Devils were perhaps the largest arms dealers in all the Lower Planes. After all, aside from them, the other Lower Planar fiends simply had no manufacturing capacity.
Relying on this advantage, devils had been living better and better lives in the Lower Planes. Not only could they draw souls from the Styx, they could tempt souls in the Material Plane into falling, and they could also rake in souls by doing business.
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According to incomplete statistics, nearly twenty percent of Hell's annual soul GDP was supplied by demons... That was already an astonishingly high proportion.
The primary source was arms dealing. Devils sold off their obsolete weapons to other fiends, such as yugoloths and hags, who then resold them throughout the Lower Planes. Although a whole group of fiends took their cut in the middle, the devils still made a fortune.
After all, from the devils' perspective, all they had traded away was some metal, while what they received were real, tangible souls!
As for those fiends getting rich alongside them, the devils might have been displeased, but they could only turn a blind eye. They had wanted to cut out the other fiends and sell directly, but demons would never allow it.
Not every demon failed to see the danger in devils earning vast numbers of souls from them every year. After all, in the Lower Planes, souls represented everything. Devils were growing stronger by the day, and that was hardly good news for demons.
The Blood War was, on one hand, a clash between order and chaos. On the other hand, was it not also a battlefield where devils and demons fought over territory?
Demons hoped to utterly defeat the devils, transform the Nine Hells, and bring down the multiverse's first line of defense against