I don't know. There's nothing that answers that specifically and I'm not even sure the people here have made a study of it - or if they have, I haven't located any texts on it yet. They do seem to believe the magic inherent in the witches especially seem to nourish it more - that's what the old woman was, as well.

[ She's still looking troubled by that, shaking her head. ]

Perhaps there are those in the city that know more? Or perhaps the Matriarch will share what she knows...?