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.
Since Mobafire hasnt updated their items for some reason i cant add the Manamune to the list of items but that is your fifth item and you get it after your Stark's.This build allows you to hit ridiculous damage really fast while being able to not run out of mana for your abilities. But the basic way to play this build is to lane with somebody that can help you push and get as many minion kills as you possibly can. This sion build can allow you to three hit squishy's late game and take on the 3v1 when you pop your ult.
Also you can interchange the Madred's for the Infinity Edge depending on what your fighting and if they are using alot of tanks with high hp and armor.
In short it can make kids mad.