Hypothetically speaking, the concept of what lies beyond the multiverse is highly speculative and largely dependent on the specific theoretical framework or hypothesis being considered. It's important to note that our current understanding of the universe and the multiverse is limited, and many theories are still under active research and debate.
One possibility is that there could be an overarching structure or entity that encompasses and governs multiple multiverses. This could be referred to as a metaverse or a higher-level reality that contains and connects different multiverses. However, the nature of such a metaverse and its properties would be purely speculative at this point.
Another possibility is that the multiverse itself is infinite and contains an endless array of universes with different physical laws, constants, or dimensions. In this scenario, there may be no defined "boundary" or "beyond" the multiverse, as it extends indefinitely.
It's worth mentioning that these ideas are highly speculative and go beyond the current scientific consensus. The nature of what lies beyond the multiverse, if anything, remains an open question in theoretical physics and cosmology. Exploring such concepts often involves pushing the boundaries of our current understanding and requires the development of new theories, empirical evidence, or breakthrough discoveries.