The Battle of Yin was an engagement of the Great Liberation. The Golden Empire successfully defended Yin from invasion by the Tetrarchy of Mezlagob, though at great cost. Tasked with protecting critical Royal systems, Keltrayu volunteered to lead the defense of Yin while Rin and Tariun Sakaros prepared defenses for other systems and arranged evacuations. Having been thwarted once before at Yin, all three leaders expected the Tetrarchy would try again with the momentum of Hudrel and Tershin behind them. Commanding from aboard the Star Destroyer Assassin, Keltrayu arrived only a day before the Tetrarchy fleet.