An Atmosphere Crystalizer, name hypothetical, was a device used in an interplanetary war in ancient times and in another galaxy. It was used by a robotic spacecraft to turn the atmosphere of an enemy planet into crystal. Supergirl was able to tunnel through the crystal, finding a preserved flower she needed. She was attacked by the robotic ship, still operating. She destroyed its robotic crew and then flipped a switch, reverting the atmosphere to a gaseous form. ("The Death of Luthor!")