Forceblade (3.5e Equipment)
From D&D Wiki
A Forceblade weapon appears to be ghostly, translucent and often glowing as if made of a glassy version of its base material. As it is swung through the air it creates a gentle vroom vroom noise and crackles.
Force Weapons deal force damage instead of the normal slashing, bludgeoning, or piercing damage of the weapon, bypassing damage reduction, and being affected by any energy resistance to force, though such resistance is rare. For example, a Forceblade Longsword deals 1d8 + Str force damage.
A Forceblade weapon can strike at ghosts normally, and do not suffer the miss chance from their ethereal nature.