From Pathfinder #157: Devil at the Dreaming Palace, which isn't enabled.

Explosive Barrels

HAZARD 2

Stealth +5

Description Wooden barrels marked with an oil-drop symbol catch fire and explode.

Disable DC 20 Survival to smother the flames without rupturing the barrels

AC 15; Fort +11, Ref +3

Hardness 1, HP 5 (BT 2); Immunities precision

Explode

Trigger 4 rounds pass after the agents' arrival without anyone smothering them

Effect The barrels explode, dealing 3d6+8 fire damage to everything within a 20-foot radius (DC 20 basic Reflex save).

Pathfinder #157: Devil at the Dreaming PalaceOGL