Tales of Tolgard
These tanar’ri demons are formed directly from the souls of evil creatures sent to the Abyss for all eternity. They are the lowest form of demon, even lower than dretches. They have no magical abilities and are nearly mindless. They act more like wild beasts than sentient lifeforms.
Manes are three foot tall humanoids with pale, bloated flesh riddled with maggots. Their white eyes show no signs of thought while their claws and jagged teeth betray their feral nature. They cannot speak but can understand simple concepts spoken in any language as a side effect of their limited telepathy.