Tail Lash

You learn to use your tail in combat in effective ways. You gain the following benefits. 

• Increase your Strength or Dexterity score by 1.
• Once per turn, you can take the Attack action and make an unarmed strike with your tail that does an additional [roll]1d4[/roll] bludgeoning damage on a hit.
• When you hit a creature with your tail, you can force them to make a Strength saving throw. On a failed save, they are knocked prone (if you used Dexterity for the attack) or knocked back 10 feet (if you used Strength for the attack). The DC is 8 + your proficiency + the modifier you used to hit. 
• You can use your tail as a reaction to avoid being knocked prone.