The are jellyfish-like life forms that came from a different space-time location. Because of their nature, the XIG Fighters have trouble combating them until Gamu discovered their location. Upon being defeated, the Primal Mezard can transform themselves into their monstrous forms. The Adventure in Hypserspace novel has Charija acknowledged Psycho Mezard (and to a lesser extent, the Wave Life forms) as part of the forces of Radical Destruction Bringer.
