Your critical hits with spells cause additional magic effects.
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.
The Genius Guide To: Feats of Critical Combat. Copyright 2010, Super Genius Games. Author: Owen K.C. Stephens