User blog comment:NicknameMy/My suggested changes to Essence Reaver/@comment-1330314-20141022084355/@comment-1330314-20141028025531

What you're suggesting is a little different: healing for half of your lifesteal rather than a fixed percentage encourages lifesteal stacking, even if it would start a lot weaker than a fixed 10%. Working on single-target spells only would also not be that good, since only very few spells on AD champions are single-target. The reason why I think 10% physical vamp would work here is because it's the same percentage as Elixir of Wrath's Bloodlust passive: if healing for 10% of physical damage dealt on a super-late-game build can hold up on an elixir designed to work on AD assassins, then so can it on an item meant for AD caster-oriented sustain. Compared to BT's 20% lifesteal, it's a fairly even spread that would help differentiate between the two.