@LewisP20 it's equipped on your outfit tab of your character. To remove it just open your character window using c or clicking on the little blue guy in the top right of your screen, then go to the outfit tab and drag and drop it into your bag.
@Saific Did you get the request to go kill the Crab King? You need to get the request, defeat him, and then go back and talk to the person who requested it. If you did all that and it didn't work try refreshing the page after you log out.
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