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Kireina combined her Skills with her Divine and Cosmic Aura, coupled with the Ocean Tear Fragment and Aquamarine's powers, combining it all into a titanic demonic claw made of the frozen Chaotic Sea she just created.
CRAAAASSHH!!
And tore apart Oceanus face for daring to interrupt her when the bastard himself asked her who she was! He, clearly, cried in agony because even if he could recreate his body, Kireina could damage his soul with any attack.
SPLAAASH!
The rest of his body fell into the seas, suddenly beginning to be infected with Abyssal Chaotic Frost, beginning to slowly freeze and crumble down into pieces.
"UURGHH…! W-What the hell?! ARGHH…! M-My soul!" Oceanus kept screaming in agony. "Who is this monster?! Where he hell did she even came from?!"
Check "The Protagonist's Sister Is Actually the Strongest"!