Water or Blood
City of Brass
Hidden beneath a mountain of through either a mystical door or some lost tomb, this mystical location has been accused of being in almost every mountain range and through a variety of famous tombs.
The city is said to be ruled by a Demon shard so opulent and fat as to be bathed in gold dust and feed a constant stream of souls.
It is said he keeps a great army of Brass constructs who police his strange realm, maintain a population of human slaves that are fed to the great demon, and while living serve his every wim.
This Demon is said to love deals but, delights is trickery and deceit, he features in many mythic quests providing knowledge that should be lost and forgotten, but he has pulled from somewhere.