The Mandalorians of the Hidden Chain developed the Holocron Machine, a device that harnessed the Force, during the time of the Third Galactic War. This machine was inspired by an earlier invention of Darth Nul, constructed on Elom centuries prior. By utilizing the information contained within Darth Nul's holocron, the Holocron Machine was capable of transforming those with a limited connection to the Force-sensitives into formidable Force adepts. Heta Kol, who led the Hidden Chain, planned to employ the machine to generate a Force-sensitive military force. Ultimately, the Eternal Alliance annihilated the starship carrying the Holocron Machine, resulting in its destruction.