A sylph, also called sylphid, is a mythological elemental of the air. The term originates in the 16th century works of Paracelsus, who describes sylphs as invisible beings of the air, his elementals of air. As an air elemental, the Sylph's domain is the skies, wind, the air and all it encompasses.
Sometimes they are depicted as cloud beings, and are also believed to be responsible for the myths of angels, the winged protectors of the Garden of Eden and Heaven. Their attitudes embody the extremes of nature, mercurial and intense. Most of all, they defend the high peaks and wilderness mountains that are their home.
Sylphs care little for the machinations and politics of "ground folk", and they rarely interfere with changeling society. Like trolls, sylphs hold their word of honor to be inviolate, and once sworn to protect something, they will defend it to (or even past) their death.
Sylphs resemble tall, lithe humans but with one exception. Sprouting from their backs are a pair of huge feathered wings. These wings are almost 2 body-lengths long, but fold up behind the sylph when they are on the ground. Their eyes are large and shaped like a hawk's, and their faces are sharp and angular.