From the Super Mario Wiki, the Mario encyclopedia
S'crow Bell is a status magic attack used by the Sling Shy and Carroboscis in Super Mario RPG: Legend of the Seven Stars. A large bell appears over the party member, rings, and drops music notes on them. The bell disappears, and the party member becomes a Scarecrow, hence the name of the attack. This can be avoided completely if the party member is wearing a Trueform Pin, which prevents turning into a Scarecrow or a Mushroom.
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