Envelopes are bonuses that you get for helping friends. Every time you help a friend, you earn reputation points. When you have collected a certain number of these points, your reputation level will increase. The higher your repuatation level, the more you can help your friends. Every time you gain a reputation level, you also get more prizes for visiting your friends, and your bonus for taking advantage of help from your friends (depending on their professions) increases. You can see your profession by clicking on your name in the upper left-hand corner underneath the experience level bar.
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