Stardust Child by Melissa Cave

Their marriage was forged by the end of a war. Now it’s all that stands between them and the Empire.

On the edge of a dangerous frontier, Remin and Ophele struggle to build a home in the ruins of a century of war. He’s a knight and a general, shaped by a lifetime of violence. She’s a secret princess raised in silence. Though he was promised her sister, they found a love that could be the foundation of a dynasty.
But there are many monsters that still need slaying, from the mindless devils outside the gates to an undeclared war by the Divine Emperor. As a bloody summer wanes toward a deadly harvest, Remin and Ophele must unite to protect their people from beasts and betrayal, secrets and sabotage. And it will take a reckoning with the past if they hope to face the future.

Stardust Child is the second book in the Empire of the Stars series: a romantic epic of loyalty, quiet resilience, and the dream of building something that lasts. Perfect for anyone who loves the monsters of The Witcher, the high-stakes strategy of Game of Thrones, and the rich and intimate romance of Outlander.
Begin this unforgettable journey with Traitor Son, Book 1 of the Empire of the Stars, to discover how Remin rose from a despised son of traitors to the Empire’s greatest hero—and how Ophele’s father destroyed his world.