You can strike at enemy spellcasters who fail to cast defensively when you threaten them.
Prerequisites: Disruptive, 10th-level fighter or Samurai
Benefit: Enemies in your threatened area that fail their checks to cast spells defensively provoke attacks of opportunity from you.
Essentia: You gain +1 to Hit & +2 Damage / Essentia on that AoO
Normal: Enemies that fail to cast spells defensively do not provoke attacks of opportunity.