A low musical note sounded as an alarm by the Horned River Serpent of North America (Pm).
- When Gormlaith Gaunt attacked Ilvermorny School, she used the single Parseltongue word for "wand sleep" to make Isolt Sayre's Basilisk-horn wand inactive. But the Boot twins, Chadwick and Webster, had twin-core wands with River Serpent horns, and instead of sleeping their wands awakened and began emitting the low musical note of danger which alterted the boys (Pm).
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