Twins of the Eclipse by Christopher Woods

Cyrus's life is stagnant as Elite Knight and prince to the Emperor of the Chaos. With his royal duties and his sister, Octavia, lingering over his head, he longs for adventure free from responsibility. His life changes when the Emperor Julius entrusts a young prisoner named Celine under his watchful care, but Celine has a deadly secret. She is searching for the one from the Chaos who murdered her mother. Cyrus is captivated by Celine's ocean eyes and the life of adventure he yearned for, but he soon discovers it came with a cost: the life of a brother in arms and Celine is the only suspect. Cyrus finds himself turning his back on his family to help Celine escape, thrusting himself into an uncontrollable conflict. When war breaks between the lands of the Order and the Chaos, Cyrus finds this fate was foretold seventeen years ago on his birth night. Two champions, born on the eve of the twin eclipse, must unite to banish an evil spreading deception across the world. One with the power to heal, and the other with the power to seal but marked with the sign of death. Only then will the balance be restored before it is too late.