The Greek Underworld, the Egyptian Tuat and the Kabbalistic Sphere of Yesod are the same place: The place you go to when you die. It is the ethereal Astral World of the Occultists and the place you visit in dreams.

Within this World anything envisioned by man exists in a more magnified and dreamlike form. In fact it is the World in which the basis for everything that happens in our World already exists before manifesting itself in our World.

A character or an entity (in this case a character who believes he is the biblical king, Solomon) exists in this World and has become trapped in it, wanting to ascend to the higher Kabbalistic Spheres to reach union with the One or Divine.

But the Yesod is now becoming polluted by all the filth and degradation of our World which is reflected by intensification in Kliphothic or demonic activity and other more repugnant horrors which best remain unspoken.