Talk:Zed/@comment-5557556-20150423095708/@comment-24447033-20150427011830

Like mentioned before, while the more armor built is negating more gold, the percentage of armor built is effectively increasing to an extent that penetration won't have much of an impact especially in extreme cases. Take 500 armor malphite for example, with the case of 50% armor pen, the damage reduction is 83% vs 71%, that 12% damage reduction comes with a sacrifice to your AD. Futhermore, armor pen is only effective against champions, it doesn't do very much for going against minions or monsters. Yes, while people do build a last whisper very early sometimes without any armor being bought there are 2 possible reasons I can see - they are stupid, or 2. The runes + masteries are enough to provide a sufficient amount of armor - which leads me to my next points.

Currently, armor provided from runes vs penetration provided from runes, you can easily fit more bonus armor than the amount of penetration the enemy. Honestly, I don't know where you pulled 10k health from but that is honestly not the case. For the sake of this argument I'm going to use 3k health as an example. Lets ignore all armor and calculate zed's damage with black cleaver, last whisper, and ghost blade. + 120 total AD. Using zed as an example, lets go with him having 80 AD. 200 AD total (120 bonus). His shurikens would deal 532.5 with 2 shurikens hit, add in an aa, + 200, and lets include his E +276. And now lets add his ultimate damage, + 704.25. Total damage: 1712.75. Which is not anywhere near enough to kill a tank. I've ignored runes, masteries to simplify the equation, obviously though - if we factor those in, the tanks would benfit more. Tanks usually have some form of CC as well, which assassins like zed do not have. Health is a lot more efficient than you think, and even more effective with more armor. for 50% damage reduction, health built becomes 50% more effective. So while armor penetration does decrease the effectiveness of armor per gold spent, the amount of armor granted already substantially provides a 50% bonus to health per gold spent.