The Omniverse is a collection of multiple Megaverse on the other side. It's everything that exists, doesn't exist, anything in between, below, above, anything any being within all can imagine with a name, except God. who is real.
Those without an actual name technically exist outside the omniverse. The omniverse and The Outside are all that is outside of the omniverse, in The noname verse.All else is The Box, which contains all the omniverses, no questions about it....maybe.