Transmute Weapon

Level: 4
Range: 30 ft.
Target: One weapon
Duration: 5 rounds
Your words fundamentally alter the material of which a weapon is made, transforming it according to your whim.
A weapon targeted with this utterance can be changed into a special material (DMG 283) of your choice. You can make a weapon cold iron, adamantine, alchemical silver, or whatever other special material you wish. The weapon is treated as if made of that substance, and its hardness, hit points, and the damage it deals might be affected depending on your choice.