Combat Caster Defense [Fighter] (from the Quintessential Fighter)
You can have fought many spellcaster and have learnt the trick they use to cast spells in the midst of battle. With your lightning fast reflexes, few spellcasters are able to use spells in combat when you are close.
Prerequisites: Fighter level 1st+, Dexterity 13+, Lightning Reflexes, BAB +5.
Benefit: Whenever you gain an attack of opportunity against an enemy spellcaster attempting to cast a spell, you force a -4 penalty to your enemy's Concentration check if they are damaged by your attack. In addition, you impose a -4 penalty on all Concentration checks made by enemy spellcasters to cast spells while on the defensive so long as you are within 5 feet of them.
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