Gray Jedi are those who, though having completed the teachings of the Jedi, operate independently and outside of the Jedi Council. They are typically seen as misguided, though they have not necessarily succumbed to the dark side.
Considered "gray" by Jedi and Sith, the Voss Mystics had little to no formal training with the force. They believed themselves to be the "chosen people" of the force. The Mystics commonly have premonitions and visions of the future, often being able to avoid surprise attacks and invasions, as what happened when the Voss were attacked by a pre-flight species called the Gormak.