In the Dungeons & Dragons World of Greyhawk campaign setting, Arnd, also known as Arnd of Tdon, was a legendary Oeridian hero who lived ages ago, before the Great Migrations. He is famed for establishing the first paladins of Heironeous among the Oeridian tribes. He is also known as possessor of the artifact known as the Invulnerable Coat of Arnd.