ASP-38 Droids, also referred to as Vader Droids, served as Darth Vader's security force at Bast Castle. These droids, equipped with a repulsorlift and armed with 2 dual blaster cannons, posed a significant threat to anyone attempting to breach the Dark Lord's fortress. Even following the Sith Lord's redemption and subsequent demise during the Battle of Endor, these droids remained operational.
Sometime following the Declaration of the New Republic, X1, a former clone trooper, initiated a campaign to rebuild the Galactic Empire, positioning himself as its supreme commander. Seeking to unlock the secrets of the dark side, this self-proclaimed Sith Lord journeyed to Vader's remote and forgotten sanctuary.
X2, X1's brother and now a Jedi Knight, was dispatched to Vjun with the mission to intercept his brother. Upon his arrival, X1 had already departed. X2 encountered these droids alongside a contingent of stormtroopers. The Jedi Knight easily defeated both forces, leaving no survivors. After recovering Falon Grey's lightsaber and X1's holocron, X2 made his escape in a TIE Advanced x1, after his X-wing was destroyed under enemy fire.