Celestial

The Celestials were an ancient secretive civilization who lived in the times of the Pre-Republic era, before the formation of the Galactic Republic. Very little is known about them other than that they were a highly advanced species.

Only a few races excisted by the time of the Celestials, and had contact with them. The Killiks were known to have been enslaved by them, the Infinite Empire was at war with them, and the Chiss Empire had contact with them.

It was unknown what caused the race to disappear, but the Chiss Empire knew the cause but didn't release the information to the rest of the galaxy.