Talk:Olaf/@comment-4383947-20111107212946/@comment-94.236.228.182-20111108091437

No that's just stupid not only the passive armor pen increases and the dmg reduction but the mana cost gets LOWER so you may still use it even if you spam undertow. And you actually gain more sustain dmg from +10 armor pen then you do from 1lvl up on one of his skills