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ok. it uses charisma for that, because the game is based off of DnD, and in DnD Charisma is needed to be a good magic wielder. Secondly, Charisma is your negotiating skills and your tool to manipulate things to do your bidding. Therefore, you are, (in a matter of speaking), persuading the force into letting you use a power that is otherwise harder for you to use. you are getting past the rules through means of negotiation, persuasion, and manipulation of the rules themselves.
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