Boundless Union

The Boundless Union is a massive universe-spanning organizational entity, roughly called what may be a "state", but due to the vast size of the Union, communication between its various component colonies is abysmal at best. Their most recent aquisition was the planet Earth, and with it, the human race. However, after the Revolution, the Boundless Union retreated from their holding on the Earth.

Overview
The Boundless Union conquers pre-FTL races in such a way that the upper classes of each world cooperate with the Boundless Union's secret invasion and undermining of their society. As soon as the Boundless Union gets their foothold into the planet's society, they will usher an all out invasion. The defenses of the world are just brushed aside as the Boundless Union uses almost extremely arcane technology to both put down resistance, and to further modify the world's biosphere and geology to fit their own needs. At time, they may even remove or add continents, changing climates and also the poor unfortunate lives who happen to live where their projects are ongoing.

Truly massive in its size, the Union spans what must be 29 times the size of our known universe. However, in their search, they have only come upon nineteen known sapient races (not including uplifted animals and sentient AI). The Union has come to realize that sentient life in the Universe is extremely rare and yet despite this fact, they tear apart any culture they come across. Based on what little records have survived, it appears that the Union was aware of an infinite universe and believed that other, far larger organizations might exist in our universe.