Your Strength score increases by 3, and your Wisdom score increases by 2.

Your base walking speed is 30 feet. your powerful arms and legs give you a swim speed of 40ft.

Your claws are natural weapons, which you can use to make unarmed strikes. If you hit with them, you deal slashing damage equal to 1d6 + your Strength modifier, instead of the bludgeoning damage normal for an unarmed strike.

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.

You can withdraw into your shell as an action. Until you emerge, you gain a +4 bonus to AC, and you have advantage on Strength and Constitution saving throws. While in your shell, you are prone, your speed is 0 and can't increase, you have disadvantage on Dexterity saving throws, you can't take reactions, and the only action you can take is a bonus action to emerge from your shell.

You gain proficiency in the Survival skill. Tortles have finely honed survival instincts.

You can speak, read, and write Common and Aquan.

your ancestors have the power of steam breath and so do you. You can use your action to exhale destructive energy. It deals damage in an area according to your ancestry (15' cone). When you use your breath weapon, all creatures in the area must make a saving throw, the type of which is determined by your ancestry (con). The DC of this saving throw is 8 + your Constitution modifier + your proficiency bonus. A creature takes 2d8 damage on a failed save, and half as much damage on a successful one. The damage increase to 3d8 at 6th level, 4d8 at 11th, and 5d8 at 16th level. After using your breath weapon, you cannot use it again until you complete a short or long rest.