Ghoul

Ghouls are undead creatures, once Human, who now feed on the flesh of corpses. Although the change from Human to ghoul has deranged and destroyed their minds, ghouls have a terrible cunning which enables them to hunt their prey most effectively.

Ghouls are vaguely recognizable as once having been Human, but have become horribly disfigured by their change to ghouls. The tongue becomes long and tough for licking marrow from cracked bones, the teeth become sharp and elongated, and the nails grow strong and sharp like claws.

Note: Ghouls originally appeared in this form in the 2nd Edition Monstrous Manual for the AD&D game from TSR. Their use here is for the purposes of providing context for the campaign only.