This is how the skinny, black eyed aliens come about. They can no longer reproduce on their own so they have to genetically alter other species to multiply. A few generations of this and you get the full on anal probing gray aliens. Does it all make sense now?
(I'm mostly joking about this, but now that I've written these words, I'm not fully sure I am joking now. I've always struggled with what the end game could possibly be for all this shit, but this sort of feels right all of a sudden.)
you're thinking of jews, cannibalistic neanderthals who require cro magnon blood or they expire within 5 generations by cause of their secret ailment:
An early version appears in Bonum Universale de Apibus ii. 29, § 23, by Thomas of Cantimpré (a monastery near Cambray). Thomas wrote, in around 1260, "It is quite certain that the Jews of every province annually decide by lot which congregation or city is to send Christian blood to the other congregations." Thomas of Cantimpré also believed that since the time when the Jews called out to Pontius Pilate, "His blood be on us, and on our children" (Matthew 27:25), they have been afflicted with hemorrhages, a condition equated with male menstruation:36
A very learned Jew, who in our day has been converted to the (Christian) faith, informs us that one enjoying the reputation of a prophet among them, toward the close of his life, made the following prediction: 'Be assured that relief from this secret ailment, to which you are exposed, can only be obtained through Christian blood ("solo sanguine Christiano").' This suggestion was followed by the ever-blind and impious Jews, who instituted the custom of annually shedding Christian blood in every province, in order that they might recover from their malady.
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