"Though vast expanses of our material reality remain shrouded in mystery, it would be erroneous to dismiss our cosmology as mere conjecture. The venerable texts of antiquity, coupled with our present-day celestial observations, coalesce to reveal the transformations wrought during the Age of Silence and delineate those vestiges of our world that remain unaltered since its inception. In this chapter, I shall elucidate the structure of Netherdyn, from the moons that grace our heavens above to the sentient Plexus that lies beneath our feet."