Sources: Player's Handbook
Forgotten Realms Campaign Setting
Epic Level Handbook
You understand the nuances of magic to such an extent that you can counter your opponents' spells with great efficiency.
Benefit: When counterspelling, you may use a spell of the same school that is one or more levels higher than the target spell.
Normal: Without this feat, you may counter a spell only with the same spell or with a spell specifically designated as countering the target spell.