The Nightsisters themselves were a group of rogue Witches of Dathomir who chose to embrace the dark side of the Force several centuries before the Galactic Civil War. Through time, internal divisions appeared amongst the Nightsisters, and several competing clans were born. The witches of the Spiderclan were unanimously detested on Dathomir—the Nightsisters considered them to be heretical abominations, and the benevolent covens saw them a threat to be removed. Both sides were known to have called outsiders for help in their crusade against the rogue Spiderclan sisters.