The Ssi-ruuk (pronounced /'si ruk/) (Second Human Empire: ?)[3], Ssi-ruu in singular form, were a saurian species that invaded from the Unknown Regions of the galaxy and initiated the Invasion of Bakura in 4 ABY, shortly after the Great Battle of Endor. This race relied on a technology called entechment that involved extracting the life-energies of sentient beings and using them as power sources for their mechanical technology. They had a sizable war fleet and ruled an empire called the Ssi-ruuvi Imperium in the Ssi-ruuk Star Cluster near the galaxy's rim. The Ssi-ruu joined the Coalition of Independent States.