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The Hivemind had raised into a God! Thanks to the accumulated power from the prayers and beliefs of his cult members around the world and the people they had managed to brainwash and force into his believers, he had accumulated enough power to the point he was able to go through a qualitative and quantitative change.
Although he had to leave his body behind in the process, he gained unprecedented power he had never had before through that sacrifice! Although it would had been way better if the ritual where he could get a powerful vessel would had been completed, this was more than enough for him!
Now that he had gained such incredible power, the only thing left to do was to reabsorb his body, devour the trees, the people, and any living being in the planet, and ultimately assimilate all the planet and become a planet-sized hivemind!
Check "The Protagnist's Sister Is Actually the Strongest"!