Disrupting Weapon

Player's Handbook v.3.5 (PH)Core (3.5)
School
Transmutation
Casting Time
1 standard action
Components
V, S
Range
Touch
Target
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.