Brown mold often grew in subterranean or dungeon environments in large patches of about five feet (one and a half meters) or 10 feet (3 m) in diameter. A patch of this size absorbed enough heat to cool the temperature of the air within a 30-foot (nine meter) radius. Within five feet (one and a half meters) of the patch of mold, it was cold enough to cause non-lethal injury to some creatures.
Brown mold grew extremely quickly when exposed to great sources of heat such as a nearby flame, doubling in size in only a matter of seconds. In contrast, the mold could be annihilated almost immediately by the effects of a spell dealing cold damage They were also known to be vulnerable to high concentrations of sunlight or ultra-violet light.
The mind flayers were rumored to have developed varieties of brown mold that continued to cool the vicinity around them without harming other life. These varieties were said to grow on illithid homeworlds.
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- ↑ 1.0 1.1 1.2 1.3 Mike Mearls, Jeremy Crawford, Christopher Perkins, James Wyatt (2014). Dungeon Master's Guide 5th edition. (Wizards of the Coast), p. 105. ISBN 978-0786965622.
- ↑ 2.0 2.1 2.2 Monte Cook, Jonathan Tweet, Skip Williams (July 2003). Dungeon Master's Guide 3.5 edition. (Wizards of the Coast), p. 76. ISBN 0-7869-2889-1.
- ↑ Gary Gygax (December 1977). Monster Manual, 1st edition. (TSR, Inc), p. 71. ISBN 0-9356-9600-8.
- ↑ Eric L. Boyd (1997). Powers and Pantheons. (TSR, Inc), p. 141. ISBN 0-7869-0657-X.
- ↑ Richard Baker, James Wyatt (March 2004). Player's Guide to Faerûn. (Wizards of the Coast), p. 81. ISBN 0-7869-3134-5.
- ↑ Stephen Inniss (October 1989). “The Dragon's Bestiary: All life crawls where mind flayers rule”. In Roger E. Moore ed. Dragon #150 (TSR, Inc.), p. 12.