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Purchase Luck item ticket and click on the "Use" button
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Go to Elbeland and find out David
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Talk to David and click on the "Exchange" button
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Put Lucky Item Ticket and click on the combination button
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Click on the "Refine Lucky Item" button
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Put any items in order to create Jewel of Extension
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Click the on combination button
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Obtain Jewel of Extension at certain rate
This process can be failed at a certain rate
Jewel of Extension is used for increasing durability of Lucky items
Put Jewel of Extension of the items you want to fix