i was playing Crota´s Raid with some friends... we killed crota...
when we kill him, it drops me a Thonderlord, finally i proceed to check out my new wepon and it wasn´t in there, i wait for the final Score drop... it appers me the thonderlord drop and check back again... it wasn´t there
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When the Thunderlord was awarded you would have also received the Grimorie Card for it. As you don't have that card, you were not awarded the gun.