Astroidal fungus grows on rocky asteroids in deep space that consist principally of micas, feldspars, and water ice. It lives on minerals and ice in (and on) the rock, and it emits oxygen and nitrogen that occur naturally in the rock as a waste product. It cannot survive bright light, heat, or radiation. While dangerous to disturb, it is prized by spelljammer crews because if rocks on which it grows are placed in a ship's hold, the fungus generates breathable air. A 10' sq ft patch of fungus generate enough air for one humanoid.
When exposed to infrared light or any heat source warmer than its surroundings, it emits a thick cloud of Endothermic spores in the direction of the heat source. The Endothermic spores contain ammonium nitrate and do cold damage.
Multiattack. The fungus makes 1d4 Endothermic Spores attacks.
Endothermic Spores. Melee Weapon Attack: +2 to hit, reach 10 ft., one creature. Hit: 2 (1d4) cold damage.
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