Unrelenting Force

You create 30 foot wide, 10 foot tall, 50 foot long blast of pure force which sends your enemies flying back with the power of your voice. All creatures in the line of fire must succeed on a DC 17 dex saving throw or be blasted 50 feet back and 30 feet into the air. Can only be used every 3rd player turn.

Most creatures can't physically pass through the blast of force. It is immune to all damage and can't be dispelled by magic.

Damage: 3d8 of force damage.

When casting at higher levels, 1d8 is added to the damage.