The War was started by Myoken, who wished to to destroy the world and return the universe back to its solitary darkness. Unagi Hyuga, the first Vessel of Ragnarok faced Myoken in a battle that lasted over 100 years, which ended in Myoken being sealed to the Pole Star. The War took a standstill after thta battle for about 500 years till Vessel Kuruk Uchiha faced his father who was involved with the Order of the Apocalypse but not an official member. Kuruk defeated him and ended up killing his father. The world was peaceful but the Order went into hiding.