Board Thread:Lore Discussion/@comment-5613590-20130307055621/@comment-4511886-20130609135326

This is how I think it is.

Priscilla is the daughter of Seath, who (for whatever reason) reproduced with a god.

Seath's albino gene was the reason that he didn't grow any scales. This gene did NOT pass down to Priscilla and thus she develops both scales and fur.

The combination of god and dragon was the reason that she developed her lifehunt ability that caused her to be bansihed from Anor Londo.

I think she also is the creator of sorcery. Seath is the grandfather of sorcery. And Priscilla is the only dragon that we know of that uses sorcery (her "fairy dust") and she may, for some reason, have shared this knowledge with X amount of humans, just like how Quelana did with pyromancy.

All of it is speculation, of course.