Forgefire Hammer
When you hit with this warhammer, the attack deals an extra 1d6 fire damage. If the fire damage die rolls a 6 against a target that is made of metal or holding metal, it must make a DC 15 Constitution saving throw.
Complete rules
Forgefire Strike When you hit with this warhammer, the attack deals an extra 1d6 fire damage. Heat-Fear (Metal) If the fire damage die rolls a 6 against a target that is made of metal or holding metal, it must make a DC 15 Constitution saving throw. On a failure, it takes an additional 2d6 fire damage and drops one held metal item (its choice if multiple). On a success, it takes half of the additional damage and does not drop the item. Magma Spend The hammer has 3 charges and regains all expended charges daily at dawn. When you deal fire damage with the hammer, you may expend 1 charge to maximize one fire damage die from this weapon (your choice).