Mechno - arm / Legends The mechno - arm was the custom - made prosthetic limb constructed for Anakin Skywalker after his right arm was severed by Count Dooku on Geonosis in 22 BBY . This prosthetic replacement was far stronger than the original . History . On Geonosis , Anakin ' s right arm was severed at the elbow by Dooku ' s lightsaber . Anakin survived his encounter with the Sith Lord , and returned to Coruscant to recuperate and oversee the creation of a prosthetic limb . This robotic appendage lacked the synthskin applied to some models , and had a skeletal , droid - like appearance ; it was designed to be a sturdy replacement , not a cosmetic disguise . Anakin ' s new arm connected to the remainder of his limb via a synth - net neural interface , a complicated piece of technology that allowed Anakin to register feeling in his mechno - arm . Anakin ' s metal mechno - arm was an advanced version , featuring golden , electrostatic fingertips that simulated a sense of touch . Data collected by the fingertips was transmitted through sensory impulse lines running down the fingers and into an interface module at the wrist . This module served as the junction between Anakin ' s robotic hand and living flesh . The arm ' s servos and sensors were controlled by a power cell near the thumb . The mechno - hand ' s motorized knuckles provide Anakin with a crushing strength far beyond the Human norm . During the Clone Wars , many of the Jedi Council believed that Anakin lost some of his Humanity because of his prosthetic replacement . Anakin , however , was well at ease with his mechno - arm , and tinkered with it as he did his starfighter . He added strengthened alloy ligaments and armored shielding to bulk up his spindly robotic arm , giving the appearance of a well - muscled arm to match the rest of his toned body , and covered it with a glove . During the skirmish on Nelvaan , Anakin ' s mechno - arm was destroyed after his Force Grip destroyed the crystal from the Siphon generator used to power the Separatist base on the world . He had a replacement which R2 quickly reattached to Anakin . Anakin nearly lost his mechno - arm after his fall into darkness and his transformation to Darth Vader . At the climax of his epic duel with Obi - Wan Kenobi on Mustafar , Vader lost both legs and his remaining biological arm to Kenobi ' s blade , and was left to die on a black sand bank . Darth Sidious saved him , however , and set his medical droids to work on the wounded Sith apprentice . Now known as Darth Vader , the Dark Lord was given an upgraded prosthetic arm which was heavier , but even more powerful than the last . A month later , this arm was severed by Jedi Master Tsui Choi when Vader confronted several Jedi in the Conclave on Kessel . It was replaced with another artificial arm . This arm was then severed by Starkiller ' s clone , who used his former master ' s blade on him during the Battle of Kamino in 1 BBY . Sometime after his escape from Dantooine he got it replaced again . During a battle with his son Luke Skywalker at the Temple of Pomojema on Circarpous IV , also known as Mimban , Vader lost his mechanical arm again , but it was replaced . Years later , after his many failures at defeating the Rebel Alliance , this arm would be destroyed by Darth Sidious as punishment . It was soon replaced and this arm would have its hand severed at the wrist once again by Luke .