Ulic Qel-Droma and Exar Kun dupe Aleema into setting off a massive supernova explosion in the Cron star cluster, and shockwaves sweep toward the Jedi library planet of Ossus. Republic commander Vanicus, working with Master Thon, Tott Doneeta, Cay Qel-Droma, Sylvar, and Nomi Sunrider, arranges for immediate evacuations. Desperate Jedi scramble to rescue artifacts, scrolls, Holocrons, and other precious objects.
Sending Mandalore off to retake the former dark-side world of Onderon, Ulic and Kun begin their assault on Ossus. Kun wants to grab the artifacts for himself before all are lost in the impending holocaust. During the surprise attack, Cay recognizes Ulic’s ship and rushes aboard the Nebulon Ranger to stop his brother. After a fierce air battle, however, Ulic shoots down Cay and pursues the Ranger as it crashes to the surface.
Exar Kun takes his Massassi bodyguards and strides through the abandoned Jedi library, ransacking it for lost treasures. He encounters tree-like Master Ood, who is at work stashing a collection of ancient lightsabers in a shielded vault, hoping to protect them from the supernova firestorm. Ood resists Kun’s attempt to steal the lightsabers by undergoing a final metamorphosis, plunging roots into the ground and driving Kun back with a blast of power drawn from the depths of Ossus. Unfortunately, Ood is now firmly planted and will not be able to escape the starfire due to strike in only a few hours. Leaving Ulic to take care of himself, Kun takes his booty and escapes to his secret base on Yavin Four.
After downing the Nebulon Ranger, Ulic confronts Cay in the wreckage. Cay, still insisting that he can save his brother, keeps urging Ulic to return to the light side but he refuses. As they duel with lightsabers, Cay continues to provoke Ulic, begging him to snap out of his shadowy trance caused by Sith poisons and Ulic’s own burning guilt at his failure to protect Master Arca. Finally, when he can no longer stand it – as Nomi Sunrider and Tott Doneeta rush to stop the clash – Ulic strikes down his own brother and is left in shock and horror of what he has done...