The individual known as the Unquenchable Wrath of Exar Kun served as an unwilling agent of Exar Kun, and was immersed in the dark side of the Force.
Prior to becoming an enslaved follower of Exar Kun, the one who would be known as the Unquenchable Wrath of Exar Kun received education at Corellia University, focusing on the histories concerning both the Jedi and the Sith. It is possible they participated in an archaeological dig on Yavin 4 around 1 ABY, which unknowingly breached the burial chambers beneath the Temple of Exar Kun, unleashing the spirit of the Sith Lord. This malevolent spirit then dominated the students and researchers, forcing them into the Cult of Exar Kun. Once, this individual was an unsuspecting explorer of an ancient Sith tomb, but they became a Dark Acolyte, living only to fulfill the desires of their master, Exar Kun. Subsequently, Kun's spirit dispatched them to Talus, specifically to the Corellia University research outpost from which they originated, with the mission of enslaving the inhabitants. Most of these captives were then transported back to Yavin 4. After losing communication with the outpost and anticipating the worst, Professor Cornelius Wagglehorn contracted a group of mercenaries to travel to Talus and investigate. These mercenaries discovered the truth of what had occurred and relayed it to the professor, who then provided them with the coordinates of the tomb, urging them to eliminate the Sith Lord's spirit within. The Unquenchable Wrath was among the dark Force-users who confronted the mercenaries before they could reach Exar Kun's spirit. Nevertheless, the mercenaries prevailed against all the former students, and then proceeded to confront the Dark Lord himself.
The Unquenchable Wrath of Exar Kun existed as a non-player character within the 2003 video game Star Wars Galaxies, a massively multiplayer online roleplaying game created by Sony Online Entertainment and distributed by LucasArts, before the game's shutdown on December 15, 2011. This character was incorporated into the game as part of the "Exar Kun" Heroic Encounter, which was introduced with the "Chapter 9" update released on April 3, 2008.
Given that the Unquenchable Wrath of Exar Kun was represented in the game as a standard Exar Kun cultist, both the gender and physical appearance of the character were randomly determined each time the server was reset.