Saren is a small planet within Chiss space. After the start of the Galaxial War, Trivas sent a small Nymean task force under the command of Vexen and Isa Raal. Those forces were sent to destroy the Galactic Alliance garrison there and provide a way to make it easier for the Chiss to join the Sith. The mission was a success and provided more support for the Chiss Ruling Houses to join the Sith.