The Nightsisters cometh

It’s revealed in Ahsoka episode two that sinister, Grand Admiral Thrawn-obsessed Morgan Elsbeth isn’t just a fan girl, she’s a Nightsister. If you haven’t watched The Clone Wars or Rebels, you may not have heard of these witches, and yes, they’re witches—hence why the second episode is called “Toil and Trouble,” after the Macbeth line.
Nightsisters are a coven of witches that lived on Dathomir, who historically attempted to stay out of the affairs of the Jedi and Sith. They did, however, provide Count Dooku with an apprentice, Asajj Ventress, when he came looking for one. When Ventress betrayed him, he sent his droids and General Grevious to Dathomir, where they nearly wiped out her entire sect.
It’s unclear how much more of a role the Nightsisters will play in Ahsoka, or why there’s one choosing a side in the eternal conflict between Republic and Empire, but I’m sure we’ll be seeing more of Elsbeth going forward.