A unit that includes any models with this special rule may not be joined by any model that does not also have this special rule (this includes Legion Techmarines and Legion Apothecaries, which may not be assigned to a unit with this special rule unless they also have this special rule).
If a unit contains at least one model with this special rule, and that unit is Charged, every model with the Counterattack special rule gains a number of additional Attacks equal to the value in brackets listed as part of this special rule. If no value is listed then the unit gains +1 Attack. If, when Charged, the unit was already locked in combat or has made the Hold the Line Reaction, the Counterattack special rule has no effect.
When a unit that contains at least one model with this special rule takes Morale checks or Pinning tests, the unit ignore any negative Leadership modifiers. If a unit is both Fearless and Stubborn, the unit uses the rules for Fearless instead.
Remorseless: A model with this special rule that does not have the Cavalry Unit Type or Artillery Unit Sub-type ignores any modifiers or restrictions on moving during the movement phase (Including modifiers imposed by Terrain or Restrictions from rules such Pinning which would normally stop them from moving) as long as the model does not Run or make use of another alternative form of Movement such as 'Activating a jump pack, Disembarking, or deploying via Deep Strike. Furthermore, as long as the model has not Run or used another alternative form of Movement in the controlling player's Movement phase, it is counted as Stationary when making shooting attacks until the start of the Controlling Player's next turn. This special rules does not affect whether or not a model may make a Charge, and does not allow models with the Vehicle Unit Type to ignore the effect of an Immobilised result on the Vehicle Damage table (But does allow a model with the Vehicle Unit Type to move even when under the effect of the Crew Stunned result on the Vehicle Damage table)
