Blazing bloodline (Pyromancer)

As a sorcerer you are a being of pure magical energy. In your case you were born from a flame, an entity of heat. Flame & brimstone bend to your will, you are the embodiment of flames, anger and passion! You run hot and your temper is wild. 
Defence is for cowards, your enemies can't hurt you if they're lit ablaze by your hands!

Fiery nature

Your scorching bloodline grants you unique physical attributes:

Your body's average internal temperature is 70°C and its average external temperature is 45°C. You suffer no negative effects from this and neither does your equipment. Depending on your emotional state this can fluctuate drastically. You are naturally accustomed to hot climates & high temperatures. 

At 1st level, you gain resistance to fire damage. In addition to this you learn the produce flame and control flames cantrips. You can also cast burning hands as a 1st level spell once per long rest without expending a spell slot.

 

Fire bender

At 1st level, due to your close bond to the flame when you harness its power it bursts from you in spectacular fashion.

When you cast a spell of 1st level or higher that deals fire damage, a stream of fire erupts from your body, hurling itself at a creature of your choice within the spell's range. The target takes 1d4 fire damage. This increases to 2d4 at 6th level, 3d4 at 14 level & a 4d4 at 18th level.

Empowered flames

At 6th level, your fire burns brighter and hotter than ever before. When you cast a spell that deals fire damage, you may add your charisma modifier to one damage roll of that spell.

Fire plumes

At 14th level, you gain the ability to create plumes of fire from your hands, shoulders and feet, gaining a flying speed equal to your current walking speed. You can create these as a bonus action on your turn. They last until you dismiss them as a bonus action on your turn.

 

Avatar of flame

At level 18, you have become one with fire, you have dominion over heat itself & set ablaze anything in your path. You gain the following benefits:

Everlasting fire: Your soul burns with such fury that temperature no longer effects you. You have immunity to fire damage.

You may spend 8 sorcery points as a bonus action to transform yourself into a fiery form. Channelling the pure destructive energy of Kossuth through your burning soul you gain the following abilities:

Dragon's breath: As an action you emit a 30ft cone of fire that rends all those in the effected area. Each creature present must make a dexterity saving throw or take 10d10 fire damage on a failed save and half as much on a success. You can use this ability once per transformation.

Flame geyser: As an action you call up molten rock from beneath the earth. A 30 ft sqaure from a point within 60ft of you erupts with magma and fire. Any creature that starts or ends its turn in this radius must make a dexterity saving throw or take 8d8 fire damage on a failed save and half as much on a success. This ability lasts for one minute or until you dismiss it as a bonus action. You can use this ability once per transformation.

These are not affected by "Fire bender" or "Empowered flames".

You remain in this form for 1 minute. It ends early if you are incapacitated, if you die, or if you dismiss it as a bonus action.