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 and vegan.
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 neutralize 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. If you let your pet take it out 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!"). Of little importance, when level drained, the draining persist between revivals, like with trolls. Also in SLASH'EM, molds may grow on rotting corpses.
In an old bug, molds growing on corpses would take the name of the corpse if it was named. In practice this can be encountered if one is trying to play older patches.
Slash'EM Extended adds playable mould and ungenomold races, and while the player is in mould or ungenomold form, they have many disadvantages associated with being a fungus. The main disadvantage is the lack of limbs. However, these races also have uncurable polymorphitis, and being in ungenomold form is impossible since they genocide themselves right at the start of the game, forcing them to be polymorphed into a monster for the entire game (although they can change their form, they may never revert back to ungenomold). On the other hand, a mould character fully experiences the lack of limbs that prevents picking up items, putting on armor, opening and kicking doors, etc.
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.