Draconic Ancestry. 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.

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

Draconic Form:Shifting. As a Bonus Action, you can shape-shift to assume a more draconic appearance. This transformation lasts for 1 minute or until you revert to your normal appearance as a Bonus Action.  You can shift a number of times equal to your Proficiency Bonus, and you regain all expended uses when you finish a Long Rest. Wile shifted you gain these benefits 

• You gain a natural armor class equal to 13+con mod when not wearing armor 

• You gain a claw attack that uses strength and deals 1d6+str mod

•at 5th level you sprout wings as part of your transformation and gain a fly speed equal to your walking speed for the duration of the form 

Breath Weapon. Starting at 3rd level When you take the Attack action, wile in the draconic form, 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 Ancestry 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.

at 7th level you can use this ability without being in the Draconic form.