Nereids are associated with the stormy seas and oceans. They look like beautiful humans but with pearlescent blue-green skin, luminous eyes, and webbed hands and feet. Nereids have no trouble adapting to civilization, but they are a rare sight, because they vastly prefer the ocean to walking on dry land.
Nereid Ancestry.
You can breathe underwater, and
you have a swimming speed of 40 ft. Starting at 3rd
level, you may cast the fog cloud spell once with this trait
and regain the ability to do so after a short or long rest.
Starting at 7th level, you can cast the water walk spell
once with this trait and regain the ability to do so after a
short or long rest. Charisma is your spellcasting ability
for these spells.