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There is a Legacy version here.

Corpse DisposalHazard 2

Mechanical Trap 
Source Gatewalkers (Hardcover) pg. 40
Complexity Simple
Stealth DC 21 (or 0 if the trap door is disabled or broken)
Description A wooden trap door conceals a spike-filled pit 10 feet square and 20 feet deep. The DC to Climb out of the pit is 10.
Disable DC 18 Thievery (trained) to jam the trap door open
AC 18, Fort +7, Ref +7
Trap door Hardness 9, Trap door HP 30; Immunities critical hits, object immunities, precision damage
Dispose [reaction] Trigger A creature steps onto the trap door (marked “T” on the map); Effect The triggering creature falls into the pit. The creature can use the Grab an Edge reaction to avoid falling. Failing that, the creature falls 20 feet (taking 10 bludgeoning damage from the fall) and takes 3d6 piercing damage from the metal spikes jutting up from the pit’s floor. A creature who takes damage from the spikes is exposed to tetanus.
Tetanus (disease) Saving Throw DC 14 Fortitude; Onset 10 days; Stage 1 clumsy 1 (1 week); Stage 2 clumsy 2 and can’t speak (1 day); Stage 3 paralyzed with spasms (1 day); Stage 4 death