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A WindClan warrior named Mothflight discovered the Moonstone while in exile. She became the first medicine cat because of this discovery and led the other four Clans to have medicine cats as well. Here is a link that goes to a page with more info about the moonstone

(It's part of this warriors wiki)

When she discovered it she was called Moth Flight. Jayfeather 16:46, May 20, 2016 (UTC)

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