Deus Ex Bible

The Deus Ex Continuity Bible, commonly known as the Deus Ex Bible, is a collection of content from design documents for Deus Ex, along with Q&A sessions between developers and editors at Planet Deus Ex and GameSpy. The Deus Ex Bible was published on GameSpy in April 2002, and includes backstory content for the Deus Ex universe along with developer commentary.

Background
The Deus Ex Bible was intended to summarize key backstory information behind the Deus Ex universe, with a few additions and modifications for the sake of maintaining consistency with the finished game. For example, the Deus Ex Bible includes details expanding on the backstory of JC Denton and Paul Denton.

The Deus Ex Bible also includes story-related elements that existed during development but are unmentioned in the final game, such as the location of Mount Weather (the site where Daedalus was created) and the Russo-Mexican alliance (a military faction at war with the United States). In reference to the presence of cut content, the editor's note states that the backstory pieces in the Deus Ex Bible should be considered to be canon "whenever possible but not necessarily with religious fervor":

The Deus Ex Bible served as a basis for the later games developed by Eidos Montréal. According to Mary DeMarle, narrative director of Deus Ex: Human Revolution, the world depicted in Human Revolution was created by filling in the blanks in the timeline described in the Deus Ex Bible: