The librarian placed a hoof against her chin after she heard her friends request. She thought ever so deeply about it which books could have involved them. "Well, I do happen to have a series of books about vamponies... What were they called again?" she mumbled loud enough to be heard by Rarity. She made her way over to a bookshelf on the other side of the room. Twilight looked at all the books and mumbled in herself once again. "It's on the tip of my tongue!" she muttered.