Mohrg
Mohrgs are a species of evil undead native to the worlds of Dungeons & Dragons. These horrible monsters, which look like skeletal - or at least horribly decayed - bodies infested by monstrous, slimy, purple worm-things tnat essentially resemble fiend-possessed entrails.
Debuting in Dungeons & Dragons 3rd Edition, morhgs arise spontaneously - or are created by necromancers from - the bodies of unrepentant mass-murderers. They still retain their murderous urges, and are at least quasi-sentient - about the level of ghouls, at least; not as impressive as liches, but far more malignantly cunning than zombies.