A Treasury with three locked chests may appear after you defeat a monster. You can open one of the chests for free and the other two using keys. The more chests you open, the more rewards you get!
You may receive the following in monster Treasuries:
- energy and coins,
- items from rare collections,
- artifact assemblers and rare assemblers,
- items for entering locations,
- keys to caches on the map,
- items for summoning and dispelling anomalies.
Chests in the treasuries of Psy-werewolves, Scaly Gargoyles, Adepts, Diggers, Fire Mummies, and especially Flame Gargoyles, Iron Gargoyles, and Moon Werewolves are more expensive but contain more valuable rewards.
You can find especially valuable event rewards in the chests of event monsters: Zombies, Spirits of Falling Leaves, Ice Golems, the Kitsune, and the Forest Echo.