The Ancient Sith Runestone represents a historical artifact of the Sith, discovered by the Jedi Order in the time of the High Republic Era. Jedi Master Sylwin, accompanied by her Padawan Ady Sun'Zee, transported this artifact to the Jedi temple situated on the planet Batuu. At that location, the Sith Runestone exerted its corrupting influence, setting the Jedi against each other, with Sun'Zee emerging as the sole survivor of the incident.