I remember when Leech had healing reduction reduction. I think it's good for the game to leave that mechanic behind, it's an instant buy on every hero that wants it.
I do like the idea of a passive that is shared with allies when you get boons/kills, that's a nice way to enable supporting characters and teamwork in this game.
Everything else seems alright, I do like a good group-up item, although Health Nova does seem to fit this niche a bit already.
