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Grindelwald used Transfiguration (specifically Human Transfiguration) to disguise himself as Percival Graves. Although producer David Heyman initially stated in interviews that it was Polyjuice Potion, J.K. Rowling later clarified on her website that Grindelwald's immense power allowed him to use a spell rather than a potion. In the film, the disguise is removed instantly when Newt Scamander casts the Revelio charm.
Grindelwald used Transfiguration to become Percival Graves in Fantastic Beasts and Where to Find Them (2016).
He was impersonating Graves, who was a high-ranking employee of MACUSA (Magical Congress of the United States of America) and the Director of Magical Security.
The film's climactic reveal shows that when Graves is subdued by MACUSA Aurors, he is not forced to drink an antidote to reveal his true form (as would happen with Polyjuice Potion). Instead, the charm/Transfiguration is forcefully broken or worn away, revealing Gellert Grindelwald underneath. Polyjuice Potion is a temporary magical brew that requires a part of the person being impersonated and wears off after a set time, requiring the imbiber to physically drink it. Transfiguration is a direct magical alteration performed by a powerful wizard, which aligns with Grindelwald's capabilities and the sudden nature of the reveal.
The summary is correct, but it omits the fact that producer David Heyman initially stated in interviews that Grindelwald *did* use Polyjuice Potion. J.K. Rowling later overruled this in a FAQ, which is why the topic is often debated by fans.
The summary mentions the charm is 'forcefully broken' but does not name the specific spell Newt uses: 'Revelio'.