Lady Malys

"'I trust there is a very good reason for you interrupting me during my... Private hours.'"Lady Malys is the Archon of the Kabal of the Poisoned Tongue, and a significant rival to Commorragh's ruler, Asdrubael Vect.

Official Canon
Lady Malys was formerly a member of Vect’s Kabal of the Black Heart, and even his lover. However, whether out of boredom or fearing her ambition, Vect cast her out. She and her followers left Commorragh for parts unknown in the Webway, until she was confronted by Cegorach, who challenged to a game of wills, with the loser cutting out their own heart. Malys won, and Cegorach disappeared, leaving behind his crystal heart and a dagger. Malys replaced her own heart with the crystal heart, and returned to Commorragh, hell-bent on revenge.

She quickly rose back up the ranks to become Archon of the Kabul of the Poisoned Tongue, and carefully planning Vect’s demise. She can be heard in the privacy of her room laughing hysterically at times.

TTS Canon
Malys is informed of the Inquisition’s arrival into a Commorragh by Tahril. Confused as to this unforeseen event, she tells Tahril to follow them. Alone, she begins conversing with her own reflection, who is in fact Cegorach himself. She begins to laugh hysterically as her face morphs into that of Cegorach’s.

Trivia

 * Unlike the other Dark Eldar characters, Lady Malys speaks with a thick French accent. This may or may not have to do with the fact that Cegorach’s voice actor also speaks with a French accent.
 * She is first seen saying random french proverbs (dubbed as "[clown speak]" in the official subtitles) in french while laughing to herself, proverbs such as "Little by little, the bird makes its nest." among others.