Nemesis was the leader of an army that opposed Seiros during the War of Heroes that included the Ten Elites. He possessed the Crest of Flames and wielded the Sword of the Creator. In Imperial Year 91, the armies of Nemesis and Seiros clashed at the Tailtean Plains. There, Nemesis was confronted and slain by Seiros in single-combat. Academy Phase Many years after Nemesis died at Tailtean, the newly appointed professor of the Officers Academy, Byleth, is tasked with subduing thieves in the Holy Mausoleum during the Goddess' Rite of Rebirth. The leader of the thieves opens the coffin of Seiros, and removed the Sword of the Creator from it. The thief attempts to use the sword to defend themselves against Byleth, however, Byleth is not only able to easily overpower the thief but also awakens the sword's power, despite the missing Crest Stone. The next day, Archbishop Rhea thanks them for dealing with the thieves and protecting the Sword of the Creator, and in reward entrusts Byleth with the sword. Surprised by her decision, Seteth warns Rhea to reconsider, as if someone like Nemesis were to appear again, Fódlan would be consumed by war. Unaware of the history of Nemesis, Byleth asks the two about him. Seteth and Rhea explain to Byleth that when Fódlan was attacked by wicked gods, the Goddess gifted Nemesis with the Sword of the Creator, and he used its power to save Fódlan, earning the title of the King of Liberation. However, over time, his power corrupted him and he waged war across the land, forcing Seiros to put him down. Rhea trusts that Byleth will not be corrupted like Nemesis and leaves the sword to them. Shortly afterward, Byleth meets with their colleague Hanneman who reveals to them that they are in fact the descendant of Nemesis and inherited the Crest of Flames from him, hence being able to wield of the Sword of the Creator. The birthday year below is in Fodlan time, not in modern days measurement of years and time.