Your Constitution score increases by 2, your Wisdom increases by 1, and your Dexterity decreases by 1.

Alternatively, you can use the flexible Ability Score Increase option.

You are a Large  or medium creature.

You can breathe air and water

Your base AC is 17 (your Dexterity modifier does not affect this number). You can use a shield and still benefit from this AC.

Your draconic heritage grants you access to one of the following attacks:

Steam Breath: As an action, you can unleash a burst of superheated steam in a 15-foot cone. Each creature in the area must make a Dexterity saving throw (DC = 8 + your Constitution modifier + your proficiency bonus) or take 1d10+constitution modifier fire damage, scaling by 1d10 at 5th, 11th, and 17th level. On a successful save, creatures take half damage. You may use this feature a number of times equal to your proficiency bonus, regaining all expended uses on a long rest.

Bite Attack: Your powerful jaws can be used as a natural weapon. Attack: Melee Weapon Attack, Strength to hit. Reach: 10 feet. Damage: 1d8 + strength modifier piercing damage. This damage increases by 1d8 at 5th, 11th, and 17th level. On a hit,

On a hit, the target must make a strength saving throw or become grappled (escape DC = 8 + your Strength modifier + your proficiency bonus). You can grapple only one creature at a time this way. You may use this feature a number of times equal to your proficiency bonus, regaining all expended uses on a long rest.

Your life in the deep has granted you some skills others might not have. You may choose proficiency in Nature or Athletics.

You can speak, read, and write Common, additionally you can choose between Draconic or Aquan.