Renegade Calamity

The Renegade Calamity (レネゲードの大惨事), or the Great Catastrophe (大災害), is the name given to the series of events occurring approximately 882 years prior to Epsilon's awakening in the original Shunichi Takahashi's body.

The entire catastrophe began with the corruption of the Legendary Knights, excluding Epsilon and two others, and their hidden summoning of monsters to attack Camelot. Upon discovering their treachery, Epsilon engaged and killed his comrades, including his brother Upsilon.

After untold casualties and destruction, Epsilon successfully killed his brother Omicron and saved the world. Unfortunately, since nobody was aware of the other Legendary Knights' corruption, a bounty was placed on Epsilon, deemed a traitor, with the catastrophe finally ending with his death at the hands of Fate Acnologia.