The Perseus Corporeal were the species behind Perseus Corporation. They lived for millennia in a symbiotic relationship with the Ethereal. Under the Ethereal's direction, the Perseus Corporeal took five thousand years to integrate the population of Tetra Persei Two into the Ethereal.
The Corporeal first made contact with humanity in 2019 when UNASA detected two of the Corporeal's settlements on the moons of Jupiter and Saturn. (PROSE: The Ethereal)