A pair of tattered, ethereal wings materialize on your back and beat the air vigorously, creating strong pulses of air. Each creature within 10 feet of you must succeed on a Strength saving throw or take 3d6 bludgeoning damage and be knocked prone. After you cast this spell, you can immediately fly 20 feet in a direction of your choice without provoking opportunity attacks.

At Higher Levels: When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d6 for each slot level above 1st.