User blog comment:ImperiexSeed/Supernatural Mysteries/@comment-3481504-20130307031256/@comment-3481504-20130307142228

Clearly, Leviathan don't need oxygen--for they don't breathe air--nor do they need the sun to sustain themselves, like a Earthly organism would, like a human or a dog. However, the race in a generalized sense do need a type of sustenance, while the high-tier Leviathans, like Dick and Edgar, can contain their hunger. Of course, they could survive in a vacuum in space. Space/the atmosphere, too, is made up of particles. What I'm saying is, they simply could not survive in the void of nothingness as God and Death can.