Path of the Burning Fuse

Some tribes of barbarians see the destructive power of firearms as a sign, that the times are changing. The sea of fire and smoke ushers in a new age of violence, and those barbarians will be at the forefront. They are armed with the heaviest guns they can find and carry, and are just as likely to pummel their enemies with their guns as they are to shoot them.

They focus on aspecs of fire, efficiency and excessive force. Their fanaticism even brings them to lighting themselves on fire, and becoming a burning weapon. Alas, few oof these barbarians live long, as they burn their candle in both ends and are consumed by the flames that drive them

Firepower

At 3rd level, Whilst raging you become resistant to fire damage. You also gain +20 feet of movement when on fire.

Cannon Fodder

Starting when you choose this archetype at 3rd level, you gain proficiency with firearms, allowing you to add your proficiency bonus to attacks made with firearms. you can use heavy firearms as melee weapons dealing 1d10 bludgeoning damage + your strength modifier. The firearm retains its heavy and two-handed properties when wielded this way, if it had them. You are proficient attacking in this way with firearms, and may thus add you proficiency bonus to the attack roll.

Fire at Will

From 6th level, if on fire, you may make a ranged attack with a heavy firearm as a bonus action. Furthermore you may set yourself ablaze as a free action when you are raging.

Maximum Thrust

Starting at 10th level, by using the blowback of your heavy firearm, you are able to propel yourself forward with prodigious speed. You can use an action to blast off in any unoccupied direction to a distance of up to 30 ft.

When you launch, a fire blaze shoots out in a 5 feet radius. Creatures within this radius must make a dexterity saving throw, or be set ablaze, taking 1d10 fire damage until they or a creature within 5 ft. of them put out the fire as an action. This action requires gunpowder.

Firefighter

Starting at 14th level, you become resistant to fire, even when you’re not raging. When raging you become immune to fire damage.

Grapeshot

At 14th level, as an action, you can load your heavy firearm with shrapnel, rocks or debris in a 15 feet cone in front of you. Creatures in the cone, must make a dexterity saving throw, or take 8d8 bludgeoning, slashing or piercing damage (Depending on the ammunition). If they are successful they take half the damage. You can do this once pr. short or long rest.