Doorless Jailor

A faceless turnkey of a prison that has no doors at all, until it decides someone belongs inside. It says nothing, simply turning an iron key in the empty air toward whoever it has chosen to keep. The moment it judges you a prisoner the room becomes your cell: exits seal, and your own feet root to the floor where it left you.

Iron Key Strike: bludgeoning, melee, +5 to hit, 2d8+4. Lock the Moment: 30 ft, save Wis Mind or the target cannot move from its space for 1 round, cooldown 3 rounds.

No Exit: once per encounter, when reduced below half hp, it may seal one passage, portal, or escape route for 1d4 rounds. Resists nonmagical weapons. Senses: Night Vision (60 ft).