Rites of Battle is a sourcebook about the inner workings of the Deathwatch. Extensive guidelines for creating your own Space Marine Chapter, new advanced specialities, expanded rules for power armour, and new rules for vehicles make this book an important resource. Rites of Battle also provides detailed information about Watch Fortress Erioch, the center of Deathwatch activity in the Jericho Reach. This section helps the GM present a Kill-team with a unique challenge.