you get an ability score of your choice increase by 2 and another by 1

due to your fey ancestry, you have a natural connection to magic and you gain access to one cantrip of your choice

you have a high swim speed due to your connection to the sea

You can breathe in both air and water, due to your connection to the sea

You can speak, read, and write common and one other language of your choice. You can also speak with axolotls, as if always under the talk to animals spell

you have dark vision, due to your ancestry in the dark of the sea. you gain a 90ft darkvision, and you can discern colors

you have tremor sense up to a range of 30ft, BUT ONLY IN WATER.