On the advice of the spirit of the Sith Lord Freedon Nadd, the fallen Jedi Exar Kun traveled to the jungle moon of Yavin Four and encountered the Massassi-the primitive servants of the dead Sith Naga Sadow. The Massassi took Exar Kun prisoner and prepared to sacrifice him to a monstrous wyrm.
Exar Kun was forced to use his growing connection to the dark side to free himself. Freedon Nadd appeared once more, congratulating his student. But Exar Kun had tired of Nadd's meddling and used his newfound strength to obliterate Nadd's spirit. Cowed, the Massassi bowed before Exar Kun as his slaves.
Exar Kun's power grew. He ordered the Massassi to build immense temples and to seek out Naga Sadow's lost battleship. He also used Sith alchemy to create horrific monsters, including terentateks that hungered for the blood of Force users. But powerful as he was, he could sense a distant rival: Ulic Qel-Droma.