Tasha's Caustic Brew - Thunder Transmuted

Tasha's Clamorous Blast 

A stream of sound emanates from you in a line 30 feet long and 5 feet wide in a direction you choose. Each creature in the line must succeed on a Dexterity saving throw or be pushed back 10ft. If a creature is knocked into another they both take 1d6 bludgeoning damage, and the pushed creature stops its movement. This damage does not stack. The creatures affected are incapacitated (as the condition), and must spend its movement standing still and steadying itself or fall prone. If they choose to move, they will fall prone after the movement has ended. After falling prone or steadying itself the effect then ends on the creature, whether the spell has finished or not. 

A concentration fail on this spell removes the incapacitated condition and the need to fall prone immediately

The concussive blast from this spell can be heard 300ft away in the direction of the spells travel. This decreases in other directions and to the left and right of the line it can be heard 100ft away, and behind the caster, only 20ft.

Usage of this spell consumes one sorcery point

At Higher Levels. A side-effect of spell transmutation is that spells cannot be cast at higher levels