Phoenix Heart

The elusive covenent calling themselves the Phoenix Heart sorcerers inherit their powers straight from the elemental plane of fire and their phoenix patrons. With their chests and eyes glowing with a warm orange light these masters of fire use their powers in no specific reasons or purpose. They all live extremely seperate lives only to meet up in times of great need and organise themselves as an independant fighting force against extraplanar invasions. Their covenent stands older than most empires and crowns, being formed by the phoenixes during the elemental calamity caused by Carsus' folly to fight the destructive forces of the other elemental realms and protect the material plane. Their names come from a ritualistic heart transplant in which the new members of the covenent have their heart replaced with a powerful arcane artifact called a Phoenix Heart that allows the innitiate to harness arcane power straight from the elemental plane of fire.
In the present day the covenent is quite small and lead by an old Firbolg called Olgis Firepit. When a member of the covenent dies another member is sent to retrieve the body so the Phoenix Heart can be given to a new member. Members of the covenent are easy to distinguish due to their glowing eyes and chest and the large surgical scar in the middle of their chest. 

Ignite

At 1st level, you gain the ability to start fires with a touch. As an action, you can magically ignite a flammable object you touch with your hand—an object such as a torch, a piece of tinder, or the hem of drapes.

Heart of The Phoenix

Your new heart empowers you and the magic you cast. Whenever you cast a leveled spell that deals fire damage you can create a fiery explosion upon impact that deals fire damage equal to half your sorcerer level (rounded down) to everyone within 5 feet of the original target. When you are hit by a melee attack you can create a similar explosion that hits everyone within 5 feet of you.
You can use this ability a number of times equal to your Charisma modifier. If you have no uses left, you can spend 2 sorcery points to use this ability.

Additionally you learn to speak, read and write primordial and Ignan

Winged Inferno

At 6th level you gain the ability to evoke the spirit of the phoenix within yourself.

As a bonus action you can enter a phoenix form. Upon activation you grow 2d6 inches, you gain a pair of flaming wings and your features appear singed. For the next hour you gain the following benefits:

• Your spells that deal fire damage ignore the targets fire resistance.
• You gain resistance to fire
• Your fire damage dealing spells can curve around corners and so ignore half and 3/4 cover.
• You can hover a foot off the ground and ignore difficult terrain.

Your phoenix form ends after an hour or if you are knocked unconcious. You can use this ability a number of times equal to half your level and at 18th level you are able to permanently stay in phoenix form.

Burning Blood

 At 14th level your Phoenix Heart pumps the blood of a phoenix into your veins. 

You gain the ability to freely transmute any spell that deals lightning, cold, acid, force, thunder, bludgeoning, piercing or slashing damage into dealing fire damage instead.

Additionally whenever you cast a spell that deals fire damage you regain hit points equal to spells level + your charisma modifier and whenever you perform a short rest you can add your charisma modifier to each hit dice you spend in addition to your constitution modifier.

Archon of Endless Fire

At 18th level you have ascended to one of the highest positions within the elemental plane of fire. Your soul burns with the light of the endless flame of the phoenix and you gain the following effects whenever you are in your phoenix form.

• You cast bright light at 30 feet and dim light at an additional 30 feet
• You are immune to fire damage and are resistant to non-magical slashing, bludgeoning and piercing damage.
• You gain a flying speed equal to double your base walking speed
• You can add your charisma modifier to the damage of all fire damage dealing cantrips
• Whenever you are lowered to 0 hit points you burst into a fiery explosion that causes any enemy within 20 feet of you to take fire damage equal to your player level.
• When you are lowered to 0 hit points and fail 3 death saves, the phoenix blood inside your veins resurrects you with half of your maximum hitpoints returned to you. You can only do this once in 14 days.
• When you cast a leveled spell that deals fire damage you can choose to do maximum damage instead of rolling, you can do this once between long rests.