Blood Omen era refers to the period of Nosgoth's history in which the events of Blood Omen: Legacy of Kain occur. Some events of Legacy of Kain: Defiance also take place in this era. Most of the important events of the Blood Omen era occur in a single year. It is debatably the single most important year in Nosgoth's history. Kain, a nobleman, is murdered by hired brigands in Ziegsturhl. In the Underworld, the Necromancer Mortanius offers Kain revenge against those who killed him. Rashly, Kain accepts and Mortanius brings him back to life as a Vampire.