Not vampires, but they need blood to get rid of satans corruption. The serpent, Satan mated with Eve, bearing Cain, and from there on the blood was corrupted.
https://en.wikipedia.org/wiki/Porphyria>If the skin is affected, blisters or itching may occur with sunlight exposure.[2]These blisters look like pic related (there are worse pictures, but i cant tell if they are really from Porphyria or not, so I keep it real). Now how is it treated? Among other stuff
https://www.healthline.com/health/porphyria>blood transfusionsRemember those bloodlible accusations against jews all the time where they supposedly snatched children to drink their blood? The vampire stories about people drinking blood and not being able to step into the sun? But there is more:
https://en.wikipedia.org/wiki/Elizabeth_B%C3%A1thory#TrialThis chick apparently tortured some virgin and when the blood of one reached her skin by accident she realized that it appeared to be rejuvenating so the only logical step was to kill even more virgins to bath in their blood to stay young. This too isnt too farfetched
https://www.scientificamerican.com/article/fountain-of-youth-young-blood-infusions-ldquo-rejuvenate-rdquo-old-mice/or this here, episode 33 of the series, 33, the masons favorite number
https://www.youtube.com/watch?v=_kO0Zowa1Toinjecting instead of drinking or bathing in it, but still the same theme.
So through that bloodlible back then, and probably even today, they tried to negate the genetic errors they recieved through the bloodline of the serpent even though through all that mixing they arent as likely as they were back then among (((them))).
You know those people arguing we dont come from this planet because of our backproblems, or that we were created artificially because we apparently arent really evolved properly for the upright walk? All caused from the errors of the seed of the serpent which corrupted Gods creation physically and spiritually
