In a Negative Change Arc, the Lie is about something the character already possesses but devalues (e.g., he’s already filthy rich, but he fails to value or be responsible with his blessings). There will be one specific, objectively good thing in his life that he will take for granted. Worse, he will be willing to sacrifice this good thing (and its inherent Truth) in order to pursue the false promise of the Lie.
