Double MP on Crits?

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for PLD gaining double MP with critical hits is complety irrelevant since they don't spend they MP outside of requiem cast so they won't care, for DRK could mean a increase of edges and will be a noticeable increase of DPS, this can be hard to balance since DRK will gain way more dps across the increment of iLVL on the expansion specially with edge being a oGCD of 500p. it could be interesting but right now it wont work.