Why is my grimoire different on each character? I'm at 5415 on my Hunter, but it's lower on my titan and warlock.
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It's because of the Siva clusters, it's a known bug.
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I believe it's either the ghosts or the hidden siva things (maybe both) in RoI are character based and not account based now. Bungie gave an update about how if you delete a character, the grimoire you obtained with them will drop, so until they patch it, certain grimoire is going to be character-based.