A more balanced existence of Grievous Wounds here.
Instead of an instant 40% healing or w/e the number is, it should be an effect which you need to stack to become effective so that you don't instantly destroy all healing the target opponent gets. Take the idea from Black Cleaver's stacking passive and turn it into something similar, like:
Every other (2nd or 3rd or 4th) autoattack a target is afflicted with (a stack of) Grievous Wounds (max stacks 10 or something along the lines).
Grievous Wounds reduces all healing received by 5% (or a figure just as low) for 2 seconds. . __ It doesn't have to exist in that exact form, all that I'm suggesting is to make it so that Grievous Wounds is a debuff that you need to stack to be effective.
are taking a one-way-ticket to shit tier.