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.
Sion is a decent champion on his own but following this i found how a great way to play him.
Follow the items all the way and if you want experiment with the build its O.K.
like if you want to substitute Black Cleaver for Bloodthirster its alright you will lose some damage but you will make it back by the lifesteal and damage stacks per kill(works on minions and monsters to)If your not a big fan of Frozen Mallet(i dont know why u wouldnt the slow effect is amazing)you can sub it for Infinity Edge you will lose the health and slow but gain more damage/crit chance and your crits deal 250% instead of 200% now.