The Lich Queen. Goddess of Death, Undeath and Secrets.
Originally a powerful elven wizard, Vecna learned necromancy from Malaraxis, beginning her 700 year conquest that would slowly envelop nearly all of Tetherin. Obsessed with knowledge and secrets drove her mad on her search for eternal life. (Needed more time.) She apprenticed to Malaraxis, surpassed her master and struck him down to create the first dracolich. During her reign she constructed the City of Phylacteries, and achieved godhood, disappearing from the realm.