Spell resistance is a special defensive ability. If your spell is being resisted by a creature with spell resistance, you must make a caster level check (1d20 + caster level) at least equal to the creature's spell resistance rating for the spell to affect that creature. The defender's spell resistance rating is like an AC against magical attacks. The same process occurs if an enemy attempts to cast a spell on one of your characters. If your character has spell resistance, then they will automatically try to resist the spell requiring the attacker to make a caster level check as explained above.
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