Darth Anonymus, a self declared Sith lord during the years of Jedi Civil War following the fall of Darth Malak and departure of Darth Revan into the Unknown Regions of galaxy. He was a minor Dark Acolyte under Darth Malak's command and was sent to Outer Rim worlds to locate Revan, so he survived Star Forge's destruction and declared himself as one of the Dark Lord of the Siths. He was in fact not in the league of Darth Sion, Darth Nihilus or Darth Traya, so he remained in Outer Rim worlds hunting down weakened Jedi. In order to do so, he used a one of a kind Sith speeder for tracking down his enemies.
Gallery: http://www.flickr.com/photos/21569129@N04/