This Dark Shore: The Resonance Cycle, Book 4

Aisling, the Monster god, has bidden her time, waiting for the right moment. With Ty’s return to Volar, and his allies distracted, she will initiate her ultimate revenge. In the eye of the storm, with defeat certain, Ty must make a decision: will he claim the power he has so long resisted, or will he allow the forces of evil to win?

This Dark Shore is the catastrophic, epic beginning of a new phase of the Resonance Cycle.