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.
Build when the most opposite champions are physical dammage. You need to play Malphite only Armor (or Magic Resist if the opposite champions are mage) When a Champion attacked you, you need to activated 'Brutal Strikes', your Granit Armor are more Resistant.
If the opposite champions are all mage, I will do another Build on an other Page for Malphite.