Pearseus, Rise of the Prince (Book 1 of the Pearseus epic fantasy series)

"Pearseus does for ancient Greece what Game of Thrones did for Medieval England." 

Three hundred years after humans crash land on Pearseus, Styx, the Capital's cruel ruler, learns of a dark prophecy: Cyrus, a young boy, will one day slay her. She imprisons him, but days before his execution he escapes with the help of the First, the planet's native inhabitants. On their way to safety, nightmarish monsters attack. Cyrus flees, scared and alone, until a pair of First warriors rescue him and spirit him away to the mysterious Old Woman. 

All Cyrus wants is to reunite with his family. But the Old Woman insists Cyrus is the foretold instrument in the First's ancient war against a shadowy enemy who will stop at nothing to prevent him from fulfilling his destiny. Heart and mind war within Cyrus as he must choose between rejoining his family and preventing humanity's extinction.  

Rise of the Prince is the first book of the Amazon genre best-selling series, Pearseus.