Hyperfield
The hyperfield was a megastructure created and inhabited by Species 10-C. It was located outside the Milky Way Galaxy, two light years from their original homeworld and some thirty light years from the galactic barrier and the home region of the Stilph civilization. ()

History
After determining the origin point of the DMA in 3190, the  crew deduced the presence of the hyperfield from Stilph stellar surveys of the area. Starfleet subsequently dispatched Discovery to the hyperfield to make first contact. It was hypothesized that Unknown Species 10-C constructed the hyperfield in the late 22nd century, shortly after their homeworld was rendered uninhabitable by a series of massive asteroid impacts. ()

Characteristics
The hyperfield was a flattened spheroid with a  of 228 million kilometers or 1.5 astronomical units, and a gravitational presence of 1.3 solar units, sufficient to affect the orbits of nearby extragalactic stars. It functioned like a Faraday cage, blocking sensor readings of its interior. It did not emit broad-spectrum black body radiation, like a natural celestial object would, nor any detectable communication signals. The structure required a colossal amount of energy to maintain, which was provided by boronite extracted by the Dark Matter Anomaly. The hyperfield enclosed a small star system containing three gas giants, all identical in mass and chemical composition. ()

Celestial objects