A Jedi Shadow's duty was to seek out and destroy any sign of the Sith. If Jedi Guardians were the protectors of the Jedi Order, the Shadows were the secret police. They were trained to use the light and the dark side of the force. The Jedi Shadow were thought to be gone after the Great Jedi Purge, but have been reforming on Talus under Jedi Master Xanderr."To defeat thy enemy, One must know thy enemy"