Sahuagin -
The sahuagin are an ancient species spawned in the ocean depths. With their armored skin and fearsome demeanor, they have long inspired terror in the people of the surface world. They are natural predators with aggressive instincts, kin to the shark and often devotees of the Devourer. But there is nothing innately evil about most sahuagin; in the depths of the Thunder Sea, sahuagin champions battle fiends and aberrations.
Sahuagin are amphibious humanoids with leathery skin, sharp teeth, and webbed hands and feet. They have finlike crests on their heads, which extend and retract in response to their mood. While the majority of sahuagin have gray-green scales, others have scales with dramatic, colorful patterns.
Size: Medium (about 5–7 feet tall)
Speed: 30 feet
Creature Type: Humanoid
Sahuagin Traits
Darkvision
You have Darkvision with a range of 120 feet.
Swift Swimmer
You have a Swim speed equal to your Speed.
Blood Frenzy
As a Bonus Action, you can enter a blood frenzy for 1 minute. During this time, you have Advantage on attack rolls against any creature that doesn't have all its Hit Points.
You can use this Bonus Action a number of times equal to your Proficiency Bonus, and you regain all expended uses when you finish a Long Rest.
Natural Armor
You have tough, scaly skin. When you aren't wearing any armor, your base Armor Class equals 12 plus your Dexterity modifier. You can use a Shield and still gain this benefit.
Limited Amphibiousness
You can breathe air and underwater, but you need to be submerged at least once every 4 hours to avoid suffocating.