The Sphere

The Sphere is the last of a unknown sapient mechanical alien species. It's species are said to have transcended biological bodies and become mechanical.

History
The Spheres species fought The Harvester aliens for thousands of years after their planet was consumed by them. They gathered together many members of alien races who's planets had also been destroyed by the Harvesters. However the Spheres species were all but destroyed and the Sphere is the last of them.