Swimmer

You are a great swimmer, you gain the following benefits-

• Increase your strength or dexterity by 1, to a maximum of 20
• When you are prone underwater, you can roll a DC 15 acrobatics check to re-orient yourself, nullifying the prone condition, or, if you fail said roll, re-orienting yourself costs only 10ft instead of half your movement
• Your swimming speed is equal to your walking speed, if it wasn't already higher
• Strength (Athletics) checks made underwater are at advantage