Exegol

Exegol was a desert planet located within the Unknown Regions that, according to legend, was the hidden world of the Sith. It was occupied by the Sith Lord Darth Sidious and the Sith Eternal by 35 ABY. It was also the birthplace of former First Order Supreme Leader Snoke, whom Sidious created to rule the First Order while concealing himself in the shadows as the true ruler. Exegol was used to hide the Sith fleet amassed by Darth Sidious and the Sith Eternal, from where they planned to deploy the Sith fleet and use the Final Order to establish a new Empire. Exegol was the site of a battle during the war between the First Order and the Resistance, which saw the defeat of the Final Order and the Sith Eternal.

Description
Exegol was a dark, barren, and rocky world with desert flats. The planet's dry conditions combined with the rubbing of dust particles in its atmosphere created enormous static discharges that appeared as lightning strikes on the surface. The planet was covered with enormous fissures that reached deep into its crust. These fissures were excavated by Sith loyalists in the ancient past, who were attempting to reach a vergence they believed to lie beneath the surface.

Early history
Exegol was one of the oldest Sith bastions, dating back to about a thousand years prior to the fall of the Galactic Republic.

Sith Eternal
By the era of the Galactic Empire, the last Sith Lords, Darth Sidious and Darth Vader, possessed the only two wayfinders leading the way to Exegol. After Sidious' death at the Battle of Endor, the Sith Eternal cult chose Exegol as their base because it was completely hidden from even the most studious of galactic historians, some of whom knew about Moraband and the other Sith worlds.

Appearances

 * Star Wars: Episode IX The Rise of Skywalker