Coned Blast (5e Spell)
From D&D Wiki
|Self (30 foot cone)
|V, S, M (A small bell made of brass or gold)
You ring a small bell and cause it to emit a concussive blast. Each creature in a 30-foot cone must make a Strength saving throw. A creature takes 6d6 thunder damage on a failed save and is knocked prone. On a successful save a creature takes half as much damage and is not knocked prone.
At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.