Tritons

Centuries ago, tritons entered the world in response to the growing threat of evil elementals. Tritons waged many wars against their enemies on the Plane of Water, driving them into the Darkened Depths where they escaped into the crushing pressure and utter darkness.
In time, the tritons noticed that their ancient elemental foes had grown quiet. Expeditions to the depths revealed that Kraken, Sahuagin, and far worse foes had fled the Plane of Water for the Material Plane.
The tritons, driven by a sense of duty and responsibility, would not allow their foes to escape so easily. A great conclave of tritons chose volunteers skilled in weapons and magic as part of an expeditionary force to enter the Material Plane and seek out their enemies.
Those tritons spread across the world's oceans and established protectorates to watch over deep sea trenches, portals, undersea caves, and other locations where their enemies might lurk. They defeated their foes when they found them and drove the rest into hiding .
Given their isolation, most tritons have never been to the surface world. They struggle with the idea that they can't easily move up and down out of water, and the changing of the seasons mystifies them.

Tritons around the Azure Sea

Tritons guard the ocean depths, building small settlements beside deep trenches, portals to the elemental planes, and other dangerous spots far from the eyes of land-bound folk. Long-established guardians of the deep ocean floor, in recent years the noble tritons have become increasingly active in the world above.
As a result of their isolation and limited understanding of the Material Plane, tritons can come across as haughty and arrogant. They see themselves as caretakers of the sea, and they expect other creatures to pay them deep respect, if not complete deference.
Tritons hold council in their secret underwater stronghold of Jolbel Deep, at the edge of the Shimmering Abyss which lies deep within The Azure Sea.

Triton by Unknown

Triton

Ability Score Increase +1 Str, +1 Con, +1 Cha

Size Medium

Speed 30 ft., swim 30 ft.

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Amphibious. You can breathe air and water.
Control Air and Water. 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.
Emissary of the Sea. 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.
Guardians of the Depths. 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.
Languages. You can speak, read, and write Common and Primordial.