From Pathfinder #165: Eyes of Empty Death, which isn't enabled.

Daemonic Fog

HAZARD 10

Stealth +20 DC 30 Perception (expert)

Description The fog solidifies into tiny, gnawing creatures that devour everyone within before fading back into mist.

Disable DC 28 Survival (expert) to disrupt the fog before the hazard triggers or Dispel Magic (5th rank; counteract DC 26) to counteract the magic.

Gnawing Fog (divine)

Trigger A creature crosses the cavern's midpoint (the dotted line on the map)

Effect The hazard deals 9d6 piercing damage (DC 32 basic Reflex save) to the triggering creature and all other non-fiend creatures within 20 feet. A creature that critically fails the saving throw is Confused for 1d4 rounds.

Reset The hazard resets over the course of an hour as the daemonic stain reenergizes the fog.

Pathfinder #165: Eyes of Empty DeathOGL