This Ssi-ruuvi technology allowed them to drain off the life-essence of a living being and store it in unusual batteries for powering their droid starships and other technologies. The process worked best on humans, since their connections to the Force were stronger. The subject was injected with a magnetic solution which was absorbed into the nervous system, and an external circuit was attuned to the internal magnetization of the subject. This "catchment arc" then collected the life-energy of the subject and placed it in batteries. The subject almost always died after the entechment was complete.