Fiendish Bloodline

Your innate magic comes from the Abyss or the Nine Hells and its denizens. Only fiends of great power have the capacity to awaken sorcerous bloodlines. As such, most parties are wary of welcoming such sorcerers into their fold. Infernal sorcerers are frequently simply pieces of an archdevil's grand scheme, whereas abyssal bloodlines are often less premeditated. Perhaps your ancestry traces back to a high priest of the cult of Asmodeus, to whom the lesser god himself bestowed a boon, or are a fruit of Grazz't's endless carnal pursuits, intentional or otherwise. Whichever the circumstance that led the gift, most fiends realize that the denizens of the Prime Material Plane are free spirits. For every sorcerer who follows an archdevil's grand design to the letter, there is one who openly defies his intended purpose to his last breath.

Diabolical Mind

You can speak, read, and write your choice of abyssal or infernal, and when you make a Charisma check while interacting with fiends, your proficiency bonus is doubled if it applies to the check.

Fiendish Resilience

Starting at 1st level, your hit point maximum increases by 1 and increases by 1 again whenever you gain a level in this class. Additionally, your skin becomes tough, as if weathered by hell itself. When you aren’t wearing armor, your AC equals 13 + your Dexterity modifier.

Fiendish Adaptation

Starting at 6th level, you are able to gain one supernatural power of your choice from an fiend of a CR 1/3 your level or lower. You can use this power for one minute at a time, once per short rest. You may recharge this ability early by spending two sorcery points.

Fiendish Step

Starting at 14th level, you gain the ability to step into a flame move through it to any location within range. As a bonus action, you can step into a flame and magically teleport up to 120 feet to an unoccupied space you can see. Your arrival in the new space is preceded by a disembodied casting of the produce flame cantrip.

Paradise Lost

Starting at 18th level, you gain a fly speed equal to your base walking speed. When you use Fiendish Adaptation, you may pick all of the supernatural features of a creature, instead of one. Additionally, you gain Fire immunity, as well as resistance to nonmagical piercing, slashing, and bludgeoning.