Have they not considered anything like this? Instead of the grimoire system from D1, why not have a “Loremaster” or Librarian at the tower in which you can unlock and view events? A timeline. Some would be simply for completing things and would unlock all associated lore, others could be secrets discovered from scanning things in the environment.
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Lol. They left her at the farm by herself. Tyra Karn is an immortal “student of history.” Oh, and she lost her memory when she lost her light. Why? Because they needed a cryptarch at the farm and because Bungie probably has the worst narrative team ever.