The Mystic Tinkerer

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Adventurers from across the land seek the infamous mystic jewel crafter. The tinkerer is known for producing magically imbued trinkets which aid the adventurers in their journeys. But as a cost for the services, the adventurer must sign a contract to bring back a rare or unique treasure/artifact, which the tinkerer is strangely specific about it and its location. The tinkerer is always traveling and is accompanied by a pack mule pulling a cart full of goods and wonders.