Rarer than even the elusive weredragon, you are a WEREDUNGEON.
As an Action, you can shapeshift into a 10 ft × 10 ft, 10 in-thick wall with a door. In wall form, you have AC 17, Damage Threshold 8, Speed 0, and your only Action is to return to humanoid form; otherwise, your statistics are unchanged. Behind your door is a trapped custom room of nine contiguous 10-ft cubes. Use the Building a Trap table (DMG p.103) to design a trap of your level or lower. Any humanoid reduced to 0 HP by the trap becomes a new 10-ft cube expansion of you, and for every nine expansions you gain another trap.
If you die, your "expansions" emerge as independent weredungeons.
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