Here's the concise summary of everything your average adventurer needs to know about the Kingdom of Blackwater in 723AS:
They use a silver standard for coinage. Their main exports of interest to anyone else are cattle, horses, linen, dragonbone, magical toxic waste, ancient relics, gold, and murder hobos. You mainly want to steal the gold, relics, dragonbone and magical toxic waste. They speak Wyvish, as do the hippies (Upper Wyvs), weirdos (Lower Wyvs), conans (Ulthendish) and the folks in the factory city to the east (Marlechers) but they all sound silly when they do. Their government has nobles and stuff, but mainly exists to extract taxes. There`s two kings, one`s a lich, and they hate one another and are gearing up for a big war. They have good scientists, wizards and engineers, but they all leave to go get rich elsewhere, unless they`re evil and want the magical toxic waste for themselves. Everything's poor as hell and most people look like refugees from some Byzantine province (Armenia or Pontus or Trebizond). Summers are cool and dry, as are winters. Blackwater used to be run by the hippies and weirdos hundreds of years ago, until they summoned too many demons or something and went back to their island to be crazy by themselves.