Pierce Magical Concealment

 
Prerequisite(s): Con 13+, Blind Fighting, Mageslayer
 
Benefit: Your contempt for magic allows you to disreguard the miss chance granted by spells or spell-like abilities that create concealment (i.e.: Darkness, Blur, Invisibility, Etc.). In addition, mirror image has no effect on you. This ability does not cancel normal concealment. If you are a spellcaster and you take this feat, your caster level and spell DCs is reduced by 4 levels for all spells and spell-like effects.
 
Source: Complete Arcane