It's come to my attention that following the most recent hotfix the initial Reef cutscene may unlock the House of Wolves Grimoire card. I would like to test this out, however all 3 of my characters are long finished with the story, and this mission cannot be selected from the destination menu. If anyone is at this portion of the story, or near it, could you please invite me to tag along? It would be much appreciated! UPDATE: I can 100% confirm watching the first Reef cutscene is what unlocks the House of Wolves grimoire card. I just rushed a clanmate to this point. The game does not pop up any indicator once the scene is finished, but you will notice a +10 increase to Grimoire, and the card will unlock. The pain in the ass is, if you have already done the story on all 3 characters, you will need to either delete a character and start from scratch or have a friend who is on this part lead the fireteam. To alleviate any confusion, this card was bugged and would not unlock at all until the most recent hotfix.