Dungeon Hazard. Brown mold feeds on warmth, drawing heat from anything around it. A patch of brown mold typically covers a 10-foot square, and the temperature within 30 feet of it is always frigid.
Brown Mold Vulnerability. A patch of brown mold exposed to an effect that deals cold damage is instantly destroyed.
Aura of Cold. Brown mold constantly consumes ambient heat. When a creature moves to within 5 feet of the mold for the first time on a turn or starts its turn there, it must make a DC 12 Constitution saving throw, taking 22 (4d10) cold damage on a failed save, or half as much damage on a successful one.
Consume Fire. Brown mold is immune to fire, and any source of fire brought within 5 feet of a patch causes it to instantly expand outward in the direction of the fire, covering a 10-foot-square area (with the source of the fire at the center of that area).
Hazard. The brown mold can take no actions. Its Consume Fire trait activates instantaneously and does not require an action or reaction.
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