Guthron's book is part family bible and part journal. It covers the history of NahamMerch in the Azilhar lands and the story of his family thereafter. There are descriptions of religious ceremonies, records of significant events and a lot of personal musings. The book starts in Quenya and later moves into what seems to be various old dialect forms of Azilharian. Many different people have written it over the years with differing styles and differing levels of detail. Not everything is dated, although it does appear to be largely chronological and covers a period of about 400 years. In some places there are gaps of many years between entries and it would appear that some other pages have been ripped out or otherwise lost.
It has been unbound and rebound several times so that new pages can be added. There are also sections where later authors have gone back and amended or annotated earlier entries. (Imagine getting a patchily maintained, hand written copy of the Record, in a mixture of Ancient Greek and Middle German and trying to work out what really happened to the Party).
Using the Comprehend Languages spell you are able to translate and understand about 80% of the content. The rest you can mostly read, but it doesn't make sense to you. There are a few words and phrases which you can't even read, from which you assume that they were written by someone who didn't know what they meant either. There might of course be other information that has been lost in the translation.
It is beyond my powers of imagination (and available time!) to create the entire book for you, so I will tell you here the bits that I think you find relevant at the moment.
It is immediately apparent that NahamMerch has nothing to do with the Ghraman church or belief system.
Hanging people features regularly as a ceremonial punishment and is usually referred to as suspending.
A personal section of self-reflection, apparently written by one of his descendants many years after NahamMerch's death, says…
As the teachings instruct us 'only the crescent Z'rechân moon can see the Tamils-Âmniz as only the darkened orb sees the tower of Tor-lig', so must I wait for the appointed time to understand the wisdom of the Jahamaral and to receive their rewards.
.. but you also remember a phrase in the early Quenya part which says…
the Siregan reveals the Diamond of Time to those who know its shape.
Both the pentacle and the crescent moon were important as symbols, but the practise of associating ceremonies with the phases of the moon is only mentioned much later in the book.
Descriptions of the geographic locations of temples etc. are noticeable by their absence. This seems to be deliberate.
An early section apparently written by NahamMerch himself records some minor problems in raising taxes, he records
It is disgusting how quickly they have become dependant upon the waters of the Athis and how much this influences their actions. They are worse than sheep.
There is a gap in the text immediately after NahamMerch's death and you believe that the description of it that is there is probably based on hear-say, even though it is written as an eyewitness account.
The account is cryptic, and uses a lot of allegorical language, but you get the impression that the people rebelled and somehow managed to kill NahamMerch themselves. One or more persons called Chalan are mentioned but it isn't entirely clear what part they played, except that the writer(s) of the book hated them.
You notice several oblique mentions throughout the book to someone or something called Va-geem or Vakim. He (or she or it or they) seems to have visited to various people over the years. This event is often closely preceded or followed by a change in the handwriting.
Shortly after the accounts resume following NahamMerch's death, there is a mention (in bad Quenya interspersed with Azilharian and several words which the writer apparently didn't understand) of the "Spying Skull" and how it was used to gain information about plots of a local Sultan, which information was then used to control him very nicely. Shortly after that the writer curses that the Spying Skull is lost and that someone is going to pay for this outrage.
Part way through the book there is a section that seems to deal with Nahamerch's journey to Azilhar (although written in the 3rd person and in a very poetic style). After some cursed but unspecified event centuries before, Nahamerch was summoned from "the high, white lands" to meet with the Jahamaral beyond in Caro.
He took the orb, helm and the Or-lan necklace to the Place of the Keepers and there he built the Temple of the Dark Sun. Then he came to Azilhar and built the Temple of the Brilliant Moon.
More on the "seeing skull" - one priest talks of questioning the "dead spy" and so learning that two acolytes had plotted against him. They were shortly afterwards suspended and "danced the buzzard's step".