The Gate: The Immortal Coil Saga, Book 1

We all want to live forever, until we don't.

Amarynn, a legendary warrior who hates everything she's become, desperately wants her existence to end. But there's one problem with that. She's immortal. She's also made a terrible mistake, having given away the secrets of her immorality to Venalise Korr, a powerful mage capable of twisting that magic into something monstrous. Now Venalise has kidnapped Regealth, Amarynn's creator, and stolen the magical stone called The Gate - the key to everything immortal. Determined to right her wrongs, Amarynn enters into an uneasy partnership with the king's son. Together, Amarynn and Jael risk everything to rescue both the mage and the stone. If their rescue fails, Venalise will have the power to create a league of immortal warriors just like Amarynn. With that power secured, the wars between kingdoms will never end. And if the wars continue, Amarynn loses the ending she seeks. Though now that she's gotten close to Prince Jael, she doesn't know if that's a bad thing after all.