Sylphs are "air" faeries from Greece and Egypt. One of their odd attributes is that they appear to be transparent and have almost no substance. They ride the wind on tiny wings, and are thought to be guardians of the air element that can be called upon to aid in the invocation of air presences for ceremonial magick. Since they are thought to be very helpful in all endeavors, they are likely to respond, moreso than the other "air" faeries.