Walking on Unholy Ground                               -      N      - 
(-------------------------------------------------)     - <---(M)---> #
                                                        -      S      -

Steam and eldritch vapors rise from the soft ground in this seemingly
outdoors section of the castle, although you know for a fact that you
haven't stepped outside.  There must be some powerful illusion at work here.
An unholy aura radiates darkness throughout the area.  On the bones of an
unfortunate adventurer is carved a message, perhaps it can prevent what
happened to him from happening to you.  Maybe you should read the message.