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.
Publication history
Advanced Dungeons & Dragons 1st edition (1977-1988)
Erythnul was first detailed for the Dungeons & Dragons game in "The Deities and Demigods of the World of Greyhawk" by Gary Gygax in Dragon #71 (1983). Erythnul was subsequently detailed in the World of Greyhawk Fantasy Game Setting (1983).
Advanced Dungeons & Dragons 2nd edition (1989-1999)
Erythnul was one of the deities described in the From the Ashes set (1992), for the Greyhawk campaign, and appeared again in Greyhawk: The Adventure Begins (1998).
His role in the cosmology of the Planescape campaign setting was described in On Hallowed Ground (1996).