All type two vampires originate from purebloods, the only subtype within the species which can turn humans into their kind. The origin of these purebloods is uncertain, but it is believed that they merely began existing several millennia ago, during a time of great environmental and climatic chaos. They have no human ancestry at all. The current purebloods are linearly descended from these, and continue to have no human ancestry, while the other 2 subtypes are humans transformed by a pureblood's bite, and born vampires who do have some human ancestry, due to being partially descended from humans or from ex-human vampires.