The Yami no kōhai is one of the most destructive, powerful and the most deadly Sentry Androids in the galaxy created by the Alpha Legion during the Galactic War that cause such damage to the Galactic Empire, whenever these Sentry Androids are spotted, they must call in either Darth Vader or Darth Sidious since the Stormtrooper's energy or plasma based weaponry has absolute no effect, and would be a ideal cover for the Rebels.