Octuptarra Droid
this unusual combat droid was developed by the Confederacy of Independent Systems during the height of the Clone Wars. The body of the Octuptarra was a large sphere that sat atop rod-shaped body. From the midpoint of the rod sprouted four laser cannons. The entire droid walked along upright on three crab-like, segmented legs, with a total height of 3.6 meters. Swarms of these droids served as the advanced ground forces for the Separatists during the First Battle of Coruscant. Many of these towering, three-armed droids were also deployed to the planet Mygeeto, where they protected Separatist strongholds against attack. It was discovered that the octuptarra droid - also referred to as the tri-droid, because of its three-legged form - was best deployed at a distance, since the weaponry of the droid could not be targetted fast enough in close quarters. Because of this, a smaller, battle-droid-sized octuptarra was developed by the Techno Union, which was then armed with a chain-fed cannon that obtained its ammunition from a storage cell in the upper sphere. These droids were named for the octuptarra, an unusual creature native to the planet Skako. They were also sometimes called virus droids, as it was the octuptarra droid that delivered a clone-specific virus into battle early in the Clone Wars, in an attempt to use biological weapons against the Grand Army of the Republic.