Young dragon-tortleborn crawl for a few weeks after birth before learning to walk on two legs. They reach adulthood by the age of 15 and live an average of 50 years.

Dragon-tortleborn adults stand 5 to 6 feet tall and average 450 pounds. Their shells account for roughly one-third of their weight. Your size is Medium.

Your base walking speed is 30 feet and you have a swim speed of 30 feet. 

You can hold your breath for up to 1 hour at a time.

Due to your shell and the shape of your body, you are ill-suited to wearing armor. Your shell provides ample protection, however; it gives you a base AC of 17 (your Dexterity modifier doesn’t affect this number). You gain no benefit from wearing armor, but if you are using a shield, you can apply the shield’s bonus as normal.

When you take the Attack action on your turn, you can replace one of your attacks with an exhalation of magical energy in a 15-foot cone. Each creature in that area must make a Dexterity saving throw (DC = 8 + your Constitution modifier + your proficiency bonus). On a failed save, the creature takes 1d10 fire damage. On a successful save, it takes half as much damage. This damage increases by 1d10 when you reach 5th level (2d10), 11th level (3d10), and 17th level (4d10).

You can use your Steam Breath a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.