Khác biệt giữa bản sửa đổi của “Muggles' Guide to Harry Potter/Magic/Expecto Patronum”

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{{Muggles' Guide to Harry Potter/Beginner Spoiler}}
 
''"That's very, very advanced magic ..."'' - Hermione Granger on the difficulty and complexity of the charm
 
 
[[Muggles' Guide to Harry Potter/Characters/Harry Potter|Harry]] learns this spell from [[Muggles' Guide to Harry Potter/Characters/Remus Lupin|Remus Lupin]] in [[Muggles' Guide to Harry Potter/Books/Prisoner of Azkaban/Chapter 12|''Harry Potter and the Prisoner of Azkaban'']]. Harry's ability to cast a corporeal Patronus in his third year of magical studies shows his ability as a wizard, as it is a very advanced spell which is thought to be too difficult for underage wizards, in fact the vast majority of witches and wizards are unable to produce any form of Patronus. In his fifth year, when Harry takes his [[Muggles' Guide to Harry Potter/Major Events/OWL exams|OWLs]], his [[Muggles' Guide to Harry Potter/Magic/Charms|Charms]] examiner offers him an extra point if he can produce a corporeal Patronus. A point, or a letter grade, would be worth about 15% of his total marks, so achieving this one charm is seen as quite valuable.