Wikipedia
Erythnul
In the World of Greyhawk campaign setting and the default pantheon of deities for the third edition of the Dungeons & Dragons fantasy role-playing game, Erythnul is the Oeridian god of hate, envy, malice, panic, ugliness, and slaughter. He is known as the Many, and is worshipped by many gnoll, troll, ogre, and bugbear tribes, in addition to humans. His symbol is a red blood drop, or a bestial mask representing Erythnul's changing visage.