Precursors

The tentatively-named "Precursors" are a variety of ancient species and entities that once inhabited, controlled, or were otherwise active in the Black Rim, but have long since disappeared from the galaxy at large.

At one point perceived as a singular civilization, these precursors are now understood to have been at least three seperate entities interacting with the galaxy. The activities of these entities have played a significant role in shaping the galaxy as it's denizens know it, and all three have been considered divine beings by various civilizations.

In reality, these forerunners were the native-born Obelisk Builders, the enigmatic Serene, and extragalactic IDA Dominion.