Barlowe expanded this universe in his illustrated novel, God's Demon , and its sequel, The Heart of Hell .

Each of the 40 color paintings is a grotesque masterpiece. Barlowe's hell is not a fire-and-brimstone pit, but a terrifyingly where the architecture is "archi-organic" and living. Buildings pulse with millions of miles of blood vessels, and cities are built by "soul laborers," which are human souls twisted into building blocks.

Many demons are fused with strange organic technology, blurring the line between living creature and machine.

to the very ground underfoot, is often depicted as grown and tortured from the souls of the damned. Inspired Roots : Barlowe drew deep inspiration from John Milton’s Paradise Lost and Dante Alighieri’s Divine Comedy

Processing centers where the incoming tide of souls is sorted and reshaped for construction or consumption. The Alien Anatomy of the Demonic

Barlowe moves away from generic demons to create the "Major Order"—lofty, towering, biomechanical entities that rule over various territories. They possess a strange, tragic nobility, mixed with absolute cruelty. A Biological Ecosystem