Board Thread:Lore Discussion/@comment-5632187-20130119213241/@comment-16047389-20130821144432

Considering Seathe's involvement with helping her father overthrow the Everlasting Dragons, I'd say there would have been plenty of oppurtunity to meet. And there wouldn't necessarily have to be a romantic relationship between the two. You can't think of Seathe as a regular person in this regard. Now this is all major speculation, but perhaps in Seathe's desperation to find immortality, he believed that by concieving a child there would be a chance of it developing scales of immortality of it's own. With a living specimen on hand, his research would've been greatly bolstered. But as you said, their biologies are different, thus Priscilla was only a half-breed, and didn't develop the scales that Seathe needed. Being of no real use to him, Seathe abandons her as he never would have truly cared about her. Or maybe the exact opposite. Maybe Seathe saw her as a useful subject, but that she was taken away from him.

As for why and how she came to the painted world, I don't know. But two things cannot be denied. 1) Priscilla's home, the painted world, hangs inside Anor Londo protected for generatons by the painting guardians. 2)Priscilla is most certainly half-dragon, and Seathe is the only living dragon (barring the Stone Dragon) remaining.