Talk:Ezreal/@comment-79.197.177.99-20120502113952/@comment-2124153-20120502215458

It's true that negative Armor increases damage done, but Penetration can't reduce Armor below zero, only Reduction can. Big difference between the two stats. Last Whisper has Armor pen, Black Cleaver has Armor reduction, fyi. Not possible to itemize for reduction with runes/masteries.