HEART OF FIRE

You gain resistance to fire damage. Moreover, whenever you cast a level 1 sorcerer or higher that deals fire damage, any hostile creature that starts its turn within 10 feet of you before the start of your next turn to take fire damage equal to your sorcerer level.

BURNING WRATH

While under the effects of your Surge feature, you have immunity to fire damage and you ignore resistance to fire damage.

PYROMANIA

The flames you conjure onto the world spread like wildfire.

When you cast a sorcerer spell that deals fire damage, you can expend 1 sorcery point to cause any creature of your choice within 10 feet of the target of the spell to make a Dexterity saving throw. On a failed save, a creature takes half as much fire damage dealt by the spell.

KINDLE THE FLAME

You have mastered the roaring flames of elemental fire that burns within your soul, causing you to become more elemental than mortal.

You no longer need to eat, drink, or sleep, and you are immune to fire damage.

In addition, when you cast a level 1 spell or higher that deals fire damage, you can choose to immediately gain temporary hit points equal to the level at which the spell was cast + your Charisma modifier.

PRIMORDIAL INFERNO

The flame you wield burns your enemies to their core.

When you cast a spell that deals fire damage, you can treat immunity to fire damage as resistance to it.