User blog comment:Takingday/Sion possible ability changes/@comment-5556439-20130802001653

The point of true damage is to be true damage so I would remove that mechanic.

The missing hp thing doesnt stack with his E because no matter what, % of Missing HP is going to a % of Missing HP, 500 out of 1000 is always going to be 50%, same with 1000 of 2000. Sion stacks extra Max HP so he gains nothing from it considering his ult is intended to keep him at as clsoe to max as possible. Just remove the HP scale because it would be broken if it scaled from Max HP period since his job is to never die, this just makes him a even bigger issue.

Replace it with "% of total Bonus HP gained" which would encompass Items, Runes, Masteries, E etc. This would reward him for building tanky instead of just straight lifesteal and AS. Making the concept behind his orignial design "Lifesteal Tank" actually doable since a BotRK is all thats needed and can build straight tank afterwards maybe some Crit.