Elemental blade

A nonmagical group of objects of the same type are wreathed in the caster's magic and become a weapon of choice that the caster is proficient with. These weapons deal additional damage based on what material they are made from. Stone and earth based materials, not including coal, deal physical damage(bludgeoning, piercing, slashing). Ice deals cold damage. coal, ash, and dry or already burning wood deal fire damage. bones or previously living body parts deal necrotic or poison damage based on the creature it came from. 

Each weapon made keeps the same base stats that the nonmagical version would have with 1d6(add 2d6 each additional spell casting level after 3rd) extra damage based on material used.