Outer Challenge and Inner Challenge are better terms.
Defeating the antagonist is a measure indicating that both can be satisfied. That no obstacle to their resolution exists. That they can now be effortlessly attained.
In The Lord of the Rings: The Return of the King (2003), once Sauron is defeated, there is no obstacle to Aragorn becoming king and the union with Arwen.
In The Lion, the Witch and the Wardrobe (2005), once the White Witch is defeated, there is no obstacle to summer in Narnia and the siblings getting along happily.
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