J.K. Rowling's new Pottermore story about the American Wizarding World had a lot of Harry Potter fans excited, but it upset plenty, too.

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In the first installment of the four-part series, Rowling introduces readers to the earliest wizards and witches in North America: Native Americans skilled in animal and plant magic, who don't need wands to conjure spells. Rowling also describes skin walkers (which, according to some Native beliefs, are people who can transform into animals at will) as Native American Animagi — fictional beings of her own creation. She also includes medicine men in her narrative.

BuzzFeed News has reached out to a representative for Rowling for a comment.