Bind to hell

The targeted weapon shudders and momentarily emits a moaning chorus, like that of damned souls.
This spell places an infernal blessing on the touched weapon for the specified duration.
Upon casting the spell, you must name or describe a specific creature.
If that creature is subsequently reduced to —10 or fewer hit points by a blow from the target weapon before the spell's duration expires, its soul is whisked immediately into the hilt of the sword which must be adorned with a holy symbol of levistus