Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
This is a different type of build for kog. Now that his caustic spittle skill increases attack speed, he is a more valuable dps fighter than ap fighter. I have been using this build for the last 5 or 6 games and it has been proving to be quite good. Once you get past obtaining Wit's End, it is all down hill.