I'd like to see an actual boss rush mode implemented into the game. Lunar Shadow Memories could come back as a DLC add-on which adds harder versions of each boss fight (i.e Grialdyn EX) in a sort of Extra Mode which is a harder version of the main game with Ignis as the main character. The final boss would be Castle Master Serenity (who uses Muscle Doctor's A.I, Ballo's A.I and Misery's A.I in that order) who has 3 phases.

The Boss Rush mode in question ought to be like Kirby's Arena/True Arena. Boss Rush I pits you against all story mode bosses, Boss Rush II pits you against the optional bosses and the True Final Boss and Boss Rush III pits you against all the EX Bosses and Castle Master Serenity. Boss Rush EX pits you against all the bosses with a new challenger at the end.

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