Coven

Coven was the name given to a group or assembly of Witches on the planet Dathomir. During the Clone Wars, one particular coven of dark side-wielding Nightsisters was led by Clan Mother  Talzin.

Behind the scenes
In real-life, the word coven used to designate an assembly or band of usually thirteen witches. Due to the term's association with witchcraft, followers of the Neopagan religion Wicca also described their gatherings as covens.