Not yet anyway. Even kas can be redeemed (maybe) but not the faceless. Not ever. Either she dies or escapes by the end of the story.
Personally, I like the idea of of not killing her - solely for the idea of turning ALL of Tolus' lieutenants against him by the final act - leaving him with nothing and nobody. His most loyal lizard (I forgot his name): added to Quin's collection.
Whisper: Abandons him when he gets what he wants or smart enough to know the Champ is too strong.
Blood Knight: She's a victim, and deserves a chance at redemption.
The Blade: Learns her devotion is one sided and abandons him. (He's literally planning to turn her into a demon, just so he can understand how the process works and get ahold of Lethcite)
Demon Twink: Already dealt with - either rotting in a cell or just rotting.
Val? (The Bimbo Minotaur from the Ring of Fate) Loyal to Kas - so no issue there.