Sickening Critical (Combat)
Your critical hits cause opponents to become sickened.
Prerequisites: Critical Focus, base attack bonus +11.
Benefit: Whenever you score a critical hit, your opponent becomes sickened for 1 minute. The effects of this feat do not stack. Additional hits instead add to the effect's duration.
Special: You can only apply the effects of one critical feat to a given critical hit unless you possess Critical Mastery.