Ghouls are flesh-eating undead born of mortals that ate the flesh of other sentient beings. Their most infamous ability is to paralyze those they strike, rendering their victims incapable of defending themselves against the attacks of the ghoul and their brethren. They also spawn other ghouls from those they kill.
Ghouls vaguely resemble what they were in life, but their skin is stretched and emaciated, their hands are curled into claws, and their mouths are distorted into sharp-toothed maws.
Ghouls first appeared in the White Box set for OD&D. Their paralysis here is ineffective against Elves.