Before you plan your step ouline, you need to have a handle on four things:
a) The Hero's Four Core Challenges: Inner, Outer, Romantic, Greater Antagonism.
b) The Transformation that you want to push your Hero and Allies through.
c) The Journey that will push the Hero and Allies through that Transformation.
d) The Four Catharses that will end your story.
Then you need to push the Hero along the path of the Hero's Journey / Transformation in an almost linear way in order to resolve the Four Core Challenges and then bring the story to a close with your Multiple Catharses. This is the tricky bit- for you need to understand each stage of the Hero's Journey / Transformation in order to push your characters through it.
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