OG - 9 homing spider droid / Legends The OG - 9 homing spider droid , sometimes referred to as the spider walker or the Separatist spider droid , was a droid walker manufactured for anti - vehicular combat by the Commerce Guild before and during the Clone Wars . Characteristics . Like the Republic ' s Self - Propelled Heavy Artillery walkers , it was effective against both ground - based and airborne targets and was designed to transport a large and devastating weapon throughout the battlefield . The homing spider droid ' s round , armored body contained a volatile reactor . If the core was breached , the reactor violently exploded . The homing spider could cover wide areas of the battlefield with its four all - terrain legs . Because of its great height and extendable hydraulics , the walker could position its homing laser above its fellow droids at enemy targets or move to higher ground to blast at air vehicles . However , the legs were vulnerable to damage , and if just one hydraulic leg was disabled , the entire vehicle would crash to the ground . This was fairly easy to do because it was a slow vehicle . Despite its weaknesses , the homing spider could walk along the bottom of seabeds , fully submerged in water , as well as scale steep cliffs . The spider walker ' s chief weapon was a laser emplacement mounted atop the droid ' s round body . This circular dish fired a precision homing laser that could be maintained until the drone ' s internal power supply was finished . This sustained firepower allowed the homing spider to weaken shields , destroy armored vehicles and scythe down troop formations . An antipersonnel cannon below the walker ' s round body could be used for close - quarters combat , while a retractable ion cannon could be added to disable starships or other powerful vehicles . There were also weapon mounts that allowed other armaments to be fixed to the droid . Sensor equipment fitted into the homing spider , enabled it to target and keep track of moving enemy targets . Homing spider droids were distinguished by a number code alone and did not have developed personalities or long - term memory modules . Instead , they possessed an internal logic processor and military protocols for long - ranged missions , but the droids were often programmed to receive orders directly from a Central Control Computer . History . The homing spider droid was developed by Baktoid Armor Workshop prior to its dissolution by the Trade Federation not long after the Invasion of Naboo . During Baktoid ' s final days the company tried to sell many of its designs , and the Commerce Guild purchased several droid models , including the spider walker . Like the other combat automata deployed by the Commerce Guild , the homing spider droids were originally developed to enforce the Guild ' s laws and to ensure that its customers paid their debts , as well as to protect Guild assets . The homing spider droid first appeared during the Battle of Geonosis in the service of the Confederacy of Independent Systems , where spider droids such as unit 81 fought against the Grand Army of the Republic . During that battle , they provided protection for Trade Federation " Lucrehulk " - class core ships and annihilated whole contingents of enemy All Terrain Tactical Enforcers , although they were subdued by LAAT / i strikes . After Geonosis , homing spider droids became common staples of Confederate armies . They were used fairly extensively in the Dark Reaper Crisis early in the war , although they were often destroyed by Jedi - piloted TX - 130 " Saber " - class fighter tanks . A number of droids were used in the defense of the Commerce Guild world of Felucia , and many destroyed units remained there as late as 2 BBY . Following the execution of the Separatist Council by Darth Sidious ' s new apprentice , Darth Vader , these units were de - activated .