At least some content in this article is derived from information featured in Harry Potter: Hogwarts Mystery. Spoilers will be present within the article.
During the 1989–1990 school year at Hogwarts School of Witchcraft and Wizardry, Bill Weasley taught this spell to sixth year students in Defence Against the Dark Arts class, as part of his extracurricular classes in the subject.
- Harry Potter and the Half-Blood Prince (First mentioned)
- Harry Potter: Hogwarts Mystery (First appearance)
Notes and references