Pyromainiac

Through your study of magic you've found a strange fascination with Elemental Plain of Fire. These wizards tend to be outcast because of there dangerous magical practices, with those who witness their obsession with fire deeming them pyromaniacs. Pyromaniacs draw power from the elemental plain of fire to cast  and enhance their fire spells.

Harness Fire

Beginning at 2nd level, you can draw fire from the elemental plain being able to cast fire ball at 3rd level once per long rest. You can cast it twice at level 11. You also gain resistance to fire damage if you don't already.

Scorching Flame

Starting at 6th level, spells that deal fire damage have an extra 2d6  fire damage. Fireball no longer requires components and now effects a 30ft radius.

Pyromainiac

Beginning at 10th level, you can add your Cha modifier to spells that deal fire damage. Creatures large or smaller that fail the Fireball Dex save are knocked prone.

Power of the Sun

Starting at 14th level, you can absorb so much fire you can now 3rd level fire ball 3 times as an action once per long rest.