Aetheria

Once upon a time, tens of thousands of years ago, Aetheria and her sister kingdom, Xelusia coexisted peacefully and served the Light. Then a Shadow fell upon Xelusia's people, and war after war plagued the twin kingdoms until The Cataclysm War, which destroyed both worlds and shattered Xelusia's star. In the days before the Cataclysm, a remnant of Aetheria escaped to a world called Terrearth. The humans who lived there were clever and loyal, but they were not made to endure as Aetherians were, so after a few generations of intermarrying, the Aetherians mostly separated themselves from their human allies. However, The Shadows who served the Aetherians' enemy followed and found new disciples, including the son of the last High House of Adamos. 

The Book of Prophecies of High Oracle Yllumina of Yophriel-Adamos carried a warning to be remembered until the final war was won.