Discordant Malediction

One creature you can see within range must make a Wisdom saving throw. On a failed save, the targets voice rends the air around them. Each time the target casts a spell with a verbal component, they and all creatures within 10 feet of them immediately take 2d6 thunder damage. The target must then make a Concentration saving throw against the damage taken. On a failed save, the target's spell fails and the casting is lost.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the damage dealt increases by 1d6 for each slot level above 5th.

Creation Course: "Eldritch Expansion" homebrew by Toby Lowther on GMBinder.com