In the time before her ascendancy, Malys had been a consort to Vect himself, and had been remarkably intelligent even then. In time Malys became one of the most prominent members of Vect's Inner Circle, particularly after the talent she displayed in the Panacea Wars. After a time, Vect grew bored of the distraction Malys provided, and banished her from his court. Infuriated, Malys and her followers left Commoragh for the webway. In the "wilderness" of the webway, Malys had encountered one of the many strange beings that inhabit the realm. The being banished Malys' followers, and challenged her to a contest of wills, the victor of which would gain the heart of the loser. Amazingly, Malys had won the contest with the trickster, and the being had dissipated, leaving an animate blade and its crystal heart behind. Malys used the blade to remove her heart, and replaced it with her prize. Malys returned to Commoragh, determined to have revenge on Vect, and began her slow rise to power.
In 345.M37, Malys led her Kabal of the Poisoned Tongue against Ork Freebooterz on the world of Graegus after the Greenskin fleets raid her own forces. Malys captured a Nob and infected it with a deadly virus sensitive to the Ork reproduction cycle. Malys dropped her new biological weapon onto the Ork forces on Graegus many weeks later, annihilating the greenskin population.
Like most Dark Eldar Archons, Lady Malys is a swift and deadly opponent, and a ruthless and skilled leader. Although intellectual and genteel, Malys is very dangerous in and of herself, and arms herself with a razor-edged steel fan and a sword called "The Lady's Blade". Presumably the same sword left behind after her contest in the webway, the sword is semi-sentient.
Both weapons are very deadly in her hands, though the Lady's Blade is prone to rebelling and crippling her combat capabilities. Due to her strange powers, she and her company are immune to psychic powers and she's precognizant enough to dodge weapons fire and enemy blows, or to stay one step ahead of her opponent's strategy.