Halo Story Bible

The Halo Story Bible, created by Bungie Studios, is the single most important object to the development of the Halo universe the company has. The Story Bible, as it is simply called, contains all the information Bungie has developed pertaining to the Halo Universe.

Secrecy
The Bible's content is the most comprehensive collection of material for the Halo universe, and, to date, the single most secret thing Bungie holds. The book contains background information, technical data, and details about Halo related things not ever mentioned anywhere, ever. It also is likely to contain development information to future Halo projects, such as Halo 3, Halo Wars, upcoming Halo novels, and the like.

The Bible is so carefully guarded, it is unknown how many copies of it exist, or if it is even a book at all. Eric Nylund, writer of three of the four Halo novels, commented in one of the Letters to Halopedia that the Story Bible was given to him during the writing of the books then quickly taken back once they were complete.

Some of the less sensitive material, however, was published in the Halo: Combat Evolved: Sybex Official Strategies & Secrets strategy guide. To date, this is the only information from the Bible known.