Dude... You've committed the ultimate sin of writing. You didn't capitalize your I. I'm disappoint in you using i'm.

The Demon Slayer butvmake it as a Class evolution of a warrior or a knight

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YES! :) the EAM is one of the most useful skills. It says with you even in berserker stage

goood chp. Can you give him a Natural Body skill like Sakata Kintoki. In a way the Gamer is also a Natural Body but the actual skill is insane. It make you stronger just by sitting down at the higher ranks. Just like broly

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Can you give a description of how he look like or how tall he is

go o o od ch p. At this point I am just trying every fucking way to write good chapter

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You know I keep reading regis name as Regis Bastard. I dont know why? But anyway I like to suggest The Class system. Make him a warrior first then throw in Mage or Shamen which can later combine to Magic Knight or something like that. And make the Classes give bonus stats for each level in that appropriate classes. It will help you give him more power in the time gaps. And later you can assign him easier when he is summoned as a servant