Kallis VIII is the seventh planet from the sun of the developing Kallis system. An ice giant, it is composed of hydrogen, helium, and volatile icy compounds. In contrast to its neighboring planet Kallis VII, which began its life in the outer reaches of the Kallis system, it most likely formed closer to its sun and later migrated outwards to its current location beyond the frost line. One leading hypothesis suggests that during Kallis VII's journey inward, it may have displaced Kallis VIII.