From Pathfinder #159: All or Nothing, which isn't enabled.

Acidic Poison Cloud Trap

COMPLEX HAZARD 13

Stealth +30 (master)

Description Five nozzles hidden across the apartment's ceiling spew thick clouds of acidic poison from a reinforced tank behind the wall.

Disable DC 35 Thievery (expert) to block one of the nozzles or DC 40 Thievery (master) to shut off the tank. The trap deactivates after 5 rounds, once the tank is empty.

AC 34; Fort +28, Ref +20

Hardness 15, HP 40 (BT 20) to destroy a nozzle; Tank Hardness 20; TankHP 100 (BT 50) to damage the tank enough to stop it from spewing gas; Immunities precision, critical hits

Spew Cloud

Trigger Twelve seconds have passed since the door to the apartment was opened

Effect The trap rolls initiative.

Routine (1 action) When it's triggered, the trap has five active nozzles, but at the end of its turn each round, one random nozzle deactivates. On the trap's turn, the active nozzles emit a cloud of acidic poison gas that expands to fill the apartment. The cloud deals 1d6 acid plus 1d6 poison damage per active nozzle to each creature and object in the room (DC 33 basic Fortitude save). Unattended objects automatically fail saves to avoid the damage.

Pathfinder #159: All or NothingOGL