The Living Wall                                        -      N      - 
(-------------------------------------------------)     W <---(M)---> E
                                                        -      S      -

The wall to the south seems more like a perverse sculputre than a wall. 
Fleshy body parts and half skeletons hang from what appears to be solid
rock.  You focus your eyes more intensely on the structure and notice that
you can see inside the wall and watch as several dozen of the castles guests
and other knights are trapped inside, being devoured slowly.  Once absorbed,
souls are lost forever, so you hold no qualm about destroying this monolith
of evil.
A grotesque wall composed of body parts is trying to prevent you from moving.
A man covered in glowing blue tattoos and oily overalls kneels before the pylon, tinkering.