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.
Threats to Sion with this build
|Tryndamere||pretty easy matchup, just have to build ninja tabi to resist and your cc is a pain for him.|
I am a dedicated Sion main and i am just giving a generic build of which your Sion build should like like. Generally you want to ultimate than do the rest of your combo and finish them, which is why i implicate ad damage in this build.
keep killing off minions with your q and e combo. In this way you gain cs relatively easy. At earlier levels make sure the minions have no hp. Later on it does not matter as the damage you do with your q late game is colossal to minions.