Piskan

I think about the fish’s lungs, full of water. Is not the sea contained within the fish, too?
-Annie Fisher, The Greater Picture

Piskans are small, humanoid fish spirits that are common throughout Southreach. They are squat, hardy creatures known for their toughness and adaptability—which is probably why they've integrated so well into human society. They are said to represent perseverance and strength in the face of adversity.

General Features

Age. Piskans typically follow human aging conventions.
Size. Piskans are typically small and stout, averaging between 3 and 4 feet. Your size is small.
Speed. Your base walking speed is 25ft, and you have a swimming speed of 25ft.
Amphibious. You can breathe air and water.
Darkvision. You have superior vision in dark and dim conditions. 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 can’t discern color in darkness, only shades of gray.
Relentless Endurance. When you are reduced to 0 hit points but not killed outright, you can drop to 1 hit point instead. You can’t use this feature again until you finish a long rest.
Trance. You don’t need to sleep. Instead, you meditate deeply, remaining semiconscious, for 4 hours a day. While meditating, you can dream after a fashion; such dreams are actually mental exercises that have become reflexive through years of practice. After resting in this way, you gain the same benefit that a human does from 8 hours of sleep.