Ghost Touch Weapon(Libris Mortis: The Book of Undead)
Level: Cleric 4,
Components: V, S,
Casting Time: 1 standard action
Range: Close (25 ft. + 5 ft./2 levels)
Target: One weapon or fifty projectiles (all of which must be in contact with each other at the time of casting)
Duration: 10 min./level
Saving Throw: Will negates (harmless, object)
Spell Resistance: Yes (harmless, object)
Ghost touch weapon makes a weapon magically capable of dealing damage normally to incorporeal creatures, regardless of its enhancement bonus.
(An incorporeal creature's 50% chance to avoid damage does not apply to attacks made with weapons under the effect of this spell).
A ranged weapon affected by this spell does not bestow the ability on its ammunition.
The weapon can be picked up and moved by an incorporeal creature at any time.
A manifesting ghost can wield the weapon against corporeal foes.
Essentially, a weapon under the effect of this spell counts as either corporeal or incorporeal at any given time, whichever is more beneficial to the wielder.