The Core Rules cover the basic mechanics of playing Death Unto Darkness.
Appendix 1 – Character Creation covers how to create a character for Death Unto Darkness, traits, as well as downtimes rules.
Appendix 2 – Psychic and Techno-Arcana Disciplines covers the rules for playing Psykers and Tech-Priests it also includes some additional info for Skitarii.
Appendix 3 – Lore covers the rules for playing lore-focused characters, as well as the rules for interrogating captives for information, and the rules for Tech-focused Characters for solving the system puzzles used in some tech puzzles.
Appendix 4 – Wargear covers all the available combat equipment in Death Unto Darkness, as well as various interesting relics to be found beyond the Imperium.
The Character Creation Guide is useful for writing a character that fits into this Campaign.
Medical and Powers Decks
All characters with the Medicae and Chirugeon traits need to print a Medical Complications Deck
All characters with the Psyker Mutation trait need to print a Perils of the Warp Deck
All characters with the Lay-Mechanicus trait need to print a Scrapcode Burnout Deck