The book, "Ultima I: The First Age of Darkness," was packaged with the re-release of Ultima I and the Ultima I - III Trilogy set. Written by Dave Albert, within the text an unknown Sosarian is credited for his contributions. It is 39 pages long.
The book contains the following topics:
The original release of Ultima 1 contained a completely different manual: the "Playbook." With "The First Age of Darkness," the re-released Ultima I builds a neater bridge between the original game and its sequels by greatly expanding the story from an "in-game" perspective.