I swear yesterday when I was on my hunter and trying to get him through rise if irons campaign, my grimoire was 5005 but now it's 4995 and idk if I just messed up somehow and saw the wrong numbers or if something changed or what.
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Siva clusters are not account wide, meaning if you collected siva clusters on your main and achieved a GS of 5000 your secondary character will still have only 4500. Hopefully that helps clear things up.