Orii

Orii, named and discovered by The Neraavians meaning 'demoness of the night' is a relatively old black hole, at the heart of the Orii Cluster.

The black-hole lies in the almost perfect center of the cluster, and is believed to have collapsed in from the largest star in the cluster's history, as not many stars within the borders of the cluster are large enough to collapse into a blackhole.

The blackhole does not possess a jet, or an accretion disk, which suggests it has not had a very large meal in millions of years.

It has fallen into a stable relationship with the cluster, no stars or planets show a pattern of orbital decay or potential inward spiraling, meaning Orii may not have a large meal for millions of years, until the cluster begins to degrade.

Additional;

Atlas orbits the blackhole, though not up close.

The Krux'Han use the blackhole essentially as a battery for many of their units.

Extensive study has been done into the blackhole, though not even the toughest probes survived beyond the event horizon.