Ariella's Blessing (Merfolk-only Feat)

The goddess of the sea blesses you with divine water that shields and sustains you. You gain the following benefits.

Ability Score Increase. Increase your Constitution score by 1, to a maximum of 20.

Water Veil. Once per long rest, you can use an action to surround your body with a veil of water that hovers 1 inch from your skin and scales for 1 minute. While the veil persists, you have resistance to fire damage but vulnerability to lightning damage. In addition, using this feature sustains your body for the day, preventing you from suffering exhaustion from your Water Dependency trait at the end of that day.

Aqua Ring. While your Water Veil is active, at the start of each of your turns you gain temporary hit points equal to your proficiency bonus + your Constitution modifier (minimum of 1). These temporary hit points replace any temporary hit points you already have.