Talk:Fiddlesticks/@comment-85.217.236.201-20121104191734/@comment-130.126.212.103-20121105014959

If they have 30 MR, then your MR reduction will bring them to 0 MR and you won't penetrate any more MR because you can't penetrate past 0. However, most players don't have 30 MR and will have more than that so magic penetration is still useful on Fiddlesticks. You'll be dealing true damage to anyone with less than 65 MR, it's just that you might not be using some of that magic pen if they don't have enough MR.