race features:
Child of the Sea
You can breathe air and water, and you have resistance to cold damage.
Darkvision
You can see in dim light within 120 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.
Friend of the Sea
Aquatic animals have an extraordinary affinity with your people. You can communicate simple ideas to any Beast that has a swimming speed. It can understand your words, though you have no special ability to understand it in return.
Although they were of the same subrace, aquatic elves vary very different appearance wise depending on their place of origin. Some have deep green skin, mottled and striped with brown. Others have blue skin with white stripes and patches. Some other aquatic elves had pale silver-green skin. All groups are robust and tall with long limbs. Their thick skin gave them protection from the cold of deep water, keeping them comfortable at just above freezing temperatures. Their fingers and toes are generally about twice as long as a human's and had thick webbing between them. Their most distinctive feature was the gills visible in their necks and over their ribs. Compared to other elves, aquatic elves had deep voices and were larger and heavier.
Aquatic elves could have eye colors including turquoise, white, black, blue, green, and rarely silver. Their hair was usually thick and somewhat stringy, and some aquatic elves had a rough hair texture. It could be blue-green, emerald green, blue, black, silver, or even occasionally red. Warriors clipped their hair short, but other aquatic elves wore it long and flowing. Females in particular sometimes grew their hair up to 4 feet long.