Curse of Distraction [Hex]

Your Hexblade's curse can distract your opponent, making spellcasting difficult for him.
Prerequisite: Any other hex feat, hexblade's curse ability.
Benefit: When using your hexblade's curse ability, your victim must make a Concentration check in order to cast a spell. As a hexblade's curse the DC equals 15 + Spell level. As a greater curse, the DC is 20 plus spell level. As a Dire curse the DC is 25 + Spell level.