[Source] Jedi Master Kol Skywalker built his lightsaber prior to the failure of the Ossus Project in 127 ABY. Skywalker wielded it in combat against Darth Nihl and the rest of the Sith strike force that attacked Ossus in 130 ABY. It was lost after Skywalker's death and later discovered by Yuuzhan Vong Master Shaper Nei Rin amongst the ruins.