Unbroken Air

You can create a blast of compressed air that strikes like a mighty fist. As an action, you can spend 2 ki points and choose a creature within 30 feet of you. That creature must make a Strength saving throw. On a failed save, the creature takes dice:3d10|noform|noparens|avg (3d10) bludgeoning damage, plus an extra dice:1d10|noform|noparens|avg (1d10) bludgeoning damage for each additional ki point you spend, and you can push the creature up to 20 feet away from you and knock it prone. On a successful save, the creature takes half as much damage, and you don’t push it or knock it prone.

Sources

Player’s Handbook p. 81