Firstly, this is a simple step-by-step guide to help new players/players who do not know how to sell their items etc.

Step 1: Go to the world map.
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Step 2: Click on "Traveler's Outpost"
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Step 3: Enter the map.
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Now walk to where I am in the picture. Note: My IGN is "Lazy" there.
Now, click on the man in front of you(the guy with a hammer on top of his head).
You should see something like this.

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And you may proceed to auction/sell your items away.

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Have fun auctioning!

Now I will show you guys where the other auction place is located at.

Step 1: Go to the world map again.

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Step 2: Click on the "Great City of Kraag"

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Step 3:Now enter it. Now to reach the auction site there. As soon as you enter the city. Turn left. And turn left again.
You should see something like this.

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Thanks for reading! Hope this guide has helped you.