Posted 02 March 2013 - 02:09 AM
The Necrons occupy a small section of Tome of Fate, a book dedicated to Tzeentch. The Necrons occupy a significant chunk of The Outer Reach, a book dedicated to the Necrons, the Dark Pattern, and all the worlds outside of the 'main' areas of the Jericho Reach.
It is a significant expansion from a lore perspective and has additional rules not present in ToF. It's a great book, but for the various plot-hooks if gives you, the world-building stuff on the Jericho Reach, the racial expansion in the Necrons, and the new Advanced Speciality of the Dead Station Vigilant.
Matt Eustace. Contributing Author Credits: Church of the Damned, The Lathe Worlds, The Lathe Worlds - The Lost Dataslate, Only War Core Rulebook, Hammer of the Emperor, Shield of Humanity, Tome of Fate, Tome of Blood, Tome of Excess and Tome of Decay.
The views expressed in this post are my own. I do not speak for or on behalf of Fantasy Flight Games.