The Known Multiverse

The Known Multiverse, at least, Known to the Wanderers, is a vast spacial network of worlds and universes of varying shape and size (their actually all technically the same size, it's a matter of perspective) that are all connected by one thing.   It is invisible and intangible to all but the very few, yet its impact can be felt by all (with some feeling it more than others) and it is the only thing that keeps the Multiverse together: Death.