It is absolutely certain that there are more multiverses in the 'largest' structure of them all, the Omniverse, but Obeidon is the only accessible one.
To imagine the magnitude of the Obeidon cluster, consider the ocean. Every single living organism in the oceans is equivalent to a universe (plankton can be microverses). Every cell in the organisms' bodies is a galaxy. Each ribosome in the cell is a planet. And imagine yourself as one tiny atom in this ocean. This gives you some idea of the scale, though in reality the difference in magnitude is far larger.
Obeidon possesses several spatio-temporal continuums, each with its own trajectory in time and unique features. They include the B-Continuum, in which all known universes are found, and the C-Continuum, which is mainly occupied by Boltzmann entities.
These universes are all part of the B-Continuum.
- Various Mind Houses
- Boltzmann entities are Microverses.
The Crossverse is a region of interdimensional space that separates the universes. Dimensional Rifts tunnel through this region, and the technology of interuniversal sapients inevitably brings them through this space.
Julth currently inhabit this region.