Your critical hits with spells cause additional magic effects.
Benefit: Select one 1st- or 2nd-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 in a school for which you have Spell Focus, 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.
The Genius Guide To: Feats of Critical Combat. Copyright 2010, Super Genius Games. Author: Owen K.C. Stephens