So, first off, I'd like to say that I only JUST started learning how to use Blender a few days ago, and making this little thing is how I got around learning a bit of the basics, so don't expect something extravagant or anything.
That said, I'm not sure if the idea behind this age would work with Ronay/D'ni history. Because I've never heard anything about the first descriptive book, I decided to try and build a temple that might house that first book as a sort of shrine to Yahvo, out of gratitude for the gift of writing ages. So basically, I think it could be that during the time the Ronay people were leaving Garternay to go to both Terahnee and D'ni, someone took the book to keep it from being destroyed, and escaped with it. They could have written a new age; one that's stable, to house that book. Of course, since it was the first book, it's probably safe to assume either A) it still works, and could possibly be the very gift Yahvo gave to the Ronay people to show them the ability to write descriptive/linking books, or B) as the first descriptive book written after discovering the gift, it might have been written with too many contradictions because of a lack of knowledge in writing, and would be too dangerous to travel to since the age probably deteriorated.
So whether only the Ronay people know about this age, or only the D'ni people, or both know, is up for debate. Or, that person who took it could have kept it a secret, and the book to the age housing the temple could have been lost until found by explorers, either in D'ni or in some other age.
Well, even if the story behind the age isn't something that'll work because of history that's already written, it can be changed, so anyways, here's a few pictures of the temple. There's no other environment around it yet, since I'm still learning how to go about creating it (and I don't even know what kind of environment I would want it in), so it's just the temple for now.
Photobucket link!