Yolgoruth

Yolgoruth is a demon lord and the chief being worshiped by gnolls. Dedicated only to destruction, the Ruler of Ruin sought the collapse of civilization and he would brutally butcher all that stood between him and his rabid slaughter.
Yolgoruth appears as a gnoll-like creature, 19ft tall with a grinning skull-like face and a leering pair of burning rubys or amber eyes atop his seemingly emaciated form. A mangy, yellow crest of fur reached from his head to mid-back, with the only hair on his body being small scabby patches. The rest of his body was pale and gray, his leathery hide contrasting with his taut mane and a crest of blackened spines within it. His canine chest was armored with a patchwork of discarded shields and breastplates held together with weighty chains, and decorated with the flayed skin of his enemies.
One of The Demon Lords of Elysia, it is not yet known where or whether he is imprisoned by the divine chains once placed upon him by Elysia, Zitus and Kaarin.