Kaius was a Sith Lord who joined the Eternal Alliance against the Eternal Empire around 36323631 BBY. Kaius became embroiled in an argument with the Sith Acolyte Leta, who that Valkorion—the former Sith Emperor—was testing the Sith and that everything that had happened was part of his ultimate vision for the galaxy for the state of the Sith Empire. Kaius, on the other hand, blamed the former Emperor for both the Eternal Empire and the Sith Empire's current state.