Sunder Breaker

Abjuration [force]
Level: Artificer * 1, Magus * 1, Sorcerer */Wizard * 1
Components: V, S
Casting Time: 1 Standard Action
Range: touch
Target: creature touched
Duration: 1 minute/level or until discharged (D)
Saving Throw: Will negates (harmless), see text
Spell Resistance: yes (harmless), see text
  You place an Invisible ward upon the target. The next time a creature succeeds at a Sunder combat maneuver against the target, the attacker's weapon takes 1d6 points of damage per Caster Level (maximum 10d6). If the attacker used a Natural Weapon for the Sunder, the attacker takes half this damage. Spell resistance applies to this damage. The attacker can attempt a Fortitude Save to halve this damage.
  The ward on the target counts as a magical trap and can be detected and Disabled as such.