Skulk of the Sea-Ninja_Prawn as a Rogue Subclass

[JNAProductions]

Speed of the Prawn-Starting at 3rd level, gain a swim speed equal to your land speed. In addition, you can always take the Hide action if you are in a body of water and your opponents are not. Finally, you can hold your breath for 10 times as long as usual.

Diving Strike-At 9th level, you gain advantage on any melee attacks made during the same turn you dive into a body of water or breach the surface. This bonus cannot be gained by exiting and re-entering a body of water.

Seaborn-By 13th level, you are truly one of the sea. You may now breathe underwater, and your swimming speed increases by 10'. In addition, saltwater invigorates you-if you can soak in salt water or rest in a body of salt water during a short rest, you regain twice the normal amount of HP from hit dice.

Shrimp Claws-At 13th level, you gain crustacean-like claws in a second set of limbs on your chest. These are light, finesse weapons that you are proficient in and deal 1d8 piercing damage.

Seaking-Alternatively, Seaqueen or Searuler. You are a master of the ocean and can bring it with you. Once per long rest, starting at level 17, you may cast Tsunami. In addition, your swim speed increase by 10' again. Finally, you may, once per short rest, create a body of water totaling no more than 10,000 cubic feet, enough to fill a 50' by 50' room to a depth of 4'. This body of water quickly evaporates, and is gone within an hour.