There is no ISBN anywhere in or on the book. Other than one page in the very back of the book that has credits, the book is presented as being entirely "in universe" as much as possible, like you could go and pick this up in an Eorzean library.
I haven't had the opportunity to entirely read it over, but so far there isn't much in the way of Au Ra lore beyond the three pages they are given in the book. There may be snippets hidden elsewhere, but I haven't uncovered them just yet!
I haven't had the opportunity to entirely read it over, but so far there isn't much in the way of Au Ra lore beyond the three pages they are given in the book. There may be snippets hidden elsewhere, but I haven't uncovered them just yet!