From Pathfinder #210: Whispers in the Dirt, which isn't enabled.

Sewer Pipe Trap

HAZARD 10

Stealth +22 (expert)

Description Pressure-sensitive panels in the floor connects to a metal plate holding a number of sewer pipes shut in the ceiling.

Disable DC 32 Thievery (expert) on the floor panels before the plate falls away

AC 27; Fort +22, Ref +16

Hardness 18, HP 70 (BT 35); Immunities critical hits, precision

Filth Fall

Trigger Pressure is placed on the floor tiles

Effect The metal plate above gives way, unleashing a torrent of sewage and flesh-eating worms on everyone within 10 feet of the pressure plate. Anyone hit by the filth must attempt a DC 32 Fortitude save.

Critical Success The creature is unaffected.

Success The creature becomes Sickened 1 and takes 2d12 piercing damage.

Failure The creature is Sickened 2 and takes 4d12 piercing damage.

Critical Failure The creature is Sickened 4 and takes 4d12 piercing damage plus 2d12 persistent piercing damage.

Pathfinder #210: Whispers in the DirtORC