I am having the same problem. I have tried every possible scenario and have not received it. My friends all unlocked it just by completing a full game on the map in Crucible. I have tried winning, loosing, making sure no one quits in a game, and not using any exotics and have not got it yet.
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I've heard from my friends that there was a Mercury crucible map... I've never gotten that map yet and they've mentioned about the grimoire... Not sure when I'd see it lol
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Bungie needs to fix this.Im also missing the mercury card.