A robot from an alternate future, KAY/O was created by the humans of that time to fight back against the radiants that they were at war with. Using the power of polarized radianite, KAY/O proved effective in shutting down radiants' abilities, making them easier to eliminate. The radiant Reyna was of particularly high importance to KAY/O for her actions against humanity, and KAY/O was able to eventually eliminate her. However, at this point humans had already suffered severe losses.