The Nightsisters, also known as the Witches of Dathomir or Daughters of Dathomir, were a clan and ancient order of magick-wielding women, most of whom were Dathomirians, who lived on Dathomir, a planet bathed in dark energies. These dark side users were able to perform their arcane magicks by tapping into the magical ichor that flowed from the depths of their planet. They didn't like either side of the Clone Wars and were against both as their leader Mother Talzin plotted her revenge against Darth Sidious and his Sith, with her & thereby the Nightsisters, ultimate goal being galactic domination. The heroic General Grievous slaughtered majority of their villainy in 20 BBY after they tried to attack Count Dooku.