On the continent of Aetheris, Astral Beasts are living mysteries that can fuse with humans and become weapons, armor, and legendary relics. Those who command them are known as Beastbinders, and the Astral Bureau keeps the world in balance by hunting corrupted Dreadbeasts. But when rookie hunter Ethan Cross accidentally forms a forbidden bond with an endlessly evolving Beast, his power begins to climb without limit.
