I have been on the raid 3 times today and two other times this week. I do not know if this is the way things go in raids, but I haven't gotten anything from chests or fallen bosses from the raid for the past 5 fresh completions. Not moldering shards, not motes of light, and not even wormspore. I dont know what I can do.
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Note that you can only receive rewards from a raid checkpoint, once per character per difficulty per week.