diff --git a/Semesterprojekt/docs/enhancement-ideas.md b/Semesterprojekt/docs/enhancement-ideas.md
index f004757..f48c541 100644
--- a/Semesterprojekt/docs/enhancement-ideas.md
+++ b/Semesterprojekt/docs/enhancement-ideas.md
@@ -78,6 +78,14 @@ Farb-Rollen: Items / NPCs / Exits / Heading / Gefahr.
 
 ### 5. Quest-System (NPC-Ausbau)
 
+> ✅ Fundament umgesetzt (Branch `feature/quest-foundation`): World-Flags +
+> Condition/Effect-Engine, verschlossene Exits, zustandsabhängige Beschreibungen,
+> bedingte Dialoge, Reaktionen mit requires/effects, Schalter-Effekte. Demo:
+> Generator schaltet Strom → Keller-Tür öffnet + Raum wird beleuchtet. Quest-
+> Objekte/Log (#3.2) und Enden (#3.3) sowie Licht/Dunkelheit & Item-Kombination
+> stehen noch aus.
+
+
 - Aktuelles NPC-System: Begrüßung + Geschenk-Reaktion (Item → Item).
 - Ausbau Richtung: mehrstufige Quests, Bedingungen, NPC-"Memory" (Zustand),
   Quest-Log, evtl. Win-Condition daran gekoppelt.
diff --git a/Semesterprojekt/src/main/resources/world/items.yaml b/Semesterprojekt/src/main/resources/world/items.yaml
index 06d0650..70a52d5 100644
--- a/Semesterprojekt/src/main/resources/world/items.yaml
+++ b/Semesterprojekt/src/main/resources/world/items.yaml
@@ -22,3 +22,15 @@
   id: key
   name: Brass Key
   description: A small brass key, polished from use.
+
+- type: switchable
+  id: generator
+  name: Generator
+  description: A rusty generator with a heavy lever.
+  initialState: false
+  onText: |
+    You heave the lever. Somewhere deep in the manor, the lights flicker on.
+  offText: |
+    You pull the lever back; the manor falls dark again.
+  effects:
+    - { setFlag: power_on }
diff --git a/Semesterprojekt/src/main/resources/world/npcs.yaml b/Semesterprojekt/src/main/resources/world/npcs.yaml
index 5d9b04c..2abdb34 100644
--- a/Semesterprojekt/src/main/resources/world/npcs.yaml
+++ b/Semesterprojekt/src/main/resources/world/npcs.yaml
@@ -10,3 +10,8 @@
         "Thank you! Here, take this key."
       gives: key
       consumes: lamp
+  dialogue:
+    - when: [{ flag: power_on }]
+      text: |
+        "You got the power running! The whole house feels less...
+        watchful now."
diff --git a/Semesterprojekt/src/main/resources/world/rooms.yaml b/Semesterprojekt/src/main/resources/world/rooms.yaml
index 4521903..2ce13cb 100644
--- a/Semesterprojekt/src/main/resources/world/rooms.yaml
+++ b/Semesterprojekt/src/main/resources/world/rooms.yaml
@@ -9,6 +9,11 @@
     south: dungeon
   items: [letter, lamp]
   npcs: [old_man]
+  exitLocks:
+    - direction: east
+      requires: [{ flag: power_on }]
+      blocked: |
+        The cellar door is held shut by a magnetic lock — dead without power.
 
 - id: hallway
   name: Dark Hallway
@@ -40,12 +45,17 @@
     west: kitchen
   items: []
   npcs: []
+  descriptionStates:
+    - when: [{ flag: power_on }]
+      text: |
+        With the power back, a bare bulb buzzes overhead, revealing
+        shelves of dusty jars along the far wall.
 
 - id: dungeon
   name: Dungeon
   description: |
-    A dark, damp room.
+    A dark, damp room. A rusty generator squats in the corner.
   exits:
     north: kitchen
-  items: []
+  items: [generator]
   npcs: []