The Officio Assassinorum is a highly secretive agency of the Imperium of Man’s government that employs different “temples” that train human Assassins to further the goals and protect the security of the Imperium of Man. Although the Inquisition strikes fear in the hearts of all Imperial citizens, loyal and corrupt alike, the deadly disciples of the Officio Assassinorum strike fear in the hearts of even the most savvy, battle-hardened of Imperial warriors.
Assassins are typically deployed alone wherever feasible, having been trained to operate extensively behind enemy lines with no support. Given the sheer potential political power of this Adepta and the fact that its operatives are known to have been used against rival High Lords of Terra in the past, the authorization to assassinate a target must come from the very highest echelons of Imperial command. For this reason, Assassins are watched very closely to make sure that they are under the control of the Imperium.