Immunity to Magic

An iron golem is immune to any spell or spell-like ability that allows spell resistance. In addition, certain spells and effects function differently against it, as noted below. A magical attack that deals electricity damage slows an iron golem (as the slow spell) for 3 rounds, with no saving throw. A magical attack that deals fire damage breaks any slow effect on the golem and heals 4d8+20 points of damage.