Drsnake_f

???

He did not raise the skill to lvl 2 on his first level but instead unlocked the skill

From the manga? I think it was stated as formless in the beginning but could have changed as the story went on

Parallel thought skill

But it does????

Could be because of defence of both mc and player, as mc's defence reduces the damage "done", reflects dmgx2, which then the players defence reduces and we could end up with 10 dmg. The only variables is the players base damage and the defence of them both

Fission is the cutting of atoms to create power, like necluear plants while fusion is pressing atoms togheter at a high temperature to create power. Cold fusion is like fusion but at lower temperature instead and both is only hypothetical at the moment

Treat it more like PE in our world if PE was superpower training. Some will like it and some not but if it would not impact our futures life in someway most would ignore it