I saw some comments on the internet saying that it was weakening his healing factor, but in reality it didn't have that much of an effect on him because he definitely killed himself with the stake to get rid of it in his body for good, I've been analyzing this situation and basically the original vampires They have existed for a thousand years as vampires and the dark magic that is in their bodies is very potent, why would even the Hollow's dark magic kill them? she was only 500 years older than them, this plot didn't make much sense.
