The old capital of the Arch-Duchy, now known as Aerduin’s Folly, has laid abandoned for nearly 50 years, covered in a layer of ash and dust generated by its destruction at the hands of Razmir. In the years since, not a thing has grown here, with the earth itself turning into a coarse gray ash. Worse still, it has become a haven for undead. While many are the spirits of the people of Aerduin, there are rumors that a powerful skeleton lord moved to the ruins a few years ago, and that he has been creating other undead from the ashes. Some say it is actually the vengeful bones of Duke Melcat, returned to claim his throne. Despite all of this, adventurers still occasionally explore the ruins. While many are never heard from again, some return with tales of fabulous wealth that lays completely unguarded in crumbling vaults under layers of ash.
Sources: Pathfinder Chronicles Campaign Setting