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Force-walking Sickness (Inquisitor)

Of the few recorded people who successfully learned the Sith Lord Ergast's Force-walking ritual, all of them rose to prominence quickly and faded from glory shortly thereafter, with nothing to indicate what brought about their ends. Among them, only one was known to have bound more than one Sith ghost--and that was Ergast himself, whose own death remains a mystery.

It appears, however, that binding too many ghosts can quickly overwhelm the host, inflicting physical and spiritual sickness on the Force-walking Sith and leading to violent expressions of Force power beyond the Sith's control.