Riot doesn't want the % to be nerfed, because then you can't feel it. This change would make the effect much more of a "Grievous Wounds while being autoed like a Void Ray", and also introduces counter play via pulling out of range, ccng the adc, without the Grievous Wounds just sticking to you to permanently cancel all heals.
HentRex4 votesStill say it should be an active item like how 
is. Or only affect champs under 40%hp like 
Spoofghoul2 votesYes this would be better, but it also applies to physical damage. Maybe it should work similar to spellvamp as in less effective on aoe damage, applies for 2/4 seconds on physical damage spells and for 1/2 seconds on auto attacks.
Man this item is just strange how it nerfs and buffs 
at the same time.
Mathbalnase1 votes2/4 seconds on single-target, single-instance physical damage spells 1/2 seconds on multi-target (/aoe) or DoT physical damage spells and on AAs
Jungle Lux God1 votesThis isn't a bad idea, but I personally feel there should be much greater gameplay around Grievous wounds than just auto attacking an enemy.
I personally feel that it should have the same duration and same effect, but only after auto attacking the target a certain amount of times.
This offers the sustain tank the counterplay of getting out of range of the ADC to get his healing back and rewards the ADC for using this item properly to deal with the enemy tanks, rather than instantly invalidating the enemy tank with the tank having no options against it.
Blinded Melon1 votesThe reason EC Is the way it is and it doesn't work like morellos is because rarely can an adc do the burst damage required to trigger the effect. Mages like LB, lux, and fizz can burst their target below %40 hp quickly, but when was the last time you saw an ashe or caitlyn do that burst?
