Chisas was a secret planet the belonged to the ancient Sith Empire. On Chisas, Sith technicians managed to develop droids that could use the Force. However, before the droids could be sent into battle against the Jedi and the Old Republic, Exar Kun was defeated at Yavin 4. With the Sith Empire shattered, Chisas was quickly lost and forgotten, surviving only as myth and legend.