Pyromaniac

Uses exclusively fire related spells

Class spells and resistances.

 Starting at 2nd level you gain a Resistance to fire damage. And starting at 10th level you gain immunity to fire damage and a resistance to radiant damage.

Adept of the flame

Beginning when you select this school at 2nd level, the gold and time you must spend to copy a fire related spell spell into your spellbook is halved.

Hellish rebuke

If you take cold damage greater than your maximum hit points which ends up killing you you can sacrifice 5 spell slots or more of level 2 or higher you can choose to come back to life with 1 hit point or deal damage equal to 3 times the amount of spell slots expended to the creature that killed you.

Volcanic strike

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Starting at 6th level, your melee attacks now deal fire damage equal to the damage to of the melee weapon

Flame shield

Beginning at 10th level, you can use your action to wreath yourself in flame increasing your AC by +2. Furthermore, any melee attack against you deals 5 fire damage to the attacker. Resistances and immunities ignored.

Flame pillar

Starting at 14th level, you can use an action to summon a meteor at any location within 30ft of you that you can see. On impact anyone within 10ft of the meteor takes 2d6 fire damage and 1d6 bludgeoning damage. After the meteor hits, a pillar of flame sprouts from the burned area and burns anything within a 5ft radius dealing 2d8 fire damage for each turn within the area.

each turn after the pillar is active, the caster can use a bonus action to move the pillar 10 feet in any direction. Alternatively, the caster can use 1 action to suck any enemy in a 20 foot area towards the pillar. A DC-15 dexterity check is needed to escape the pillars grasp.

the pillar is dispelled after 1 minute or until dispelled requiring no action.