Amnizu

Amnizu, also known as styx devils, were powerful baatezu found mostly on the layer of the Nine Hells called Stygia.

Description
Amnizus were green, gruesome humanoids with short, squat bodies and stubby limbs. They usually stood between tall and weighed 200 lbs (91 kg), although older amnizu could grow past  tall and could weigh over 700 lbs (320 kg). Sprouting from their backs was a pair of large, leathery wings colored black but with a silver trim. Their bald heads were disproportionately large and elongated compared to the rest of their bodies, hosting porcine eyes, a pug-nose, and a mouth full of jagged teeth. As amnizus grew older they began to further dress their corpulent forms in the robes of office.

Personality
Amnizu were aloof, thanks to their position as members of the 'nobility' of the Nine Hells. They were hateful toward any other baatezu short of a pit fiend or archdevil as they were the creatures in charge of promoting them to an even higher station.

Society
Amnizu were typically charged with one of three duties, either as guardians of the River Styx, as the generals of mighty armies of abishai and erinyes or as the ferriers of new souls into the Nine Hells.