You elongate your tail and learn to manipulate its mass to more easily knock foes off balance. You gain the following benefits:

• Your unarmed strike with your tail has a reach of 10 feet.

• As an action, you can sweep a 10-foot semicircle with your tail. Make a single attack roll for an unarmed strike with your tail against each creature in the area.

• When you use a bonus action to successfully shove a creature with your tail, you regain your bonus action.

Sandy Petersen’s Cthulhu Mythos