Karthus Build Guide by Krit24
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The thing about karthus support is his ult when your gonna have a clash 5 v 5 style get in the middle of them die or not die press ult if you die 100% of your ult hitting except for some champions skills or items anyway this will work i tryed and i got a lot of assist and as a support i carried the game for some reason... a support carry hmmm pretty normal anyway ult and get assist :3