diff --git a/worklog.md b/worklog.md
index 4c3ce53..346c721 100755
--- a/worklog.md
+++ b/worklog.md
@@ -307,3 +307,49 @@ Stage Summary:
 - combo field now properly initialized in game state
 - Persist function now saves both combo and attunements
 - Build should now pass prerendering stage
+
+---
+Task ID: 13
+Agent: Main
+Task: Fix prerender error - Cannot read properties of undefined (reading 'materials')
+
+Work Log:
+- Identified the issue: LootInventory type was referenced but never defined
+- The `lootInventory` property was also missing from GameState interface and initial state
+- Added LootInventory interface to types.ts with:
+  - materials: Record<string, number> (materialId -> count)
+  - blueprints: string[] (blueprint IDs discovered)
+- Added `lootInventory: LootInventory` field to GameState interface
+- Added default lootInventory to makeInitial() in store.ts
+- Added lootInventory to persist partialize function
+
+Stage Summary:
+- LootInventory type properly defined and used
+- lootInventory field now properly initialized in game state
+- Persist function now saves loot inventory
+
+---
+Task ID: 14
+Agent: Main
+Task: Fix prerender error - Add missing AchievementState and stats tracking
+
+Work Log:
+- Identified multiple missing types and fields referenced in page.tsx
+- Added AchievementDef interface to types.ts with:
+  - id, name, desc, category, requirement, reward, hidden
+- Added AchievementState interface with:
+  - unlocked: string[] (IDs of unlocked achievements)
+  - progress: Record<string, number> (progress toward requirements)
+- Added to GameState:
+  - achievements: AchievementState
+  - totalSpellsCast: number
+  - totalDamageDealt: number
+  - totalCraftsCompleted: number
+- Added default values to makeInitial() in store.ts
+- Added all new fields to persist partialize function
+
+Stage Summary:
+- All missing types and fields now properly defined
+- Achievement system can track unlocked achievements and progress
+- Stats tracking for spells cast, damage dealt, and crafts completed
+- Build should now pass without undefined property errors