TEXT: w w w. g a m e s - wo r k s h o p . c o m
  The agents of the Officio Assassinorum are a deadly scalpel
  deployed when the sledgehammer of the Imperium’s armies
  is too blunt and unsubtle a weapon to bring to bear. These
  killers are amongst the most proficient masters of the arts
  of death in the known galaxy. Their reach, it is said, extends
  from the heart of the Eye of Terror to the coldest reaches of
  the Halo Zone.
  An individual Assassin is a fearsome weapon, used only on
  the very highest of authority and against the most serious
  of threats. Yet, there have been times when even an
  Assassin was deemed incapable of striking down a target.
  At such times, the High Lords of Terra have ordered an
  Execution Force, consisting of a number of assassins
  working in concert, to be dispatched.
  It cannot be overstated just how serious a threat the
  Imperium must be facing for the High Lords to issue such
  an order. To deploy just a single Assassin is to commit a
  scarce and invaluable resource, for the temples recruit only
  a handful of Assassins each year. Yet, to send forth an
  Execution Force is to deploy such a weapon that their
  replacement, should they be lost, might take many years,
  and the Assassinorum would be weakened in the
  meantime. As a result, such a force is assembled only rarely,
  and only when the very future of an entire sector may hang
  in the balance.
  OFFICIO ASSASSINORUM EXECUTION FORCE
  POINTS: 100 + MODELS
  FORMATION:
  2-6 Imperial Assassins of the same temple. Details of these can
  be found in Codex: Daemonhunters and Codex: Witch
  Hunters.
  SPECIAL RULES
  Ultimate Assassins: The Execution Force (but not the rest of your army) benefits from the Flank March and Strategic
  Redeployment strategic assets.
  Temple: Depending on the temple from which the Execution Force is drawn, it will benefit from the following special rules.
  Vindicare Temple: Vindicare Assassins sometimes combine their fire for terrifying effect, enabling them to pin down not just
  single enemy units but at times, entire armies. Should all of the assassins fire upon the same target you may force one enemy
  unit per each assassin firing to take a Pinning test provided those units have line of sight to the target. No unit can be forced
  to take more than a single test per turn in this manner.
  Culexus Temple: The presence of a single Culexus Assassin causes a mighty disturbance in the ebb and flow of the Warp.
  When a group of them are present in the same area, their powers are merged; echoing, reverberating and resonating in a
  manner crippling to psykers in the vicinity. The range of the ‘Psychic Abomination’ special rule is increased by 6” for each
  assassin in the Execution Force.
  Callidus Temple: Callidus Assassins are masters of intrigue, using their disguises to sow confusion in the enemy ranks. When
  a number of the Assassins combine their efforts, enemy units may find themselves issued orders entirely contradictory to their
  superiors’ intentions. When using the ‘A Word In Your Ear…’ special rule, you may instead choose to reposition a single enemy
  unit up to 6” for every assassin in the Execution Force, and may choose the facing of any enemy units repositioned.
  Eversor Temple: A team of Eversor Assassins making concerted attacks against an enemy can entirely wipe out isolated
  targets in a series of devastating raids and ambushes, often ensuring the targets don’t even survive to fight the actual battle.
  You receive the Surgical Raids Strategic Asset for free. Rather than the single attack described in the asset’s rules, each target
  suffers one attack per assassin in the Execution Force.
  The last recorded deployment
  of an Execution Force was
  against the so-called ‘Chosen
  of Abaddon’, four enemies of
  the Imperium so steeped in
  blasphemy and murder that
  an entire team of assassins
  was dispatched to slay them
  upon Abaddon’s flagship. To
  date, the status of the team is
  not known, leading the
  masters of the Officio
  Assassinorum to fear the
  team lost, and the Chosen of
  Abaddon still at large.
  
SOURCE: textdata/thevault/Warhammer/40k/1st-8th Editions (Prior)/5th Edition (2008)/Apocalypse Datasheets/40k 5e - Imperial Guard - Officio Assassinorum Execution Force.pdf