Out Of The Abyss
Gracklstugh is a city of duergar (also known as gray dwarves).
Buppido has suggested returning here to obtain better equipment and a path to the surface.
Jimjar has suggested that the gray dwarves have a penchant for slaving, so maybe escaping from one slave outpost to head towards a city of slavers is unwise.
Either way, Buppido can navigate to this place from the Darklake.