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Chaos had completely lost track of reality as he was chasing down the Forbidden One with the furious berserk Aruliel at his side. The two were fixated in this bastard, as Chaos really wanted to finish him off before he would to become a bigger problem than he already was.
The Forbidden One's Ego was a powerful being, and could potentially become even stronger now that he was freed from his prison in the dungeon where he was sealed, Chaos felt with the responsibility of defeating him, as he was the one that ended entering the dungeon and accidentally unsealing him…
So now, even when he realized he had gone outside the frog at long last for some strange motive, he just wanted to catch the Forbidden One's Ego and then deal with everything else.
Check "The Protagnist's Sister Is Actually the Strongest"!