The Bone Dagger by Clara Rhodes

Born with the blood of a hell god in her veins, Helaina Ironblood has lived her life in secrecy, hidden from a realm already teetering on the edge of ruin. When tragedy shatters her family and the heir to the throne is lost, Helaina is cast into exile—her cursed power now a beacon to enemies who would see the world burn. Beyond the Ash Cliff Mountains, monsters stalk the land, and darker forces hunger for the weapon Helaina carries within her.

Seized by Theodon Wrenn, the feared captain of a mysterious legion, Helaina is thrust into a war that stretches far beyond her imagining. Ruthless, commanding, and bound by secrets of his own, Theodon believes she is the key to victory. Yet the more he tries to bend her to his will, the more he is drawn to her defiance—and to the dangerous fire in her blood. Unlocking her power requires the Bone Dagger, an ancient relic that binds gods, beasts, and mortals alike, but demands a price—Helaina’s mortal life.

Torn between the man who would sacrifice her and the destiny she never wanted, Helaina must decide whether her curse will bring salvation … or ruin.