A lucky buyer now knows the power of the dark side, having become the owner of a lightsaber used by Darth Vader in the Star Wars films The Empire Strikes Back and Return of the Jedi. The iconic Star Wars prop was sold at an auction on Thursday, fetching more than US$3.6 million.It had been estimated that the iconic movie prop would sell for between $1 million and $3 million, according to the auction website Propstore, where interested buyers could place their bids.There were 31 bids in total for Darth Vader's lightsaber, and the winning one was placed at $3,654,000.