Base Class: Sorcerer
Within you is an unquenchable flame, a raging inferno that never ceases. Your very being is infused with the primal element of fire, to be unleashed at your command. You can bend and snuff out flames with a gesture, or summon great firestorms to annihilate all in your path. Whether you were born with this power or gifted it by a powerful being from the elemental plane of fire, you are the embodiment of destruction, powerful, and at times uncontrollable.
Inner Flame
At 1st level, you can call upon your inner fire to produce small flames with ease at any time.
You gain the Produce Flame cantrip and can cast it as a sorcerer cantrip. This cantrip doesn’t count against the number of sorcerer cantrips you know.
Arcane Furnace
Also at 1st level, the ever-burning flame within you surges greater when you use your arcane magic, fuelling your fire spells to even greater heat.
Whenever you cast a Sorcerer spell of 1st level or higher that deals fire damage, you gain a number of charges equal to the level of the spell slot used. You can store a maximum number of charges equal to your Sorcerer level plus your Charisma modifier.
Whenever you would roll fire damage for a Sorcerer spell of 1st level or higher that you cast, you can expend any number of stored charges (no action required) to deal additional fire damage to one creature harmed by your spell. The extra damage is equal to the number of charges you choose to expend. You cannot expend charges on the damage roll of the same spell you acquired them from, and must cast a new spell to utilize them.
Whenever you finish a long rest, the number of accumulated charges resets to zero.
Scalding Form
At 6th level, you gain resistance to fire damage and you can tolerate temperatures as high as 60 degrees Celsius (140 Fahrenheit) without additional protection and suffer no penalties from extremely hot environments.
Additionally, your scorching hot skin harms those that try to strike at you. Whenever a hostile creature hits you with a melee weapon attack or attempts to Grapple or Shove you, they suffer fire damage equal to your Constitution modifier.
Fiery Transportation
When you reach 14th level, your connection to the primordial energies of fire transcends your physical form.
As an action, you can expend a Sorcery Point to teleport to any visible open flame of at least 5 feet diameter that you can see, up to a distance of 120 feet away. If there is not enough space for you to appear, you are shunted 5 feet to the nearest unoccupied space in whatever direction you choose. If no space is available, the teleportation fails, but the charge is not wasted.
When you appear at your destination, you can send out a burst of flame in a 10-foot-radius around you. Creatures caught in the area suffer fire damage equal to half your Sorcerer level (rounded down) unless they are behind total cover.
Living Inferno
At 18th level, having become one with your internal blaze, you gain immunity to fire damage.
Additionally, once per long rest, when you would be reduced to 0 hit points, you are instead immediately healed half your maximum hit points and explode with scorching flames. All creatures of your choice within 30 feet of you must succeed on a Dexterity saving throw against your Spell DC or suffer 10d6 fire damage on a failed save, or half as much damage on a successful one.