This Star Destroyer group, a powerful naval unit, participated in "shock treatment" missions targeting rebellious areas inside the Galactic Empire.
Following the rise of the initial Moff in the Trans-Nebular sector as a self-declared military leader, the Empire dispatched a specialized naval force to eliminate his power. Despite his declarations of loyalty and adherence to Imperial law, the Moff, along with his governing officials, were apprehended by a unit of stormtroopers, swiftly judged, and executed on the very same day.
Because the Empire had other territories requiring similar action, most of the naval task force redeployed, leaving a smaller contingent behind. This remaining force served as the foundation for a newly established sector fleet, overseen by a new Moff, Nebin Cray, who was assigned to govern the sector.