Obisidian Tunnel                                       -      N      - 
(-------------------------------------------------)     - <---(M)---> -
                                                        -      S      -

  This tunnel is composed entirely of obisidan.  The walls are completely
smooth and have a shiny gloss to them.  You can see your reflection on them,
but notice there are slight differences.  Your reflection seems to be
grinning maliciously at you.  You hurry down the tunnel unsure of what you
just saw.