Jingle303
Thanks for the chapters, this is interesting, keep up the good work, I hope you stick true to the frieren power system, have you read the manga?, though it should take a very very long time for him to alter his mind safely, I mean brains are very complex so he could figure some simple stuff out in a few months but they are complex as I have said before, and that is without this world having magic where they can use magic from their imagination and/or studying and figuring out the principles, like how the humans managed to recreate that demon general's magic after a few decades, but I am just staying this to share my thoughts/opinion, ultimately this is your story and you should write however and whatever you wish, good luck