1) Greyhawk deity 
In the World of Greyhawk campaign setting for the Dungeons & Dragons fantasy roleplaying game, Tharizdun (n {respell|thahr|IZ|dunn}) is the god of Eternal Darkness, Decay, Entropy, Malign Knowledge, Insanity, and Cold. He was imprisoned ages ago by a coalition of deities to prevent the destruction of existence itself. Although imprisoned, Tharizdu...