The Reaper was an Super-class Star Dreadnought

Super-class Star Destroyer Starship Starship Models

in service to the Galactic Empire and a number of its successor states. Once the flagship of Scourge Squadron under Grand Moff Ardus Kaine, the Reaper became the centerpiece of Kaine's effort to continue Imperial rule after the death of Emperor Palpatine

Palpatine (Human) Character Major Characters

at the Battle of Endor. Kaine saw the formation of a new alliance, the Pentastar Alignment, aboard the Reaper, and the ship became a major part of the Alignment's naval power.
Kaine, however, died in Operation Shadow Hand serving the reborn Palpatine, and the Alignment and Reaper were taken in by Admiral Gilad Pellaeon of the Imperial Remnant. Pellaeon made the Reaper his own personal command and, with it, conducted a campaign against the New Republic, culminating in a major victory against General Wedge Antilles

Wedge Antilles (Human) Character Major Characters

, the Super-class Star Dreadnought Lusankya, and Rogue Squadron

Rogue Squadron Organization Rebel Alliance Navy

at the Battle of Orinda. Within a year, however, Pellaeon and the Reaper were bogged down in a bombardment of the New Republic planet Adumar when the New Republic invaded the heart of Imperial space. Pellaeon moved against them, and though he was able to hold the New Republic forces back, the Reaper was destroyed at the Battle of Celanon.