FALL OF THE REPUBLIC
The Nightsisters, an ancient matriarchal order of Force-using witches, ruled Dathomir during the Clone Wars, spurning all alliances and regarding outsiders with suspicion.
The Nightsisters’ rule of the planet came undone when their leader, Mother Talzin, agreed to help Asajj Ventress avenge her betrayal at the hands of Count Dooku. The Nightsisters tried to assassinate Dooku, and then sent him a new apprentice, Savage Opress, who was secretly loyal to them.
The Nightsisters’ plots against Dooku failed and he sent General Grievous to wipe out the order. The Nightsisters fought back with ancient spells, but were overwhelmed and massacred, leaving their rule little more than a memory.
THE DARK TIMES
In order to fully unlock the secrets glimpsed in the Jedi and Sith holocrons, Maul, the former Sith, took Ezra Bridger to his home planet of Dathomir. There, Maul used Nightsister magic to obtain the knowledge they were seeking. While the dark ritual proved successful, the spirits of the Nightsisters were awakened, and they demanded payment in the form of host bodies. Eventually, Maul escaped, and Ezra struck the Nightsisters’ sacred altar, vanquishing the specters.
The Nightsisters are a coven of witches that lived on the mysterious world of Dathomir. The sisters ruled unchallenged, gifted with the power to wield dark magicks. The men of Dathomir, the Nightbrothers, lived apart from the witches, but were subservient to their whims. Despite their power, the Nightsisters avoided the conflict of the Republic and Sith, content to pursue their own matters. The Jedi gave them a wide berth, for they remain focused on matters on Dathomir. Count Dooku has had dealings with them in the past, and turned to them when he was in need of a new apprentice. Their betrayal of Dooku earned the Nightsisters a powerful enemy, and he ordered a massive attack by his droid forces in retribution.
A deadly, agile Sith Lord trained by the evil Darth Sidious, Darth Maul was a formidable warrior and scheming mastermind. He wielded an intimidating double-bladed lightsaber and fought with a menacing ferocity. Though he fell in battle against Obi-Wan Kenobi, the Zabrak from Dathomir would prove to be much harder to destroy than originally believed.
Mother Talzin, the spiritual guide of Dathomir's Nightsisters during the Clone Wars, held enormous power on her homeworld and wielded the strange magicks of the Nightsisters. She sold the services of the Nightsisters to the galaxy's wealthy and powerful, but wasn't above backstabbing any clients who treated her clan with disrespect. She sought revenge against Count Dooku and his master, Darth Sidious. Dooku had betrayed the Nightsister Asajj Ventress, but his crimes paled in comparison with Sidious’s. Long before the Clone Wars, Sidious had promised to make Talzin his right hand, only to renege on his promise and steal her son, Darth Maul, to train as his apprentice.
An assassin trained in the ways of the dark side by Count Dooku, Asajj Ventress yearned to be considered a true Sith, but such status wasn't allowed under the Sith's Rule of Two. Ventress fought with twin red-bladed lightsabers, and clashed with Obi-Wan Kenobi and Anakin Skywalker many times. But her destiny would not lie with the Sith. After Dooku rejected her as his apprentice and tried to kill her, Ventress returned to her roots as a Nightsister, made a living as a bounty hunter, and – in the strangest twist of all – rediscovered the way of the light that she’d rejected long ago as a Jedi Padawan.
Savage Opress was once a common Nightbrother whose fighting prowess impressed Asajj Ventress. Transformed into a monstrous warrior by Mother Talzin, Opress became Count Dooku's new assassin and secret Sith apprentice. His loyalty, however, remained to Talzin. The Nightsisters leader gave Savage a new quest: to find his brother, Darth Maul, who had somehow survived his apparent death and was living in exile in the Outer Rim. Savage located Maul and became his brother’s enforcer in the Shadow Collective, but died when Darth Sidious confronted the two Sith warriors on Mandalore.