I mean we don't know much But I was hoping for something along the lines of Shifting like werewolves.
High Tide, when the Ocean's strength is at it's greatest, the merfolk are also at their strongest, even have the power to walk on land. but only during high tide.
When Low tide, comes, merfolk have to return to the ocean, otherwise they'll shift and be stranded on dry land... either be carried back to shore, worm their way back to shore, or perish from lack of water.
Hopefully there is an adventure aspect in terms of exploring the Sea, and finding sunken treasure. I hope to find an under water grotto/temple ruins. sort of like a "sword in the stone" aspect, Poseidon's Trident. Pull it out and gain all the powers of the ocean.
Summon storms, attack the shores with Massive tidal waves, aquatic transformations.
I'm Blanking on Mermaid Perks tho...
Maybe:
Alluring Aura, Allowing Your presence alone will inspire certain things to happen
Voice of the Sea, to calm, call storms, mind manipulation.
Aquatic Guardian, summon a Guardian/companion (of choice).
