The following rules apply to Catachan units in a standard Imperial Guard army:
- Any Catachan unit or character may be upgraded to a Deathworld Veteran at a cost of +3 pts per model. Deathworld Veterans have +1 Weapon Skill and also receive the abilities described in the special rules that follow.
- Catachan Command platoons may include 0-2 Assault teams (see the army list for details) as part of the platoon's complement of heavy weapon squads.
- The army may include Deathworld Sentinel squadrons as Fast Attack choices (see the army list for details).
- The army may include Catachan Devils squads and/or Deathworld Veterans Snipers as Elites choices. IMPORTANT: When included in an Imperial Guard army these units are not allowed to set up in ambush (though they can infiltrate in scenarios which does allow for infiltrators to be used).