Spirit (Nightsisters)

The spirits were supernatural beings which the Nightsisters of Dathomir thought to exist. According to their beliefs, there was another realm, a parallel plane to the physical world that was inhabited by spirits. This spiritual realm was thought to be governed in balance by the Twin Deities, the Winged Goddess and the Fanged God, which were depictions of the Light and Dark Side of the Force.

The Nightsisters also believed the two realms were so close on Dathomir that only their shamans could carry messages between them. The thought the spirits bestowed fertility upon the clans and claimed the souls of the dead.

Existence
Ventress once wrote that Ky Narec and Dooku did not believe in spirits. Indeed, the Jedi thought the work of the spirits was a primitive name for the Unifying Force and the Living Force.

There are many parallels between the spirits and the Force. Mother Talzin would say a Nightsister had to serve the will of the spirits, just like a Jedi would serve the will of the Force. Moreover, it is said that Allya foretold the rise of a perfect being 'brought into existence by the spirits', which is very reminiscent of the prophecy of the Chosen One.