Talk:Wukong/@comment-5877442-20160413164518/@comment-24057740-20160629143537

Flat Armor pen, is (against popular believe) better against an enemy that doesn't built armor, so doesn't counter if your enemy builts armor (BC and your Q does this) it is strong against soft targets, and targets that buy manly health as defensive stat (mages).

Armor pen get's better if you get closer to zero. Reducing someones armor from 100 to 80 will get you a dmg increase from 50% dmg to 55,6% dmg. If you reduce someones armor from 20 to 0 you increase your dmg from 83,3% to 100%.

It also works best if you stack it with % armor pen or % reduction like BC and Wukongs Q for example ;)

Armor pen doesn't help you with farming at all, but if you plan on buying ghostblade at some point and black cleaver, armor pen runes will scale better into mid and lategame then AD.