From Pathfinder Adventure Path: Gatewalkers, which isn't enabled.

Corpse Disposal

HAZARD 2

Stealth +11 (or 0 if the trapdoor is disabled or broken)

Description A wooden trapdoor conceals a spike-filled pit 10 feet square and 20 feet deep. The DC to Climb out of the pit is DC 10 Athletics.

Disable DC 18 Thievery (trained) to jam the trapdoor open

AC 18; Fort +7, Ref +7

Hardness 9, HP 30 (BT 15); Immunities critical hits, precision

Dispose

Trigger A creature steps onto the trapdoor (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 from the fall) and takes 3d6 piercing 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

Pathfinder Adventure Path: GatewalkersORC