User blog comment:Tommy,Klaus&Kol2012+/Theory about Origin of Vampires(Comment if you have idea)/@comment-5057882-20120528164408

Ok, in "The Mortal Instruments", i read that:

An ancient demon was at war with another, and so to create an army, he began to change humans into imortals who were strong, beautiful to atract prey, but most importantly:Deadly.

Then, the other demon got the same idea, and he turned several humans into wolves, and then, when the war ended, the wolves were bound by the moon, and the vampires by the sun.

I don't think it applys to SM's story, though