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Does anyone know anything of the Emerald Glorfindel left in the mud on the Last Bridge for Aragorn to find? Is it of any historical importance?
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It was a basically <just> an elf gem. Glorfindel left it on the bridge to serve a double purpose. First, as was previously mentioned, as a signal to let Aragorn know that way was safe, and secondly to keep the path safe. The stone had been bestowed with some sort of magical elven "virtue" so to speek. The ring wraiths would have been repealed by it would have kept a safe distance from it. Glorfindel assumably left several such stones in different paths he thought Aragorn would have tried to take to protect them.