Yes, the untapped power that lies within you. Now, child, it's time you awakened that power and realized your full potential.
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Ultimate Argument (究極の異説 Kyūkyoku no Isetsu ) is one of Zexion's weapons in Kingdom Hearts 358/2 Days, and happens to be his most powerful weapon. To wield the Ultimate Argument, Zexion must have the Pandora Gear attached.