Exiled (The Protector Book 1‪)‬

Chase Williams is a demon hunter in the Circle, or at least he was supposed to be. On his fifteenth birthday, Chase stepped up to the altar to claim his elemental power, but it never came. Elemental magic is passed down to a hunter through the bloodline, but on Chase's birthday, the bloodline stopped.
Exiled without the Circle's protection, Chase has spent two years trying to survive a world riddled with half-demons and magic. When he has a run in with a frightened and seemingly innocent demon, he learns the Circle's agenda has changed: the Circle plans to unlock a portal and unleash pure-blood demons into the world. Vowing to stop them, and knowing he can't do it alone, Chase forms a reluctant alliance with Rayna - a sexy witch with an attitude and a secret. In their attempt to stop them, Chase and Rayna find themselves in the middle of the Circle's plan, leaving one of them to decide what their friendship is worth, and the other's life depending on it.