Hammergrim
Hammergrim is a divine dominion connected to Acheron in the World Tree cosmology of the Forgotten Realms. As you might have guessed from its name and connections, it is the home of the duergar gods Laduguer and Deep Duerra. Weirdly, Urdlen, the Chaotic Evil gnome god, also hangs out here, although nobody is really sure why. For whatever reason, the normally smite-happy dark dwarven gods are willing to ignore this pest burrowing in their proverbial backyard.