A Reinforced Vault                                     -      -      - 
(-------------------------------------------------)     # <---(M)---> -
                                                        -      -      -

The walls, floor and roof have been lined with a thick, dull metal -
possibly mithril or admantite - in an effort to prevent unauthorised access.
The door is sturdy and made of the same material and is kept shut by a
complex locking mechanism, impossible for probably even a master thief to
pick.