this Super-class Star Destroyer was assigned to Moff Ardus Kaine. In the wake of the Battle of Endor, Moff Kaine held the Pentastar Talks aboard this ship, eventually muscling business and political figures into agreeing to the formation of the Pentastar Alignment Treaty. He used it to patrol the Pentastar Alignment about three years after the Battle of Endor. After Kaine was killed during Operation Shadow Hand, the Reaper was absorbed into Admiral Pellaeon's fleet.
Star Wars Adventure Journal, Number 3, by Peter Schweighofer (Ed.), copyright August 1994, from West End Games