The Return of the Lifebringer (Children of the Sun Book 3)

After defeating Irif, everyone assumes that the hardest part is over, and that they can finally relax for a moment. But while flying back to Enoria, Kaleth and the others are attacked by an ancient enemy, who they thought was long dead. And he has an army of newly-turned Eternals at his disposal to help him achieve whatever his goal is. Kaleth isn't planning on letting him get that far, though. He just knows that innocent people are dying, and he is going to put a stop to it or become one of them. And he just might.