You know that very common, even overused, fantasy trope where magic is forbidden, and those who practice it are hunted?
You could freshen it up a bit with a tribute to these brave souls who maintained their faith in the face of oppressive laws.
https://www.atlasobscura.com/articles/secret-paths-ireland-catholic-forbidden-mass-photography
This is what real religious persecution looks like.
Great article, reminded me of the old Scarecrow movie from Disney when I was a kid. Chilling!