Pulsating Chamber                                      -      #      - 
(-------------------------------------------------)     W <---(M)---> E
                                                        -      S      -

The stone corridor you have been following intersects another, almost
identical one here.  Tunnels lead off in the four cardinal directions.  A
door lies to the north with powerful runes of warding inscribed up and down
its sides.  A large, glowing, red, rune is inscribed above the doorway. 
Four torches hang upon the walls here the flames do not flicker like the
other torches, instead these pulsate quickly creating an effect much like a
strobe light.