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The Cuarto Llave is Spanish for "Fourth Key". It is in the form of a torn piece of sailcloth. The item was originally used by the Benevolent Lodge of Mystery, a mystery solving group in the 1800s.
Scooby-Doo! Mystery Incoporated
- Scooby-Doo! Mystery Incorporated
- Like the other keys, the frozen scene associates it with a Greek element, in this case air.