- "A black blindfold appeared over Phineas Nigellus' clever, dark eyes, causing him to bump into the frame and shriek with pain."
Obscuro is the incantation of a Transfiguration spell used to conjure a blindfold over the eyes of the victim, therefore obstructing their view of their surroundings.
Hermione Granger used this spell in September of 1997 to prevent the Portrait of Phineas Nigellus Black from viewing the location of her, Ron Weasley and Harry Potter in the Forest of Dean.
Harry Potter used this spell while duelling Draco Malfoy in September, 2020.
The incantation is Latin for "dark" or "conceal".
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