The Adeptus Arbites are the Imperium’s police force, tasked with enforcing Imperial law across the galaxy. They answer only to the Adeptus Terra and are feared for their harsh, uncompromising justice.
What are the Adeptus Arbites?
The Adeptus Arbites are the law enforcement arm of the Adeptus Terra, the Imperium’s central bureaucracy. They enforce the Lex Imperialis, the body of law that applies to every world under Imperial rule. Their authority comes from the Emperor himself, and they act as judge, jury, and executioner in matters that concern the Imperium as a whole.
They’re not concerned with local laws or petty crimes. Each planet has its own government and police for that. The Arbites step in when Imperial law is broken, like a governor failing to pay their tithe or a world rebelling against Imperial rule.
- Enforce the Lex Imperialis, not local laws.
- Answer to the Adeptus Terra, not planetary governors.
- Operate across the entire Imperium, with a headquarters on Terra.
How they operate
Arbites are organized into precincts and commanded by Lord Marshals. Their leader is the Grand Provost Marshal, based in the Hall of Judgement on Terra. They have the power to intervene in any world’s affairs if Imperial law is at stake, and they’re known for being utterly merciless.
They don’t offer trials or mercy. Citizens have no rights under their jurisdiction, and only members of the Priesthood of Terra or the Inquisition might claim anything like a trial. Their punishments are swift and often lethal.
History and notable events
The Arbites date back to the Great Crusade, when they were established to handle non-local matters on compliant worlds. During the Horus Heresy, their Grand Provost Marshal sat on the War Council. They’ve been involved in major conflicts like the War of the Beast, where they suffered heavy losses defending Terra.
During the Age of Apostasy, they fell under the control of Goge Vandire. After the Great Rift opened, they struggled to maintain order on Terra as Chaos cults and riots erupted. Most of their stations were overrun until Roboute Guilliman arrived and helped restore order.
On the tabletop
In Warhammer 40,000, the Adeptus Arbites are part of the Agents of the Imperium faction. They can be added to any Imperial army as auxiliaries, bringing their shotguns, shock mauls, and carapace armour to the fight. They’re especially effective in Boarding Actions, where their close-range skills shine.
The kit builds three types of squads: the Exaction Squad with specialist gadgets, the shotgun-armed Vigilant Squad, and the Subductor Squad for melee. Each squad’s Proctor can use a nuncio aquila to intimidate enemies, making their aim unsteady.
| Unit type | Role | Key gear |
|---|---|---|
| Exaction Squad | Specialists | Gadgets, shotguns |
| Vigilant Squad | Ranged | Shotguns |
| Subductor Squad | Melee | Assault shields, shock mauls |
Key facts
- The Adeptus Arbites are the Imperium’s police force, enforcing Imperial law across the galaxy.
- They answer to the Adeptus Terra and are led by the Grand Provost Marshal.
- They enforce the Lex Imperialis, not local laws, and have the power to act as judge, jury, and executioner.
- They date back to the Great Crusade and played roles in major events like the Horus Heresy and the War of the Beast.
- In games, they’re part of the Agents of the Imperium faction and can join any Imperial army.
FAQ
What do the Adeptus Arbites do?
They enforce the Lex Imperialis, the overarching law of the Imperium. This includes making sure planetary governors pay their tithes and putting down rebellions against Imperial rule.
Who leads the Adeptus Arbites?
The Grand Provost Marshal, who is based in the Hall of Judgement on Terra. They answer to the Adeptus Terra.
Can the Adeptus Arbites be used in Warhammer 40,000 games?
Yes, they’re part of the Agents of the Imperium faction and can be added to any Imperial army as auxiliaries. They have rules for standard games and Boarding Actions.