What is a must for an evil overlord’s keep?

What is a must for an evil overlord’s keep?

What is a must for an evil overlord’s keep? Is it a rolling boulder trap? Booby trapped ventilation system? A trash compactor room (incl. a silly looking monster)?

Share your thoughts at /r/DungeonWorld and win a copy of The Perilous Wilds.

https://www.reddit.com/r/DungeonWorld/comments/55z6rz/creative_thread_9_dungeon_refurbishment/