Imperial hunters were long-range intercept starships developed by the Dark Empire during the reign of Palpatine's clones on Byss.
One such ship, Scourge One, carried Executor Sedriss QL, Vill Goir, and a group of Force-enhanced stormtroopers to the ancient Jedi planet of Ossus, in an effort to capture Luke Skywalker for Palpatine.
Several Imperial Hunters would later return to the planet to capture Ysanna shamans for cloning experiments aimed at providing Palpatine with a better genetic stock.
- The Complete Star Wars Encyclopedia