Valstahd Mine

A large, almost ancient underground structure in the northern part of the dwarven city of Del Gohrum. The mine's vast veins of various precious metals are the primary sources of income for the city.

The mine is worked primarily by The Unseen at the bottom of the caste system and is managed by members of higher castes.

Hidden Oubliette
As the party discovered, the mine also doubled as a prison for the Tome of the Deceived, one of the volumes of the doomed trilogy. The book itself was kept in a stone chamber inside of an anti-magic field to keep it from changing form into Kallista, the tiefling avatar of the book.

During an encounter with Lady Dahlia who had been trying to free the volume, the party defeated Kallista rendering the book inert for a short time until they could secure it once more inside The Silent Keep.