Aquatic

You are exceptionally speedy and agile. You gain the following benefits:

• Your swimming speed increases by 10 feet.
• You can now hold your breath for up to an hour.
• You gain advantage on stealth checks while underwater.
• You can deal an extra 1d8 damage to one creature you hit with an attack if you have advantage on the attack roll. You don’t need advantage on the attack roll if another enemy of the target is within 5 ft. of it, that enemy isn’t incapacitated, you're submerged in the water, and you don’t have disadvantage on the attack roll. You must be in the water to use this ability.  Once you use this ability, you cannot use it again until you finish a short or long rest.