Some weapons or creatures are so powerful that they can punch right through armor, so armour provides less protection against them. Such attacks confer modifiers that are subtracted from the foe's armour saving throw. This is shown by the table opposite.

For example, a crossbow bolt (S4) hits a warrior wearing light armour and shield. Normally, he would need to roll 5 or 6 to make his armour save and avoid taking the wound but, because of the crossbow's enormous hitting power, -1 is subtracted from his dice roll. Therefore, he must now roll a 6 to save.