“Well, when it works correctly, It conjures up a Patronus,” said Lupin, “which is a kind of anti-Dementor — a guardian that acts as a shield between you and the Dementor.”

“Full of Dark Magic?” he repeated mildly. “Do you really think so, Severus? It looks to me as though it is merely a piece of parchment that insults anybody who reads it. Childish, but surely not dangerous? I imagine Harry got it from a joke shop —”

“No, Ron,” said Lupin. “Two of you.”

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