Draconic transformation

Now as an action :

You transform into a large dragon that is quadrupedal with a streamline serpentine body. You stand poised and regal with wings neatly folded at your side and a long tail swaying gracefully behind you. The aesthetics of the form is determined by the player. Spellcasting is not possible while transformed however, your new draconic form gives you the following benefits:

*Your new size is Huge. You cannot transform if the space you are occupying will not accommodate your new size.

*your scales give you a new ac of 19 and Resistance to elemental damage of your type

*your newfound might gives you a +6 to Attacks and damage 

* claws grow for attacks doing 2d6 slashing damage

* you gain a bite attack that does 2d10 piercing damage

*A flight speed equal to 15 + your base walking speed

*A tail that can be used in combat for 2d8 bludgeoning damage

* A breath weapon, if your race does not already grant one, that does 6d6 elemental damage. Please choose a dragon subtype from the Draconic Ancestry table to determine your damage type, resistance, and range of your breath weapon. If one is already granted to you due to your race please use the damage rules specific to your race's breath weapon.

The transformation lasts for 5 minutes but can be dispelled early by using an bonus action. Once the transformation is broken you suffer the following:

* You than take one level of exhaustion and you become prone

* after using this feature once you can not do so again until your next long rest