Spell Opportunity
( Epic Level Handbook, p. 67)[Epic]
You can cast a touch spell as an attack of opportunity.
Prerequisite
Combat Casting (PH) , Combat Reflexes (PH) , Quicken Spell (PH) , Spellcraft 25 ranks,
Benefit
Whenever you are allowed an attack of opportunity, you may cast (and attack with) a touch spell as your attack of opportunity. This incurs attacks of opportunity just as if you had cast the spell normally.
Normal
Without this feat, you can only make a melee attack as an attack of opportunity