The Codex records every unique item and enemy your guild has discovered. Each dungeon has its own item Codex tracking what percentage of that dungeon's drops you've found. There is also a global discovery tracker across all dungeons.
Dungeon Codex Milestones
Completing milestones within a dungeon's item pool unlocks permanent bonuses for all future runs in that dungeon:
30% completion — Unlocks Auto-Run for that dungeon (parties re-dispatch automatically)
50% completion — +10% rarity bonus on all drops in that dungeon
70% completion — +10% gold multiplier on all runs in that dungeon
100% completion — Unlocks a permanent Title for all heroes (unique per dungeon). Also unlocks the associated Raid if one exists.
Global Codex Milestones — World Drop Bonus
As total discovery grows across all dungeons, two global milestones — at 50% and 100% total discovery — each grant a permanent +10% global gold and XP bonus applied to every run.
Tips
Prioritise boss-exclusive drops early — they have the highest impact and lowest drop rates
Equip rarityBonus gear to accelerate discovery of higher-rarity items
Some items only drop from rare elite enemies — you must encounter those to discover their exclusives