User blog comment:Deshiba/Season 3 Armor and Armor Penetration/@comment-105.236.66.41-20121110101525/@comment-4022742-20121110163102

That's very kind of you to say, it took me around 2 hours to write up and fact check, but I still made some mistakes :P

The point was that unless they plan on tweaking skills they will have champions with percentage armor reduction that reduce from 36% up to 55% of your total armor, this is a big deal no matter what your armor number is. (36% is the pretty common 15% reduction with 25% from Black Cleaver)