Kingdom of War by Tricia Copeland

Each of the other two of the trinity completed their transformations to become a full witch. Then it was Hunter’s turn. Everything hinged on him completing the trials. Danger lurked beyond their every turn, but no one had ever seen a granting of powers like his and they couldn’t have foreseen potential risks from within their ranks. What did it mean for his future, for the trinity? Could they maintain their bond with a shifting balance of power? Hunter vowed to see their mission to completion, but a darkness within him ate at his psyche. Would he let it consume them or could he triumph over the growing evil?