Arcane Recoil

You cause the spell that triggered this spell’s casting to blow up in the caster’s face. The creature that triggered this spell must make a Constitution saving throw. On a failed save, it takes 3d8 force damage. On a successful save, it takes half damage.

If this damage causes the creature to lose concentration on the spell it just cast, the spell fails entirely before it can have any effect.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, it deals an additional 1d8 force damage for each spell slot above 4th.