Firstly, I'm shocked this companion book wasn't as widespread as the other Deltora side books, but it did come out a few years after the mainline story ended, so people may not have been expecting yet another Deltora collection.
I am embarrassed to admit I wasn't able to work out the secret messages for two of the chapters. The Dragon song hints, which seem clear, weren't leading me to put any words together that made sense, how annoying! And for all the quips Doran makes about his "rough & blunt" writing voice, I barely read any gruffness or raw quality. It was rather clean and put together. I wish there had been more of individual personality afforded, I didn't pick up on any voice difference at all. Just because a narrative is telling you something doesn't mean it's effectively showing it.
Regardless of these critiques, the book-making nerd inside me grinned with glee at all the extra efforts to enhance the reading experience throughout this tomb. The fold-out map, the new art by the ever lovely Marc McBride (with some instances of art from previous companion books), the sketches, and there was even an instance where Doran squashed a Plains Scorpion with the book, which left a purple stain on a page. The attention to detail there, it really adds a level of care and passion to the book. Love to see that in a work.
So, the only remaining Deltora companion after this is the Dragon Drawing guide and I barely count it. I will use it happily because I haven't sketched in forever and the book will give me a good diving point to return to the habit. But after that, I'll be reading three more loosely-connected Deltora stories only recently confirmed by Rodda in 2015: The Rowan of Rin series, the Three Doors, and the Star of Deltora (a quartet I think). But I'm sad to say good-bye to the final mainline Deltora Quest book. Sad and nostalgic, I eagerly look forward to rereading more childhood favorites in the future. For now, I bid goodbye to Lief, Barda, and Jasmine. It was fun reuniting with old characters that were my own adventure companions in a way.