She was an operative of the Obsidian Order. Following the assassination of her predecessor Tekeny Ghemor by Ataan Rhukal prior to 2377, she was appointed as the director of the Obsidian Order by Supreme Legate Dukat. After the Iliana Ghemor of the primary universe arrived in the mirror universe and assumed the identity of Intendant Kira Nerys, she attempted to discover his fate as his primary universe counterpart had been her fiancé prior to his death on Bajor in 2359. This attracted the attention of senior figures within the Alliance, who regarded it as suspicious given Rhukal's affiliation with the Bajoran dissident movement.
Consequently, Regent Martok sent the Obsidian Order agent Corbin Entek to the IKS Negh'Var to speak with Iliana and instruct her to report to him on Raknal Station. However, Iliana had her Jem'Hadar accomplice Taran'atar coerce Entek into "confessing" that Rhukal was innocent and that he was the true assassin of Tekeny Ghemor. Furthermore, he claimed that he had done so at Lang's behest. The confession was recorded on an isolinear rod. Iliana claimed that he had committed suicide only hours after making that statement. In response to this "revelation," Martok stabbed Lang with his d'k tagh, killing her instantly. (DS9 novel: The Soul Key)