Talk:Kayle/@comment-4612150-20120409073122/@comment-2124153-20120411171109

Carries carry because of triple multiplicative scaling, i.e. AS + AD + crit with Armor penetration.

You can't stack Armor to protect against a carry. The average lategame DPS has 60-70% crit chance, 260% crit damage, 46% Armor penetration, and 300+ AD. All that you can build defensively is HP and Armor (which gets half effect because of penetration), and lowering attack speed with items/abilities. There is no such thing as reducing crit chance, or reducing crit damage, or reducing armor penetration.

The same is not the case for on-hit. And it's because on-hit attacks from Wit's End etc can't crit. That allows defense to keep up with offensive scaling, which is why it falls off late game when 42 damage from Wit's doesn't really do much anymore to that guy with 2500 HP and 100 MR.