Molds are part of the class of monster represented by the overall symbol F, in addition to lichens, violet fungi, and shriekers. They come in several colors, and each possesses a specific passive attack. All molds are sessile.
The brown mold's passive attack causes cold damage.
Repeatedly attacking a brown mold can cause it to multiply due to your body heat.
The green mold's passive attack causes acid damage. The corpse of a green mold is acidic when eaten.
The passive attack of the yellow mold stuns you for (level + 1)d4 turns. Its corpse is poisonous and hallucinogenic if eaten.
If you lack the resistance required to neutralise the passive attack, it is best to let your pet attack the mold, attack it with a ranged weapon, or leave it alone. Molds will never move or actively attack you. You could also let your pet take it out but make sure they are strong enough to do so.
In both NetHack and SLASH'EM, the mold sometimes leaves a corpse. In SLASH'EM, the corpse might revive itself ("The yellow mold rises from the dead!"). Also in SLASH'EM, molds may grow on rotting corpses, taking the name of the corpse if it is named (which can result in some unexpected messages, especially in graveyards).
Attacking the grey mold will likely cause it to release spores and give you a fatal Illness. Only seen in Sporkhack so far. Signified with F.
Mold, multicellular organism of the division Fungi, typified
by plant bodies composed of a network of cottony filaments.
The colors of molds are due to spores borne on the filaments.
Most molds are saprophytes. Some species (e.g., penicillium)
are used in making cheese and antibiotics.