It doesn't need one. It's OP, besides, a quicker-super-charge perk isn't necessary for people who know how to properly play the game. You know that kills, headshots, ability kills, all net you extra super energy. Being a talented player is how you charge it faster.
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That's my point. It's not OP.
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At what part did I say anything in agreement with you?? I think you're confused..