Ascarion: The Chronicles Of Ealiron, Book Four

On the isle of Tromb in the far northern realm of the Gray Isles, a rift has appeared in the time-line of the world. Cloaked beneath a turbulent monarchy, rumors of an evil god and the tears of a princess, it has gained the attention of wizards. When Rhinne of Tromb, a lonely princess at odds with her own people, lands on the bad side of a dark order of warlocks taking over the realm, she flees overseas, pursued by her father's assassins. Beset by war, her brother Wulfgar discovers a text that exposes a god as the origin of the rift, a shattering indiscretion that involves Rhinne. He sets sail and brings the text to Lorth of Ostarin, a powerful wizard and servant of the old powers. Accompanied by an army, a mysterious raven and a war god with a private agenda, Lorth, Rhinne and Wulfgar must navigate a dangerous landscape of assassins, thieves, spies and seers to return to Tromb and cast down their otherworldly enemy before he plunges the world into horrific devastation.