[spoiler]well I'm gonna drop weaknesses for lego despite him not being in use and won't be anymore. His armour is kept together by straps which Inturn are protected by plates. Removing the plates and severing the straps causes the mighty cosmic iron plates to drop off like his suit developed leprosy. You can put stress on the staps by using blunt weapons, axes are ideal as they're force can bend cosmic iron which makes it easy to pry off. Swords can penetrate his armour but seeming the atomic bonds are made from the cosmos that sword must be pretty strong. Or you can pump him With so much energy from the hits he explodes in an electrical surge weakening him. Its designed to be a tactical fight [/spoiler]