OK SO ITS THEORY AND CONCLUSION TIME I GUESS.
IF IT IS INDEED STILL TIED BY ANY OF ITS FORMER BOUNDARY'S THEN FLIGHT IS NOT POSSIBLE AS IT NEEDS TO BE CAST, SO THEREFORE THERE MUST ALSO BE LIGHT.
WITH THIS IN PLACE WE MUST ALSO CONSIDER ITS STRENGTHS,
THERE IS NO PHYSICAL PRESENCE, SO PHYSICAL TRAPS HAVE NO EFFECT. WATER WILL BE A MASSIVE ADVANTAGE TO IT AS IT CAN MOVE DOWN THROUGH ITS LAYERS WHERE AS WE CAN NOT.
WEAKNESS IS DARKNESS, BUT IT MUST BE PITCH BLACK. SO IF YOU INTEND ON USING THE NIGHT AS A WEAPON IT WOULD HAVE TO BE AT NEW MOON AND OVERCAST. CAVES ARE A MORE PROBABLE ANSWER AS NATURAL LIGHT IS BEING REMOVED.
YOUR SHADOW SEEMS TO PREFER FEMALES (AS I EXPECT YOU DO ) AND GOES FOR THOSE WITH A HIGH EMOTIONAL BASE, BUT NOT NECISSARILY IN ANY SET EMOTION.
THE SHADOW DOES SEEM TO HAVE THE SAME EFFECT, CAUSING AGGRESSION, MISTRUST AND CONFUSION. UNFORTUNATELY IT ONLY GETS STRONGER WITH EACH TARGET.
THE ANSWER WOULD BE TO LURE IT INTO A CAVE LIT WITH MIRRORS (INDIANA JONES STYLE) AND TORCHES, MAKING IT VERY BRIGHT. YOU NEED TO BE AT THE FAR END OF THAT CAVE. AS IT VENTURES ALONG IT WE EXTINGUISH THE FIRST FEW TORCHES AND THEN TURN THE FIRST MIRROR. THIS MEANS THAT ALL LIGHT WILL BE GONE, EXCEPT THAT CAST BY THE FINAL FEW TORCHES. YOU CAN THEN PUT THEM OUT ONE BY ONE UNTIL THE LAST. ITS ONLY CHANCE OF LEAVING THE CAVE AT THAT POINT IS TO REALIGN ITSELF WITH YOU BEFORE YOU PUT OUT THE LAST TORCH, SO YOU CAN CAST IT AGAIN AS YOU LEAVE.
SO FOR THE 3 ITEMS, YOU WILL NEED 2 MIRRORS (MORE WOULD HAVE BEEN PREFERABLE) AND A PLANK TO SPLIT INTO TORCHES.
IF MIRRORS COUNT AS ONE I WOULD ALSO ADD TWINE/RAG, FOR THE TOP OF THE TORCHES