The Callisto system is an imperial colony in the Hyperion Spiral, fully controlled by the Malverand Intergalactic Empire. It lies 37.5 light-years from Valrindor, southeast of the imperial center. Eira wants to return to discover and visit Callisto, Oberon, and Amalthea. Callisto, Oberon, and Amalthea are also the names of Ozaith's children, adding Callisto to the recurring Malverand-Ozaith pattern.