Description from original post (created 2012-06-24 02:10):
Darth Nihilus appears in The Sith Lords and in the Star Wars: Legacy comic series. Darth Traya found and trained Nihilus; Nihilus and Darth Sion later betrayed her. He is the primary antagonist of the video game, "Knights of the Old Republic 2".
Nihilus is known as the Lord of Hunger, as his spirit was damaged by the activation of the Mass Shadow Generator super-weapon. He is drawn towards force-power, and consumes it. Eventually, Darth Nihilus abandons his own body, allowing it, too, to be consumed as he binds his soul to the armor and mask that make up his hollow physical form.