The Cult of Exar Kun represented a Sith cult whose members were dedicated to venerating Exar Kun, the Dark Lord of the Sith.
This Cult of Exar Kun came into existence around 1 ABY. At that time, an archaeological mission from Corellia University explored the Temple of Exar Kun situated on Yavin 4. Inadvertently, the expedition team discovered the temple's underground catacombs, which caused Exar Kun's spirit to awaken. The spirit then enslaved the team, transforming them into zealous cultists wholly devoted to worshipping him.
Certain cult members journeyed to a Corellia University research outpost located on Talus. There, they recruited new followers from among the students and researchers. One researcher, who claimed an unknown force was compelling people to join the cult against their will, resisted and was subsequently killed.
The cult established its base within the catacombs beneath the Temple of Exar Kun. Their existence continued until a group of spacers, hired by Professor Cornelius Wagglehorn to eliminate the cult, destroyed it completely.
The Cult of Exar Kun made an appearance in the 2003 video game Star Wars Galaxies. This massively multiplayer online roleplaying game was created by Sony Online Entertainment and published by LucasArts. The game was shut down on December 15, 2011. The Cult of Exar Kun, along with the "Exar Kun" Heroic Encounter, was integrated into the game via the "Chapter 9" update, which was released on April 3, 2008.