Brown mold fungus draws heat from everything in a five-foot radius, and noticeably lowers the temperature in a 30-foot radius. If it comes into contact with a strong source of heat such as fire, the brown mold instantly doubles in size. It is vulnerable to extreme cold temperatures.
Cytillesh is also known as brain mold. It gives off a bright blue glow equivalent to torchlight and is prized by deros, who appreciate its benefits and are not fazed by its severe detriments. Thus it can often be found growing on the walls and ceilings of dero communities.
Prolonged exposure to cytillesh can slow ageing by half. Derro also believe it provides mental enhancement and is responsible for creating the exceptional dero they refer to savants. It also causes stillbirths, birth defects and insanity, which the dero view as minor drawbacks.
Ghost mold is found in areas of strong necromantic activity. It is a faintly glowing black dust and hard to spot even for those who have encountered it before.
It reacts if living creatures approach within five feet, throwing out a cloud of spores in a 10-foot radius. These spores attack both the mind–potentially causing fearsome hallucinations of death-and the body, draining away life energy.
The body of a creature completely drained of life energy becomes a new patch of ghost mold. The victim's soul might briefly remain to haunt the area as a ghost, until it too is destroyed by the ghost mold's feeding.
Green slime is a highly acidic type of semi-intelligent mold that can destroy flesh and other organic materials on contact. It clings to walls, floor, and ceilings, and can detect movement to drop onto prey below. It can also affect wood and metal, but not stone. A creature covered in green slime is quickly dissolved unless the slime is scraped off, frozen, burnt, or destroyed by sunlight.
The dangerous fungus known as russet mold releases a cloud of spores whenever a creature approaches within five feet. The spores take root in the lungs of unfortunate victims, and in severe cases the creature dies. A day after being killed by russet mold, one or more fully grown vegepygmies emerge from the corpse, with the exact number dependent on the size of the slain creature.
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