Full Body Tactics

To you, your body is as much part of your weaponry, as your sword or shield, you have learned to use your tail in combat, the DC for its effect is 8 + your proficiency modifier + your strength or dexterity modifier. (Your choice).

Tail swipe

On your turn, you can use a bonus action to make a tail swipe. On a hit it will do 1d4 plus your STR or DEX modifier in damage, any creature with a size up to large, must make a dexterity saving throw. On a failed save you knock the target Prone.

When a hostile creature leaves the 5 foot area around you, you can also use your reaction to make a tail swipe. This can be done even if the creature takes the disengage action. If the attack hits as part of a reaction, the targets speed is reduced to 0 until its next turn. You can do this twice per short or long rest.