Your Wisdom score increases by 2 and your Constitution score increases by 1. 

Your swimming speed is 35 feet. 

Your ties to the feywild are still fresh and strong: You have expertise on saving throws against being charmed, and magic can't put you to sleep.

Twice per long rest, you can take the form of a seal. When transform, your swimming speed increases by 15 feet while your walking speed decreases by 15. You gain AC 15 (natural armor) and can use your teeth to deal piercing damage equal to 2d6 + your strength modifier. When transformed, you have advantage on attack and damage rolls when fighting underwater, and can hold your breath for 25 (+ Constitution modifier) minutes, after which you have to emerge and draw breath or succeed on a DC 13 constitution saving throw to stay submerged for another minute. 

You can stay in your seal form as long as you wish, as long as you do not stay away from a body of water for more than 1 hour. If you stay away from a body of water for 1 hour, you transform back into your humanoid form automatically and have to expend another use of this ability to transform back into a seal. 

You can speak Common and Aquan. 

Selkies reach maturity in their early twenties and can live for 200 years. 

Selkies are about as tall as a human, and while they gain in weight when transforming, their size does not grow considerably. Your size is medium.

Selkies are gentle and curious creatures, with little preference towards chaos or order. Their normally peaceful nature lets them tend towards good alignments, and evil selkies are rare.