From publisher blurb:
The Null Sister are an elite corps of female warriors and assasins who serve as shock troops for the servant of Darkness - Krux Morta.
Qurag is a recent addition - a shape-shifting cyborg thug who has been recruited into the leadership of the Sisters.
General Psiren is the ultimate leader of the Sister and she indoctrinates, brain-washes and trains all new recruits. Secretly, she longs to displace Morta and began the chief servant of the Greater Dark herself. She bides her time waiting for the right moment for her coup...