Finest Fantasy 13

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 Illusion 13 (究極幻想13, Kyūkyoku Gensō 13) is Luxord's joke weapon from Kingdom Hearts 358/2 Days. They are gigantic versions of Final Fantasy XIII discs.

Ultimate Illusion is the ultimate attack of both Gilgamesh in Final Fantasy XII and Chaos in Dissidia Final Fantasy, and is a synonym for "Final Fantasy."