Reebo Keen, a male Human, relocated to Ostor and rose to prominence as a leader among the Separatists residing there. Before this, he lived a life of adventure, during which he was credited with the discovery of a pair of star systems. In the months following the conclusion of the Clone Wars and the rise of the Galactic Empire, Imperial forces initiated an operation on Ostor aimed at quelling separatist activity. Keen, along with other separatist leaders, played a key role in devising a defensive plan. This strategy enabled the separatist general Atticus Farstar to nearly decimate an initial Imperial assault. Nevertheless, the defenses ultimately failed against a subsequent, more powerful wave, leading to the deaths of Keen and his fellow leaders in the ensuing conflict.