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.
If you are fighting vs AP champ you can get and Wit's End
If you are fighting vs champ with Armor you can get and The Black Cleaver
When you get the Mardred's Bloodrazor, Stark's Fevor adn Guardian Angel you can go and get the buf from Baron Nashor you can do it alone first place one Jack in the Box on the way in after that insert one close to Baron Nashor start your Ultimate and beat him!