A Tale of Darkness & Light - Katelyn R. Honigsberg - Bog

The Sun Queen must marry the Knight of Death to save their kingdoms from the Dark Lord.
When a plague of darkness threatens their border the royals of Cadora and Leran must marry to unite their kingdoms' unique powers to save each other. Queen Reina of Cadora is known to harness light, while the crown prince of Leran, Cayden, is known to be a monster on the battlefield. Together they face trials of politics within Leran's walls, assassination attempts, and a battle of the heart. When the inevitable fight knocks on their door the one to go is not the war-experienced crown prince but the sun queen.