pf2e.fyi
From Pathfinder Society Quest #24: Tanuki Trouble, which isn't enabled.

Burning Building

HAZARD 0
ELEMENTALFIRE
Stealth -10
Description Non-living flames burn hungrily.
Disable DC 19 Survival to beat the flames with a stage curtain or similar cloth, DC 14 Acrobatics to splash liquids onto the fire, or 5 points of cold damage.
Conflagration
Trigger A creature starts its turn in a burning building
Effect The creature must attempt a DC 18 Reflex save or take 1d6 fire damage
Spread
Trigger The round ends and no creature has attempted to Disable it this round
Effect A building within 15 feet becomes a burning building. The burning building can't use Spread next round.
Pathfinder Society Quest #24: Tanuki TroubleOGL