Each campaign/raid you begin will have potential treasure items in it (orbs, equipment, elixirs, fury), and you will be shown which ones in a message before you start each campaign/raid. Also you can pay attention to the drop rate of a certain item. As pointed before you start it is random with the placement of these items so you may have to complete a raid many times before you finally get them. Completing a storyline will complete the campaign and earn you additional experience, gold, and possibly treasures.
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