Deep One Hybrid

Though little is known of the mysterious Deep Ones, whispers in many coastal town tell of their proclivity for mating with other species. The offspring of such unions are known as Deep One Hybrids - resembling their terrestrial parents, but marked by large, dark, glassy eyes, lipless mouths, clammy skin, and visible gills. These traits become more and more apparent as they age, until they finally transform completely into Deep Ones and forsake the land entirely. Deep One Hybrids have an intense connection to the sea and rarely travel far inland; they tend to stay in the isolated coastal towns into which they're born, as their odd features and eldritch presence tend to engender unease at best and hatred at worst.

Deep One Hybrids come from H.P. Lovecraft's 1931 novella The Shadow Over Innsmouth, which you can read on Wikisource here.

Deep One Hybrid
Ability Score Increase: Your Charisma increases by 2 and your Constitution increases by 1.
Age: Deep One Hybrids age at a similar rate to their non-Deep One parent species, and usually complete their metamorphosis into Deep Ones around age 50. Once they reach this stage, the upper limits of their lifespan are unknown.
Alignment: Though all feel the influence of powerful entities like Dagon or Cthulhu, most Deep One Hybrids tend toward Neutral alignments, simply wishing to be left alone in their isolated communities. Those who embrace the service of entities like Dagon and Cthulhu tend toward Evil alignments.
Size: Most Deep Ones stand between 4 and 7 feet tall. Your size is Medium.
Speed: 30 ft.
Languages: You can speak, read, and write Common and Deep Speech.
Darkvision: 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.
Amphibious: Your swimming speed is 30 feet, and you can breathe air and water.
Shape of Water: You know the cantrip shape water. Charisma is your spellcasting ability for it.
Blasphemous Visage: You are proficient in Intimidation.
Horror of the Deep: Starting at 3rd level, you can use your action to channel the horror and madness of the otherworldly things that dwell in the ocean depths. Green light gleams from your eyes and gills, and the air around you seems to waver and shift like water.

• Your transformation lasts for 1 minute or until you end it as a bonus action. During it, the ground around you for 10 feet becomes difficult terrain, and at the end of each of your turns, you and each creature within 10 feet of you take psychic damage equal to half your level (rounded up). In addition, once on each of your turns, you can deal extra psychic damage to one target when you deal damage to it with an attack or a spell. The extra psychic damage equals your level.
• Once you use this trait, you can't use it again until you finish a long rest.

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