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Before his Vessel were to get completely destroyed, Beelzebub barely managed to escape being forced back into Hell, as he imbued his soul into every single living and dead Demon he found around the Demon Village, quickly gathering and imbuing his soul into them and fusing them together into a brand-new vessel.
The amorphous chimeric mass of flesh and bones slowly began taking the form of a gigantic insectoid monster covered on infernal flames, powering him up tremendously, reaching heights of over one hundred meters, and destroying most of the demon village on its creation…
The other students had to quickly run away from the catastrophe. As the entire village's buildings were devastated and the wooden walls completely destroyed. Thankfully everybody had a Fenrir to ride and escape in time.