Fracturing Weapon(The Forge of War, p. 113)
Level: Hexblade 3, Assassin 4, Blackguard 4, Duskblade 4, Paladin 4, Cleric 5,
Components: V, S, DF,
Casting Time: 1 standard action
Target: Melee weapon touched
Duration: 1 round/level
Saving Throw: Will negates (harmless, object)
Spell Resistance: Yes (harmless, object)
Once per round for the spell's duration, the wielder of the targeted weapon can declare a single melee attack to be a fracturing blow. If that attack successfully deals damage to an opponent, the foe takes a —5 penalty to Armor Class and damage reduction (if any, to a minimum of 0).
The penalties are applied after the damage from the fracturing weapon attack has been resolved. The penalties last for a single round, but the wielder can attack it again on his or her next turn and attempt to reinvoke the penalty.