race features:
Sea Legs: You have Advantage on Strength (Athletic) & Dexterity (Acrobatic) checks related to sailing.
Weather Bones: You can sense the impending weather change in the air, up to 24 hours in advance.
Storm Versatility: Any spell you cast that deals Lightning damage you can change to Thunder damage and vice versa.
Magic of the Ocean: The Arcane Attunement racial feature is extended to 200 ft while on water & up casting is no longer is limited to an area but a vessel.
"Wide eared but pointy eared and olive green these Elves took to the sea long ago to live a more liberated life among the Free Isles. They typically have a wanderlust in their hearts that drives them forward to new places. Though they do have a tendency to return often to their favorite places. Over the centuries they have learned how to leave on the numerous islands but also how make their bodies feel the ebbs and flows of magic more fully."