well I specifically stated that the only elements he starts knowing are the ones on our periodic table of earth, he can assimilate more if he finds them during a match, someone with a sword made of some kind of special sword that he could scan for example. He cant absorb kinetic energy from strikes because that is to OP even I know that, and I limited the amount of energy types he could absorb at one time as two. Noone is going to put enough energy into him that it will make him go nuclear. They would have to stand there for like six post and pump an enormous amount of energy at him. By matter transformation I stated that the larger and more complex it takes more time to do. All that being said ill wait till schradinger post what he thinks then edit him.