Ethereal Empire

"Republic...? I don't know of any 'Republic'. I come from the Ethereal Empire, which has stood for many centuries and shall stand for many more."

- Talen Antarus, after being awoken from long-term carbon-freeze

The Ethereal Empire was an ancient government established long before the rise of the, during the era when the were still prevalent in the galaxy.

Foundation
The founders and original leaders of the Empire were the Ethereal Family, themselves Celestials, who desired to help the peoples of a number of worlds, predominantly those inhabited by the early Ethereal Humans. These worlds were subject to frequent raids by a common enemy, however they lacked the capacity to defend themselves, even if they hypothetically were to work together. Thus, the Ethereal Family stepped in, becoming the Ethereal Emperor, Ethereal Empress, Ethereal Prince and Ethereal Princess. They promptly led the peoples of the newly-created Empire to victory against their attackers, and began leading them towards a unified, communal society. Over time, more peoples came to join the Ethereal Empire of their own choice, including the K'Sar, the Adrexi and the Nok'Van, however these peoples lived some distance away from the Empire's roots, and so it was decided that continuing to run the Empire from whichever world the Ethereal Family was currently located at was simply no longer feasible. This led them to use their abilities as Celestials to construct the Elysian City, a location set on a separate plane of reality from the galaxy at large and accessible by a monolith that they constructed near the worlds of their newer subjects, though the new Ethereal capital would eventually become accessible by specially-constructed buildings on each of the Ethereal Humans' respective homeworlds.