The Tome of Forbidden Knowledge
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Some time ago, Igrezor came into possession of a tome locked behind layers of wards and bearing an usual warning. The book is barred from access by a powerful ward, one that uses old magic and warnings in Netherese. I recommend keeping the wards in place, as it seems to bloke the scrying of it's location, as proven by the Doom knight being unable to determine it was in Igrezor's possession when it gave it's threats.
This is strange, for when we divined the book in commune it appeared to only be several hundred years old and likely no older than five-hundred. This is well after the time of the Netherese and their use of magic. The warning is this "Forbidden Architectural Knowledge", which while strange, could be reference to a ritual structure or a dangerous memetic construction.
The book also appears to have been crafted from human flesh, it's creation overseen by the Lady of Bells and created by a mage acting as her proxy. It must be kept from the demon's grasp at all costs.
-Amin al-Din Abd Al-Rashid