Water in the Netherworld   

Ren and the others descended a seemingly endless flight of stairs, each step echoing in the dimly lit underground passageway. 

The air felt cool and damp, carrying with it a peculiar scent that hinted of wet mud. The stairs, made of worn stone, bore the marks of countless footsteps over the ages, leaving an indelible imprint on the passage of time.

Lorelai couldn't resist and jokingly asked, "Are you sure this stairway doesn't lead to the other side of Eternia?"

Nori, accustomed to such remarks, responded with a wry tone. "This leads to the aquifer; that's why it's so deep. Aquifers are underground areas containing water resources, essentially reservoirs where groundwater is stored. The bed is often formed of clay and rock, acting as a natural filtration system for water. 

"The largest aquifers can span entire countries and in the Netherworld there's a lot of Aquifers here. Though all of them are now privately owned by the warlords."