On The Path of the Abyssal Isopod                      NW     -     NE 
(-------------------------------------------------)     - <---(M)---> -
                                                        -      S      -

For centuries, adherents to Ithrilis have attempted to dredge deeper and
deeper on the ocean bottom, looking for creatures blessed by their deity. 
Sometimes, they actually succeed.  One such success waits at the end of this
chamber, fed dozens of pounds of meat to satiate its appetite.  With it
thoroughly stuffed, visitors to the shrine can be safe in its large, angry
presence.  Its clicking legs are already audible.