Center Moon - The Stone Of Cordova [Book One]

The monsters from a far off planet are set on raping the lands of Thanos for its rich food supply. During their conquest they find out that humans and Slefs (gnome like people with magical powers) also taste pretty darned good when grilled just right. Now the future of Thanos falls into the hands of two brothers who were raised in a small village outside the major population center of Haku City. They were both separated by circumstances and are brought together by the evil Gorg Army.