Retribution - The Shiny Skin Wars, #3

The Shiny Skin Wars - Book 3 - RetributionShiny Skin learns of an amazing woman from his own world who has escaped and built an army and freed her people from slavery. He urgently sets out with his army to the Kingdom of the Slith to help her. Sarah, the woman he rescues, is an Astronomer with extraordinary mathematical skills. She views their place in this horrifying world as part of an ancient game created by the Gold People, and she predicts how the game might be brought to an end.
But the future of this world now revolves around a man from Shiny Skin's past whose own plan for wealth and glory will unexpectedly change the balance of power of the world forever.