Okay so I am trying to get a really high grimoire and i wrote down a list of all the cards I need except for the ones that require getting a certain exotic so if anybody knows how to get some of these post below and thanks in advance!
Guardian Abilities
Combined arms:
I have played combined arms multiple times and it says I don't have it
Doubles
Skyshock:
I have played skyshock, and even watched the grimoire pop, but it says I still need it
Mercury
I am missing 2 in exalted hive but I don't know what they are
Slap Grenade
Siege Dancers
Projection Rifle
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Go to www.destinyghosthunter.net Put in your gamertag/platform and it'll tell you what Grimoire cards you're missing and how to find them. Awesomely useful site.