Nagash, the 'Supreme Lord of Undeath', is a formidable Liche embodying death and the Undead. As the founder of necromancy, he rules over all Vampires and Undead. His ascent involved instigating an era of undeath, triggering a necromantic power surge that resurrected the dead across the Old World. This power attracted entities like Vampire Lords and mummified Tomb Kings. His vast, relentless Undead Legions signaled the end of the living era.