The Unescapable Verse
The Unescapable Verse is a universe contained by the Multiverse. It is just one of the many universes floating around in the multiverse, like our own, except it is a universe where the multiverse, or anything higher than it, doesn't exist. If you were to ever travel there, you wouldn't be able to escape because your own universe wouldn't exist, hence the name, "The Unescapable Verse."
The only possible way to leave it is to completely destroy it.