Do we know if Horcruxes will make an appearance in the Fantastic Beasts series?
Did J.K. Rowling ever mention anything about Grindelwald and Horcruxes?
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The only time J.K. Rowling mentioned a wizard other than the Dark Lord having Horcruxes was when she’d said Herpo the Foul created the first one. She’s never said any other specific named wizard other than either the Dark Lord or Herpo had attempted to make a Horcrux, and she’s never said anything specific either way about if Grindelwald had any Horcruxes at any point.
SU: Oh, Jo, but those "horcruxes", though, I tell you, they're so much to ask still about those, you know?... I mean, who, okay, we have to know. Who created the first Horcrux? Was it Grindelwald? Salazar? Who did that?
JKR: D'you know what, I've got a feeling it was Herpo, which is H-E-R-P-O.
SU: Herpo the Foul?
JKR: ... Herpo the Foul, exactly, yeah. Yeah. But you know wizards would've been looking for ways to do exactly what Voldemort did for years, and some of the ways they would've tried would've killed them, so I imagine it... well, there's huge parallels. Splitting the atom would be a very good parallel in our world. Something that people imagined might be able to be done, but couldn't quite bring it off, and then... and then people started doing it with sometimes catastrophic effects. So that's how I see the Horcrux.
- PotterCast Interview, (December 17th, 2007)
Grindelwald is mentioned in the question she’s asked, but she doesn’t say anything about him possibly having made a Horcrux, or say anything about whether or not she thinks he would have. Although someone mentioned him, Rowling says nothing about Grindelwald and Horcruxes in this interview, and she says nothing further in other interviews.