Spell Resistance

Spell resistance is the extraordinary ability to avoid being affected by spells. Some spells also grant spell resistance.

To affect a creature that has spell resistance, a spellcaster must make a caster level check at least equal to the creature’s spell resistance. The defender’s spell resistance is like an Armor Class against magical attacks. If the caster fails the check, the spell doesn’t affect the creature. The possessor does not have to do anything special to use spell resistance. The creature need not even be aware of the threat for its spell resistance to operate.

Only spells and spell-like abilities are subject to spell resistance. Extraordinary and supernatural abilities, including enhancement bonuses on magic weapons, are not. A creature can have some abilities that are subject to spell resistance and some that are not. Even some spells ignore spell resistance.

Spell resistance does not stack. It overlaps.