Coup De Grace Idea
Remove the extra damage on low hp targets, keep the passive that gives damage after killing an enemy, and make the passive do 9/18/27 (level 6/11/16) extra damage after killing an enemy. Or the reverse. remove the damage passive and give it 5%/10%/15% (level 6/11/16) extra damage on targets below 55% hp
Just an idea, no harm in it :)
