The Keeper of Eden by L.B. Disher

Condemned to the Arena for a crime they didn’t commit, fae brothers Wayden and Nathan are forced to strike a dangerous bargain: serve a new master in exchange for their lives or die at one another’s hands.

When their paths cross with December’s, a captive fae-hybrid, who’s thrust into a deadly world that she’s unprepared for, Wayden and Nathan must earn her trust as they discover that their lives are bound together by a prophecy steeped in ancient secrets and lies.

As war looms between fae and human, and a fanatical cult seeks to unleash an ancient entity hellbent on destruction, the three battle not only for survival, but for each other. Hunted and pitted against each other, all three must fight to change their fates—before the world falls with them.