Path of the Hammerer

The Path of the Hammerer is a subclass for the Barbarian class. The past of a smithy or a carpenter has ranted you greater abilities beyond that of any other Barbarian.

Magic Metallurgy

Starting when you choose this path at 3rd level, when you enter a rage, you can choose to enter a state of Magic Metallurgy. If you do so, for the duration of your rage you have immunity to normal arrows, advantage on CON saving throws having to do with external forces, and you gain +3 to your armor class. In turn, your movement speed is halved, you cannot swim, and you have a weakness to thunder damage.

Flames of the Forge

Beginning at 6th level, you can use Flames of the Forge as a bonus action to add 1d4 fire damage to your next attack.

Temperance

Beginning at 10th level, Magic Metallurgy gives an additional +2 to your armor class. You also gain small spikes, so when an attack does not reach through your armor class, the attacker takes 1d4 piercing damage.

Razor Edge

Starting at 14th level, using your bonus action while Magic Metallurgy is active, you can make the outside of your arm as sharp as a blade and attack with it. You make an attack roll as though it were an unarmed strike and deal 1d8 + STR modifier slashing damage. It will turn back to normal after the attack is made.