Spell Critical (Combat, Critical)

Your critical hits with spells cause additional magic effects.

Prerequisite: Critical Focus, BAB +9, CL 9

Benefit: Select one 1st-level spell you know that affects a single target and is negated with a saving throw. When you score a critical hit with an attack for a spell, the target is also affected as if you had cast the selected spell upon it. The additional spell effect lasts for its normal duration or 1 minute, whichever is shorter.

Special: You can apply the effects of only one critical feat to a given critical hit unless you possess Critical Mastery.