Your Strength score increases by 2, and your Wisdom score increases by 1.

You can live forever. As long as someone can help you break open your old carapace. Funnily enough, you will die after any intercourse (except self-abuse). No one knows why, but it explains why you don't often see Crab people Bards.

Your size is Medium.

Your base walking speed is 30 feet, and you have swimming speed of 30 feet.

Your claws are natural weapons, which you can use to make unarmed strikes. If you hit with them, you deal slashing damage equal to 1d4 + your Strength modifier, instead of the bludgeoning damage normal for an unarmed strike.

You can breathe air and water.

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.

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