Weird doors in dungeons are fun.
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A large stone disk, well balanced on a central axis, spins within a round cutout. Alcoves cut into the disk allow a person to move with the disk and transit between rooms.
- The disk only spins one way.
- Each alcove only accommodates one person.
- A full revolution will take about a minute. The stone is heavy.
Why this is great:
- It's an easily solved obstacle, with many possible variations
- The door prevents rapid retreat of adventuring groups, prompting hard choices
A few nifty alternatives:
