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Despite Jedi, Sith, Imperial Knights, Knights of Zakuul and Nightsisters, they are many other obscure and often powerful Force Cults in the Galaxy. Rank them in Power. Here are a few suggestions:
-Sorcerers of Rhand
-Aing-Tii
-Baran Do
-Jensaarai
-Mind Walkers
-Sorcerers of Tund
-Prophets of the Dark Side
-Zeison Sha

Jensaarai learn of the light side and the dark side.

As far as power goes though, they aren't very good.

Also, would the Revanites count?

If you want too.

The Prophets and Rhand are 1st and 2nd as I see it. Not sure about the rest.

Imo, the Rhandites and the Mind Walkers are likely the most powerful.

Aing-Tii fold the space between the other cults and the nearest sun.

In terms of the most powerful individuals:

The Order of Revan (Revan)
Force Hounds (Tau/Xesh)
The Nightsisters (Gethzerion)
The Knights of Zakuul (Arcann)
The Inquisitorius (Jerec)
The Order of Shasa (Ortuno)