The Blue Void is a void containing the Universe Swarm that has a bunch of blue fog floating around in it. The Blue Void’s gas is toxic to inhale or exhale. It can burn skin in one touch. so don’t go peeking around in there. The reason it’s so toxic is that it’s made of the 200th element, toxicium. If there’s too much of it, it can make stuff disappear. The Blue Void isn’t actually a void without the gas. It has tiny Dentists in it. A super tiny civilization lives in those dentists called, The Blue Voiders. They are advanced because they made it all the way to the Primordialverse.
There is some parts of The Blue Void that are empty which people have photographic evidence of, but have never actually been there. These parts are rare, like NA's voids.