Sister Nicci was the former of the Sisters of the Dark. When she fulfills a promise by the Keeper that he will protect her if she serves him, she becomes one of his most loyal and deadly servants. This changes when Richard convinces her that her strength is hers and hers alone and that she does not need to serve the Creator, Keeper, or himself. Upon obtaining Richard's power and being ressurected after her death in battle, she serves as a major antagonist in the series's second season.