Wildfire

Routine (1+ hour) An unsheltered character must succeed at a DC 21 Reflex save or take 6d6 fire damage (12d6 fire damage on a critical failure). If the character has sheltered in a temporary shelter or a flammable building, attempt a DC 16 flat check each hour the fire persists; on a failure, the fire consumes the shelter.

Severe Wildfire (10th) A severe wildfire has a duration of 8+ hours. Unsheltered characters must succeed at a DC 29 Reflex save or take 12d6 fire damage (24d6 fire damage on a critical failure), and it's a DC 11 flat check for the temporary or flammable shelter to avoid burning. The heavy smoke in the area is thick enough to function as fog.