Chosen of Evil

Prerequisite(s): Con 13+, Any other Vile feat.
Benefit: As an immediate action, you can take 1 point of Constitution damage to gain an insight bonus equal to the number of vile feats you have, including this one. Until the end of your next turn, you can apply this bonus on one attack roll, saving throw, ability check, or skill check. Make this decision before determining the result of the roll.
Source:Elder Evils