Responses
Well fire and no lightning is obvious, he's been using them since the beginning. When she met the teacher person she bought him a chance to expand his elemental range- which is what other ppl do to get them as well- and he wanted a shadow element (which he got and now uses it to travel fast in the shadows) but also ended up getting a summoning element (which is what he's upgrading in the school currently)

sorry i'm already in chapter 100+ not technically the end since sadly i have other things to do ╥﹏╥ but the description said he has "all" magic? when even after a hundred chapters he still has two is it gonna come out later on in the story after being better at becoming intermediate tier magician or something?