Arbitan guarded the Conscience from the Voords, who were trying to capture it. However, he foresaw the need for the Conscience to be used and so sent several people out to fetch the four missing keys, including his daughter Sabetha, Altos and Eprin. None of them returned. Yartek, the leader of the Voords, pretended to be Arbitan by dressing in the Keeper's robe, keeping in the shadows and hiding his features beneath the hood of the garment. (TV: "The Keys of Marinus")