The target creature has its spell resistance set to 12 +1 per caster level. If the target already had a higher spell resistance, this spell has no effect. This spell can still have Dispel Magic and Breach cast on it to remove. Any spells which are unaffected by spell resistance are not protected against. Casting this spell twice on a target will work, however the effects do not overlap (but could possibly be useful for resisting Dispel Magic and Breach attempts for longer).