Quote:
Originally Posted by Ottriman
So maybe he can use it 1/10 of the time, give or take.
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If you suspect it will be available roughly 1/10th of the time, that is approximately equivalent to a "6 or less" frequency modifier, and can be costed that way. Make sure to scale it relative to other frequency modifiers on that power: if the base value is for "9 or less", that's different than if the base value is for "all the time".