Asa-Ku was a male Voss living on Voss during the Galactic War. A memeber of the Dream-walkers sub-sect of Voss Mystics, in 3641 BBY he was in the Mind Healer's grove, where he was approached by the Sith Lord Kallig, who looking for the information on the Forbidden Ritual. Asa-Ku agreed to share the secret on the condition that the Sith join the order of the dream-walkers.