Everything is great with this story such as the writing quality and world building and grammar etc. However the MC’s magic usage is pure trash. All he does with magneto level magic is make some springs around his legs to jump farther and make some type of sticks called eskrima sticks or something. The number of times these words “escrima sticks” have been mentioned is over the top.
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LIKEHe does improve his magic later in the story(Sun arc), or mb better to say that he already has the various new magics but is holding back? Dunno, author kinda implied that he had them for some time when he introduced them. As for cars, you need to remember how his magic works, he need to be familiar with various metals to analyze them to produce himself, so its kinda make sense for him to work and produce cars or Erza's armor.