According to Jamie Sams and David Carson, in their excellent book Medicine Cards (which accompanies a beautiful deck of animal cards), Raven's medicine is magic. She is the Great Mystery of the Void.
Black, to Native Americans, is a color of magical power, and only to be feared if misused. Raven symbolizes the void - the mystery of that which is not yet formed. Ravens are symbolic of the Black Hole in Space, which draws in all energy toward itself and releases it in new forms. The iridescent blue and green that can be seen in the glossy black feathers of the raven represents the constant change of forms and shapes that emerge from the vast blackness of the void. In Native American tradition, Raven is the guardian of both ceremonial magic and healing circles. She is also the patron of smoke signals.
Raven's element is air, and she is a messenger spirit, which Native American shamans use to project their magic over great distances.
