Space Marines are genetically and technologically enhanced human warriors who fight for the Imperium of Man in Warhammer 40,000. Their formal name is the Adeptus Astartes. Organized into Chapters with distinct customs and identities, they are elite forces sent into battles the Imperium considers especially urgent—not a single, culturally uniform army.
What is the Adeptus Astartes?
The Adeptus Astartes is the Imperium’s formal name for its Space Marines. They are enhanced warriors equipped with power armour and advanced weapons. Games Workshop describes them as the Imperium’s “Angels of Death,” an image that captures their role as formidable instruments of war rather than ordinary soldiers. Games Workshop’s Space Marines overview describes their elite strike forces and place in the setting.
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Space Marines are central to much of Warhammer 40,000, but they are few compared with the Astra Militarum, the Imperium’s much larger human military. The setting presents them as forces committed when the Imperium faces dire need. That does not mean every Marine is a conventional protector of civilians: the Imperium may view them as saviors, but the setting is grim science fantasy, and that perception is not a neutral description of their actions.
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What do Space Marines do?
In the setting, Space Marines operate as elite intervention forces. Their strike forces combine speed and power to attack threats that conventional forces might struggle to contain. On the tabletop, the faction’s broad identity is a flexible, elite combined-arms force: infantry and specialist units can be supported by heavier assets. The exact units and rules depend on the game edition and the army a player builds.
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What are the different Space Marine factions?
For loyalist Space Marines, the most useful beginner-level answer to “faction” is usually Chapter. A Chapter is both a military formation and a cultural identity: it gives its warriors a shared lineage, customs, symbols, and often a characteristic approach to war. Established Chapters have recognizable colors, but hobbyists can also devise their own Chapter and paint scheme, as Games Workshop’s getting-started guide explains.
Chapters do not all follow the Codex Astartes—the organizing tradition associated with Space Marine forces—in the same way. Their shared Astartes identity does not erase their differences. These selected examples show some of that variety; they are not an exhaustive list or a ranking.
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| Chapter | Illustrative distinction |
|---|---|
| Blood Angels | Associated with massed jump-pack assaults in Games Workshop’s Chapter overview. |
| Imperial Fists | Associated with disciplined firing lines in the same overview. |
| Space Wolves | Maintain distinctive formations and customs, and are described as disdaining the dictates of the Codex Astartes. |
| Other prominent names | Ultramarines, Iron Hands, Salamanders, Raven Guard, White Scars, Dark Angels, Black Templars, and Deathwatch. These names identify further notable groups, not a complete roster. |
The tactical descriptions are useful starting points, not definitions of every warrior or battle. Games Workshop’s 2023 Chapter focus uses these differences to illustrate how shared Space Marine identity can coexist with varied traditions. Its rules discussion is from a previous edition, so it should not be treated as current game guidance.
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What is the difference between Space Marines and Chaos Space Marines?
The loyalist Adeptus Astartes serve the Imperium; Chaos Space Marines are traitor forces opposed to it. Games Workshop describes Chaos Marines as a dark reflection of the Emperor’s warriors, associated with treachery and the Dark Gods. Their backgrounds and motives are not necessarily identical from one individual or warband to another. The distinction is a broad allegiance and setting contrast, not a claim that every character shares the same story. Games Workshop’s Chaos Space Marines introduction provides a beginner-level overview.
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How do Space Marine tabletop rules change?
Space Marine lore and Chapter identities are enduring parts of the setting; tabletop rules are edition-specific and can be amended. In a preview published on 10 September 2026, Games Workshop said the new Codex would replace the Oath of Moment army-rule framing with Combat Doctrines: Tactical, Assault, and Devastator. This is a dated preview, not a full rules reference. Consult the applicable Codex and its current errata for the rules used in a particular game. The existence of official Space Marines Codex updates and errata is a reminder that printed rules can be revised.
Games Workshop’s 2026 Space Marine faction focus also discusses Chapter-related detachments. Such game-rule framing can help explain how a faction plays, but it should not be confused with permanent lore about every Chapter.
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Where should a new reader start?
You can understand Space Marines as part of the setting without collecting miniatures or playing. If you want to explore the tabletop faction, Codex: Space Marines is the direct book reference for its lore and rules; check that the edition matches the game you intend to play. Miniatures, a starter set, and painting supplies are optional hobby choices, not prerequisites for learning the lore. Games Workshop’s starting guide covers the connection between faction, army-building, and painting.
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