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 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 as much as pleased.

Due to not being able to use any armor above chainmail, your options for defense are limited. 

You have Darkvision with a range of 60 feet.

Draconic wings that permanently let you fly. You have a Fly Speed 2x your Speed. Your wings appear to match the scales on your body. You can fly as much as you please as long as your not drained of energy.

The dragon parts of your body crave meat, as such other foods will making you sick which could knock you out of action for a few days via being stuck vomiting constantly.

In water you will do a Third of you typical damage and will be unable to take off, to exhausted to flap your wings. You will also move at a third of your speed.

Using Holy magic will do damage to you and weaken you to the point of not being able to move for 4 turns. Holy items also have a negative effect on you. Demonic items can strengthen you immensely.

If pushed to the brink of your limit to fear, stress, rage, or even near death you will get a burst of energy and strength. Be warned you will not be able to tell who is friend and who is foe in your enraged state.

Your spells are stronger and you cast much faster. Magic runs threw your blood naturally.