Some models have the Magic Resistance (-X) special rule, making them resistant to the magic of their enemies. The Casting roll of any spell (including Bound spells) that targets an enemy unit that includes one or more models with this special rule suffers a modifier, as shown in brackets after the name of this special rule (shown here as '-X').

Note that this special rule is not cumulative. If two or more models in a unit have this special rule, use the highest modifier.