Griffin

The griffin, (or griffon, or gryphon) is, according to the lore is a legendary creature with the body, tail, and back legs of a lion; the head and wings of an eagle; and an eagle's talons as its front feet. Because the lion was traditionally considered the king of the beasts and the eagle the king of birds, the griffin was thought to be an especially powerful and majestic creature.

Not much known about this creature. To date, Sam] and Dean have never encountered an actual griffin. However, there are some clue that this creature is exist. Gadreel stated that its feathers, along with a bone of fairy is a part of the ingredients to performed the Horn of Gabriel Sigil to lured any angels to join Metatron's Army. Ian also have its feathers, and sold it secretly in his herbal remedies store.

It's unknown if the creature is closely related to the celestial beings like Angels.

Appearance

 * Season 9
 * Meta Fiction (highly mentioned in this episode)