Among the many mysteries that still eluded Rowan, one of them was the presence of the Underverse. This realm that lay just below the material universe was filled with darkness, where creatures that could not withstand the light of day dwelled. Space and time behaved erratically in this realm, and it was mainly used as a form of transportation by lower immortals who used the spatial folding aspect of this space to cross vast distances inside the material universe.
To Rowan, such a space was nothing special; in countless higher dimensions, there were many special spaces like the Underverse that held even more fantastical traits.
However, Rowan could not understand why some universes had an Underverse while most did not. Using his angels, he had searched through trillions of universes in the lower realm, and he had barely seen a million universes with Underverses.
