Welcome to my very first build. This build is mainly concerning Attack speed, Crit and Damage for Olaf to produce maximum damage. Some say it might be a stupid build but this build originally came from a friend of mine who used this build and three hit a Tristana and Ashe in a 2v1 fight. I was amazed at the amount of crit damage is pulled off by this build and for a champion like Olaf it is a very useful build.

The runes are fairly self explanatory but i will explain why i chose them.

Greater Mark of Desolation x9 - I use these marks for more armour penetration combined with Olaf's amour penetration passive it begins to tear up, and if you ever get to finish the build, the extra armour penetration with Black Cleaver absolutely rapes.

Greater Seal of Alacrity x9 - I use these for the early AS to go with Olaf's Vicious Strikes to regenerate your HP alot quicker in early game.

Greater Glyph of Celerity x9 - I use these to reduce the cooldown on Olaf's spells. It becomes very useful when chasing down someone and your Undertow and Reckless Swing is on ccoldown.

Greater Quintessence of Alacrity x3 - I use these along with Greater Seal of Alacrity to give me the Early game AS i need to take down the enemy as quickly as possible and to also regen HP with Olaf's Vicious Strikes.

I do a 21/0/9 build for Masteries as i try and max out Attack speed and Critical Chance and damage while putting one on exhaust to allow it go for longer while putting one on Ghost and three on Good Hands so that in the chance that you do die (Being ganked 4 or 5v1) you wont have to wait as long and can return into the action alot quicker. I put the four on extra exp gain and last one for letting Neutral Minion buffs to last longer.