The Vault of Secrets
From benscondo.wiki-rpg.com
The Gimra Brothers (9) were considered the greatest craftsmen in forging fortifications/holds/vaults. Karak Ungarn comissioned one of the brothers to construct a vault. All the brothers got together and decided to make this vault one of their greatest masterpieces- a secure vault, to become known as The Vault of Secrets, to hold the most treasured things of the realm. This vault possessed numerous safeguards to open, including a key. This key Iyi stole, and the dwarves are now locked out of their greatest vault. Dwarves are said to occasionally visit the black gates to the Vault and simply break down weeping or become catatonic.