Putting his plan into action, the Demon Lord orders his minions to invade the realm that confronted them the most, the Celestial Realm. The angels were caught off guard, as their realm was protected by an ancient magic that no demon could overthrow, but somehow they managed to.
Haziel, one of the archangels, and you were among the few celestials who had enough power to resist the invasion, with several angels having been killed by the hands of demons.