There where two main voice actors for The Dark Brotherhood Resurrection: Part 1 . I myself did all the male voices, but my good friend and professional voice actress Meg McDonald (Lovingly refereed to as 'Meggers') did all the female voices, including the character Averna.
I struggled to give her good notes and direction with Averna, as her motives where always subtle and I didn't always take into consideration that Meg has never played an Elder Scrolls game. She did pretty good with the psychopathic, sadistic character, and her performance as a dying woman was fantastic. The part she had the most fun with, and the character I enjoy killing the most, is Susan Gold-Love
The only direction I gave her for this character was: “You are playing a drunk, rich teenager. The medieval version of a spoiled daddy's girl. I want this character to be as annoying as possible, I want the player to enjoy killing her”
The performance she gave me was so stellar, I spent far too much time making sure the player could hear Susan's dialogue before even getting the quest to kill her.