Thelean Dominion

Essentially, the Thelean Dominion is a dictatorship. It has a single absolute monarch, Creaton, who holds all of the governmental powers. He delegates a lot of the work to his Primuses/High Lords (known as Darghae), but he can take that power away at any moment and his will is law in Thelean society. There are no other political parties in the Dominion, and any who might attempt to challenge the current rule is swiftly dealt with (not that there are many of these - most Theleans seem to have no issues with the current system). To the average Thelean, Creaton is not just a (political) leader, but a living deity: he has almost single-handedly built the Dominion into its current shape as the most powerful nation in the galaxy. His inventions are what allowed the Theleans to prosper, with inventions like the exo/endoskeleton and technically unlimited life extension.

Many would be outraged at the idea of challenging Creaton. The practice of banishment or even execution for traitors is something most Theleans agree with fully.

In case he was killed, Creaton has set up some contingency plans - including ones in which his physical termination might allow his mind to survive, but this system is a work in progress and not at all guaranteed to work - so it might not crumble immediately. His Primuses can keep the Dominion running, and Creaton has set out clear goals for the Dominion to follow. However, without his absolute rule, things will quickly start to become chaotic. The Theleans would try to follow Creaton's plans, but outrage and disbelief will put the Dominion on edge. There will be chaos, and it's possible there will be a fight for power. (not necessarily amongst the extremely loyal Primuses, but from plenty of other parties within the Dominion)

In the follow-up to the original roleplay, Creaton was missing or dead, and the Dominion eventually split into several smaller fractions. Some of these held tight to Creaton's ideals, while others took up new goals and ideals. The Dominion likely wouldn't survive Creaton's death, but the Theleans would endure.