Merry's horn. The description points quite clearly at the magic being in the horn, not the blower.
Quote:
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...and wrights had engraven upon it swift horsemen riding in a line that wound about it from the tip to the mouth; and there were set runes of great virtue. --- "He that blows it at need shall set fear in the hearts of his enemies and joy in the hearts of his friends, and they shall hear him and come to him."
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