Assay Spell Resistance(Spell Compendium, p. 17)
Level: Cleric 4, Sorcerer 4, Wizard 4, Spellthief 4,
Components: V, S,
Casting Time: 1 swift action
Duration: 1 round/level
Finishing the spell, your eyes glow with a pale blue radiance, and you understand how to overcome your foe's resistance to your magic.
This spell gives you a +10 bonus on caster level checks to overcome the spell resistance of a specific creature. Assay resistance is effective against only one specific creature per casting, and you must be able to see the creature when you cast the spell.