When the D'ni were fighting the Pento War, what was humanity doing? When humans were building Stonehenge, or the Great Pyramid of Giza, what wonders were the D'ni accomplishing?

This supplement for Unwritten: Adventures in the Ages of MYST and Beyond brings 10,000 Years of D'ni and human history together for the first time; from the birth of Ri'neref on Garternay, to the moment when humans begin to use the Art.