World of Wreckage: A Dark Sci-Fi Epic Fantasy - Abby Goldsmith

In a ravaged city, a giant among warriors risks everything to liberate the galaxy in the epic third installment of this dystopian space-opera adventure. Ariock Dovanack never asked to be a hero, let alone a demigod. But when a prophecy deemed him "The One," he dutifully amassed thousands of messianic followers in the sun-starved civilization beneath the Torth Empire's capital. Now, destined to lead the cave-dwelling Alashani people into the light of other worlds, he and a small army must first annihilate the formidable telepaths who guard the city's spaceport.
By Ariock's side is Thomas Hill. A Torth/human hybrid, Thomas may be physically vulnerable, but he's also a telepathic supergenius. With their combined powers of healing brawn and awesome brain, Ariock and Thomas share a fearsome reputation among their enemies in the Torth Empire. To the ruling supergenius known as the Upward Governess, they're outlaws who must be eliminated at any cost-even if it means sacrificing her own armies.
As if that weren't enough, on his daring journey to the spaceport, Ariock encounters a legendary hero: his own great-grandfather, Garrett Dovanack. Thought long dead, it seems the old man has actually been stationed among the galactic Torth as a sleeper agent all this time.
Forswearing his prior allegiance and quickly switching sides, Garrett unveils a seemingly perfect path to victory for Ariock. But he has sorely underestimated Thomas, and his wrong-headed assumptions could topple his great-grandson's mission-and doom the first civilization Ariock has sworn to liberate and return to glory.