The Hurricane Wars by Thea Guanzon — book slip

Talasyn has only known the devastation of the Hurricane Wars, growing up an orphan in a nation besieged by the Night Emperor. Her secret power of light magic, thought to be extinct, makes her a beacon of hope against the shadows.

Prince Alaric, heir to the Night Empire, is a formidable force with his shadow magic, tasked with quelling any threats. When their powers clash on the battlefield, they create a new, unprecedented magic.

Forced into an uneasy alliance, Talasyn and Alaric must confront the secrets of the war and their growing attraction, which could either save or doom their world.

For fans of Fourth Wing and A Court of Thorns and Roses.