Geophoria

Geophoria is a naturally occurring stone found deep in the Underdark, it is by all means a magical power source capable of a great many things and is incredibly useful in the various technologies of Hir. However, it is also incredibly rare due to this fact making it an expensive commodity. Therefore a large amount of buissness and crime revolves around Geophoria trade.
Of the things Geophoria has made the most simple is powering Magical mechanics, these being things such as Warforged, Golems and railcarts in the Dwarf Roads and Drow-ways.