Why Sion you might ask?

His strengths are his high tankiness, CC and harass potential through his low-cost E. Don't worry about W's passive getting wasted as Sion still has high HP even without farming creeps, getting creeps through runic shield/targon/face of the mountain helps.

Pros
- Super tanky
- High CC
- Low-cost harassment through E
- Effective roam ganks with ult
- Can fill roles depending on team lineup

Cons
- No sustain
- Passive state is easily kited by enemy support.
- E pushes creeps away from ADR
- Ult can easily be dodged

Sion benefits from being tanky, and his W shield scales with HP which also helps in this case.

0/9/21

A support Sion has the ability to be effective at a distance during laning. Throwing out E as much as possible with the help from mana regen and cdr from the utility tree. HP boost from the defense tree helps W.

Contrary to lane/jungle Sion, you should max E for lane harassment, W second for HP and shield and lastly Q just for the extra slow or knock-up.

(Laning)
When using E, remember to always try to hit enemy with minion-projectile since it deals MORE dmg than being hit with the skill directly, this is easy to do since enemy ADR always try to farm behind creeps. Also E has a fixed 20% ARMOR REDUCTION at all ranks that help your ADR easily deal more dmg if he decides to follow-up your harass.

If E hits, you may follow-up by walking up to the slowed enemy ADR with W up (to prevent any retaliation dmg from the enemy support) and cast Q in advance. In most cases, ADR will try to get away/dash because of the armor reduction. If enemy ADR has dash, you can either time it to release it early before he dashes. Either way is still a win since he can get zoned away from creeps or take more dmg. If enemy health is low, you can also follow-up with your ult for the kill, just make sure that the enemy support is not in the way.

While in lane, use your ult at close range as much as possible to avoid getting dodged.

Passive state can either go both ways, it can still deal a decent amount of dmg but is more easily kited by enemy support's CCs.

(Team Fights)
Support Sion can fill roles depending on the team lineup, he can act as an initiatior, follow-up initiator or stay with his ADR and peel. If you decide to initiate, be mindful of your carries' position so they can easily follow-up. You can start with your ult while W is up, as soon as it hits, cast E then channel your Q into the enemy team to disrupt their positioning.

When peeling, start with your E to slow and reduce the armor of the incoming enemy, channel Q into the direction of your ADR so that the enemy will either try to dodge its AoE or get hit with it. You can also use your ult to hard peel, remember that his ult knocks the enemy TOWARD Sion, try to ult behind the enemy champion at close range to knock it away from your ADR.