Finest Fantasy 13

Ultimate Illusion 13 (究極幻想13) is Luxord's joke weapon from Kingdom Hearts 358/2 Days. They are gigantic discs, depicting the Nobody ensignia and the Roman numeral for 13 (XIII), a reference to Organization XIII.

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."