Precision, Slot 2, Legend: Force

PASSIVE: Gain (X per stack) Lethality and (Y per stack) magic penetration, up to XX and YY at 10 stacks.

X and Y, are for Riot to determine through balance testing

Legend stacks are accumulated the same as all of the other Legend runes for this slot.

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Alternatively, this could ben an adaptive rune, but there aren't any other adaptive Legend runes, so I'm not sure if Riot is trying to avoid this for some reason.