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I take armor pen to try and eliminate and starting armor value champions start with for early damage and it also helps with late game with taking down tanks. The cool down reduction is because of the large cool down on Valkyrie and also allows you to use your phosphorus bomb and ultimate more frequently. The attack speed seals are just for a minor attack speed boost for more early game. Corki very much lacks with attack speed and before you get your ult his auto attacks can be very effective with his passive.