That situation is substantially different in 10th.

All of these rules piled on top of each other to combine in various different ways, and meant that different Chapters played radically differently. These supplements each contained a unique set of faction rules as well as extra Stratagems, Relics, and datasheets – though some (Space Wolves) had more of that last thing than others (Iron Hands) – but you still needed the base Codex: Space Marines to play them, and used nearly everything in it. This changed after the second Codex: Space Marines in late 8th edition, from which point on there was an additional range of Chapter Supplements – 10 of them! – covering the 9 ‘First Founding’ Chapters, plus Deathwatch.

At the beginning of 8th edition most Marines were in the main Codex and then a few other Chapters had their own completely separate books. It’s worth highlighting this right at the start, because 10th edition treats sub-factions in a different way to how 8th and especially 9th edition did, and this is most impactful for Space Marines.

Not only is the faction huge in its own right, but there are a number of sub-factions based on their most famous Chapters. Their index is the biggest of the bunch, packed full of datasheets for (nearly) every unit in their gigantic range, plus some new ones like the Ballistus Dreadnought and the Apothecary Biologis. The Space Marines are the iconic faction of Warhammer 40,000, and take their traditional place in the launch box facing off against the Tyranids of Hive Fleet Leviathan.

40k most deadly space marine chapter