Triton

Races that are not Large nor have an innate flying speed gain an extra Feat of their choice. This Feat must be a "Full Feat".

Your character can speak, read, and write Common and one other language that you and your DM agree is appropriate for the character. 

You gain 3 ability points to increase any abilities of your choice. You can't increase a single ability by more than 2 with these points.

You can breathe air and water. 

You can cast fog cloud with this trait. Starting at 3rd level, you can cast the gust of wind spell with this trait. Starting at 5th level, you can also cast the water walk spell with it. Once you cast any of these spells with this trait, you can’t cast that spell with it again until you finish a long rest.

You use your Spell Save DC or Mastery Save DC (your choice) for these spells. If you have a class feature that allows you to learn spells, you count these spells as known by that class. You always have them learned or prepared, and they don’t count against the number of spells you can learn or prepare.

You can see in dim light within 60 feet of you as if it were bright light and in darkness as if it were dim light. You discern colors in that darkness only as shades of gray. 

You can communicate simple ideas to any Beast, Elemental, or Monstrosity that has a swimming speed. It can understand your words, though you have no special ability to understand it in return. 

Adapted to the frigid ocean depths, you have resistance to cold damage.