Needs review
Source: Encyclopedia Arcane: Dragon Magic

Description: Your mind is a powerful tool when analyzing the power of magical defenses.

Prerequisites: Spell Penetration, INT 17

When attempting to counter or dispel a magical effect or attempting to penetrate a target’s Spell Resistance, the character can add his Intelligence modifier to his Caster check.

Normal

A Caster check is 1d20 plus the character’s caster level only.