The Mountain Dwarves are a secretive and wary people. Their only home, a vast underground kingdom, is their best kept secret, for the location is not commonly known to a non-mountain dwarf.
The Dwarves long ago had many kingdoms, in the days of the Duanda. While the Duanda ruled the earth, sky, and sea, the dwarves ruled the caves, chasms, and dark places of the world. Something happened, however, and there was a large war between the kingdoms that was devastating. Today this war is said to be what caused the schism; the dwarves that went above ground became the Hill Dwarves, those that were driven further down became the Deep Dwarves, and those who held the last of the old kingdoms became the Mountain Dwarves.