The Works
Here is where most of the uppidy and well mannered Hullians stop smiling and scramble. The Works is a maze of caves and caverns, with twelve main shafts that pour down with water and debris from the surface, each main shaft is directly under one of the twelve crowns.
The only thing surface dwelling Hullians and delvers agree on is that; the main shafts are the only organized thing about the works. The rest of the Works is all dystopic settlements, trading spots, slave markets, subterfuge and assassination. The surface people like to pretend it does not exist, even when taking a shortcut right through it to reach other crowns of the Hull.
Most delvers cant read or write, and have never seen the Mantle, they only hear about the glory of the surface in stories told by traveling gypsies (who probably have never been there) or depicted in washed away treasures rescued from the waterways.
Hypocrites, all of them!
Many important things, however, come from the works. Water finds its way back out somehow, fire too, which cannot be created on Dron except for magical means. And much of the magic is also siphoned from deep underground.
There are many other places rumored to exist far far down in the world depths. Some of them too strange to be understood by surface dwellers.
The Shafts
These straight tunnels through the Works are called shafts. They are slightly less confusing than the rest of the works in the sense that they form a sort of asterisk at the center of Dron, and extend all the way to the center of most crowns.
Much is known about some of the shafts, while other places remain a mystery.
However the shafts are not necessarily friendly to travelers, some sections are collapsed, or full of boiling water and steam, others have huge stonebergs that orbit in their cylindrical emptiness. Even the shafts that are free to travel through have dark overlords that see that everyone that uses "their shaft" pays them tribute.
The center of Dron
The shafts converge at the center of Dron, but no explorer has ever reported reaching this place. Some tell wild tales of an endless night sea or desert at the center of the world. The truth however is surrounded by the myths presented here.
The Inner Sea
An ocean bigger than the surface of the Hull itself is said to be accessible through some of the shafts. If one falls long enough through the right shaft, eventually it will open into a giant world of water and night. A quiet dark place where light is the exception and unknown creatures rule a creation strange to everyone but the darkness.
One such creature, called Remeteraak, has ascended to a deity of avarice and pointless accumulation.
The Inner Desert
Another myth states that descending the shafts will lead into a desert of shining sand. The floor of this world-sized cavern is boundless and radiates a warm light from within. It is whispered that gods come to die to these lands, but little is known about its origins or purpose.