(General)
You can modify a variety of your spells to use as counterspells.
Prerequisites
Caster level 7th, any lawful alignment.
Benefit
The DC of your
Spellcraft check to identify an opponent's spell is equal to 20 + the spell level of the opponent's spell, but for your counterspell you can cast any spell from the same school of your foe's spell. The level of the spell used to counterspell must be equal to or higher than the level of your foe's spell.
Normal
The
Spellcraft DC to identify an opponent's spell is equal to 15 + the spell's level. Generally, a spell can only counter itself.