In Heirs of the Force and Shadow Academy, Jacen and Jaina discover a crashed TIE fighter from the Battle of Yavin. Jaina installs a hyperdrive in the downed starfighter and begins fixing it to fly again. Jacen, Lowbacca, and Tenel Ka help her to practice their Force skills until all are held captive by the TIE's original pilot, Qorl, who had been living in the jungle for two decades. They eventually escape, but so does Qorl, leaving the jungle moon behind and searching for any remnants of the Galactic Empire. Qorl discovers the Shadow Academy, a training ground for Dark Jedi commanded by one of Luke Skywalker's fallen students, Brakiss, along with the remains of the Dathomiri Nightsisters. These elements of the so-called Second Imperium kidnap Jacen, Jaina and Lowbacca, but they resist the dark side and are rescued by Luke Skywalker and Tenel Ka.