Base Class: Barbarian
FORGE
Strike When It's Hot
Your hands burn with the perpetual flame of the forge and all of your ancestors who spent their lives stoking them. While raging, your melee weapon attacks deal additional fire damage equal to your proficiency bonus.
Skilled Smith
You gain increased skill at smithing and enchanting equipment as you gain levels. You gain proficiency with Smith's Tools and Intelligence(Arcana) checks. If you already have proficiency, your proficiency bonus is doubled for those ability checks.
At level 11, the progress made crafting or enchanting equipment is doubled for each individual while working on them. A group can only gain the benefit of this feature once per crafting session.
Immolation Aura
As a bonus action, you cover yourself in the flames of the forge for 1 minute. You gain resistance to fire damage and immunity to non-magical heat effects. In addition, at the start of their turn, all creatures within 10 ft. of you take fire damage equal to half your barbarian level (rounded down). This can be used once per short or long rest. On subsequent turns, you can use a bonus action to shoot fire from your aura at a single target within 30 ft. of you. If they fail on a dexterity saving throw, they take 2d6 fire damage. This saving throw DC is Constitution based.
Instant Upgrade
The Forge God watches over you, shielding you and your allies from harm or sharpening their steel. When an ally within 30 ft. of you is attacked, you can use your reaction to grant them resistance to bludgeoning, piercing, and slashing damage for the rest of the turn. Alternatively, when an ally within 30 ft. of you attacks with a weapon, you can use your reaction to grant them advantage on the attack roll. Both of these must be decided before the attack rolls are made. You can use this feature a number of times equal to your proficiency bonus.
Magical Resilience
Your time spent creating magical items has inured you to aberrant magic. While raging, you can use your reaction to gain advantage on a saving throw against a spell effect you can see. If you succeed on the saving throw that would deal half damage on a success, you instead take no damage. You can use this feature a number of times equal to your proficiency bonus.