Saberthorn by Sheri-Lynn Marean

After a thousand years, immortal shifter Saberthorn despairs of ever finding the one person to make his dragon soul sing, until he locks gazes with Tirah. His mortal enemy.

When the Ilyium druids lure Saber’s niece into a spelled witch circle and murder her, then suck his brother into a hell realm, Saber vows vengeance. Within days, he’s tracked and disposed of all but the last witch responsible. Ten years later, and on the verge of losing his humanity and scorching the realms, Saber has finally found her.

Born of mixed blood and hated for her difference, Tirah suffers the abuse of her brother, superior, and fellow trainees in silence. Determined to reach the top of the soldier ranks and hopefully find some peace, Tirah’s elated when she’s suddenly promoted. Then she’s sent on her first mission and catches sight of the enemy. He sets her heart racing. But when her superior commands Tirah to do something despicable and wrong, she has a choice to make. Obey, or forfeit her life.