Gethzerion was the founder and leader of the Nightsisters from the planet of Dathomir. She was the daughter of Clan Mother Augwynne Djo and sister of Barukka, Kara'Teel and Allaya Djo. A ruthless and tyranical matriarch, Gethzerion ruled the Nightsisters with an iron fist and terrorized the other Dathomiri for years. Born on the planet of Dathomir many centuries before the start of the Galactic Civil War, Gethzerion belonged to the Daughters of Allya, a society of Force-sensitive females who used "magic" to control the Force, with the male population serving as servants and mates. Her mother was none other than Augwynne Djo, respected matriarch of the Singing Mountain Clan.