Nidal is one of the oldest surviving countries in Avistan, having been founded during the uncounted years of the Age of Darkness. Even though it is now beholden to the neighboring infernal realm of Cheliax, it retains significant autonomy to pursue its own shadowy goals.
The dwindiling ruling class shares equal responsibility of governance with the Priesthood of Zon Kuthon. Both factions need the other and are generally respectful of each others ancient rights. It is obvious their ways are quite different at times though.