Suhlacil

The Suhlacil were a sentient race of nebulae millions of years old from across galaxies.

Background
They were known to form large masses within their forms, over time, and hurl them towards celestial bodies at light speed.

It's believed that a great war was waged against them in ages past, ultimately leaving them defeated but not destroyed. Ruins from the war can be seen along the surfaces of far-distant worlds like Nullen.