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.
Use Defensive Curl then Puncturing Taunt after Powerball to quick select one target to destroy. Use Tremors when trying to knock down a strong player after the Defensive Curl Puncturing Taunt combo if needed. Tanking becomes really easy at level 18 with full build, but you can't tank 5 champions at once so be careful. Now remember, the best offense is the best defense. Lol have fun. And sorry about description, I'm not the best guider and describer.