Sion
Now then I was unaware of the nerfs to Sion. Now i'm not going to say that this nerf should not happen, to be totally honest his lv1 E can do around 100 dmg which is a bit much.
Honestly I feel this is fine but I do ask of one thing from the Balance Team.
Perhaps lower the mana cost on Sion's E.
By how much you ask? Just by 5. Why may you ask? Because Sion isn't suppose to do damage. Which is another reason why i'm not really mad or upset about this nerf, it was bound to happen. But I feel as if a good way to still make maxing E an appealing chose to max is to lower the mana cost. 5 mana cost reduction isn't going to put him on top but i fell like when I max E I lose a bit to much mana.
In all honestly though if they don't reduce the mana by 5 no big deal, it is only 5 mana.
Riven, 
Jax, 
Lissandra, and 
Quinn. His E was what made it possible to lane against these champs ( at least in my opinion ) and a slightly lower cost would help him in 1v1s so that he's not completely out of mana by the end of his trades. Again, sion did need a nerf, but what he got was a little bit much and a 5 mana reduction on E would be good. On a side note, people who think sion is OP or needs a nerf, play him a bit and learn how hard it is to use his abilities right! Its f*kcing HARD, and there is a lot of counter play to them. Maybe you just aren't as good as you THINK you are.