Yeenoghu, the Beast of Butchery

The Beast of Butchery appears as a great battle-scarred gnoll, towering 14 feet tall. Yeenoghu is the Gnoll Lord, and his creations are made in his twisted image. When the demon lord hunts across the Material Plane, packs of hyenas followed in his wake. Those that ate of Yeenoghu's kills became gnolls, emulating their master's ways. Few others worship the Beast of Butchery, but those that do tend to take on a gnoll-like aspect, hunched over, and filing their teeth down to points. Yeenoghu wants nothing more than slaughter and senseless destruction. The gnolls are his instruments, and he drives them to ever-greater atrocities in his name. Yeenoghu takes pleasure in causing fear before death, and he sows sorrow and despair through destroying beloved things. He doesn't parlay - unless he becomes bored. The Beast of Butchery has a long rivalry with Baphomet, the Horned King, and the two demon lords and their followers attack one another one sight. The Gnoll Lord is covered in matted fur and taut, leathery hide, his face like a grinning predator's skull. Patchwork armor made of discarded shields and breastplates is lashed onto his body with heavy chains, decorated by the flayed skins of his foes. He wields a triple-headed flail called the Butcher, which he can summon into his hand at will, although he is a likely to tear his prey apart with his bare hands before ripping out its throat with his teeth.