All-Out Push

As an action, you compile a forceful energy that you can unleash in a 60-foot line that is 10 feet wide. Creatures in that line must make a Dexterity saving throw, taking 4d8 + your spellcasting ability modifier force damage and be pushed back 15 feet and knocked prone on a failed save, or take half as much damage and not be knocked prone on a success. You can cast this spell only if you haven’t moved during this turn, and after you cast this spell, your speed is 0 until the end of the current turn.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the base damage increases by 1d8 for each slot level above 3rd.