You see a mimic
Notes
They are shape shifters. Legends say they shapeshift into items that are of your inner-most desire. They were summonable for a short period.
Abilities
Shapeshift
Damage Taken From Elements
Physical 
Death 
Holy 
Ice 
Fire
Energy
Earth
Location
Third dream in the Dream Realm
Behaviour
Keeps moving around shapeshifting.
Strategy
They don't attack and you can't kill them either, so simply just watch them or ignore them.