
+        return null;
+    }
+
+    private static void withStoneSkin(Path data, FantasyStickLifecycleNativeTest.Actor actor,
+                                      boolean learned) throws Exception {
+        java.nio.file.Files.createDirectories(data);
+        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.CON, BigInteger.valueOf(14));
+        repository.replace(new CharacterRecord(old.id(), old.name(), old.revision().add(BigInteger.ONE), stats,
+            old.level(), old.experience(), BigInteger.valueOf(learned ? 39 : 40), old.health(),
+            learned ? java.util.Set.of("stone_skin") : old.learned(),
+            learned ? List.of("stone_skin", "", "", "", "", "", "") : old.loadout(),
+            old.cooldowns(), old.restrictedKills(), false, null, null), old.revision());
+    }
+}

src/test/java/games/dmg/fantasystick/DistributionTest.java

@@ -42,6 +42,37 @@ class DistributionTest {
             assertTrue(defaults.contains("character-swap-cooldown-seconds: 900"),
                 "The delivered configuration must expose the reviewed 15-minute default");
             assertTrue(defaults.contains("adventure-mode: true"));
+            assertTrue(defaults.contains("great-sword-base-damage: 7"));
+            assertTrue(defaults.contains("great-sword-recovery-seconds: 1.2"));
+            for (String setting : java.util.List.of("frost-shard-base-damage: 4",
+                    "frost-shard-cooldown-seconds: 5", "frost-shard-range-blocks: 32",
+                    "frost-shard-lifetime-seconds: 5", "frost-shard-projectile-speed-blocks-per-tick: 1",
+                    "frost-shard-slowness-amplifier: 0", "frost-shard-slowness-duration-seconds: 2")) {
+                assertTrue(defaults.contains(setting), "Missing packaged Frost Shard default: " + setting);
+            }
+            for (String setting : java.util.List.of("longbow-base-damage: 5", "longbow-recovery-seconds: 1",
+                    "longbow-minimum-draw-ticks: 3", "longbow-full-draw-ticks: 20",
+                    "longbow-range-blocks: 64", "longbow-lifetime-seconds: 10",
+                    "longbow-full-projectile-speed-blocks-per-tick: 3")) {
+                assertTrue(defaults.contains(setting), "Missing packaged Longbow default: " + setting);
+            }
+            for (String setting : java.util.List.of("quickstep-cooldown-seconds: 5",
+                    "quickstep-distance-blocks: 4", "quickstep-speed-blocks-per-tick: 1")) {
+                assertTrue(defaults.contains(setting), "Missing packaged Quickstep default: " + setting);
+            }
+            for (String setting : java.util.List.of("second-wind-base-healing: 6",
+                    "second-wind-cooldown-seconds: 15")) {
+                assertTrue(defaults.contains(setting), "Missing packaged Second Wind default: " + setting);
+            }
+            for (String setting : java.util.List.of("stone-skin-cooldown-seconds: 14",
+                    "stone-skin-duration-seconds: 4", "stone-skin-damage-reduction-percent: 25")) {
+                assertTrue(defaults.contains(setting), "Missing packaged Stone Skin default: " + setting);
+            }
+            for (String setting : java.util.List.of("shield-bash-base-damage: 4", "shield-bash-cooldown-seconds: 6",
+                    "shield-bash-range-blocks: 3", "shield-bash-horizontal-knockback: 0.8",
+                    "shield-bash-minimum-vertical-knockback: 0.35")) {
+                assertTrue(defaults.contains(setting), "Missing packaged Shield Bash default: " + setting);
+            }
             assertTrue(JavaPlugin.class.isAssignableFrom(FantasyStickPlugin.class));
             var entrypoint = jar.getJarEntry(metadata.getMain().replace('.', '/') + ".class");
             assertNotNull(entrypoint);

src/test/java/games/dmg/fantasystick/persistence/FrostShardSettingsTest.java

@@ -0,0 +1,100 @@
+package games.dmg.fantasystick.persistence;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.StandardCopyOption;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class FrostShardSettingsTest {
+    @TempDir Path data;
+
+    @Test void serializesConcurrentAcceptedKeysWithoutLosingUnrelatedConfiguration() throws Exception {
+        Files.writeString(data.resolve("config.yml"), "adventure-mode: true\nunrelated: retained\n");
+        try (var settings = new FrostShardSettings(data, defaults())) {
+            var damage = settings.set(FrostShardSettings.BASE_DAMAGE, "9").toCompletableFuture();
+            var range = settings.set(FrostShardSettings.RANGE, "40.5").toCompletableFuture();
+            var savedDamage = damage.get(5, TimeUnit.SECONDS);
+            var savedRange = range.get(5, TimeUnit.SECONDS);
+            assertEquals("9", savedDamage.value()); assertEquals("40.5", savedRange.value());
+            assertEquals(new java.math.BigInteger("4"), settings.settings().baseDamage(),
+                "Durability acknowledgment alone must not publish runtime settings");
+            settings.publish(savedRange); settings.publish(savedDamage); // stale callback cannot roll back the newer snapshot.
+            assertEquals(new java.math.BigInteger("9"), settings.settings().baseDamage());
+            assertEquals(40.5, settings.settings().range());
+            var saved = (Map<?, ?>) new org.yaml.snakeyaml.Yaml().load(Files.readString(data.resolve("config.yml")));
+            assertEquals(Boolean.TRUE, saved.get("adventure-mode"));
+            assertEquals("retained", saved.get("unrelated"));
+            assertEquals("9", String.valueOf(saved.get(FrostShardSettings.BASE_DAMAGE)));
+            assertEquals("40.5", String.valueOf(saved.get(FrostShardSettings.RANGE)));
+        }
+    }
+
+    @Test void rejectsMalformedAndOutOfRangeValuesBeforeQueueingOrChangingEffectiveState() {
+        try (var settings = new FrostShardSettings(data, defaults())) {
+            for (var entry : Map.of(
+                    FrostShardSettings.BASE_DAMAGE, "-1",
+                    FrostShardSettings.COOLDOWN, "31536001",
+                    FrostShardSettings.RANGE, "0",
+                    FrostShardSettings.LIFETIME, "0",
+                    FrostShardSettings.SPEED, "Infinity",
+                    FrostShardSettings.AMPLIFIER, "256",
+                    FrostShardSettings.SLOWNESS, "0").entrySet()) {
+                assertThrows(IllegalArgumentException.class, () -> settings.set(entry.getKey(), entry.getValue()));
+            }
+            assertThrows(IllegalArgumentException.class, () -> settings.set(FrostShardSettings.BASE_DAMAGE, "1.5"));
+            assertThrows(IllegalArgumentException.class, () -> settings.set(FrostShardSettings.COOLDOWN, "0.0000000001"));
+            assertEquals("4", settings.value(FrostShardSettings.BASE_DAMAGE));
+            assertFalse(Files.exists(data.resolve("config.yml")));
+        }
+    }
+
+    @Test void failedAtomicReplacementRetainsEffectiveAndFileStateAndAllowsOneExplicitRetry() throws Exception {
+        Files.writeString(data.resolve("config.yml"), "frost-shard-base-damage: 4\n");
+        var fail = new java.util.concurrent.atomic.AtomicBoolean(true);
+        try (var settings = new FrostShardSettings(data, defaults(), (from, to) -> {
+            if (fail.getAndSet(false)) throw new java.io.IOException("simulated replacement failure");
+            Files.move(from, to, StandardCopyOption.REPLACE_EXISTING);
+        })) {
+            assertThrows(java.util.concurrent.ExecutionException.class, () ->
+                settings.set(FrostShardSettings.BASE_DAMAGE, "9").toCompletableFuture().get(5, TimeUnit.SECONDS));
+            assertEquals("4", settings.value(FrostShardSettings.BASE_DAMAGE));
+            assertTrue(Files.readString(data.resolve("config.yml")).contains("4"));
+            var retry = settings.set(FrostShardSettings.BASE_DAMAGE, "9").toCompletableFuture()
+                .get(5, TimeUnit.SECONDS);
+            assertEquals("9", retry.value());
+            assertEquals("4", settings.value(FrostShardSettings.BASE_DAMAGE));
+            settings.publish(retry);
+            assertEquals("9", settings.value(FrostShardSettings.BASE_DAMAGE));
+        }
+    }
+
+    @Test void rejectsUnsafeConfigurationAndLockFilesAndPostCloseWrites() throws Exception {
+        if (!System.getProperty("os.name", "").toLowerCase().contains("win")) {
+            var external = data.resolveSibling(data.getFileName() + "-outside");
+            Files.writeString(external, "safe\n");
+            Files.createSymbolicLink(data.resolve("config.yml"), external);
+            try (var settings = new FrostShardSettings(data, defaults())) {
+                assertThrows(java.util.concurrent.ExecutionException.class, () ->
+                    settings.set(FrostShardSettings.BASE_DAMAGE, "9").toCompletableFuture().get(5, TimeUnit.SECONDS));
+                assertEquals("safe\n", Files.readString(external));
+            }
+            Files.delete(data.resolve("config.yml")); Files.deleteIfExists(external);
+        }
+        var settings = new FrostShardSettings(data, defaults()); settings.close();
+        assertThrows(java.util.concurrent.ExecutionException.class, () ->
+            settings.set(FrostShardSettings.BASE_DAMAGE, "9").toCompletableFuture().get(5, TimeUnit.SECONDS));
+        settings.drained().toCompletableFuture().get(5, TimeUnit.SECONDS);
+    }
+
+    private static Map<String, String> defaults() {
+        var result = new LinkedHashMap<String, String>();
+        for (String key : FrostShardSettings.keys()) result.put(key, FrostShardSettings.defaultValue(key));
+        return result;
+    }
+}

src/test/java/games/dmg/fantasystick/persistence/LongbowSettingsTest.java

@@ -0,0 +1,101 @@
+package games.dmg.fantasystick.persistence;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.StandardCopyOption;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class LongbowSettingsTest {
+    @TempDir Path data;
+
+    @Test void serializesConcurrentAcceptedKeysWithoutLosingUnrelatedConfiguration() throws Exception {
+        Files.writeString(data.resolve("config.yml"), "adventure-mode: true\nunrelated: retained\n");
+        try (var settings = new LongbowSettings(data, defaults())) {
+            var damage = settings.set(LongbowSettings.BASE_DAMAGE, "9").toCompletableFuture();
+            var range = settings.set(LongbowSettings.RANGE, "40.5").toCompletableFuture();
+            var savedDamage = damage.get(5, TimeUnit.SECONDS);
+            var savedRange = range.get(5, TimeUnit.SECONDS);
+            assertEquals("9", savedDamage.value()); assertEquals("40.5", savedRange.value());
+            assertEquals(new java.math.BigInteger("5"), settings.settings().baseDamage(),
+                "Durability acknowledgment alone must not publish runtime settings");
+            settings.publish(savedRange); settings.publish(savedDamage); // stale callback cannot roll back the newer snapshot.
+            assertEquals(new java.math.BigInteger("9"), settings.settings().baseDamage());
+            assertEquals(40.5, settings.settings().range());
+            var saved = (Map<?, ?>) new org.yaml.snakeyaml.Yaml().load(Files.readString(data.resolve("config.yml")));
+            assertEquals(Boolean.TRUE, saved.get("adventure-mode"));
+            assertEquals("retained", saved.get("unrelated"));
+            assertEquals("9", String.valueOf(saved.get(LongbowSettings.BASE_DAMAGE)));
+            assertEquals("40.5", String.valueOf(saved.get(LongbowSettings.RANGE)));
+        }
+    }
+
+    @Test void rejectsMalformedAndOutOfRangeValuesBeforeQueueingOrChangingEffectiveState() {
+        try (var settings = new LongbowSettings(data, defaults())) {
+            for (var entry : Map.of(
+                    LongbowSettings.BASE_DAMAGE, "-1",
+                    LongbowSettings.RECOVERY, "0.999",
+                    LongbowSettings.MINIMUM_DRAW, "0",
+                    LongbowSettings.FULL_DRAW, "2",
+                    LongbowSettings.RANGE, "0",
+                    LongbowSettings.LIFETIME, "0",
+                    LongbowSettings.FULL_SPEED, "Infinity").entrySet()) {
+                assertThrows(IllegalArgumentException.class, () -> settings.set(entry.getKey(), entry.getValue()));
+            }
+            assertThrows(IllegalArgumentException.class, () -> settings.set(LongbowSettings.BASE_DAMAGE, "1.5"));
+            assertThrows(IllegalArgumentException.class, () -> settings.set(LongbowSettings.BASE_DAMAGE, "1" + "0".repeat(309)));
+            assertThrows(IllegalArgumentException.class, () -> settings.set(LongbowSettings.RECOVERY, "1.0000000001"));
+            assertEquals("5", settings.value(LongbowSettings.BASE_DAMAGE));
+            assertFalse(Files.exists(data.resolve("config.yml")));
+        }
+    }
+
+    @Test void failedAtomicReplacementRetainsEffectiveAndFileStateAndAllowsOneExplicitRetry() throws Exception {
+        Files.writeString(data.resolve("config.yml"), "longbow-base-damage: 5\n");
+        var fail = new java.util.concurrent.atomic.AtomicBoolean(true);
+        try (var settings = new LongbowSettings(data, defaults(), (from, to) -> {
+            if (fail.getAndSet(false)) throw new java.io.IOException("simulated replacement failure");
+            Files.move(from, to, StandardCopyOption.REPLACE_EXISTING);
+        })) {
+            assertThrows(java.util.concurrent.ExecutionException.class, () ->
+                settings.set(LongbowSettings.BASE_DAMAGE, "9").toCompletableFuture().get(5, TimeUnit.SECONDS));
+            assertEquals("5", settings.value(LongbowSettings.BASE_DAMAGE));
+            assertTrue(Files.readString(data.resolve("config.yml")).contains("5"));
+            var retry = settings.set(LongbowSettings.BASE_DAMAGE, "9").toCompletableFuture()
+                .get(5, TimeUnit.SECONDS);
+            assertEquals("9", retry.value());
+            assertEquals("5", settings.value(LongbowSettings.BASE_DAMAGE));
+            settings.publish(retry);
+            assertEquals("9", settings.value(LongbowSettings.BASE_DAMAGE));
+        }
+    }
+
+    @Test void rejectsUnsafeConfigurationAndLockFilesAndPostCloseWrites() throws Exception {
+        if (!System.getProperty("os.name", "").toLowerCase().contains("win")) {
+            var external = data.resolveSibling(data.getFileName() + "-outside");
+            Files.writeString(external, "safe\n");
+            Files.createSymbolicLink(data.resolve("config.yml"), external);
+            try (var settings = new LongbowSettings(data, defaults())) {
+                assertThrows(java.util.concurrent.ExecutionException.class, () ->
+                    settings.set(LongbowSettings.BASE_DAMAGE, "9").toCompletableFuture().get(5, TimeUnit.SECONDS));
+                assertEquals("safe\n", Files.readString(external));
+            }
+            Files.delete(data.resolve("config.yml")); Files.deleteIfExists(external);
+        }
+        var settings = new LongbowSettings(data, defaults()); settings.close();
+        assertThrows(java.util.concurrent.ExecutionException.class, () ->
+            settings.set(LongbowSettings.BASE_DAMAGE, "9").toCompletableFuture().get(5, TimeUnit.SECONDS));
+        settings.drained().toCompletableFuture().get(5, TimeUnit.SECONDS);
+    }
+
+    private static Map<String, String> defaults() {
+        var result = new LinkedHashMap<String, String>();
+        for (String key : LongbowSettings.keys()) result.put(key, LongbowSettings.defaultValue(key));
+        return result;
+    }
+}

src/test/java/games/dmg/fantasystick/persistence/QuickstepSettingsTest.java

@@ -0,0 +1,82 @@
+package games.dmg.fantasystick.persistence;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.StandardCopyOption;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class QuickstepSettingsTest {
+    @TempDir Path data;
+
+    @Test void serializesConcurrentKeysPreservesUnrelatedAndPublishesOnlyAcknowledgedSnapshots() throws Exception {
+        Files.writeString(data.resolve("config.yml"), "adventure-mode: true\nunrelated: retained\n");
+        try (var settings = new QuickstepSettings(data, defaults())) {
+            var distance = settings.set(QuickstepSettings.DISTANCE, "6").toCompletableFuture();
+            var speed = settings.set(QuickstepSettings.SPEED, "1.5").toCompletableFuture();
+            var savedDistance = distance.get(5, TimeUnit.SECONDS); var savedSpeed = speed.get(5, TimeUnit.SECONDS);
+            assertEquals(4, settings.settings().distance(), 0);
+            settings.publish(savedSpeed); settings.publish(savedDistance);
+            assertEquals(6, settings.settings().distance(), 0); assertEquals(1.5, settings.settings().speedPerTick(), 0);
+            var saved = (Map<?, ?>) new org.yaml.snakeyaml.Yaml().load(Files.readString(data.resolve("config.yml")));
+            assertEquals(Boolean.TRUE, saved.get("adventure-mode")); assertEquals("retained", saved.get("unrelated"));
+            assertEquals("6", String.valueOf(saved.get(QuickstepSettings.DISTANCE)));
+            assertEquals("1.5", String.valueOf(saved.get(QuickstepSettings.SPEED)));
+        }
+    }
+
+    @Test void rejectsMalformedOrOutOfRangeValuesBeforeQueueing() {
+        try (var settings = new QuickstepSettings(data, defaults())) {
+            for (var entry : Map.of(QuickstepSettings.COOLDOWN, "-1", QuickstepSettings.DISTANCE, "0",
+                    QuickstepSettings.SPEED, "Infinity").entrySet()) {
+                assertThrows(IllegalArgumentException.class, () -> settings.set(entry.getKey(), entry.getValue()));
+            }
+            assertThrows(IllegalArgumentException.class, () -> settings.set(QuickstepSettings.COOLDOWN, "0.0000000001"));
+            assertEquals("4", settings.value(QuickstepSettings.DISTANCE));
+            assertFalse(Files.exists(data.resolve("config.yml")));
+        }
+    }
+
+    @Test void failedReplacementAndUnsafeFilesRetainEffectiveStateAndAllowRetry() throws Exception {
+        Files.writeString(data.resolve("config.yml"), "quickstep-distance-blocks: 4\n");
+        var fail = new java.util.concurrent.atomic.AtomicBoolean(true);
+        try (var settings = new QuickstepSettings(data, defaults(), (from, to) -> {
+            if (fail.getAndSet(false)) throw new java.io.IOException("simulated failure");
+            Files.move(from, to, StandardCopyOption.REPLACE_EXISTING);
+        })) {
+            assertThrows(java.util.concurrent.ExecutionException.class, () ->
+                settings.set(QuickstepSettings.DISTANCE, "6").toCompletableFuture().get(5, TimeUnit.SECONDS));
+            assertEquals("4", settings.value(QuickstepSettings.DISTANCE));
+            var retry = settings.set(QuickstepSettings.DISTANCE, "6").toCompletableFuture().get(5, TimeUnit.SECONDS);
+            assertEquals("4", settings.value(QuickstepSettings.DISTANCE)); settings.publish(retry);
+            assertEquals("6", settings.value(QuickstepSettings.DISTANCE));
+        }
+        if (!System.getProperty("os.name", "").toLowerCase().contains("win")) {
+            var external = data.resolveSibling(data.getFileName() + "-outside"); Files.writeString(external, "safe\n");
+            Files.delete(data.resolve("config.yml")); Files.createSymbolicLink(data.resolve("config.yml"), external);
+            try (var settings = new QuickstepSettings(data, defaults())) {
+                assertThrows(java.util.concurrent.ExecutionException.class, () ->
+                    settings.set(QuickstepSettings.DISTANCE, "7").toCompletableFuture().get(5, TimeUnit.SECONDS));
+                assertEquals("safe\n", Files.readString(external));
+            }
+        }
+    }
+
+    @Test void closeRejectsNewWritesAndCompletesDrain() throws Exception {
+        var settings = new QuickstepSettings(data, defaults()); settings.close();
+        assertThrows(java.util.concurrent.ExecutionException.class, () ->
+            settings.set(QuickstepSettings.DISTANCE, "6").toCompletableFuture().get(5, TimeUnit.SECONDS));
+        settings.drained().toCompletableFuture().get(5, TimeUnit.SECONDS);
+    }
+
+    private static Map<String, String> defaults() {
+        var result = new LinkedHashMap<String, String>();
+        for (String key : QuickstepSettings.keys()) result.put(key, QuickstepSettings.defaultValue(key));
+        return result;
+    }
+}

src/test/java/games/dmg/fantasystick/persistence/SecondWindSettingsTest.java

@@ -0,0 +1,70 @@
+package games.dmg.fantasystick.persistence;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.StandardCopyOption;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.concurrent.TimeUnit;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class SecondWindSettingsTest {
+    @TempDir Path data;
+
+    @Test void serializesConcurrentWritesPreservesUnrelatedAndPublishesAcknowledgedSnapshots() throws Exception {
+        Files.writeString(data.resolve("config.yml"), "unrelated: retained\n");
+        try (var settings = new SecondWindSettings(data, defaults())) {
+            var healing = settings.set(SecondWindSettings.BASE_HEALING, "9").toCompletableFuture();
+            var cooldown = settings.set(SecondWindSettings.COOLDOWN, "20").toCompletableFuture();
+            var h = healing.get(5, TimeUnit.SECONDS); var c = cooldown.get(5, TimeUnit.SECONDS);
+            assertEquals("6", settings.value(SecondWindSettings.BASE_HEALING)); settings.publish(c); settings.publish(h);
+            assertEquals("9", settings.value(SecondWindSettings.BASE_HEALING));
+            assertEquals(java.time.Duration.ofSeconds(20), settings.settings().cooldown());
+            var saved = (Map<?, ?>) new org.yaml.snakeyaml.Yaml().load(Files.readString(data.resolve("config.yml")));
+            assertEquals("retained", saved.get("unrelated")); assertEquals("9", String.valueOf(saved.get(SecondWindSettings.BASE_HEALING)));
+        }
+    }
+
+    @Test void rejectsInvalidValuesAndFailedReplacementRetainsState() throws Exception {
+        try (var settings = new SecondWindSettings(data, defaults())) {
+            assertThrows(IllegalArgumentException.class, () -> settings.set(SecondWindSettings.BASE_HEALING, "-1"));
+            assertThrows(IllegalArgumentException.class, () -> settings.set(SecondWindSettings.BASE_HEALING, "1.5"));
+            assertThrows(IllegalArgumentException.class, () -> settings.set(SecondWindSettings.COOLDOWN, "-1"));
+            assertThrows(IllegalArgumentException.class, () -> settings.set(SecondWindSettings.COOLDOWN, "0.0000000001"));
+        }
+        var fail = new java.util.concurrent.atomic.AtomicBoolean(true);
+        try (var settings = new SecondWindSettings(data, defaults(), (from, to) -> {
+            if (fail.getAndSet(false)) throw new java.io.IOException("simulated");
+            Files.move(from, to, StandardCopyOption.REPLACE_EXISTING);
+        })) {
+            assertThrows(java.util.concurrent.ExecutionException.class, () ->
+                settings.set(SecondWindSettings.BASE_HEALING, "9").toCompletableFuture().get(5, TimeUnit.SECONDS));
+            assertEquals("6", settings.value(SecondWindSettings.BASE_HEALING));
+        }
+    }
+
+    @Test void rejectsUnsafeFileAndPostCloseWrites() throws Exception {
+        if (!System.getProperty("os.name", "").toLowerCase().contains("win")) {
+            var external = data.resolveSibling(data.getFileName() + "-outside"); Files.writeString(external, "safe\n");
+            Files.createSymbolicLink(data.resolve("config.yml"), external);
+            try (var settings = new SecondWindSettings(data, defaults())) {
+                assertThrows(java.util.concurrent.ExecutionException.class, () ->
+                    settings.set(SecondWindSettings.BASE_HEALING, "9").toCompletableFuture().get(5, TimeUnit.SECONDS));
+                assertEquals("safe\n", Files.readString(external));
+            }
+        }
+        var other = data.resolve("closed"); var settings = new SecondWindSettings(other, defaults()); settings.close();
+        assertThrows(java.util.concurrent.ExecutionException.class, () ->
+            settings.set(SecondWindSettings.BASE_HEALING, "9").toCompletableFuture().get(5, TimeUnit.SECONDS));
+        settings.drained().toCompletableFuture().get(5, TimeUnit.SECONDS);
+    }
+
+    private static Map<String, String> defaults() {
+        var result = new LinkedHashMap<String, String>();
+        for (String key : SecondWindSettings.keys()) result.put(key, SecondWindSettings.defaultValue(key));
+        return result;
+    }
+}

src/test/java/games/dmg/fantasystick/persistence/ShieldBashSettingsTest.java

@@ -0,0 +1,57 @@
+package games.dmg.fantasystick.persistence;
+
+import static org.junit.jupiter.api.Assertions.*;
+import java.nio.file.*;
+import java.util.*;
+import java.util.concurrent.TimeUnit;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class ShieldBashSettingsTest {
+    @TempDir Path data;
+    @Test void serializesConcurrentKeysPreservesUnrelatedAndPublishesAcknowledgedSnapshots() throws Exception {
+        Files.writeString(data.resolve("config.yml"), "unrelated: retained\n");
+        try (var settings = new ShieldBashSettings(data, defaults())) {
+            var range = settings.set(ShieldBashSettings.RANGE, "5").toCompletableFuture();
+            var horizontal = settings.set(ShieldBashSettings.HORIZONTAL, "1.2").toCompletableFuture();
+            var r = range.get(5, TimeUnit.SECONDS); var h = horizontal.get(5, TimeUnit.SECONDS);
+            assertEquals(3, settings.settings().range(), 0); settings.publish(h); settings.publish(r);
+            assertEquals(5, settings.settings().range(), 0); assertEquals(1.2, settings.settings().horizontalKnockback(), 0);
+            var saved = (Map<?, ?>) new org.yaml.snakeyaml.Yaml().load(Files.readString(data.resolve("config.yml")));
+            assertEquals("retained", saved.get("unrelated")); assertEquals("5", String.valueOf(saved.get(ShieldBashSettings.RANGE)));
+            assertEquals("1.2", String.valueOf(saved.get(ShieldBashSettings.HORIZONTAL)));
+        }
+    }
+    @Test void rejectsInvalidValuesAndFailedReplacementRetainsState() throws Exception {
+        try (var settings = new ShieldBashSettings(data, defaults())) {
+            for (var entry : Map.of(ShieldBashSettings.BASE_DAMAGE, "-1", ShieldBashSettings.COOLDOWN, "-1",
+                    ShieldBashSettings.RANGE, "0", ShieldBashSettings.HORIZONTAL, "9",
+                    ShieldBashSettings.VERTICAL, "Infinity").entrySet())
+                assertThrows(IllegalArgumentException.class, () -> settings.set(entry.getKey(), entry.getValue()));
+            assertThrows(IllegalArgumentException.class, () -> settings.set(ShieldBashSettings.COOLDOWN, "0.0000000001"));
+            assertThrows(IllegalArgumentException.class, () -> settings.set(ShieldBashSettings.BASE_DAMAGE, "1.5"));
+        }
+        var fail = new java.util.concurrent.atomic.AtomicBoolean(true);
+        try (var settings = new ShieldBashSettings(data, defaults(), (from,to) -> {
+            if (fail.getAndSet(false)) throw new java.io.IOException("simulated"); Files.move(from,to,StandardCopyOption.REPLACE_EXISTING);
+        })) {
+            assertThrows(java.util.concurrent.ExecutionException.class, () ->
+                settings.set(ShieldBashSettings.RANGE, "5").toCompletableFuture().get(5,TimeUnit.SECONDS));
+            assertEquals("3", settings.value(ShieldBashSettings.RANGE));
+        }
+    }
+    @Test void unsafeFileAndClosedStoreFailSafely() throws Exception {
+        if (!System.getProperty("os.name","").toLowerCase().contains("win")) {
+            var external=data.resolveSibling(data.getFileName()+"-outside"); Files.writeString(external,"safe\n");
+            Files.createSymbolicLink(data.resolve("config.yml"),external);
+            try(var settings=new ShieldBashSettings(data,defaults())) {
+                assertThrows(java.util.concurrent.ExecutionException.class,()->settings.set(ShieldBashSettings.RANGE,"5").toCompletableFuture().get(5,TimeUnit.SECONDS));
+                assertEquals("safe\n",Files.readString(external));
+            }
+        }
+        var settings=new ShieldBashSettings(data.resolve("closed"),defaults()); settings.close();
+        assertThrows(java.util.concurrent.ExecutionException.class,()->settings.set(ShieldBashSettings.RANGE,"5").toCompletableFuture().get(5,TimeUnit.SECONDS));
+        settings.drained().toCompletableFuture().get(5,TimeUnit.SECONDS);
+    }
+    private static Map<String,String> defaults(){var result=new LinkedHashMap<String,String>();for(String key:ShieldBashSettings.keys())result.put(key,ShieldBashSettings.defaultValue(key));return result;}
+}

src/test/java/games/dmg/fantasystick/persistence/StoneSkinSettingsTest.java

@@ -0,0 +1,69 @@
+package games.dmg.fantasystick.persistence;
+
+import static org.junit.jupiter.api.Assertions.*;
+import java.nio.file.*;
+import java.util.*;
+import java.util.concurrent.TimeUnit;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class StoneSkinSettingsTest {
+    @TempDir Path data;
+
+    @Test void serializesConcurrentKeysPreservesUnrelatedAndPublishesAcknowledgedSnapshots() throws Exception {
+        Files.writeString(data.resolve("config.yml"), "unrelated: retained\n");
+        try (var settings = new StoneSkinSettings(data, defaults())) {
+            var duration = settings.set(StoneSkinSettings.DURATION, "6").toCompletableFuture();
+            var reduction = settings.set(StoneSkinSettings.REDUCTION, "40").toCompletableFuture();
+            var d = duration.get(5, TimeUnit.SECONDS); var r = reduction.get(5, TimeUnit.SECONDS);
+            assertEquals(java.time.Duration.ofSeconds(4), settings.settings().duration());
+            settings.publish(r); settings.publish(d);
+            assertEquals(java.time.Duration.ofSeconds(6), settings.settings().duration());
+            assertEquals(0, new java.math.BigDecimal("40").compareTo(settings.settings().reductionPercent()));
+            var saved = (Map<?, ?>) new org.yaml.snakeyaml.Yaml().load(Files.readString(data.resolve("config.yml")));
+            assertEquals("retained", saved.get("unrelated"));
+            assertEquals("6", String.valueOf(saved.get(StoneSkinSettings.DURATION)));
+            assertEquals("40", String.valueOf(saved.get(StoneSkinSettings.REDUCTION)));
+        }
+    }
+
+    @Test void rejectsInvalidValuesAndFailedReplacementRetainsState() throws Exception {
+        try (var settings = new StoneSkinSettings(data, defaults())) {
+            for (var entry : Map.of(StoneSkinSettings.COOLDOWN, "-1", StoneSkinSettings.DURATION, "0",
+                    StoneSkinSettings.REDUCTION, "101").entrySet())
+                assertThrows(IllegalArgumentException.class, () -> settings.set(entry.getKey(), entry.getValue()));
+            assertThrows(IllegalArgumentException.class, () -> settings.set(StoneSkinSettings.DURATION, "0.0000000001"));
+        }
+        var fail = new java.util.concurrent.atomic.AtomicBoolean(true);
+        try (var settings = new StoneSkinSettings(data, defaults(), (from, to) -> {
+            if (fail.getAndSet(false)) throw new java.io.IOException("simulated");
+            Files.move(from, to, StandardCopyOption.REPLACE_EXISTING);
+        })) {
+            assertThrows(java.util.concurrent.ExecutionException.class, () ->
+                settings.set(StoneSkinSettings.DURATION, "6").toCompletableFuture().get(5, TimeUnit.SECONDS));
+            assertEquals("4", settings.value(StoneSkinSettings.DURATION));
+        }
+    }
+
+    @Test void unsafeFileAndClosedStoreFailSafely() throws Exception {
+        if (!System.getProperty("os.name", "").toLowerCase().contains("win")) {
+            var external = data.resolveSibling(data.getFileName() + "-outside"); Files.writeString(external, "safe\n");
+            Files.createSymbolicLink(data.resolve("config.yml"), external);
+            try (var settings = new StoneSkinSettings(data, defaults())) {
+                assertThrows(java.util.concurrent.ExecutionException.class, () ->
+                    settings.set(StoneSkinSettings.DURATION, "6").toCompletableFuture().get(5, TimeUnit.SECONDS));
+                assertEquals("safe\n", Files.readString(external));
+            }
+        }
+        var directory = data.resolve("closed"); var settings = new StoneSkinSettings(directory, defaults()); settings.close();
+        assertThrows(java.util.concurrent.ExecutionException.class, () ->
+            settings.set(StoneSkinSettings.DURATION, "6").toCompletableFuture().get(5, TimeUnit.SECONDS));
+        settings.drained().toCompletableFuture().get(5, TimeUnit.SECONDS);
+    }
+
+    private static Map<String,String> defaults() {
+        var result = new LinkedHashMap<String,String>();
+        for (String key : StoneSkinSettings.keys()) result.put(key, StoneSkinSettings.defaultValue(key));
+        return result;
+    }
+}