20 mouldering shards gives you something extra from the loot table, 2 mouldering shards is in that loot table. You just had a rough roll of the dice bud.
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I know so technically I didn't get an extra reward right?
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Well yes, but you're not guaranteed a drop. The reason everyone thought you get double rewards is because you're guaranteed a weapon the first time you defeat oryx, but any time after that you could possibly receive nothing. But 20 mouldering shards always gives you something, so you really just got the lowest amount of rewards possible