Once, long ago, all of dwarf civilization was united in a grand community. Dwarves occasionally set out from the Mountainhome to found new settlements, called Fortresses.
*Warforged, Gondsmen, and the engines for creating them. Warforged are nearly mindless machines that are effective one or perhaps two areas of expertise, but not very flexible. Gondsmen are sometimes superficially similar to warforged, but for reasons not entirely understood, gifted with awareness and intelligence.