The TIE Advanced x1 was an advanced prototype starfighter as a replacement for the standard TIE Fighter, tested by Darth Vader himself. Its Weaponry includes two laser cannons and a Cluster Missile Launcher that was capable of launching twenty missiles. The TIE Advanced x1 was also equipped with a hyperdrive.
The TIE Advanced x1 featured a custom-designed spaceframe and a reinforced durasteel-alloy hull, with an elongated rear deck and matching bent wings covered with solar panels. The Vessel mounted a Sienar Fleet Systems I-S3a solar ionization reactor and paired SFS P-s5.6 twin ion engines for a far more powerful drive system than that of a standard TIE Fighter. Speed was only slightly improved over earlier models, due to the added mass and to the fact that a good deal of extra power was bled off to the shield generators. The TIE Advanced x1 was less maneuverable than standard TIE Fighters, but it could take far more punishment.
The TIE Advanced x1 sported twin heavy laser cannons in a fixed, front mounted position. In a major exception to standard Imperial military policy, the TIE Advanced x1 featured shield generators and a modest hyperdrive sufficient for the ship to travel without the need for a carrier. The TIE Advanced x1 lacked a life support system, and the pilot had to wear a fully contained flight suit with an internal oxygen supply. Pilots were strapped into an adjustable shock couch with foot yokes and a hand control panel.
The TIE Advanced x1 was initially produced in only very modest numbers. Darth Vader received one of the vessels for his personal missions; most of the other ships were deployed to elite Imperial squadrons for field testing.
Vader employed his x1 during his attack on Phoenix Squadron, and decimated the force despite being outnumbered. However, he was prevented from pursuing the rebels and finishing his attack when the Ghost crew led him into a trap that saw his ship restrained by a tractor beam from a Star Destroyer. Afterwards, Vader would use the x1 to travel to Malachor.