Mysterious Precursors, millions of years old. As the only contact with them being the main characters, and them only having met members of the species for a few hours, information and specifics is very scarce.
Mechanical chassis controlled by a relatively small organic creature. Extremely intelligent. The body is capable of rapid restructuring and repair, and can change size on a whim. Apparently powered by a central black hole reactor.
Geographic Origin and Distribution
Currently, the only known settlements are on their ring.
Perception and Sensory Capabilities
Similar to humans in range of senses, eyesight, hearing, etc. But also capable of other, more uncharted senses. Eyesight ranges partially into infrared.