Yeenoghu

Yeenoghu was a Demon Lord known as the Beast of Butchery. One of the few fiends who bore the title of Demon Prince, Yeenoghu sought to destroy his greatest rival, Baphomet and the two often clashed.

Description
Yeenoghu, resembled an enormous Gnoll, wielding a three-headed flail and adorned with the lashed-together armour and shields of his fallen foes. Yeenoghu sought violence, chaos, and destruction above all else, who sought to bring about a world of endless slaughter, brutality, and cannibalism.

History
Yeenoghu visited the world during the Age of Demons, going on a rampage and killing everything in his path. The packs of hyenas who followed the demon lord's path of slaughter in order to scavenge his kills were transformed into the first gnolls, hyena-headed humanoids who shared their creator's savage nature, although he was banished back to the Abyss by Zariel.

In 1451, Yeenoghu once again returned to the material plane, this time accidentally summoned by the Drow as part of Lolth's plot to take over his domain. During his brief excursion to the material plane, Yeenoghu prowled through the labyrinth until he was once again returned to his home.

Followers
Other than gnolls, Yeenoghu had followers among humanoids and Hill Giants. These cultists were mostly insane humanoids who liked to kill and eat their own kind. Such cultists were usually no better than gnolls, in fact they often travelled with their demon-worshipping war bands.

Yeenoghu was responsible for the creation of several varieties of demon, including Maw Demons and Shoosuvas who served him loyally.