Not Updated For Current Season
This is geared to a right click and win type of build. Basically start off with enrage and just last hit everything in sight thanks to your masteries giving you an extra 7 damage against minions. Save up for your wriggles and at level 6 after you have wriggles and your ultimate go dragon. This gives you a great start because now all you have to do is sit in your lane and tank minions. The proc off of wrigges will gain you around 100 hp when it procs so dont be afraid to take a little dmg.
My skill build might be a little wierd to some people due to the fact i only get 1 level of my stun. If you are asking why it is because it will only stun for 2 seconds no matter the rank. Having your shield comes in handy for 2v1 fights or even big team fights where you can pop your ultimate and shield and just hammer every1. This is my first build so im not completly sure what im supposed to put in here but just follow my build and you will be fine. Just remember one thing about this build, dont turn back unless theres a tower, you will beast them! If you dont believe me i'll see if i can get another vid of me 3v1ing a nasus garen and kat. and still had full hp by the time it was over
Heres what a properly build sion can do. (Note: This game went for a while so i swapped my sword of a divine for another Phantom Dancer)