The Diarchy of Stone Rift is a mountain dwarf kingdom in the Western Southlands of Erenoth. The kingdom consists of a large city built within the walls of a massive canyon, with a handful of outlying settlements and outposts.
Stone Rift is also unique in that it has at all times two kings, rather than one. A King of the Toil (responsible for overseeing the kingdom's commerce and industry) and a King of the March (responsible for commanding the kingdom's military). The current King of the March is Balrok Hornhelm. The throne of the King of the Toil sits empty following the execution of the traitor Nosmir Stormhammer.
Stone Rift is unique in its utilization of lightning. The city is plagued by near-constant lightning storms (some legends say it was the lightning that carved the canyon; others pose that it was a primordial of thunder), and the dwarves have become quite adept at collecting and harnessing the lightning energy in everything from electric lamps to thunder-infused weaponry.