IMO, how to fix sion.
As we all know, Sion is an amazingly strong champ, being probably the best split pushers in game along trynd and camille, while also being able to build full ad and still be tanky with this W's passive, which is similar to nasus and veigar's mechanics, except with health instead of AD or AP. This ultimately makes him ahead of everyone, even if he's behind. Doesn't matter how many times you kill him, he's just gonna slowly grow and farm cs and take towers, and there is nothing you can do against it.
So, how to fix sion?
Well, being a No-Risk High-Reward champ, their must be a reason he's doing so well. And it's because everything he does, he does extremely well. He can split, 1v5, tank just about anything (including fountain turret,) cs, lane, 1v1, and even when he dies, he is hard to deal with.
Starting with his passive, we can fix this by removing the ability to proc demolish while he is in his dead enraged state (This rune is especially strong on sion because of his limitless health potential, almost one shotting towers late game.) There's other alternatives, like putting his passive on a timer like zac's or anivia's death passive, or even removing the ability to damage structures while in the dead state.
His W's passive is also way too strong, so Instead of 4 health per minion and 15 health per large minion/champ, change the max health gained numbers from 4 to 3, and 15 to 12. This will make him actually have to work to become tanky with zero tank items, and in doing so make it easier to lane against. That, or overall remove the passive, or change "max health gained" to "healing." I wouldn't mind if he had some sustain instead of massive tank potential.
Overall, I think these changed would make sion a more balanced champion, and also eradicate the "Inting Sion" strategy that no one likes to play against.
If you disagree or have better/more ideas to make sion less of a pain to deal with, put it below! I love to hear the feedback. I just want sion to be fun to play against, not a chore. [slayer-pantheon-thumbs]