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The Omniverse is everything that is. It incorporates every universe, known and unknown. There exists within the Omniverse clusters of universes that have access to each other; they share common themes, Natural laws, Common Geography, common personalities, or common organizations. These clusters are what we call Multiverses. There are many multiverses within the Omniverse.
After the breaking of Zion, the universal city's inhabitants were scattered across infinite realities. nested in idealized time to hide their memories of Zion. To most Zion is a creation myth, some wander the lands claiming to remember it's streets, but that's just foolishness