The Naddists, a Sith cult located on Onderon, revered the deceased Dark Lord Freedon Nadd. To gain the Dark Lord's approval, they constructed the Ancient Proving Grounds, where participants engaged in lethal combat as trials. A significant number of Naddists possessed the ability to wield archaic Sith magic, with King Ommin and Queen Amanoa being prime examples. Their numbers were greatly reduced after the Freedon Nadd Uprising.