Spell resistance

Spell resistance is a form of magical defense possessed by many creatures, particularly powerful undead, dragons, golems, and outsiders. It can act as a form of magical immunity against spells. Creatures can voluntarily lower their spell resistance to allow others to cast beneficial spells on them. Spell resistance does not grant unfettered immunity to these spells, however; the caster can pit his or her own magical might against the spell resistance in order to overcome it and render it useless.