Star Wars X-Wing: Shadow Caster - Rules of Play says:

The signature starship of the young and ambitious bounty hunter Ketsu Onyo, the Shadow Caster was agile and powerful, but lightly shielded, trading  shielding for speed. With the ship and its pilot make their way into the game , along with three other pilots and twelve upgrades that afford you myriad options for outfitting your Shadow Caster with different crew and illicit upgrade combinations. Finally, the ship boasts a mobile firing arc, which offers some of the advantages of a turret!