>>41239718
Book of Sitra Achra: A Grimoire of the Dragons of the Other Side.
https://archive.org/details/TheBookOfSitraAchra/page/n103/mode/2up

>>40931168
Here's more practical stuff to work with.
Emissaries of Thagirion Qlipha from Book of Sitra Achra.
The emissaries teaches you directly step by step about each Qlipha in the Qliphoth.
Full chapter here;
https://archive.org/details/TheBookOfSitraAchra/page/n41/mode/2up

>>40837866
?
No not really.
Also sigils have never been "some random symbol for just visuals"; all the sigils in these books is stuff like Diagrams; teaching you more about the Qliphoth. They're meant to be worked with; not just "seen as a visual symbol".

Study these Emissaries for example.

>>40835988
Thagirion Emissaries

>>40819711
ie sigils etc are not human designed; they're generated straight from Qliphothic sources; ie stuff worth studying if you want direct understanding of the Qliphoth (tree of Death/Knowledge).
Emissaries in Book of Sitra Achra for example teaches you about each Qlipha.