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

Formian Sting Trench

HAZARD 4

Stealth +0 (trained)

Description A thin layer of canvas conceals this 10-foot-square pit, the walls of which are studded with dagger-sized formian stingers. Creatures that fall into the trap risk being gouged by the poisonous barbs.

Disable DC 22 Thievery (trained)

AC 18; Fort +8, Ref +8

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

Entrench (attack)

Trigger A creature walks onto the canvas

Effect The creature falls into the Concealed trench and takes falling damage (typically 10 bludgeoning). The creature is also gouged by three poisoned stingers as they fall. The creature can use the Grab an Edge reaction to avoid falling.

Formian Trench Poison (poison)

Saving Throw DC 21 Fortitude

Maximum Duration 6 rounds

Stage 1 1d6 poison (1 round)

Stage 2 1d6 poison and Clumsy 1 (1 round)

Stage 3 1d6 poison, clumsy 1, and Enfeebled 1 (1 round)

Stage 4 2d6 poison, clumsy 1, and enfeebled 1 (1 round)

Melee Stinger +17, Damage 1d8+3 piercing plus Formian Trench Poison

Reset Creatures can still fall into the trap, but the canvas must be reset manually for the trap to become hidden again.

Pathfinder Adventure Path: GatewalkersORC