Rewakening

Nearly four thousand years later, some of these temples were used by the Rebel Alliance as a base of operations as depicted in Star Wars Episode IV: A New Hope. These temples went on to become the site of Luke Skywalker's Jedi Praxeum, a school where he began the re-creation of the Jedi Order. Exar Kun's presence was felt again only after Luke established his Praxeum. As a spirit, Kun appeared to the young Jedi Gantoris. The inexperienced apprentice was unable to avoid being corrupted and was eventually killed by the spectral Kun. After destroying his first Jedi in thousands of years, Kun's insatiable appetite for spreading his dark wrath escalated. He was able to successfully corrupt and partly possess the extraordinarily talented and young Kyp Durron.

In addition, he somehow sundered Luke Skywalker's spirit from his own body, resulting in great confusion and dismay amongst Luke's then-few Jedi apprentices. As depicted in the novels Dark Apprentice and Champions of the Force, Kun's spirit was eventually rousted from hiding and destroyed by the combined efforts of the Jedi apprentices, Luke's spirit, and the long-dead spirit of Kun's slain master, Vodo-Siosk Baas.