Rebirth (Game of the Gods #1)

Hidden deep beneath the waves of the ocean moon GX-30B is a medieval city, a new playground for the ultra-rich and elite of the United Earth Empire. But this city has a secret, it’s not just a theme park, but a prison built to house the grandmaster assassin Kita.
After defeating the Harbingers, the gods of Infinity deemed Kita too powerful and a threat to all. They stripped Kita of her memories, her Aa’Hagre companion, and her status as a god. Now, she languishes in the city protecting the rich and powerful.
An encounter with her old rival and lover frees Kita’s personality. Now, she must fight to escape the city and flee into the unknown space with a group of defectors and mercenaries. What she finds there is beyond anything she could imagine.