Wounding Critical

Type of Feat: Class Specific
Prerequisite: Swashbuckler 19
Specifics: On a critical hit, the Swashbuckler deals 2 Constitution damage to their opponent (In addition to Strength damage). This does not work against creatures immune to critical hits.
Use: Automatic.

(Note: To properly implement this feat, it is calculated separately from your actual critical hits. This means that sometimes you will get a special critical hit that does not deal extra damage, but instead deals Strength & Constitution damage. Your chance of critical hits remains the same though.)