In the Dungeons & Dragons fantasy roleplaying game, Tharizdun (/θəˈrɪzdən/) is the god of Eternal Darkness, Decay, Entropy, Malign Knowledge, Insanity, and Cold. He originated in the World of Greyhawk campaign setting but has since also appeared in other settings. He was imprisoned ages ago by a coalition of deities to prevent the destruction of existence itself. Although imprisoned, Tharizdun still has a degree of his original multiverse-threatening power. His holy symbols are a dark spiral rune and a two-tiered inverted ziggurat known as an obex. His holy number is 333.