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The question is complex, but important.
When I played through the campaigns, I chose different paths for the heroes; for some, I chose paths that fit, and for others, not. I did it for fun. Now, I've completed all the campaigns, and in the Dynasty, the heroes have their original classes and paths (mage/warrior, evil/good). Is there a way to change this for duels, like replaying the campaign or editing something in the files? I'm interested in the opinion of those who definitely know.
Create a new hero and play through the campaign with him; you'll also improve the Dynasty's weapons.