One critical yet often misunderstood aspect of the Hero's journey is the mapping of the Hero's Challenges onto it - every good and successful story has a Hero with [at least] Four Core Challenges.
One significance of the Ultimate Boon is that it is the Reward associated with the conquest of the Inner Challenge - this Reward is separate and distinct from the earlier and other Rewards that make up the Journey.
The Ultimate Boon is where the Hero et al have overcome their Inner Challenges and are no longer hindered by them - that is why this is a stage where the Hero completes requirements with ease, there is no delay and obstacles are overcome with ease. This is the source of the Hero's confidence from hereon in - s/he has overcome the deeper psychological challenge.
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