Your innate magic comes from the gift of a dragon. Perhaps an ancient dragon facing death bequeathed some of its magical power to you or your ancestor. You might have absorbed magic from a site infused with a dragons power, perhaps the location where a great dragon was slain. Or perhaps you handled a treasure taken from a dragon's hoard, some precious item infused with draconic power. You might also wield draconic magic by virtue of your Dragonborn heritage.
At 3rd level when you take this subclass, the magic in your body begins to manifest physical traits of your draconic gift. Your Hit Point maximum increases by 3 and increases by 1 whenever you gain another Sorcerer level. Your body is also covered by dragon-like scales. While you aren't wearing armor, your base Armor Class equals 10 + your Dexterity modifier + your Constitution modifier.
Additionally, you have affinity with one damage type associated with dragons. Choose either Acid, Cold, Fire, Lightning, or Poison. You may add your Charisma modifier to one of the damage rolls when you cast a spell that deals damage of that type.
At 3rd level, you gain the ability to speak, read, and write Draconic. In addition, your speech can be understood by all creatures of the Dragon type.
At level 6, your affinity with dragons has deepened even further. You have resistance to the same damage type you chose in the Draconic Affinity feature. Additionally, when you cast a spell that deals damage, you can spend 1 Sorcery Point to change it's damage type to match the damage type you chose in the Draconic Affinity feature.
At 14th level, your innate magic manifests draconic wings. As a bonus action, you can sprout your wings, gaining a flying speed equal to your base walking speed. The wings last until you dismiss them as a bonus action.
You can decide whether the wings are spectral or physical.
At 18th level, you can channel the dread presence of dragons. As a Bonus Action, you can spend 10 Sorcery Points to draw upon this power. You assume the form of a dragon for 1 minute or until you are incapacitated, gaining the following benefits
Your size changes to Huge
You gain Temporary Hit Points equal to twice your level
You gain a flying speed of 80 feet (if you don't already have a faster flying speed)
You can use your Charisma modifier in place of Strength for ability checks and saving throws.
It no longer costs Sorcery Points to change a spells damage type to your chosen damage type.
As an action, you can use a breath attack that is either a 60 foot cone or 90 foot long line that is 5 feet wide (your choice when you use it). It deals 18d6 damage of the chosen type, or half on a successful dexterity saving throw. The DC is equal to your Spell Save DC. Once you use the breath attack, you cannot use it again until it recharges. At the start of each of your turns, you roll 1d6. If you roll a 1, you regain the use of your breath attack.
Once you use this feature, you cannot do so again until you finish a long rest.