This is my favourite build as Sion, i win almost every ranked when i solo top with this build. My stats are always something like 20/2.

If they dont have strong ap champions replace guicksilver sash and banshee with 2x bloothirster.

U need to get every minion possible in order to success, farm till lvl 11-16 depending on how many kills u have scored. when u hit like 200 minions with few kills that is enough andu can start helping u team out, ignore them till then if possible.

U wont need ur teams help much, u can easily pwn 1v3 - 1v4, Sions ulti is just so op.

Get red and do some jungling if u got spare time.

Sions ulti is the best ulti in thw whole game imo. Just pop it out in every fight, cd isn't that long.

Easier to say cons that counting all the pros.

- If enemy team has many stunns u're ****ed till u get quicksilver sash.
- Melee

Just try it out.. u wont be dissapointed. U can carry ur team victory for almost every game even if they have feeded a little.