Are you talking about the Fell Arms? They aren't necessary to beat the game (or even needed for an achievement), but if you gather them up and fight the final boss, you'll face a third form that you can't otherwise unlock. Defeating it activates the weapons, which are the most powerful in the game. I wrote the walkthrough for that game. Check out this link for a full rundown of where to get the Fell Arms: http://www.mahalo.com/Tales_of_vesperia_walkthrough
Source(s):
Playing the unholy crap out of that game.


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