Vecna did not stay gone forever, and rose as a demigod of magic and secrets in the world of Greyhawk. In 581 CY, his cult helped set events in motion that would have granted him the power of a greater god, but the plan was ultimately foiled. After these events, Vecna ended up imprisoned in the demiplane of Ravenloft, but broke free again later, emerging with the power of a greater god, after absorbing the power of Iuz. He then broke free into the city of Sigil, where he came perilously close to rearranging all existence to his whims. (Vecna's multiverse shattering campaign in Sigil is used as an in-universe way to explain the differences between the 2nd and 3rd editions of "Dungeons & Dragons.") When Vecna was ejected from Sigil by a party of adventurers, Iuz was freed and Vecna returned to Oerth greatly reduced in power, though still a lesser god.