The laws of the Imperium are a complex web of tradition, obligation, and local custom. Thus, they can vary from world to world or sector to sector, with each planetary governor, local prefect, or headman pronouncing his own laws. Arbitrators care little for such trivialities, and enforce the serious crimes against the Imperium while leaving such petty matters to local officials. Murder or theft, for example, are considered inconsequential unless they affect the Imperium directly, are perpetrated against Imperial officials, or somehow fundamentally threaten a world’s security or safety.
Arbitrators have little pity or compassion for the transgressions of Imperial citizens. Years of dealing with the scum of the galaxy has made many of them cynical and bitter. Others have become zealots, seeing the Emperor’s hand in the letter of the law and believing anyone who would break it deserves only death. A few might maintain idealistic notions for bringing order to the Imperium, but the realities of endless—sometimes horrific—crimes constantly erode such notions. The arrival of an Arbitrator patrol is seldom welcome, given the brutal way in which they operate during their investigations, arrests, and executions, even though it might mean an end to vicious criminal enterprises.
An Arbitrator must deal with ineffectual or corrupt local agencies. These are often an Arbitrator’s greatest foes as they must clean up a local situation, taking over the unfit local law enforcement of a hive city, orbital station, or even entire planet to purge it of crime and corruption in a series of bloody and unforgiving sweeps.
On Imperial worlds, the Adeptus Arbites is the last, most absolute law, answering only to its commanders and the Judges of systems and sectors, and not to local authorities. It is a thankless task, for the anonymous, helmeted Arbitrator usually receives only fear and hatred for their actions. They and their cohorts are the final bulwark against heretical uprisings and other major threats. Their precinct-fortress is the often last bastion of Imperial rule during revolutions or invasions, holding out to the very end whilst alerting outside agencies of the dire situation. Each member knows that should they fall, so follows the planet. To merely survive in such a hostile environment, Arbitrators must show no hesitation, regret, or compassion for those they protect, and they must consider every citizen guilty until proven innocent.