This mark is granted by a random mob called the mask man. He may appear just about anywhere all over Alyria. You will need to have a mask on or be shifted at this event to get the mark. Any kind of mask works.
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A masked man darts out from the shadows, and runs past you, disappearing as quickly as he appeared. For hiding your identity so effectively, the Powers have granted thee a Mark. You have been granted the Mark of Anonymity! You gain 45 practices!