In 2377, she was serving as the personal slave of Gul Corat Damar, the commander-in-chief of the military of the Cardassian Union. Over the objections of his best friend and superior, Supreme Legate Skrain Dukat, he frequently brought T'Lana into the sauna with him to serve as his masseuse. Damar found that T'Lana's Vulcan physiology made her better able to withstand the high temperatures favoured by most Cardassians than his previous Terran and Bolian slaves. Following Damar's example, many other Cardassian officers began to bring their Vulcan slaves into the sauna with them. Their massage sessions usually ended with them having sex.
On one particular occasion, T'Lana was present in the sauna for a heated discussion between Damar and Dukat. The Cardassian leader was outraged about the Klingons' disrespect for his people; however, the most critical topic was Dukat's obsession with attacking Bajor, which had recently seceded from the Alliance. Damar, who was charged with planning the attack, insisted the time wasn't right because Cardassian forces weren't up to full strength, but Dukat wouldn't stand for it and demanded that Damar proceed with the invasion.
T'Lana, using her secret Vulcan telepathic skills, "suggested" a seditious thought to Damar that the problem may not be the Klingons, but rather Dukat. The solution to the problem, while unthinkable, was, nevertheless, the only "logical" one.
T'Lana was presumed killed later that year when Supreme Legate Damar ordered all non-Cardassian servants and slaves within the Cardassian Union to be executed. There were approximately 31 million casualties. (ST - Mirror Universe novel: Rise Like Lions)