Long ago, the Eldan on planet Nexus found themselves in need of a servant race that could communicate with the other races of the galaxy, and watch for developments in culture and technology that might be of interest to them. With this in mind, the Eldan created a race of sentient mechanical beings known as the Mechari.
These Mechari were sent out to observe the various inhabited planets in the galaxy, studying their individual strengths and weaknesses, and reporting the information back to Nexus. The Mechari always kept the intentions of their masters ambiguously vague - and indeed, the Mechari themselves were not aware of the true scope of the Eldan's machinations. As the centuries passed, the legend of the Eldan grew, and wild conjecture became well-worn tales about their origins, their technology, and the location of their secret homeworld.
During this time, the Mechari were instrumental in helping the humans of planet Cassus establish the Dominion, and presided over the coronation of the first Luminai emperor. Through a series of brilliantly executed maneuvers, the Mechari helped the Dominion to quickly expand, assimilating races like the Draken of planet Mikros. They also established the Imperial Corps of Intelligence to protect the empire from spies and traitors, and took it upon themselves to oversee its operations.
The discovery of Nexus was a momentous occasion for the Mechari, and they hoped to finally be reunited with their creators. But the Eldan were no longer there, their fate one of the galaxy's darkest and most enduring mysteries. Despite this disappointment, the Mechari continue their eternal vigil over the empire, ensuring its continued dominance on planet Nexus.