Divine Iron

When holding an improvised metal object such as an anvil or a weapon with a heavy property such as a hammer or greatsword, the caster channels their divine rath through it; they then swing or hurl the metal object or weapon, making either a ranged spell attack roll or melee spell attack roll against the target. On a hit, the target takes 1d12 magical bludgeoning damage. 

Cantrip Upgrade. The damage increases by 1d12 when you reach levels 5 (2d12), 11 (3d12), and 17 (4d12).