---

publish: true
aliases:

• Brown Mold
  created: 2026-03-09T12:15:33.775-04:00
  modified: 2026-03-09T12:15:33.775-04:00
  published: 2026-03-09T12:15:33.775-04:00
  tags:
• ttrpg-cli/compendium/src/5e/dmg
  cssclasses:
• json5e-hazard
  obsidianUIMode: preview

---

Brown Mold

Generic 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.

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.

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). A patch of brown mold exposed to an effect that deals cold damage is instantly destroyed.

Sources

Dungeon Master’s Guide p. 105