One small clue in Ahsoka hints at the ancient Sith’s heritage and the origins of some of their most devastating dark side insignia. Ahsoka has rewritten the Star Wars galaxy’s past, revealing that it was previously part of a great intergalactic civilization anchored in the dark side of the Force. The Nightsisters of Dathomir came from the faraway planet Peridea, which was located in another galaxy, and were ruled by a Zeffo named Kujet.
The Star Wars galaxy’s ancient history has long been shrouded in mystery, with unsolved mysteries about the origins of both the Jedi and the Sith. These revelations, however, go back far further, raising many more questions, most notably concerning what happened to this interplanetary civilization in the first place. It obviously collapsed, becoming the stuff of folklore, but the cause of the collapse is unknown. However, Ahsoka is resurrecting some of these old powers; the Great Mothers of Peridea are collaborating with Thrawn, and their black magick is definitely derived from the same origins. Ahsoka episode 7 may have indicated their enduring influence on the galaxies in a subtle way.
Although both are steeped in the dark side, Nightsister magick differs from Sith Force use. Nightsisters access the dark side indirectly, which means they are not devoured by its power and are not compelled to compete with one another; instead, they collaborate, synergizing their skills. The Great Mothers use a tracking spell to demonstrate this in Ahsoka episode 7. The Force bends around them in the shape of a red triangle as they do so. This design is a fantastic match for one of the Sith’s oldest symbols.