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Both War Zone Octarius books provide some great guides for building tree campaigns, and of those, Critical Mass also provides updated rules for Fortifications. The Campaign books also have Narrative and Crusade rules that they add to the game, though again these aren’t strictly necessary to play and they can be a bit of a chore to dig up now. The other notable books here are Containment, which has the Planetstrike rules, and Catastrophe, which has rules for 3-player games. The best of these from a pure “quality of missions” standpoint is probably Amidst the Ashes, but again you don’t need it to play Crusade and have a great time. Over the course of 9th edition Games Workshop have released a number of Crusade Mission packs such as Beyond the Veil and Plague Purge these introduce new missions to the Crusade game format and additional rules, but they are by no means necessary to play. Your army’s Codex will also give you additional Crusade rules you can use to enrich the experience, but these aren’t strictly necessary to start your army’s path to glory. If you’re planning to play Crusade, then the Core Rules have everything you need. If you want something a bit more competitive but without the complication of picking secondary objectives, then consider picking up the Tempest of War Deck, which has a similar card-based mission generation system but a much tighter, more tactical rule set that rewards thinking on your feet mid-game.
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In that case, we’d recommend picking up a copy of the Open War deck, a series of cards used to randomly generate Open Play Missions. You don’t need any other core rules to play this way (though we’d recommend picking up your army’s Codex rather than using the datasheets that come in the model boxes), but if you are playing Open Play you may want more than a single mission to play with. The mode where you just mash models together on a kitchen table or you floor. Depending on what kind of 40k experience you’re going for, there are different sets of rules for each. Games Workshop has divided 40k play into three general categories: Open Play, Matched Play/Competitive Play, and Narrative Play. If you get the biggest version, the Command Set, there’s even a version of the full core rulebook included sans fluff text and such. This is the full core rulebook – there are also starter sets in Recruit, Elite, and Command edition (given in order of price and contents) which contain slimmed down versions of the rules for beginning play and are a great way to get started if you’re new. The hardback version of the core rules is found in the Warhammer 40,000 rulebook.
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