in reply to At the end of the quest, I would hate to face:
You can't kill map in a void context, it has no explicit goal. Everything you do with map in void context is for the side effects, kind of like cloning yourself to get a heart transplant (and can you wait that long?).
Otherwise, I think the most dramatic is Sauron. How do you fight with an all-seeing eye that has no physical manifiestation? Sure, throw the hobbit^WGolem into the volcano, but what really happened there? If energy has a will, wouldn't it put itself back together again? (Which somehow reminds me of the "there's only one electron" idea -- how to distinguish one electron from another, or any quantum of energy from it's brethren?)
Quantum Mechanics: The dreams stuff is made of