Board Thread:False Info and Speculative Discussion/@comment-4815136-20140817115322/@comment-13965604-20141015034222

108.13.253.37 wrote: Guys, this is my theory. She's a Banshee. Which in the correct Irish spelling is Bean Sidhe. Translation: Woman of the Sidhe. The Sidhe are the fairy folk of British and Irish myth, the gods and goddesses of the Celts, the source of magic itself. They are the ones the Druids pray to in order to get powers. If that is true, technically, that would make Lydia part of a race of beings that probably gave the Mountain Ash its mystical powers to begin with. Therefore it has no effect on her, or any other members of the Sidhe. That is, if the show decides to incorporate that true-to-mythology element.

Very speculative, but interesting.