Armour of Contempt

When: Your opponent's Shooting or Fight phase,
just after an enemy unit has selected its targets.
Target: One Adeptus Astartes unit from your army
that was selected as the target of one or more of the
attacking unit's attacks.
Effect: Until the end of the phase, each time an attack
targets your unit, worsen the Armour Penetration
characteristics of that attack by 1.