Prehistoric Battle Between the Fae and the Demons

This battle is an event that happened long before the books in the series.

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The Fae and the Demons had a battle for power before many things existed. They created beings like the Elklorian Gods to help them battle, and were evenly matched, until the dark gods the Demons created decided to join the Fae in the battle, ending up with the Fae overpowering the Demons and imprisoning them in the planet of Inferna.