This is Book 4 in The Black Phantom Chronicles.

Arnacin and Valoretta have finally reached the shores of Enchantress Island—but the home Arnacin remembers is gone. His family and friends have vanished, drawn into a desperate war in Elcan under Prince Evan’s banner. As Arnacin and Valoretta journey into the heart of battle, they must confront their deepest fears and hardest truths.

For Arnacin, it is a battle against the ghosts of his past, the scars of war, and the love he has long resisted. For Evan, it is a fight for his kingdom, his people, and the man he is meant to become. In the crucible of war, both men must decide: Will they let the past define them, or will they rise above it to forge a new future?