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Brown Mold

HazardXDMGp. 762024

Brown mold resembles a furry, light-brown carpet. This fungus feeds on warmth, drawing heat from anything around itself. One patch of brown mold covers a 10-foot square, and the temperature within 30 feet of it is always frigid.

When a creature enters a space within 5 feet of the mold for the first time on a turn or starts its turn there, the creature makes 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 has Immunity to Fire damage, and any source of fire brought within 5 feet of it causes the mold to instantly expand across a surface and toward the fire, creating a new patch that covers a 10-foot square. A patch of brown mold exposed to an effect that deals any amount of Cold damage is destroyed instantly.

Raw data
{
  "name": "Brown Mold",
  "page": 76,
  "__prop": "hazard",
  "rating": [
    {
      "tier": 2,
      "threat": "deadly"
    },
    {
      "tier": 3,
      "threat": "nuisance"
    }
  ],
  "source": "XDMG",
  "entries": [
    "Brown mold resembles a furry, light-brown carpet. This fungus feeds on warmth, drawing heat from anything around itself. One patch of brown mold covers a 10-foot square, and the temperature within 30 feet of it is always frigid.",
    "When a creature enters a space within 5 feet of the mold for the first time on a turn or starts its turn there, the creature makes a {@dc 12} Constitution saving throw, taking 22 ({@damage 4d10}) Cold damage on a failed save or half as much damage on a successful one.",
    "Brown mold has {@variantrule Immunity|XPHB} to Fire damage, and any source of fire brought within 5 feet of it causes the mold to instantly expand across a surface and toward the fire, creating a new patch that covers a 10-foot square. A patch of brown mold exposed to an effect that deals any amount of Cold damage is destroyed instantly."
  ]
}