diff --git a/src/common/rpg/components/questLog.ts b/src/common/rpg/components/questLog.ts
index 21faf01..f2f3ae3 100644
--- a/src/common/rpg/components/questLog.ts
+++ b/src/common/rpg/components/questLog.ts
@@ -1,9 +1,9 @@
 import { Component, type EvalContext } from "../core/world";
-import { isQuest, type Quest, type RPGVariables } from "../types";
+import { isQuest, type Quest, type QuestStage, type RPGVariables } from "../types";
 import { evaluateCondition, parseCondition } from "../utils/conditions";
 import { action } from "../utils/decorators";
 
-export type QuestStatus = 'inactive' | 'active' | 'completed';
+export type QuestStatus = 'inactive' | 'active' | 'completed' | 'failed';
 
 export interface QuestRuntimeState {
     status: QuestStatus;
@@ -46,11 +46,57 @@ export class QuestLog extends Component {
         return quest.conditions.every(c => evaluateCondition(parseCondition(c), ctx));
     }
 
+    @action
+    fail(questId: string): boolean {
+        const entry = this.#quests.get(questId);
+        if (!entry || entry.state.status !== 'active') return false;
+        entry.state.status = 'failed';
+        this.emit('failed', { questId });
+        return true;
+    }
+
+    @action
+    abandon(questId: string): boolean {
+        const entry = this.#quests.get(questId);
+        if (!entry || entry.state.status !== 'active') return false;
+        entry.state.status = 'inactive';
+        entry.state.stageIndex = 0;
+        this.emit('abandoned', { questId });
+        return true;
+    }
+
+    getStage(questId: string): QuestStage | undefined {
+        const entry = this.#quests.get(questId);
+        if (!entry || entry.state.status !== 'active') return undefined;
+        return entry.quest.stages[entry.state.stageIndex];
+    }
+
+    getObjectiveProgress(
+        questId: string,
+        ctx: EvalContext,
+    ): Array<{ id: string; description: string; done: boolean }> | undefined {
+        const stage = this.getStage(questId);
+        if (!stage) return undefined;
+        return stage.objectives.map(obj => ({
+            id: obj.id,
+            description: obj.description,
+            done: evaluateCondition(parseCondition(obj.condition), ctx),
+        }));
+    }
+
     /** @internal used by QuestSystem */
     entries(): IterableIterator<[string, QuestEntry]> {
         return this.#quests.entries();
     }
 
+    /** @internal called by QuestSystem when a fail condition is met */
+    _fail(questId: string): void {
+        const entry = this.#quests.get(questId);
+        if (!entry) return;
+        entry.state.status = 'failed';
+        this.emit('failed', { questId });
+    }
+
     /** @internal called by QuestSystem after stage actions complete */
     _advance(questId: string): void {
         const entry = this.#quests.get(questId);
diff --git a/src/common/rpg/core/world.ts b/src/common/rpg/core/world.ts
index ec69727..374ba92 100644
--- a/src/common/rpg/core/world.ts
+++ b/src/common/rpg/core/world.ts
@@ -1,8 +1,18 @@
 import { ACTION_KEYS, VARIABLE_KEYS } from '../utils/decorators';
 import type { RPGActions, RPGVariables } from '../types';
 
+interface EntityEvent<T = unknown> {
+    target: Entity;
+    data?: T;
+}
+interface WorldEvent<T = unknown> {
+    target: World;
+    data?: T;
+}
+
 type Class<T> = abstract new (...args: any[]) => T;
-type EventHandler = (data: unknown) => void;
+type EntityEventHandler = <T>(event: EntityEvent<T>) => void;
+type WorldEventHandler = <T>(event: WorldEvent<T>) => void;
 
 export interface EvalContext {
     self: Entity;
@@ -17,8 +27,8 @@ export abstract class Component {
         this.entity.emit(`${this.key}.${event}`, data);
     }
 
-    onAdd(): void {}
-    onRemove(): void {}
+    onAdd(): void { }
+    onRemove(): void { }
 
     getVariables(): RPGVariables {
         const meta = (this.constructor as Function)[Symbol.metadata];
@@ -50,8 +60,8 @@ export abstract class Component {
 }
 
 export abstract class System {
-    onAdd(_world: World): void {}
-    onRemove(_world: World): void {}
+    onAdd(_world: World): void { }
+    onRemove(_world: World): void { }
     abstract update(world: World, dt: number): void;
 }
 
@@ -61,7 +71,7 @@ export class Entity {
     constructor(
         readonly id: string,
         private readonly world: World,
-    ) {}
+    ) { }
 
     add<T extends Component>(key: string, component: T): T {
         const existing = this.#components.get(key);
@@ -132,15 +142,15 @@ export class Entity {
         this.world.emitGlobal(event, data);
     }
 
-    on(event: string, handler: EventHandler): () => void {
+    on(event: string, handler: EntityEventHandler): () => void {
         return this.world.on(this.id, event, handler);
     }
 
-    off(event: string, handler: EventHandler): void {
+    off(event: string, handler: EntityEventHandler): void {
         this.world.off(this.id, event, handler);
     }
 
-    once(event: string, handler: EventHandler): () => void {
+    once(event: string, handler: EntityEventHandler): () => void {
         return this.world.once(this.id, event, handler);
     }
 
@@ -165,8 +175,8 @@ export class World {
     readonly globals: RPGVariables = {};
 
     readonly #entities = new Map<string, Entity>();
-    readonly #handlers = new Map<string, Set<EventHandler>>();
-    readonly #globalHandlers = new Map<string, Set<EventHandler>>();
+    readonly #handlers = new Map<string, Set<EntityEventHandler>>();
+    readonly #globalHandlers = new Map<string, Set<WorldEventHandler>>();
     readonly #systems: System[] = [];
     #entityCounter = 0;
 
@@ -205,33 +215,42 @@ export class World {
 
     removeSystem(system: System): void {
         const idx = this.#systems.indexOf(system);
-        if (idx !== -1) { this.#systems.splice(idx, 1); system.onRemove(this); }
+        if (idx !== -1) {
+            this.#systems.splice(idx, 1);
+            system.onRemove(this);
+        }
     }
 
-    tick(dt: number): void {
+    update(dt: number): void {
         for (const system of this.#systems) system.update(this, dt);
     }
 
     emit(entityId: string, event: string, data?: unknown): void {
-        this.#handlers.get(`${entityId}\0${event}`)?.forEach(h => h(data));
+        const entity = this.getEntity(entityId);
+        if (!entity) return;
+
+        this.#handlers.get(`${entityId}\0${event}`)?.forEach(h => h({
+            target: entity,
+            data,
+        }));
     }
 
     emitGlobal(event: string, data?: unknown): void {
-        this.#globalHandlers.get(event)?.forEach(h => h(data));
+        this.#globalHandlers.get(event)?.forEach(h => h({ target: this, data }));
     }
 
-    on(event: string, handler: EventHandler): () => void;
-    on(entityId: string, event: string, handler: EventHandler): () => void;
-    on(arg1: string, arg2: EventHandler | string, arg3?: EventHandler): () => void {
+    on(event: string, handler: WorldEventHandler): () => void;
+    on(entityId: string, event: string, handler: EntityEventHandler): () => void;
+    on(arg1: string, arg2: WorldEventHandler | string, arg3?: EntityEventHandler): () => void {
         if (typeof arg2 === 'string') {
             return this.#addHandler(this.#handlers, `${arg1}\0${arg2}`, arg3!);
         }
         return this.#addHandler(this.#globalHandlers, arg1, arg2);
     }
 
-    off(event: string, handler: EventHandler): void;
-    off(entityId: string, event: string, handler: EventHandler): void;
-    off(arg1: string, arg2: EventHandler | string, arg3?: EventHandler): void {
+    off(event: string, handler: WorldEventHandler): void;
+    off(entityId: string, event: string, handler: EntityEventHandler): void;
+    off(arg1: string, arg2: WorldEventHandler | string, arg3?: EntityEventHandler): void {
         if (typeof arg2 === 'string') {
             this.#handlers.get(`${arg1}\0${arg2}`)?.delete(arg3!);
         } else {
@@ -239,21 +258,21 @@ export class World {
         }
     }
 
-    once(event: string, handler: EventHandler): () => void;
-    once(entityId: string, event: string, handler: EventHandler): () => void;
-    once(arg1: string, arg2: EventHandler | string, arg3?: EventHandler): () => void {
+    once(event: string, handler: WorldEventHandler): () => void;
+    once(entityId: string, event: string, handler: EntityEventHandler): () => void;
+    once(arg1: string, arg2: WorldEventHandler | string, arg3?: EntityEventHandler): () => void {
         if (typeof arg2 === 'string') {
-            const wrapped: EventHandler = data => { unsub(); arg3!(data); };
+            const wrapped: EntityEventHandler = data => { unsub(); arg3!(data); };
             const unsub = this.on(arg1, arg2, wrapped);
             return unsub;
         }
         const h = arg2;
-        const wrapped: EventHandler = data => { unsub(); h(data); };
+        const wrapped: WorldEventHandler = data => { unsub(); h(data); };
         const unsub = this.on(arg1, wrapped);
         return unsub;
     }
 
-    #addHandler(map: Map<string, Set<EventHandler>>, key: string, handler: EventHandler): () => void {
+    #addHandler<T extends WorldEventHandler | EntityEventHandler>(map: Map<string, Set<T>>, key: string, handler: T): () => void {
         if (!map.has(key)) map.set(key, new Set());
         map.get(key)!.add(handler);
         return () => map.get(key)?.delete(handler);
diff --git a/src/common/rpg/dialog.ts b/src/common/rpg/dialog.ts
index c83df93..4a1d97e 100644
--- a/src/common/rpg/dialog.ts
+++ b/src/common/rpg/dialog.ts
@@ -243,8 +243,15 @@ export class DialogEngine {
 
     async advance(nodeId?: string): Promise<DialogNodeView | null> {
         let targetId = nodeId ?? this.currentNode?.nextNodeId ?? (this.currentNode === null ? this.startNodeId : undefined);
+        const visited = new Set<string>();
 
         while (targetId !== undefined) {
+            if (visited.has(targetId)) {
+                console.warn(`[DialogEngine] cycle detected at node '${targetId}', stopping`);
+                return null;
+            }
+            visited.add(targetId);
+
             const node = this.nodeMap.get(targetId);
             if (!node) return null;
 
diff --git a/src/common/rpg/systems/questSystem.ts b/src/common/rpg/systems/questSystem.ts
index 004a362..6892c7a 100644
--- a/src/common/rpg/systems/questSystem.ts
+++ b/src/common/rpg/systems/questSystem.ts
@@ -24,7 +24,20 @@ export class QuestSystem extends System {
             if (state.status !== 'active') continue;
 
             const stage = quest.stages[state.stageIndex];
-            if (!stage) continue;
+            if (!stage) {
+                console.warn(`[QuestSystem] quest '${questId}' is active but has no stage at index ${state.stageIndex}`);
+                continue;
+            }
+
+            if (stage.failConditions?.length) {
+                const failed = stage.failConditions.some(c =>
+                    evaluateCondition(parseCondition(c), ctx)
+                );
+                if (failed) {
+                    questLog._fail(questId);
+                    continue;
+                }
+            }
 
             const allDone = stage.objectives.every(obj =>
                 evaluateCondition(parseCondition(obj.condition), ctx)
diff --git a/src/common/rpg/types.ts b/src/common/rpg/types.ts
index b428eaa..ca150f1 100644
--- a/src/common/rpg/types.ts
+++ b/src/common/rpg/types.ts
@@ -55,6 +55,7 @@ const QuestStageScheme = Type.Object({
     description: Type.String(),
     objectives: Type.Array(QuestObjectiveScheme),
     actions: Type.Array(RPGActionScheme),
+    failConditions: Type.Optional(Type.Array(Type.String())),
 });
 
 const QuestScheme = Type.Object({
diff --git a/src/common/rpg/utils/variables.ts b/src/common/rpg/utils/variables.ts
index f54a5d7..1417d98 100644
--- a/src/common/rpg/utils/variables.ts
+++ b/src/common/rpg/utils/variables.ts
@@ -29,7 +29,10 @@ export function resolveVariable(name: string, ctx: EvalContext): RPGVariables[st
         const entityId = name.slice(1, dotIdx);
         const varName = name.slice(dotIdx + 1);
         const entity = ctx.world.getEntity(entityId);
-        if (!entity) return undefined;
+        if (!entity) {
+            console.warn(`[resolveVariable] entity '${entityId}' not found (referenced in '${name}')`);
+            return undefined;
+        }
         return resolveVariables(entity)[varName];
     }
     // bare name → self entity
@@ -53,14 +56,24 @@ export async function executeAction(action: RPGAction, ctx: EvalContext): Promis
     // @entityId.component.action → dispatch to another entity
     if (action.type.startsWith('@')) {
         const dotIdx = action.type.indexOf('.', 1);
-        if (dotIdx === -1) return;
+        if (dotIdx === -1) {
+            console.warn(`[executeAction] malformed cross-entity action '${action.type}': missing '.' after entity id`);
+            return;
+        }
         const entityId = action.type.slice(1, dotIdx);
         const found = ctx.world.getEntity(entityId);
-        if (!found) return;
+        if (!found) {
+            console.warn(`[executeAction] entity '${entityId}' not found (action '${action.type}')`);
+            return;
+        }
         entity = found;
         actionType = action.type.slice(dotIdx + 1);
     }
 
     const actions = resolveActions(entity);
-    return actions[actionType]?.(action.arg);
+    if (!(actionType in actions)) {
+        console.warn(`[executeAction] action '${actionType}' not found on entity '${entity.id}'`);
+        return;
+    }
+    return actions[actionType](action.arg);
 }