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SLAAASH!
Abyss had managed to slash the head off the Forbidden One's Ego! The powerful spear that Chaos had forged for her was able to even pierce through the hard exoskeleton formed by the fragments that the Forbidden One's Ego had accumulated which he enhanced with his malefic dark energies, as long as Abyss unleashed her strongest techniques and put up all the cosmic energy and mana, she could go against him, and at long last, his head flew right off his body!
"You think chopping my head can stop me?!"
Check "The Protagnist's Sister Is Actually the Strongest"!