The Ssi-ruuvi invasions were a series of incursions into the known galaxy and the Chiss Ascendancy by the Ssi-ruuvi Imperium between 1 BBY to 28 ABY. The Imperium sought to expand its territory beyond the Ssi-ruuk Star Cluster into the surrounding space due to the dwindling resources in their region. The saurian Ssi-ruuk powered and controlled their technology through a process called entechment; a means of electronically transferring the life-energy of a person into a power source for a mechanical construct.