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Over time, the young man's research and his regained memory fragments led him to a conclusion that could be said to be extremely wicked. As he was detached to his own humanity and saw this entire world as just a playground for him to see beasts and humans fight, he decided to move forward. Without having even developed any attachment with his parents, or anybody within his own tribe, he create new spells, and in secrecy, utilized dozens of people as sacrifices, starting a strange ritual that connected him to another Realm.
Check "The Protagnist's Sister Is Actually the Strongest"!