Arbitrators are tough law-keepers and judges. They ensure that the Imperium’s laws are maintained, whilst also acting as executioners for rebels, seditionists and trouble-makers. Arbitrators do not serve on any local planetary police force, rather they are members of a higher organisation: the Adeptus Arnites. Arbitrators are not very strong, and they sometimes lack social graces. When it comes to sheer ability to soak up damage and to track down their prey, however, they are certainly the ones you want to talk to.