A lightsaber used by Darth Vader in the Star Wars films The Empire Strikes Back and Return of the Jedi sold on Thursday for nearly US$5 million in an auction. The lightsaber, which was used in the climactic duel in Cloud City where Vader tells Luke Skywalker “I am your father”, sold for US$4.875 million at the Ultimate Star Wars Auction held by Heritage Auctions in London, Britain.