The Grimsah Forest — K.L. Beckman

The world is hanging precariously in the balance between the good and evil forces who have come to earth in the aftermath of human wars using nuclear bombs and biological weapons. The planet has been decimated. Nations have fallen. Technology has been eradicated. Those who survived have begun rebuilding, but all will be destroyed if evil forces, led by Leibus, win. One girl, unaware of her own power, may determine the fate of the planet and of humanity.