A model with Magic Resistance gains a bonus to dispel enemy spells directly targeting it (not including templates that are placed on top of it) as well as a Ward save against damage caused by spells. This bonus is based on the number shown in brackets after Magic Resistance. Note that Magical Resistance does not offer protection against Miscasts.
If a character with Magic Resistance joins a unit, all models in the unit benefit from the Magic Resistance as long as they are part of the unit. If a model or unit has two sets of Magic Resistance, the two combine to a maximum of Magic Resistance (3), unless specified.