Fierce Tides — L.M. Preston

Fierce Tides, Book 3, in the Purgatory Reign Series
Peter Saints understood the reason he was hated and hunted by an evil so twisted he had to brace himself to face it. He didn't mind taking his part of the blame of unleashing it. Now he would destroy it for nothing less than to calm the fear he'd seen simmering in Angel's eyes. The love he had for her was boundless, he'd fight anything to heal it, heal her, and free them. This made it personal. He would finish it.

Purgatory Reign (Book 1) Deviant Storm (Book 2) and Kindle World novella Colliding Souls from Runes World complete the series.