Gretr Road

The Gretr Road is an ancient Underdark highway conjoining the surface near Iron Town and the duergar city of Gretretka. Historically maintained by the duergar, the Road has recently fallen into disrepair.

It's unclear where the Gretr Road came from. An ancient engineering project? A mighty wyrm? An alien aberration? Whatever the source, traders made good use of the Road until recently.