Ultima 8's infamous Cheat Room

While in the Tenebrae Library, you came across an Adventurer's book (Adventure Quarterly, Vol IX) that tells of The Forgotten Riches of Knarl. Knarl was a great city of trade and was the origin of many magical weapons and spells. It is rumored that it was sealed away by magic. There are many supposed locations of the lost city, but all agree that the entrance to it lies in the Lower Catacombs. It is said that only he who is sound of heart and steady of sword will find this passage and bathe in all its glory.