Dungeon Keeper

The Dungeon Keeper is an unused NPC

Behavior
Dungeon Keepers are immortal and cannot be killed by normal means.

Like most other structure-related NPCs, Dungeon Keepers will not despawn naturally unless they are outside of their natural dimension.

Trades
Dungeon Keeper trades are always fully available by default, and don't require any additional trades to unlock more.

地牢守门人