The Merciless was an Imperial-class Star Destroyer of the Imperial Navy. Early in the Galactic Civil War, on a tip from an informant, it destroyed the trading outpost Kestic Station, near the Bestine system, for running arms to the Alliance to Restore the Republic. The Merciless did not stop to ask questions or take prisoners, and all aboard were killed.
Among the dead were the parents of Zev Senesca. He originally blamed the Rebellion for their deaths and left their service, but soon came to realize that the informant was a "friend" who he had confided in. Accepting his own responsibility, he returned to fight against the Galactic Empire.