Agile Swimmer

You flip, twist, and turn in the water with grace.
• Increase your Dexterity score by 1, to a maximum of 20.
• You gain a swim speed equal to your walking speed. If you already have a swim speed, or if you are at least level 10, your swim speed increases by 10 feet.
• You may hold your breath twice as long before suffocating, and if you start suffocating, you can survive for an additional 2 rounds before dropping to 0 hit points.