In the Battle-shock step of your opponent’s Command phase, if an enemy unit that is below its Starting Strength is within 12" of one or more HERETIC ASTARTES units from your army, that enemy unit must take a Battle-shock test, subtracting 1 from the result. Enemy units affected by this Detachment rule do not need to take any other Battle-shock tests in the same phase.
Each time a HERETIC ASTARTES model from your army makes an attack that targets a unit that is Below Half-strength, add 1 to the Hit roll.
Each time an attack targets a HERETIC ASTARTES unit from your army, if the attacking model is Battle‐shocked, subtract 1 from the Hit roll.
Each time a HERETIC ASTARTES model from your army makes an attack that targets a Battle‐shocked unit, add 1 to the Wound roll.