From Pathfinder #215: To Blot Out the Sun, which isn't enabled.

Acid Mist

COMPLEX HAZARD 6

Stealth +10 (trained)

Description A golden guardrail sprays magical, flesh-eating acid throughout the stairwell.

Disable DC 26 Thievery (expert) to deactivate the trap's sensors, or DC 24 Arcana (expert) to disrupt the guardrail's magic, or Dispel Magic (3rd rank; counteract DC 24) to counteract the guardrail

AC 21; Fort +17, Ref +11

Hardness 13, HP 56 (BT 28); Immunities critical hits, precision

Spray Acid (acid, arcane)

Trigger A creature steps on the south stairs

Effect The guardrail sprays flesh-eating acid, filling the entire stairwell. All living creatures on the stairs area take 2d8+9 acid damage (DC 27 basic Reflex save). The trap then rolls initiative.

Routine (1 action) On its initiative, the trap continues to spray acid, dealing 2d8+9 acid damage to all living creatures on the stairs (DC 25 basic Reflex save).

Reset The trap automatically deactivates after 1 minute. It resets in 1 hour.

Pathfinder #215: To Blot Out the SunORC