Type: Divine
Source: Fiendish Codex II
You can channel divine energy to counter spells without readying an action in advance.
Prerequisite: Divine caster level 3rd, ability to turn or rebuke undead.
Benefit: You can spend one of your turn or rebuke undead attempts as an immediate action to counter a spell or spell-like effect. For example, if an evil cleric targets Jozan with a hold person spell, as an immediate action, Jozan can spend a turn undead attempt to counter the spell if he had prepared a hold person or dispel magic spell.
You must have the relevant spell prepared as normal (or dispel magic), and you must make a Spellcraft check to identify the target's spell if applicable.
Normal: You must typically use a readied action to counter an enemy's spell.