Vadau Drones are the most used form of troops in Baxitus' army of machines. They also served a variety of other positions like Guard, Warrior, Keeper, etc.
Early versions were created by Baxitus when he first arrived on the planet that was once known as Trian Magna before he renamed it after himself. Vadak later improved upon the design by rebuilding them when he first arrived on the planet. Vadak's version is the one currently used the most in the war.