Your Strength score increases by 1, your Constitution score increases by 1 and your Intelligence score increases by 1.

Young dragonshells grow quickly. They walk hours after hatching, attain the size and development of a 10-year-old human child by the age of 3, and reach adulthood by 20. They live to be around 280 .

Dragonshell's tend to extremes, making a conscious choice for one side or the other in the cosmic war between good and evil (represented by Bahamut and Tiamat, respectively). Most dragonshell are good, but those who side with Tiamat can be terrible villains.

Dragonshells are taller and heavier than humans, standing well over 6 feet tall and averaging almost 400 pounds. Your size is Medium.

Your base walking speed is 25 feet.You have a swim speed of 30 feet

You can breathe both air and water.

Due to your large shell you are ill suited to wearing armor.Your shell and scales provides natural and strong armor giving you an Armor Class of 17 (your dexterity modifier does not affect this number).You do not gain any benefits of wearing armor but if you are using a shield, you can apply the shield bonus as usual. 

You can use your action to exhale a jet of scalding steam that lingers for 3 rounds of combat. The DC for this saving throw equals 8 + your Constitution modifier + your proficiency bonus. A creature takes 1d6 fire damage on a failed save, and half as much damage on a successful one. The damage increases to 2d6 at 6th level, 3d6 at 11th level, and 4d6 at 16th level. After you use your breath weapon, you can’t use it again until you complete a short or long rest.

You have resistant to cold damage.

You can speak, read, and write Common, Aquan and Draconic. Draconic is thought to be one of the oldest languages and is often used in the study of magic. The language sounds harsh to most other creatures and includes numerous hard consonants and sibilants.