Models like the Caestus Assault Ram, the Land Raider Prometheus, and the Razorback with twin-linked assault cannons (before the heavy nerf) are only fully documented with their original stats in this PDF. If you own an older model and want to play "Legends" games, you need this file.
The "Chapter Tactics" system introduced in this book became the standard for all future Space Marine codexes (7th, 8th, 9th, and 10th Editions). It successfully solved the "Vanilla Marine" problem, where players were discouraged from painting their army as anything other than Ultramarines because other chapters lacked rules. 6th Edition Space Marine Codex Pdf
Warhammer: The Horus Heresy (1st edition) used a modified 6th/7th edition rule set. Many Heresy players keep the 6th Edition Space Marine Codex PDF on their phones to reference vanilla marine rules for conversion purposes or for "Legacy" units that never made it into newer books. Models like the Caestus Assault Ram , the