Base Class: Sorcerer
Your innate magic comes from the power of elemental fire. Many with this power can trace their magic back to a near-death experience caused by flames, but perhaps you were born during a forest fire so massive that folk still tell stories of it, or your lineage might include the influence of potent fire creatures such as an Efreeti. Whatever the case, the magic of the blaze permeates your being.
Pyromancers are invaluable members of a warband. Their magic allows them to expel incredible quantities of flame, allowing them to replace many flame-based war machines on their own.
Heart of Fire
Whenever you start casting a spell of 1st level or higher that deals fire damage, fiery magic erupts from you. This eruption causes creatures of your choice that you can see within 10 feet of you to take fire damage equal to half your sorcerer level (minimum of 1).
You also gain the ability to speak, read, and write in Primordial.
Fire in the Veins
At 6th level, you gain resistance to cold and fire damage. In addition, spells you cast ignore resistance to fire damage.
Explosive Fury
Starting at 14th level, when you are hit by a melee attack, you can use your reaction to deal fire damage to the attacker. The damage equals your sorcerer level. The attacker must also make a Strength saving throw against your sorcerer spell save DC. On a failed save, the attacker is pushed in a straight line up to 20 feet away from you.
Fiery Soul
At 18th level, you gain immunity to cold and fire damage. In addition, spells you cast ignore immunity to fire damage.
You also gain a magical flying speed of 90 feet.
The addition of the Fly Speed is brilliant. Really makes that feel like a Capstone.