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.
It's all thanks to my friend (IcheeZx) that this guide could be made. were it not for him showing me how OP Gangplank could be i would have given up on Gangplank
Important information: though i say that this build is OP it is still a work in progress so ill be happy if i get feedback on this.