A spell that makes an item or creature look totally silly
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Peskypiksi Pesternomi
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Riddikulus
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Locomotor mortis
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serpensortia
B
Correct answer
Explanation
Riddikulus is the spell used to defeat a Boggart by making it appear amusing or silly, exactly as the question describes. Peskypiksi Pesternomi is not a real spell, Locomotor Mortis is the Leg-Locker Curse, and Serpensortia conjures a snake.