From the back cover: "Hammers of Faith contains everything you need to know about the armies of the North, including: - An overview of Northern politics and history - Backgrounds on all the major war machines - In-depth Field Guides for the Northern Guard and all three Northern league armies - New squads and options to let a Northern commander handle nearly any situation - 30+ Datacards, covering all Northern designs and major variants, for easy reference Supplement for Heavy Gear Blitz! requires the main Heavy Gear Blitz! Rulebook (DP9-996) to play."