Daily Punch 8-15-16 Strike Break Spell for Pathfinder

CASTING

Casting Time 1 immediate action
Components V, S

EFFECT

Rangeclose (25 ft. + 5 ft./2 levels)
Target one creature
Duration instantaneous

DESCRIPTION

You respond to a creature being subject to a critical attack, and surround the target in impenetrable force.  The target of the spell gains +20 to its AC for the confirmation of a critical attack against the target.  After the attempt to confirm the critical strike, the subject no longer has the benefit of this spell.