
Lore wise, who is redacting the grimoire cards and why? (Destiny)
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The Office of Naval Intelligence :P
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Wait, what?
Are Grimoire cards disappearing or something?
Thanks for all the context Cody
I think some Grimoire cards have details <redacted>? But I cant remember.
Lore wise, who is redacting the grimoire cards and why?
There are cards with redactions?

The Office of Naval Intelligence :P

^This
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Thorn 3
There are cards with redactions?
Thorn 3 has some pretty big ones.

The Darkness? The Nine? /Sekhmet/?
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The Speaker? Ikora? Dinklebot?
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Great question.
I don't have an answer, but I'll post a question that may provide us a good guess.
Who Provides us with the Grimoire information?
If it's the Tower Library, I'd say The Speaker or a predecessor is/was doing it.
If it's a summary of information we gather in the wild, the source of any redaction is probably the entity that put the information out there.
When I read the grimoire cards I sort of assumed they were a mix of information that we ourselves figured out, information from our Ghost, and some sort of archive library. There are even some that read more like stories you'd hear in the tower bar.

All depends on the time
In the cards from pre-fall, it is military intelligence. In more recent "history", I would imagine it is the agents of the Tower.
"In the City's earliest days, various factions vied for the hearts and minds of the refugee masses. Power struggles threatened to shatter an already tenuous existence.
The following conflicts, known as the Faction Wars, brought the City to its knees. When the chaos grew intolerable, a gathering of Guardians fought to end the conflict. The new peace brought a new order: the City Consensus and the Speaker ruled together, and the surviving great factions worked through civil channels to pursue their agendas.
That order still holds, but as the City reaches out into the frontier, the factions see new opportunities everywhere - and a chance to win over Guardians to their cause."
The city is riven by factions. Factions that from the spotty lore have come to blows several times, such that the Vanguard have banished several of them in the past.
These factions hold secrets, such as the FWC's attempts to divine a future timeline where humanity triumphs, or Dead Orbit's fleet size and location. The Vanguard, and by extension the Tower, must have agents attempting to ferret out these secrets in order to keep control. Ikora's Hidden are probably only one group. There are most certainly others, guardian or not, that watch the comings and goings and infiltrate the various groups at their master's behest.
We have never met the representatives of "the consensus", the masters of the city. We have vague hits from the New Monarchy cards that they are a somewhat democratic body, but nothing concrete. With humanity on the edge of survival, the consensus is undoubtedly primarily concerned with the day to day trials of feeding and sheltering the city. They cannot ignore the supermen next door however, and also probably have an organization shadowing the Vanguard to ensure any other Dregden Yorrs are eliminated quietly before things get out of hand.

Nailed it. Answer: could be anybody.
My bet's on The Speaker, but since we don't know from where these come, IDK if we can know who's losing the info.
Great question.
If it's the Tower Library, I'd say The Speaker or a predecessor is/was doing it.
I would wager this if the rumors about the original story with respect to the Speaker are true.
Also, HI BATTUTA!