The masteries setup in my build gives damage, armour pen., and all other mastries needed for dps champions. My runes give attack speed, attack damage, and critical damage. The skill set up provides more damage from rupture early game to not only slow your targets but injure them critically. This build is not recomended for new cho'gath players because of the skill needed to play him as u will have to hit the target dead on with rupture to slow your enemy to catch you up with them to kill.

Sorry I did not make more paragraphs explaining my build but I am in a rush to test more builds to post :P