Denial - The Realm Series, #1

Averie's journey begins as the Realms collide. Greed and betrayal divided the Realms, and the power to restore them is hidden inside a young child. As she grows up, her world is normal, safe; that is, until she turns eighteen, and the mysterious Silas arrives, claiming to be from another world. Her world. The more she learns about him, the more she comes to trust his stories. She can feel her own power brewing as he teaches her about her newfound destiny. With the help of Silas and her adopted brother Thane, Averie strives to gain control of her abilities to take back the Realms from the Betrayer.
With great power comes great responsibility-and tremendous loss.