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They were formed by a revived Emperor Sheev Palpatine after the Galactic Empire was defeated at the Battle of Endor and the Death Star II was destroyed. They used the First Order as a distraction while they built up a massive fleet of Xyston-class Star Destroyers outfitted with axial superlasers to once again conquer the galaxy. They later merge with the First Order to form the Final Order and invade the galaxy to establish a New Empire to reign supreme.
Following the defeat of the Galactic Empire at the Battle of Endor, which saw the destruction of the Death Star II, the resurrected Emperor Sheev Palpatine retreated into the Unknown Regions with a collection of his followers to rebuild his fleet. From the shadows he formed the First Order to antagonize the New Republic and distract from his real plans, to build up an extremely large fleet of Xyston-class Star Destroyers and use them to swoop in and conquer the galaxy once more, in an attempt to restore the Sith Empire.
Darth Sidious was eventually defeated by his secret granddaughter Rey and suffered his final death when she directed her grandfather's Force lightning back upon him. After Sidious died, the remaining Sith Eternal both on the surface of Exegol and in the Sith fleet were themselves decimated. A number of uprisings took place across the galaxy, causing the rapid collapse of the Sith Eternal-backed First Order.
- Darth Sidious - Founder / Leader / Shadow Benefactor and True Leader of the First Order / Galactic Emperor of the Final Order / Commander-in-Chief of the Sith Eternal Military / Dark Lord of the Sith (deceased)
- Enric Pryde - Allegiant General / Second-in-Command / De-Facto Supreme Leader of the First Order / Member of the First Order Supreme Council / Supreme Commander of the First Order Military / Commanding Officer of the First Order Army / Supreme Commander of the Sith Eternal Military / Commanding Officer of the Sith Eternal Fleet / Owner of the Resurgent-class Star Destroyer Steadfast (deceased)
- Amret Engell - General / Member of the First Order Supreme Council / Second Head of the First Order Stormtrooper Corps / Second Co-Head of the First Order's Stormtrooper Training Program
- Frantis Griss - Admiral / Member of the First Order Supreme Council / Commanding Officer of the Steadfast Battlegroup / Commanding Officer of the Resurgent-class Star Destroyer Steadfast (deceased)
- Masir Trach - Commander on the Resurgent-class Star Destroyer Steadfast / Commander on the Resurgent-class Star Destroyer Finalizer (deceased)
- Lanzora Garan - Lieutenant on the Resurgent-class Star Destroyer Steadfast (deceased)
- Tishra Kandia - Intelligence Officer on the Resurgent-class Star Destroyer Steadfast (deceased)
- Ochi of Bestoon - Sith Eternal Assassin / Member of the Acolytes of the Beyond (deceased)
- Chesille Sabrond - Captain of the Xyston-class Star Destroyer Derriphan (deceased)
- Milon Lenwith - Lieutenant on the Xyston-class Star Destroyer Derriphan (deceased)
- Simero Quonit - Petty Officer / Fleet Technician (missing in action)
- ST-I4191 - Sith Trooper (missing in action)
- ST-A1215 - Sith Jet Trooper (missing in action)
- Unlike in the old Galactic Empire, where the Sith leadership was a secret to the public, the Sith Eternal that would form the New Galactic Empire would have their Sith leadership openly seen by everyone.