Last Fantastic Beasts 2 Trailer Features A Major Harry Potter Twist

The final trailer for Fantastic Beasts: The Crimes of Grindelwald features quite a major character reveal, one which has sent shockwaves through the Harry Potter fandom.

According to J. K. Rowling, it's been 20 years in the making, but fans are divided on the news.

Nagini, Lord Voldemort's loyal pet snake and final Horcrux is revealed to be doing just fine in the Fantastic Beasts sequel. She's also apparently a human who takes snake form.

It was a major secret, one that a lot of fans didn't see coming, considering Nagini's major role in the original Harry Potter world. According to the film's official Twitter account, Nagini is a Maledictus -- a human who is cursed to slowly turn into an animal.

That means that by the time a high school student cuts her head off with a sword (really changes your opinion about Neville, doesn't it), she wasn't so much a human in snake form as she was once a human who transformed entirely into a snake.

According to the actress playing Nagini -- Chloe Kim -- hers is a character that is going through many transformations, not just the slithery kind.

"It will be so interesting to see another side of Nagini," she told Entertainment Weekly. "You’ve only seen her as a Horcrux. In this, she’s a wonderful and vulnerable woman who wants to live. She wants to stay a human being and I think that’s a wonderful contrast to the character."

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According to Kim, Nagini still has the ability to change at will during Fantastic Beasts 2, but by the time we meet her in the Potterverse, she's become a snake permanently.

The blood curse is passed down from mother to daughter and -- according to Rowling -- a Maledictus can only be a woman.

That's not all Rowling revealed. She also tweeted that this huge twist wasn't something that she had just come up with.

Rowling was on a tweeting-spree around the release of the trailer, promising more shocks and surprises, but the Nagini reveal was one that really took fans by surprise.

There were also the awkward realisations that... some of the events in Harry Potter become quite dark when you remember she used to be a woman.

Fantastic Beasts: The Crimes of Grindelwald  hits cinemas November 17.

Featured image: Warner Bros. Pictures.