Ja'ce Yiaso was a Zabrak Inquisitor who was located inside the Emperor's Retreat. Serving the Empire as one of Palpatine's Inquistor followers, Ja'ce has learned the knowledge of the dark side and went on the hunt for surviving Jedi. Around 1 ABY, Luke Skywalker arrived to the planet where he encountered the dark jedi. Surprised that the young rebel was a Jedi, Ja'ce invited him to join the dark side and serve the Empire forever. Skywalker refused and engaged him in a duel. Ja'ce force choked the young Jedi and hurled him in a wall. Luke stood up with his anger and struck the Dark Jedi down. After killing him, his spirit taunted him, causing Skywalker to release his rage, but he disappeared. Luke felt sorry about himself, and quickly calms himself and leaves the planet to recruit with the