Talk:Zed/@comment-5557556-20150423095708/@comment-6281696-20150424162152

% Armor penetration is roughly as effective regardless of being squishy do to the nonlineair way armor scales and the relative small difference between the highest viable and lowest possible armor being only a factor 3 in most cases with a full build. Eventually % armor pentration limits on adding 1% of effective damage per % of penetration. Unless you're going to compare say a champion with no bonus armor with someone with 6 thornmail the difference will most likely not be too impressive.

On top of that the ease with which you can get flat penetration in combination with flat penetration negates any drawback it has against squishies really.

Anyway, you're missing the point. I don't care in the slightest if zed needs this, that's a moot point to discuss anyway as long as there are other characters with equally excessive damage. I'm claiming that 40% penetration, or even higher, is in general a very bad idea unless it comes with some massive drawbacks because it ruins the notion of defense. You're simply ignoring rather an extreme amount of someone's defense. And in lol there really aren't much drawbacks to any items, outside of maybe the support items since if those don't come with drawbacks everyone starts picking them up like what happened with the old bulwark a while back...

As for 100% penetration being viable against squishies, I meant that it is viably possible to make a build that effectivly has a 100% penetration against "squishies" by taking the following:

BC: 25% penetration Last Whisper: 35% penetration Penetration mastery: 6% penetration total remaining armor: .75*0.65*0.96 = 0.468

Flat penetration: BC: 10 Youmu's: 20 penetration runes: 19 Total flat penetration: 49

Assuming this 49 is equal to the remaining 46.8% armor you'd have a total of about 105 armor. Hence against anyone with that amount you're now dealing true damage (and in the case of lower, you even get bonus damage). Hence my claim that you can quite viable reach a 100% penetration against squishier targets.