[{quoted}](name=Angry Bards,realm=NA,application-id=3ErqAdtq,discussion-id=ANXPOowA,comment-id=000100000000,timestamp=2015-12-14T22:08:08.899+0000)
well, no, but the general idea would be that if you get low but don't want to back, you can go clear a wave or a few camps, heal some of your HP back up and you can be good-ish to go
maybe it grants a mini-warmog's passive when fully stacked? idk, there's not much for just a flat health gain outside of people who scale directly with health
at this point in the game this would be outshadowed by other sustain mechanics. and the lane phase is done already.
if they really want to improve this mastery, then make the % health heal trigger when an enemy champion in range dies.