Sith Emperor's ritual

During the Great Hyperspace War, the Sith Lord Vitiate developed a ritual that he used to consume the life force of the entire planet of Nathema, including many of the most powerful Sith Lords of the time. He would later attempt to use this ritual on a galactic scale during the Second Great Galactic War, but was stopped by the Hero of Tython.

Appearances

 * Star Wars: The Old Republic: Revan
 * Star Wars: The Old Republic