Your lineage stems from a dragon progenitor. Choose the kind of dragon from the Draconic Ancestors table. Your choice affects your Breath Weapon and Damage Resistance traits as well as your appearance.

Breath Weapon. When you take the Attack action on your turn, you can replace one of your attacks with an exhalation of magical energy in either a 15-foot Cone or a 30-foot Line that is 5 feet wide (choose the shape each time). Each creature in that area must make a Dexterity saving throw (DC 8 plus your Constitution modifier and Proficiency Bonus). On a failed save, a creature takes 1d10 damage of the type determined by your Draconic Essence trait. On a successful save, a creature takes half as much damage. This damage increases by 1d10 when you reach character levels 5 (2d10), 11 (3d10), and 17 (4d10).

You can use this Breath Weapon a number of times equal to your Proficiency Bonus, and you regain all expended uses when you finish a Long Rest.

You have Resistance to the damage type determined by your Draconic Ancestry trait.

You have Darkvision with a range of 60 feet.

When you reach character level 5, you can transform as a Bonus Action using one of the options below (choose the option each time you transform). Once you transform, you can’t do so again until you finish a Long Rest.

Here are the transformation options:

True Dragon

False Person

Your draconic jaws can be usedto hold weapons just as dexterously as a Humanoid’s hands. You can use your mouth to interact with objects, perform Somatic components, and hold weapons. When you do so, you ignore a weapon’s Two-Handed property, and you can perform Somatic and Verbal components even while holding a weapon in your mouth, but you are unable to dual wield.

You have a base Armor Class of 17 (your Dexterity modifier doesn’t affect this number). You can’t wear Light, Medium, or Heavy Armor and you cannot don Shields.