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.
Alright, this is an AP based Cho'gath. I have played this Cho many times, and it works like a charm. He is a killer that is not easily killed because of his innate massive amounts of health. Give it a shot, if you play it right, you will not be disappointed. Anything you would like to know, just ask.