Summary - Hive or locust type species that can and eventually must abandon their empire to form a swarm or horde and resettle to new territory.
Homeworld - Homeworld is an asteroid field or a gas giant. They leave their home planet because they must.
Physical description - Humanoid?
Social Structure - Hive mind. It's a matrix organization.
History - Ancestors of the species 86 were benevolent and peace-loving organisms living in a utopia, peace and harmony. One day a schism emerged and civil war/whatever consumed it. After millennia of war a malevolent/benevolent resource extractor species emerged victorious.
Race Attributes - They always consume their homeworlds. Higher in the beginning but gradually declining production, growth and research. Eventually they must form a horde and hop to another systems.