Landwalker

You have mastered a form of magic that lets you transmute your tail into a pair of legs. You gain the following benefits:

• Increase your Constitution or Charisma by 1, to a maximum of 20
• You can use a bonus action to transform your tail into a pair of legs for up to 24 hours or until you revert using a bonus action. While in this form, your base walking speed becomes 30 feet and you are not by default considered Prone while on land.
  Once you have used this feature, you cannot do so again until you have been fully submerged in water for at least 8 hours.