Untainted (The Crystal Island)

There were several things Vera was quite skilled at. Wielding a blade and pretending to be human were two of them. Following the rules and controlling her anger, were not.
Raised in the heart of the Matherin Empire, Vera spent most of her life forced to hide what she was and what she could do. Until one day, she foolishly confronts a strange male she spies tailing the Crown Prince.
Not only does the altercation not go as planned, but the male claims she possesses a power his people vitally need. He's desperate to return home and refuses to leave without her.
Staying would give her a life she never thought she'd have but leaving could provide her with the only chance to learn more about her past.
The more answers she uncovers about herself, the more questions arise, and nothing is adding up. Vera must decide what to do, not only with her life, but with the ancient power inside her.