Earth's Savor

As Earth grows to be something humans have never seen before, humans themselves are growing more obsolete. An alien race called the Romorei have taken over and killed most humans; those that didn't die became slaves or turned to a life of hiding. Leaving the world to become a new home for the Romorei who are at war themselves.
Through this period, humans began to learn how to scavenge for food in the destruction the Romorei left in their wake. Zena, one of those humans who grew up in caves hiding away, hoped to meet a savior who had once helped her people one day. But she never thought she would ever get the chance to meet him.
Earth's Savior. A stone-cold alien warrior with dark wings that came to Earth to help the humans get their world back.

(Keep in mind that I started writing this in 2018.)