Back in the day in d2 , there was a runic word 'malice) who made monsters bleed .
The damages were quite low but the main purpose was to prevent monsters to heal.
It would be a nice additional tactical stuff , i guess.
This is already(kind of) in the game in the form of “Increases Health Regeneration by -x%”. Though it is quite rare there is a high level component for amulets that decreases his by half.
Here is a list of all the items that have this mod.
I know this .But im not sure it totally prevents bosses from healing .
Health regen and adcth are two different things if I understand it correctly. Won’t stop for example Kuba’s blood pool healing.