Masken was a Moff in the Imperial forces, a male Human who served on the main vessel of Darth Vengean amidst the Galactic War. This conflict saw the Galactic Republic clash with the Sith Empire.
During the year 3642 BBY, Masken found himself stationed on Darth Vengean's flagship, which was then engaged in a space battle above Quesh. Their opponent was Republic Admiral Monk. When the apprentice of Darth Baras made entry to the ship, Masken jumped to the conclusion that Darth Baras was committing an act of treachery against Darth Vengean as part of a Sith power struggle, and at the cost of Imperial personnel. He divulged to the Sith Warrior that Admiral Monk, along with his key officers, had already evacuated the vessel via an escape pod headed for the planet below. The Moff, who was filled with outrage, was then killed by the Warrior, who then made their way to the planet.