WARNING! Contains SPOILERS for Fantastic Beasts: The Secrets of Dumbledore.
Fantastic Beasts: The Secrets of Dumbledore further explored Credence's (Ezra Miller) story and it may explain Nagini's (Claudia Kim) tragic fate in the Harry Potter series. Fantastic Beasts 3 revealed Credence as Aurelius Dumbledore, Aberforth's (Richard Coyle) estranged son. But when Aberforth reunites with him, Credence is already dying because of his Obscurus curse. Credence leaves Grindelwald (Mads Mikkelsen) and joins his family, albeit for a very short time, and his friend Nagini is bound to visit before he dies.
The end of Fantastic Beasts: The Crimes of Grindelwald saw Credence leave Nagini in Paris and join Grindelwald in a desperate attempt to find a sense of belonging. Nagini didn't appear in Fantastic Beasts 3 — most likely because of Claudia Kim's pregnancy amidst the Covid-19 pandemic, but this also makes sense in-universe, as she couldn't have come close to Grindelwald without putting herself in grave danger. Furthermore, it's likely Nagini felt abandoned by Credence — after all, they had escaped the circus together and were each other's closest friends when Grindelwald manipulated Credence into coming with him. However, at the end of Fantastic Beasts 3, Credence reunites with his father and goes home with him, albeit in a very weak state.
Related: Fantastic Beasts 3’s Credence Twist Explained: How It Fits Harry Potter Canon
If Nagini wants to see her friend again (now that he's in a peaceful place), she will have to be quick, given Credence is dying. It's likely Nagini will find Credence in Fantastic Beasts 4, and she will try to find a cure for his Obscurus curse — as a Maledictus, she knows the tragedy of a lifelong curse and
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