Rullak served as the Quarren delegate for the Diversity Alliance, an organization promoting alien superiority, in the year 24 ABY. Although he was part of Nolaa Tarkona's closest advisors, his motivation for joining was solely for his own self-aggrandizement.
During the conflict known as the Battle of the Emperor's Plague Storehouse, Rullak engaged in combat with Bornan Thul. Bornan managed to disarm Rullak, taking his blaster, and then pushed him away before making his escape. Consumed by anger, Rullak chased after Bornan, who had taken cover between two containers holding biological weapons.
Driven by unbridled fury, Rullak fired without aiming carefully, and some of his shots impacted the plague containers and nearby spheres. An irate Nolaa told him to cease firing, but it was too late; lethal pathogens had already been unleashed into the atmosphere. A plague specifically targeting Humans infected Bornan, while a plague designed for Quarren infected Rullak, resulting in the deaths of both individuals.