Runed Hallway                                          -      N      - 
(-------------------------------------------------)     - <---(M)---> E
                                                        -      -      -

The walls of this tunnel are decorated with a variety of strange symbols,
none of which look at all familiar.  The runes seem to pulse with a dim red
light if you stare at them long enough, but you decide that it must be an
optical illusion of some kind.  You can hear a low chanting from the end of
the tunnel, but are unable to determine how far away its source is.