The bonelord language is very interesting, I have a theory that the books for example You Cannot Even Imagine, Beware of the Bonelords, Acient Races and The Bonelord Threat I to III contains hints on how to solve the language. Its not written in plain view but I belive it holds parts of the key

I started some work / ideas on this theory but I have not been able to prove it 100%,
Here is a pastebin with my work so far : https://pastebin.com/z6NkgWNt

Reason for my theory is that I think that the solution is in the game and that would be a possible way to preserv the secret.

What do you guys think?