Dis
The second of the Nine Hells was named Dis. Green clouds covered this circle's sky, and powerful lightning cursed through them. The earth had endless rivers of lava that covered the entire layer.
The most impressive thing about the second circle of Baator was the fact that, despite having a size comparable to a High World, it was once covered in its entirety by one single city.
The legendary Iron City of Dis was one of the two cores of Baator, along with Nessus, the home of Asmodeus.
The Iron Duke, A powerful Rank 9 Archdevil, controlled the city. It was thanks to his might and cunningness that the Iron City of Dis rose to prominence.
In the entire universe, the Iron City was believed to be an eternal bastion of the devils that no one could ever destroy due to its impregnable defense.