The Hollis-series steward droid, also known as the C2-series, was a model of service droid available during the Cold War and Galactic War. Produced by Industrial Automaton, it was widely used in Galactic Republic space. Four of these droids were given to the Hero of Tython, the Barsen'thor, the commander of Havoc Squad, and the Voidhound, serving them with unquestioned loyalty. During the Eternal Empire's rule of the Galaxy, one of these droids was given to the Outlander's Alliance, serving the Outlander with that same unquestioned loyalty.