Yo!

I'm WaT30, playing on EU Nordic & East. This build primarily focuses on being team's carry, your only mission is kill, kill and kill (assists will come with your Ultimate).

Now then, let's get started!

As I mentioned earlier, you'll be the ultimate damaging force on the field, that's why you need damage and armor penetration (critical runes are totally not needed, as with this build you'll have 100 % crit chance with every crit doing 1k+ damage).

The masteries pretty much explains themself, you'll going for damage + a little defense that will help you at the beginning. No real reason for spending points on lifesteal or armor penetration as you have enough of them already.