Eternal Darkness by Stacy Reid — book slip

Princess Saieke Shyokara is on the run from a blood oath that binds her to the tyrant king of the seven realms. Her escape leads her to the Darkage, a land feared for its shadowed demons.

Here, she encounters Archduke Drac EL Kyn, a Darkan known for his deadly skills and irresistible allure.

As Saieke navigates the treacherous politics and dangers of the seven realms, she finds herself drawn to Drac, despite the forbidden nature of their attraction.

Drac, tasked with uncovering the factions responsible for his king's murder, must decide whether to claim Saieke as his mate or protect his kingdom from war.

First in the Amagarians series.