300 years after the death of Tulak Hord, the Sith Lord Ergast tried to recreate the ritual that the Dark Lord used to devour the spirits of his enemies at Yn and Chabosh. Instead, he discovered a ritual that he would call Force-walking.
Requiring great strength of will, a Sith could bind the restless ghosts of dead Sith to himself. Once bound, the user may draw from the ghost's power, channeling it into a powerful exertion of Force energy. Binding an unwilling ghost allows the user to draw more power while taking a willing one does the opposite. All who have mastered this technique rose to prominence quickly, but then mysteriously faded from glory, with no clue as to why. The only Sith Lord who bound more than one ghost was Lord Ergast himself, whose death also appears to be a mystery. It appears, however, that binding too many ghosts can quickly overwhelm the host inflicting physical and spiritual sickness and leads to violent expressions of Force power beyond the Sith's control. However, if the user can find the cure which was said to be found on Belsavis and Voss, the user of this ritual overcomes the side effects and can bind more ghosts if necessary.
- Star Wars: The Old Republic (First appearance)