User blog comment:Willbachbakal/(Item Concept) Revamping Life Steal/@comment-24385282-20150827023542/@comment-24385282-20150829011156

As far as Riven changes go, what do you propose? An update, rework, scaling changes, base changes? Presumably an overall damage decrease but Riven is at least at a fairly balanced state, so I don't think a simple damage nerf would be the best way to go about it. Personally, I can't really say I'm a fan of a concept which is at least partially balanced around something that isn't currently in effect in the game, so I think any specific changes you think would be required for champions to make this item rework work should be stated in the rework somewhere, like the champions changes you listed for the crit rework.

Aside from all this, I must say I like these changes overall. It's certainly no fun when even after you have BotRK and BT that you're taking more damage than you're healing (and dealing) from an armor tank with Thornmail from your own basic attacks alone, but this would certainly fix that, and make the Lifesteal items a little less boring as well.