The Helverti Invasion

After a global war had crippled Earth's civilization, lizard-like aliens had thought they would have no trouble in moving in and taking over. That was a big mistake—secret galactic agents had been training the mystic warriors of Earth to defend themselves against just such a power grab. The alien sociopaths had expected the low-tech humans to be easy pickings, but instead they found they had stumbled into a buzz saw, and were soon driven off. Now, years later, he has just completed his training—and not a moment too soon. The Helverti, furry but definitely not cute aliens, were members of a cult that revered chaos and tried to spread it throughout the galaxy. To that end, they plan to plunge the different tribes of humanity into war. It's mystic warriors vs. alien technology—and the Earthlings are not as weak as they appear....