>>41431593
Supernaturally generated books. Lifestyle guides for "outside of Eden" lifestyles.
The sigils have a lot of metaphysical information; you learn more the more you work with them.
Teaches you how reality works overall etc.

For example we live in a "conceptually generated start world; Eden"

Here's some more Invasory Rays, of nahemoth.

>>40846085
Yes; these "invasory Rays of nahemoth (The Black Earth)" specifies "Black Earth Fortress establishment and management"; ie "datamining" here is a good way to predict and prepare for "future lifestyles" by studying the Qliphothic Skillsets in the Invasory Rays chapter.
See "Blackstone Fortresses" for 40k references.
Physically stable fortified "Town hub" places in the warp (interior room dimension wise) in places where "outside dimensions will constantly reroll in a roguelike fashion".
(see "town hubs" in Diablo 2/PoE)
https://warhammer40k.fandom.com/wiki/Blackstone_Fortress

>>40619269
These includes some sort of "Black Earth Fortress planning and such"; "invasory rays of Nahemoth from "Book of Sitra Achra second edition"; ie stuff to prepare something similar to "Mephistos group in the Diablo 2 example (Durance of Hate is a Black Earth fortress of that kind)".
See if you can figure them out.