Unwavering Phalanx

Use this Stratagem in your opponent’s Shooting phase, rubric marines or Scarab occult Terminators unit is selected as the target of an attack. Until the end of the phase, each time an attack is made against that unit, subtract 1 from the Damage characteristic of that attack If that unit contains 5 or fewer models, this Stratagem costs 1CP; otherwise it costs 3CP.