A Very Hot Chamber                                     -      N      - 
(-------------------------------------------------)     - <---(M)---> -
                                                        -      S      -

After walking through the cramped tunnels of the mountain for so long,
this chamber seems even more massive than it actually is.  It rises at least
a hundred feet above your head, and the other side of its ceiling must form
the ground at the top of the mountain.  There is a large, dome-like
structure in the center of the room, reaching all the way to the top of the
chamber.  The rocky walls of the dome glow a dim red, and you imagine that
whatever is inside must be incredibly hot.