Thundering voice

The magic amplifies your scream that become unbearably loud, each creature in a 30-foot cone must make a constitution saving throw, taking 4d8 thunder damage, or half as much on a success. Large or smaller creatures that fail the saving throw are pushed 15-feet away and knocked prone

Medium or smaller objects within the cone, if not wielded or being carried, are also pushed 15-feet away from you. 

𝘼𝙩 𝙝𝙞𝙜𝙝𝙚𝙧 𝙡𝙚𝙫𝙚𝙡: when cast with a 4th or higher spellslot, the damage is increased by 1d8 for each level above 3rd; when  cast with a 6th level spellslot or higher creatures no matter what size that fail the save are pushed 15 feet and knocked prone