Like the text says. For the last week of the the Taken King Bungie should make the raid have all three challenge modes at once. Maybe even make all 3 challenge modes utilize the moldering shards for even more loot.
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I hope they do that. For some us newer players it's hard to get any team to do the raids. Not alone challenges. It took over 75 retrys just to get the raid done once. It give us a chance to get all the calcified.