Storm of Shadows by Holly Rose

The path to vengeance is fraught with shadows…
Reyna has lost everything: her friends, her family, her home. Her heart forever shattered, she seeks retribution for the wicked sins committed by the man she once loved.
Her sole ally is Natharius, the Void Prince of Pride, whom she summoned from the darkest depths of the Abyss in exchange for her soul. But this terrifying demon has no interest in the trivial affairs of mortals and would sooner see Reyna dead than be forced to aid in her quest.
Reyna’s pursuit of vengeance takes her far across foreign kingdoms, where she discovers both new friends and enemies. An ancient evil stirs, threatening the safety of the entire world. And the Void Prince bound to her soul holds secrets of his own, secrets which could be the key to Imyria’s salvation.