Prehensile Tail

You can use your tail to grab small, stowed objects carried on or near your person and for fine manipulations such as lockpicking or tying knots.
While you cannot wield weapons with your tail, having a prehensile tail also adds Advantage on all Acrobatics and Athletics checks. 
You can use your tail to grapple with an enemy 
You can use your tail for sneak attacks, using the action to grab, trip, or hit an enemy.
You can use your tail as bonus action after using Unarmed Strike, using  your tail as whip.