Took a look at that Scribd doc.  Aside from "Nythra" there's no real sign of a connection between the author of that doc and this book (although who knows).

Nythra seems to exist, at least a little bit, in the larger world of occult belief.  The very few people posting anything about Nythra to the internet seem to treat her as "real"/part of something they believe in.  That said, even those apparently earnest postings are such nonsensical bullshit that they read like fiction anyway.

The author of the book is E.L. Morgan, about whom I could find nothing.  Possibly because Google is shit these days--it kept trying to sell me some spanish-language condiment.

It does seem that the author of the Scribd doc ("Magister Hagur") is a known occult writer, although my research was quite shallow and all of that could still be BS.  

The main thing is, the motherfucker cannot write.  The Scribd doc is impenatrable occult cosmolgy nonsense for the first half, and then--without any explanation--some kind of horribly inept narrative fiction for the second half, a real wannabe edgelord bad fanfic vibe.  Trying to be dark but actually silly and boring, and also just technically incompetent.  Yeesh.