Disrupting Weapon

Level: Clr 5
Components: V, S
Casting Time: 1 standard action
Range: Touch
Targets: One melee weapon
Duration: 1 round/level
Saving Throw: Will negates (harmless, object); see text
Spell Resistance: Yes (harmless, object)

This spell makes a melee weapon deadly to undead. Any undead creature with HD
equal to or less than your caster level must succeed on a Will save or be destroyed
utterly if struck in combat with this weapon. Spell resistance does not apply
against the destruction effect.