You can increase two different ability scores of your choice by 2.

You have a primary breath weapon option according to your species. The saving throw DC of your breath weapons is equal to your dragon save DC.and damage of your breath weapon are determined by your class (see the Dragon breath weapon table), while the type of damage dealt by your breath weapon and its saving throw type is determined by your species. On a successful saving throw, a target takes half damage from your breath weapon.

Once you have used a breath weapon, you cannot use this feature again until you recharge it. To recharge it, roll a d6 at the end of each of your turns. On a 5–6, your breath weapon recharges. Your breath weapon also recharges when you finish a short or long rest.

You have draconic ancestry. Choose one type of dragon from the Draconic Ancestry table. Your breath weapon and damage resistance are determined by the dragon type, as shown in the table.

You are immune to the type(s) of damage your breath weapon deals (determined by your species).

 Certain features and attacks deal damage of your energy type, which is determined by your species. If an effect deals multiple types of damage, damage of your energy type is divided evenly between those damage types (rounded down).

Draconic Ancestry

Dragons are typically born with an alignment according to their species. You are free to choose any alignment you wish, but know that choosing one atypical of your species may bring harsh judgment from others of your kind.

Your size is based on your Constitution, as detailed in the Features by Constitution table.

Your speed is based on your size, as detailed in the Features by Constitution table.

You can speak, read, and write Draconic.

As an action, you can magically polymorph into a humanoid or beast with a challenge rating no higher than your character level or back into your true form. You revert to your true form if you die. Any equipment you are wearing or carrying is absorbed or borne by the new form (your choice). In a new form, you retain your alignment, hit points, Hit Dice, ability to speak, proficiencies, Intelligence, Wisdom, and Charisma scores, and the Change Shape action.

Additionally, while you are in the form of a humanoid, you retain your Spellcasting feature, regardless of the effect used to assume your new form.

You gain more power as you age. While you may grow in power through combat experience, you cannot advance to the  next age category until  you reach 7th level, 13th Level, and 19th Level.