You want:
Rulebook
RECOMMENDED: 2018 Rulebook (hardcover) remains easiest to source and most comprehensive. Provides core rules (inc basic Psyker rules), a campaign (Dominion) and core scenarios, and it also includes the core skill sets used by all gangs.
- Alternative rulebooks include:
- Dark Uprising Rulebook: core rules plus dark uprising campaign (not psykers), a campaign (dark uprising campaign), rules for Enforcers and Corpse Grinders, and core skill sets used by all gangs.
- Hive Wars Rulebook: simplified core rules, simplified gang creation rules. Does have some updated (better) rules e.g. around sentries and sneak attack rules.
- Ash Wastes Rulebook: core rules, plus vehicle rules. Ash Wastes campaign.
Don’t get the original 2017 rulebook or the supporting ‘Gang Wars‘ SoftBank supplements, as these are all superceded.
House books
Each House book provides updated gang creation rules for each of the House gangs, including house specific hangers on, brutes, dramatis personae, skills, terrain, scenarios, equipment lists etc.
E.G if you want to play an Escher gang, get House of Blades, You don’t NEED any of the others.
Alternative: Gangs of the Underhive presenters the original gang creation lists for each House gang. But these have now been superceded by the House of Books.
Book of… books
Each of these provides additional, optional rules (some more optional than others, depending what you want to play, but definitely not essential). They pretty much all include some matrial you can’t find elsewhere (e.g. Dramatis personae) as a ‘nice to have’.
- Book or Peril: Badzone Environments, Badzone Scenarios, Badzone Trading Post, Venators gang list
- Book of Judgement: Law & Misrule campaign. Black Market, Criminal Alliances, Palatainate Enforcers gang list
- Book of Ruin: Gang lists for Genestealer cults, Helot Cults, Corpse Grinder Cults. Rules for corrupting House gangs, Scenarios.
- Book of the Outcast: Outcast gangs. Uplated and expanded Psyker rules. Outlander Campaign and Scenarios. Updated Trading post.
- Book of the Outlands: Gang lists for Ash Waste Nomads and Squat Propsectors, Vehicle rules and Vehicle creation rules.
If you expect to play with vehicles, Book of the Outlands is probably essential (includes all vehicle rules from Ash Wastes Rulebook, and Vehicle creation rules not found elsewhere)
Narrative books
Only one so far: Cinderak Burning. Narrative campaign focussed around ongoing narrative.