This feels like it could Roxas' ABSOLUTE Final Limit, Light's Last Sanctuary (came up with that on my own :3). The entire battle field becomes this look, and Roxas is many times faster and stronger, plus he can teleport while it's active and he can control the battle field to screw up his opponent, since it's technically his own realm. However, doing so puts a tremendous strain on him, and using this Limit, while almost guaranteeing victory, knocks Roxas out for several hours.
Different note, AMAZING! Why aren't I following you yet? To the DA Watch button!