Ghost Weapon

Enchantment
A weapon enchanted with this spell affects ghosts (and other insubstantial
beings and spirits) as if they were tangible. If the weapon itself is made
intangible (through whatever means the GM deems feasible), the weapon
still affects the physical world at the whim of its wielder.

Energy cost to cast: 250 per pound of weight (minimum 1 pound).
Prerequisites: Enchant (VH) and Magic and Abilities/Spells/Necromantic Spells/Solidify.