Leviathan

Leviathans are the collective term for the immensely powerful creatures that feeds off the energies native to the Void. Normally they are considered non-sentient, those that have managed to cross over into Realspace soon gain sapience as they continue to feed on the stars and celestial objects that surround them. Once they do become sapient, Leviathans keep themselves hidden within darkspace in between star systems or gas giants.