TEXT: www.games-workshop.com
  APOCALYPSE
  © Games Workshop Limited 2008. Games Workshop, Warhammer, Warhammer 40,000, Apocalypse are ©, TM and/or ® Games Workshop Limited 2008. All rights reserved.
  DEFILER ASSAULT FORCE
  POINTS: 100 + MODELS
  In 357.M41 the forces of Chaos landed on Urthwart,
  destroying all before them in a tide of destruction unseen
  in all the years since the Chaos Legions had fled to the Eye
  of Terror. At the head of the invasion, Abaddon the
  Despoiler, the Arch Enemy, led the warriors of the Black
  Legion, defeating every army that stood against him.
  Eventually the forces of Urthwart were forced to retreat to
  Bloden Keep. 
  After a lengthy bombardment the defenders were horrified
  to see a host of Defilers advancing toward the walls of the
  fortress, the giant cannons mounted on their backs blasting
  huge rents in the supposedly impervious walls. While some
  continued to pound the walls, others made straight for the
  main gate, attacking it with their claws and ripping through
  the thick adamantium with ease. Within the hour, Bloden
  Keep had fallen.
  COMMANDER
  FORMATION:
  3-6 Defilers. One Defiler must be the Assault Force
  Commander.
  SPECIAL RULES
  Assault Force Commander: The Assault Force Commander
  and any other Defiler from the formation that is within 6" of
  it receive a +1 bonus to their WS and BS.
  Strike Force: All Defilers in the formation must be deployed
  within 6" of the Assault Force Commander or, if coming on
  from reserve, must enter the table within 6" of the point
  entered by the Commander.
  Tear It Down!: If two or more Defilers from the formation
  are in contact with a terrain feature in the Assault phase,
  then they can attempt to tear it down with their claws
  instead of attacking any enemy models. The terrain feature is
  destroyed on a roll of 4+ (replace it with debris). Add +1 to
  the dice roll for each additional Defiler after the second that
  attacks the terrain. Models within a destroyed piece of terrain
  suffer 1 wound on a roll of 4+ (Saves are allowed) and each
  unit must take a Pinning test, while vehicles other than the
  Defilers suffer a glancing hit.
  DEFILERS
  
SOURCE: textdata/thevault/Warhammer/40k/1st-8th Editions (Prior)/5th Edition (2008)/Apocalypse Datasheets/40k 5e - Chaos Space Marines - Defiler Assault Force.pdf