So I did all 3 challenge modes each on hard the first weeks they came out, but I THINK I'm missing a calcified fragment/book of sorrow grimoire.
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http://destinycalcifiedfragments.com Double check you character's fragment count at the Dreadnaught destination window and makes sure you have 49/50.
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Have you done tier 2&3 Court of oryx? And the little quest?
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You are missing Fragment 32 which is on a ledge just past the golgoroth encounter.