With the memory obtained, 2 new ghosts can be interacted with to receive items. They are located within the War room and near the Shadow dial.
If lost or destroyed, a new copy can be obtained from the bookcase in your Player-Owned House made through Construction.
Below is the text you can read from within the book.
The vault is hidden in shadow, an unfortunate side effect of which is that I too am stuck within it. I know that I should enter a state of stasis, so as to preserve my power in case this location is discovered. If I am not strong enough to defend this place's secrets, then what was any of this for? And yet my nature is one of inquisitiveness - in part, a reason I was chosen as a praetorian - and I find myself with an opportunity to delve deeper into the Shadow Realm than any before me. Perhaps even deeper than Sliske himself, the self-proclaimed 'Master of Shadow'. I shall note down my methods and findings here, should I not survive long enough to pass on this information.
This Data was submitted by: ChathMurrpau
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