User blog comment:MetalBiM/Sion Rework/@comment-8506165-20140316160438

I don't think the E is viable at all in its current form. As far as I can think, only one champion has a skill that works only on minions/monsters (Nunu's Q) and that gives him a fairly large amount of life back when he uses it and provides other bonuses if he uses it on jungle creeps, as well as being an active skill you can use whenever you like rather than "executes minions/monsters below X health". It is in fact a bad skill for Sion to use at all if he's good at last-hitting because it just costs him health. (That, and with the current numbers it just doesn't do anything at all once you do more than 100 damage to minions/monsters per auto-attack).

Besides that - what does this rework really give Sion that he doesn't already have if he goes AD? Granted, he has AD scaling on his stun now, but the mechanic on the shield just compensates for the loss of E (although in a somewhat weird manner - hard to say if it'd be better or worse) and the ult is just the same. The passive is better, but... that's about it. And he's lost his AD steroid, which is bad when he's someone that's meant to AA a lot.

You really need to think about what Sion's strengths and weaknesses are in terms of what his kit does and work to fix them, rather than just tweak the numbers on his current kit a bit.