iuz's empire fell apart 200 years earlier after iuz was captured by the free city's founding wizard, the mad zagig yragerne, who imprisoned iuz in a device called the "godtrap" as part of a bizarre experiment to achieve divinity for himself. decades after zagig (now the archmage demigod called zagyg) achieved his godhood, a powerful mage from the free city named mordenkainen led an expedition into the depths of castle greyhawk.