A potion that can give the drinker the appearance of another person.
‘Did you get them?’ Hermione asked breathlessly. Harry showed her Goyle’s hair. ‘Good. And I sneaked these spare robes out of the laundry...
Harry Potter and the Chamber of Secrets
by J.K. Rowling
‘Hermione?’ ‘Hm?’ ‘I’ve been thinking. I – I want to go to Godric’s Hollow.’ She looked up at him but her eyes were unfocused and he was...
Harry Potter and the Deathly Hallows
By J.K. Rowling