The Bungie Crew did an amazing job with the stories on the Grimoire Cards. At first I didn't really care about them and kind of pawned them off as a just little achievements that I could earn in game, but they are so much more than that. The Grimoire Cards are filled with history, myths, and knowledge that you could get lost in, imagine, and truly feel. I've read quite a few of the Cards that I've earned, but only a fraction of the total.
They're are so many great stories and so far my favorite one is:
[u]Ghost Fragment: Fallen[/u]
Check them out.
You won't be disappointed.
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I hate the Grimoire card system. It's not in game. Difficult to navigate, clicking in between them and flipping them over to read a paragraph or two is a terrible mechanic (it may be better on a tablet or smartphone but I HATE the computer navigation). They're mostly too vague and too short. They provide minimal story and are occationally way too cryptic or just flat out unhelpful. It works for some people but just not me. PS - Forum navigation sucks even more.