Vjun was a dark, smoggy, almost lifeless planet in the Vjun system. It was well known for its acid rainfalls and lack of plant life. It was the location of Bast Castle, this is where Darth Vader studied the Darkside of the Force.
The planet is only seen in Star Wars Battlefront: Elite Squadron, making it a non-canon planet.
Darth Vader's TIE Advanced x1
LA-AT Gunship/Alliance Assault Craft
Darth Vader- Empire
Obi-Wan Kenobi- Rebel Alliance
CIS- Count Dooku