https://twitter.com/cgbarrett/status/951146757588582400
Well... this could be a cool thing. As long as there is grimoire in game in a terminal or codex in the menus. This is a ... nice sign. I think that is a thing many of us miss from D1 but just hated the fact we had to read the fantastic lore on Bungie.net instead of the game.
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Yes you will be able to find / buy them in the Eververse store...