ZK-723S was an elite Skytrooper, a type of battle droid used by the Eternal Empire of the planet Zakuul, that was designated as the command unit for the shield bunker on the planet Alderaan that supported the Eternal Empire's Star Fortress in orbit. Around 3631 BBY, ZK-723S was destroyed by the Outlander and the Jedi Choza Raabat, who invaded the bunker and destroyed it with explosives.