Pierce Magic Resistance
Components: V, S, M
Casting Time: 5
Area of Effect: 1 Spell
Saving Throw: None
Pierce magic resistance makes another spell more potent: It pierces magic resistance and some spells that shield a target from spells. Casting pierce magic resistance affects only the spell a wizard casts in the next round. If the target of the
second spell has magic resistance, its magic resistance check is rolled twice . Unless both checks
succeed, the spell pierces the creature’s magic resistance.
For example, if Therdillion the Invoker casts pierce magic resistance, then a disintegrate spell at a creature with 50% magic resistance, the DM rolls the resistance twice to see if it proves effective . Unless both resistance rolls succeed, the spell gets through, forcing the creature to make a saving
throw against the disintegration spell . If the saving throw is failed, the creature is disintegrated.
The pierce magic resistance spell has a 50% chance of chance of instantly dispelling protections against spells of 5th level or less, including shield, gaze reflection, minor globe of invulnerability, protection from cantrips, protection from weapons (any), protection from magic (any), as
well as any wall spell within these limits, including wall of force .
Nonmetal protective charms and amulets that add +2 or less to saving throws vs . spell must make a saving throw vs, disintegration or shatter after the saving creature’s saving throw is resolved.
The material component is a small iron spike or knife.
Reference: Wizards Spell Compendium; Volume 3; Page 666