Crowns of Nyaxia. Snake and wings of the night. Book one of the dilogy about the nightborn

One day the king found an orphan girl in the ruins, took her to his palace and raised her as his own daughter. But the king was not simple, he controlled the night-born vampires, and the girl remained human. A stranger to both vampires and humans, Oraya decides to participate in a deadly tournament, the winner of which will receive the blessing of the goddess. After all, this is the only way Oraya will get rid of human shortcomings and become equal to her adoptive father. And he will also gain the strength needed to find his relatives, who may still be alive. To win, Oraya is forced to team up with her opponent. Gradually, the allies inevitably realize that they are connected by something more than the desire to win the tournament...