The origin of the gnolls traces back to a time when the demon Yeenoghu found his way to the Material Plane and ran amok. Packs of ordinary hyenas followed in his wake, scavenging the demon lord's kills. Those hyenas were transformed into the first gnolls, parading after Yeenoghu until he was banished back to the Abyss. The gnolls then scattered across the face of the world, a dire reminder of demonic power.
Gnolls are feral, hyena-headed humanoids that attack without warning, slaughtering their victims and devouring their flesh. Gnolls attack settlements along the frontiers and borderlands of civilization without warning, slaughtering their victims and devouring their flesh.