Mimban / Legends Mimban , formally known as Circarpous V , was the home planet of the Coway , the Mimbanite s , and the extinct Thrella . Although originally named Circarpous V , the planet was never colonized by the Circarpousians . The planet , locally known as Mimban , was in the Circarpous system . Geographic features . Mimban was a cloud - covered jungle world that was largely unexplored . The atmosphere over Mimban was very turbulent . Starships without special hulls faced tremendous danger from the energy storms that streaked the stratosphere . The surface of the planet was damp , and the perpetual mist made it difficult to distinguish night from day . History . During the Clone Wars , the planet was a member of the Confederacy of Independent Systems . Early in the war , a unit of the 224th known as the Mud - Jumpers and a unit of the 44th Special Operations Division known as the Devil Dogs served on the planet and fought in the Battle of Mimban . Haka Hai had a base on the planet . It was here that he attempted to take Dreypa ' s Oubliette from the crew of the " Uhumele " . He later died when Bomo Greenbark ambushed Hara and his men after Bomo escaped captivity . With thaissen crystal s acquired from Mimban and techniques adapted from lightsaber construction , Lord Cronal gave the Force detector s the ability to magnify any Force detected , as well as sense dark - side tendencies in the Force - sensitive subject . At the time of the Battle of Yavin , Imperial control of the planet was entrusted to Captain - Supervisor Grammel , who ruled from the Imperial planetary headquarters built into an ancient towering ziggurat . The Galactic Empire used Mimban as the site for an Imperial energy mining operation . This consisted of five makeshift mining towns , all run by Imperials at the height of their operations . The legendary Kaiburr crystal was located deep in the jungle within the Temple of Pomojema . The powerful crystal rested within a ceremonial statue of the minor local god Pomojema and was guarded by a sluggish but deadly lizard creature . In 2 ABY , Luke Skywalker , Princess Leia , and the droids R2 - D2 and C - 3PO crashed on Mimban while traveling to a conference on Circarpous IV . On Mimban , Luke and Leia encountered a Force - sensitive old woman named Halla . They struck a deal with her , promising to find the Kaiburr crystal if she promised to aid them in their escape off the planet . However , Darth Vader was also looking for the powerful Kaiburr crystal . Both in pursuit of the powerful Force relic , Skywalker and Vader dueled in the ancient Temple of Pomojema . Every movement of Skywalker was guided by the spirit of Obi - Wan Kenobi and empowered by the crystal , so the young boy amazingly managed to hold Vader off , even managing to sever the Dark Lord ' s mechanical arm . Shocked , Vader tumbled down a deep pit , ending their duel . This was the first battle between Darth Vader and Luke Skywalker . After the showdown , the Rebels were able to retrieve the Kaiburr crystal and leave Mimban . The Yuuzhan Vong invaded Mimban from positions in Hutt Space after forming an alliance with the Hutt crime lords . They used the planet to attack nearby Gyndine , overrunning the neighboring world . It was rumored that the Yuuzhan Vong had occupied Mimban to allow their bio - engineered Fire Breather s to fill up on swamp gas for the invasion of Gyndine . Behind the scenes . The PC game " " mistakenly refers to the planet as " Cicarpous V . "