Path of Embers

Cruel Flare

Starting at 3rd level when you choose this subclass, your strikes begin to burst into a glorious display of flame.   Whenever you hit a creature with a weapon attack while raging, it takes an additional 1d4 fire damage.   The damage increases to 2d4 at 6th level, 3d4 at 10th level and 4d4 at 14th level.   In addition, you become resistant to fire damage while raging.

Pyre Starter

Starting at 3rd level, you can use your action to touch a flammable object that fits within a 5 foot cube or smaller that isn't being worn or carried (such as a pile of wood or a bale of hay) and cause it to ignite. At 10th level, you can ignite objects that fit within a 10 foot cube or smaller.

Armour of Ignition

At 6th level, you can channel your fury into a protective force, scorching all who approach you.   While raging, you can use a bonus action to channel your internal flames. If you do so, your AC increases by 2 and hostile creatures take fire damage equal to your Constitution modifier if they enter within 10 feet of you or start their turn there. This ability lasts until your rage ends.   When your rage ends, make a DC 10 Constitution saving throw, gaining 1 level of exhaustion on a failed save. The DC of this saving throw increases by 3 every time you use this ability, resetting to 10 when you finish a long rest.

Eternal Sun

Starting at 10th level, you gain the following effects:

• If you are within 5 feet of a fire that is the same size as you or larger and there is another fire within 30 feet of you, you can use a bonus action and spend 5 feet of movement to teleport to a space within 5 feet of either fire.
• You become immune to the effects of extreme heat, as described in the Dungeon Master's Guide.
• You become immune to fire damage while raging.

Inferno Plume

Starting at 14th level, your flames can raze the paths you tread.   As a bonus action on your turn, you can create a stationary sphere in a 30 foot radius that lasts until your rage ends. Creatures that enter the area or start their turn there must make a Constitution saving throw (DC= 8 + Proficiency bonus + Strength modifier), taking fire damage equal to your barbarian level on a failed save and half that on a successful save. You can use this ability a number of times equal to your Constitution modifier (a minimum of once), regaining all uses upon finishing a long rest.   In addition, Whenever you deal fire damage to a creature while raging, you ignore resistance to that fire damage and treat immunity as resistance to that damage.