Powerful Tail

Prerequisite: Serpent's Tail

• You have honed your skill when it comes to using your tail in
  combat. You gain the following benefits:
• Increase your Strength or Constitution score by 1, to a
  maximum of 20.
• After you take the Attack or Dash action, you can attempt
  to grapple an adjacent creature with your tail. When you
  have a creature grappled with your tail, you may attempt to
  restrain them by making another grapple attempt. If you
  succeed, they become restrained, and take 1d6
  bludgeoning damage at the start of each of their turns.