Yeenoghu

Yeenoghu is one of the demonic lord of the Abyss that once roamed the Prime Material Plane. It is a large, bestial, feral, angry demon. Ever-hungering, ever wandering to conquer and devour in its wake, leaving destruction, fetid meat, and waves of yipping, angry hyenas to devour what was left behind.

Yeenoghu is the Demon Prince of gnolls. Whether he was a mortal gnoll who became a bestial and savage demon, or a demon who simply saw kinship with the gnolls, this demon considers himself the patron god of gnolls. Indeed, many gnolls pay homage to Yeenoghu.

While Yeenoghu is powerful, he is not in the same league as other demon princes (such as Orcus) in terms of personal power, influence, or armies. Yeenoghu controls a layer of the Abyss that he called "Yeenoghu's Realm". There, he hunts lesser demons and other creatures, while he plots his next conquest against weak rulers. Favoring the spread of savagery and barbarism, Yeenoghu sends gnoll servants of the Cult of Yeenoghu to strike at cities and cast them down in burning ruin.

Yeenoghu is often depicted as a massive, gaunt gnoll about twelve feet in height. Yellow fur appears in mangy patches over pale and gray flesh, and his amber-colored eyes are large and protruding.

Yeenoghu's symbol is his unique exotic weapon: a huge triple-headed flail.

Trivia

 * Yeenoghu is one of the Demon Lords described in Book of Vile Darkness, a supplement for Dungeons & Dragons, 3rd ed.
 * Yeenoghu is described in Fiendish Codex I: Hordes of the Abyss a 3.5 ed. book
 * For 5th edition Yeenoghu is described in Volo's Guide to Monsters