Lemure
From Ardrana
The lowliest denizens of Baator, lemures are grotesque, disfigured blobs of molten flesh, with a vaguely humanoid torso and head. Their faces are equally unrecognizable, with twisted, melted features molded into permanent expressions of horrid anguish. Sometimes, lemures display some slight vestige of their mortal life: a facial feature, nervous twitch, or a small shred of clothing. However, these fragments of their former lives become less and less apparent as the lemure passes its tortured, wretched existence as the weakest baatezu in Baator. Lemures have no minds and no means of communicating.
Unless ordered otherwise, lemures relentlessly attack anything except another baatezu, regardless of danger. In combat, their main strength is in their large numbers. Lemures attack in wave after wave, dozens of them, until they either wear down more powerful opponents or are destroyed.
Lemures have no mind of their own, so they are immune to any mind-affecting spells such as charm person or illusions. They do not, however, have the spell-like abilities common to other baatezu. Lemures regenerate -- any piece of a lemure, even its burnt ashes, regenerates until the creature is whole again. The only way to permanently destroy lemures is with holy water or other holy item.
Lemures are wretched creatures, forever tormented by the other baatezu. Their existence is both dismal and insignificant. They wander the first two layers of Baator in large hordes, avoiding other baatezu and relentlessly attacking intruders. Sages believe there are infinite numbers of lemures on Baator. Other baatezu consider the lemures beneath notice.
Note: Lemures originally appeared in this form in the Planescape Monstrous Compendium for the AD&D game from TSR. Their use here is for the purposes of providing context for the campaign only.