No matter where you go, people are afraid of you due to your reputation. When you are in a civilized settlement, you can get away with minor criminal offenses, such as refusing to pay for food at a tavern or breaking down doors at a local shop, since most people will not report your activity to the authorities.
Starting at 1st level, your existence in a twilight state between life and death makes you difficult to defeat. When damage reduces you to 0 hit points, you can make a Charisma saving throw (DC 5 + the damage taken). On a success, you instead drop to 1 hit point. You can't use this feature if you are reduced to 0 hit points by radiant damage or by a critical hit.
After the saving throw succeeds, you can't use this feature again until you finish a long rest.
Adapted to even the most extreme ocean depths, you have resistance to cold damage, and you ignore any of the drawbacks caused by a deep, underwater environment.
Aquatic beasts have an extraordinary affinity with your people. You can communicate simple ideas with beasts that can breathe water. They can understand the meaning of your words, though you have no special ability to understand them in return.
A child of the sea, you can call on the magic of elemental air and water. You can cast Fog Cloud with this trait. Starting at 3rd level, you can cast Gust of Wind with it, and starting at 5th level, you can also cast Wall of Water with it. Once you cast a spell with this trait, you can't do so again until you finish a long rest. Charisma is your spellcasting ability for these spells.