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The earliest such droid was HK-01, responsible for the Great Droid Revolution on Coruscant and finally destroyed by the Jedi MasterArca Jeth. Based on his schematics Czerka Corporation produced the HK-24 model, which met little success on the market. HK-47 was constructed by Revan during the Mandalorian Wars based on the schematics of HK-24. Several years later, G0-T0 started producing HK-50 droids, in turn based on the schematics of HK-47 and designed to hunt down Jedi. The line was banned in most systems after their governments learned of the roles these droids played in the Jedi Civil War and the Sith Civil War. Battle droids resembeling the HK series were later used by the Republic during the Great Galactic war and the Cold war. One HK unit was owned by Sith MasterDarth Scabrous on Odacer-Faustin. During the time of Galactic Civil WarHK-47, who found himself stranded on Mustafar, began to produce more HK-units based on his own design.
The term HK "Hunter-Killer" was first used in Star Wars with HK-47, which in turn is a reference to the dropship of the same designation that appears in the BioWare game Shattered Steel, which in turn was a reference to BioWare writer Drew Karpyshyn's billiard team.[2]