A star-faring religious cult has created an army of robotic zealots designed to follow holy scripture. As the robotic menace spreads across the galaxy, it takes prisoners to be 'excommunicated': hooked into a neural simulation of eternal torment. Captain Rolland Barron leads the Sol Federation Starship Excalibur on a diplomatic mission. Cassia LaCroix is a wormhole hunter, earning a living scouring the galaxy for valuable tunnels through space-time. Prince Zoojin, a psychic alien from a distant galaxy, must prove himself worthy of the throne of Paxis Prime. The paths of these characters converge as they pursue their own motives, leading them towards the mechanical legion that is sweeping across the galaxy.