A sentinel, posted to the Arcanum, which was a space station belonging to the Sith Empire and functioned as a storage location for Sith artifacts, turned against his own Empire. This betrayal enabled the followers of the Dread Masters to pinpoint the station's location and subsequently raid it. Following this assault, the sentinel was apprehended and subjected to torture, all in an effort to uncover the schemes of Lord Tagriss, the leader of the attacking force.