Defending Against Spellcasters, Part V

5. If you have any kind of spellcasting ability, you can attempt to counterspell a spell thrown at you. This requires that:

a.) You ready the counterspell action, targeting the enemy spellcaster.
b.) You can identify the spell being cast (Spellcraft check DC 15 + spell level).
c.) You are prepared to cast the spell being thrown (or its opposite, e.g., Slow counters Haste).

If all of these are true, you can counter the spell automatically. Note that Dispel Magic can be used as an all-purpose counter against any spell, but does not work automatically. Instead, you must make a caster check against the enemy spellcaster (d20 + caster level vs. 11 + caster level).