OLDONES
Old Ones
In the Buffyverse, the Old Ones are the extremely powerful, pure-breed demons that once dominated Earth before humankind appeared. Illyria is one of these demons while it's more than likely that Jasmin and her kind ascended to their higher plane because of the growing malevolence of these warring demons. It's also possible that the Powers that Be were part of the same race but shared a different philosophy than the other Old Ones.The above text is a snippet from Wikipedia: Old Ones (Buffy the Vampire Slayer)
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