Jax, a galactic warrior and signature gladiator in the Ajarian Games of the Colosseum, and his cousin Tycho, a war-raised magics user with the power of a god, are threatened by a formidable challenger and warlord from a different realm. As their indestructible way of life quivers before the weight of a galaxy-scale invasion, the two demigods do as immortal, all-powerful cousins do: quarrel about what to do next.