The Lords of Madness, Vol 4: Yeenoghu
Of all the demon lords, few have made their mark on the world as firmly as Yeenoghu. Though his ravenous hunger is claimed to be a mindless compulsion, there is nothing mindless about the thorough insinuation of his presence in the world via his Chosen: gnolls. But how are gnolls created? First, a Chosen of Yeenoghu must do as their master wills: kill. A hyena that then feasts on the corpse of the Chosen's victim, and a gnoll is born of the glutted belly of the hyena. Gnolls thus born are hunger manifest. They ravage any living being, tearing body and bone asunder, leaving behind only bones. They care not for wealth or material gain, only to satiate their hunger. That satiation is itself an offering to Yeenoghu, funnelled directly to him. Some might envy the gnolls for such a tangible connection to their creator god, but that envy would melt to utter terror as soon as the beasts' rotting breath and wicked cackles make their way through the dark of night. If you should find yourself the object of gnollish pursuit, burn your corpses, cover your scent, and pray to whoever might aid you, for there is no bribing, begging, or reasoning with hunger incarnate.