Darklight often is used in reference to a mystical power, sight, etc in sci-fi/fantasy. I've always just liked the sound of it.
This one I got from the series Legend of the Seeker which is based off of the great book series Sword of Truth. The Mord'Sith are a sisterhood of ruthless powerful warriors that you really don't want to mess with.
My crew is made up of liberated Orion slave girls carrying a grudge. They're free now and out for revenge.