Talk:Magic penetration/@comment-26069915-20150203001315

Nimaniel: You're wrong. In season 2, flat pen is applied before % pen. That's why magic pen quints and blues, or a haunting guise were basically useless late game once you got your void staff, because so much of the benefit of flat pen would be lost since the 40% void was calculated after. (Easy to do the math on that).

In season 3+, they reworked it so that % pen was calculated BEFORE Flat pen. That's one reason why Xerath became absurdly overpowered, since he would get 67% pen from void staff+ Locus of power (multiplicative), and then all the flat pen afterwards. So yes the wiki is current: You get the most benefit by combining % with all sources of flat. However the chart is wrong: it says "41%" pen is the max. That's additive, but it's actually 39%, because its multiplicative. So 35% from void and 6% from masteries comes out to 39%, NOT 41%. (the same way old Xerath had 67% when you took 35% from void and 40% from W).

To whoever made the Pen chart: That chart needs to be upgraded with more graphs. Void + sorcs+ 8.7 pen should be on the graph (since everyone and their momma gets void+sorc and pen reds anyway), also other combinations like Void+Pen quints+reds should be there, also. Basically only the extreme cases are there (Pen quints+blues+reds+void+guise, quints+blues+reds, etc)...