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Noah was engulfed by the abyssal darkness within the Ancient One's stomach!
It seemed that to fuse with the other half that has been lying dormant within his soul, he had to defeat it through a battle of wills. As there was no physical battlefield here other than just two minds fighting against each other, what Noah needed to do was using his very willpower to win!
However, as the Ancient One had suddenly devoured him, its abyssal stomach, the same one it used to devour the powerful soul of the Blood Progenitor was now trying to digest Noah's mind!
Noah felt trapped within this darkness, as if countless masses of slime and tentacles tried to crush him into nothingness! If he were to lose now… if he were to let it do as it pleased, he as Noah would definitely die, and the other side of his soul, that of the Ancient One, would prevail!
This was the ultimate battle between minds! Noah couldn't let it do as it pleased1
Check "The Protagnist's Sister Is Actually the Strongest"!