Yeenoghu

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

Yeenoghu is the Demon Prince of gnolls and their creator. Many gnolls pay homage to Yeenoghu.

Yeenoghu's might and clout don't compare to the likes of Orcus, but he controls a layer of the Abyss, Yeenoghu's Realm, where he hunts lesser demons while he schemes to conquer other layers opportunistically. Seeking the downfall of civilization, Yeenoghu sends gnoll servants and (rarely) other cultists to attack and destroy cities.

Yeenoghu is often depicted as a massive gnoll about fourteen feet in height. His fur is matted and his armor amassed from fallen enemies.

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

Trivia

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