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.
Cold Sensitive. A patch of brown mold exposed to any effect that deals cold damage is instantly destroyed.
Aura of Cold. Brown mold constantly consumes ambient heat. When a creature moves to within 20 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 heal that amount. If the available healing is greater than the Brown Mold's maximum, its maximum hit points is increased by that amount and it expands its size.
Spore Burst. The brown mold releases spores that burst out in a cloud that fills a 15-foot cube centered on it, and the cloud lingers for 1 minute. Any creature that ends its turn in the cloud must make a DC 12 Constitution saving throw, taking 36 (8d8) poison damage on a failed save, or half as much damage on a successful one. Additionally, the target’s hit point maximum is reduced by an amount equal to the damage taken. This reduction lasts until the target finishes a long rest.
Description
Found in dark caverns and remote subterranean passages, the brown mold waits patiently for victims to pass by. Less than an inch thick but spreading over a five foot patch of stone or wood, the tan to dark-brown mold seeks warmth to help it grow. Small bumps along its surface store thousands of spores waiting to be released into the air.
Creatures within 20 feet of the brown mold take continuous cold damage from its heat-leaching effects.
Any living creature that passes within 5 feet of the mold will be attacked by a burst cloud of millions of spores. Any caught within the 15-foot cloud may be overcome by the spores, dying within moments. The spores grow within their new host and crawl back to the main body of the mold, reattaching and adding needed nutrients. Each new victim adds another five feet to the mold’s size.
The brown mold craves warmth and heat; attacking it with fire heals damage and doubles its size. Cold spells will kill the brown mold for good.
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