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The Hivemind was desperately fighting for his life, he had foolishly attempted to fight against her due to his lack of battle experience, thinking she was still weak and that she would be defeated if he tried hard enough, but that wasn't the case, Manationia was actually already stronger than him the moment she cut off his endless source of energy by curing the brainwashing of those that he had brainwashed! There were now barely any members of the cult praying for him, and around 80% of the cult members were all brainwashed as well anyways, so there were very few left for him to gain any power!
Check "The Protagnist's Sister Is Actually the Strongest"!