Caustic Chains

You shackle the target hit by your attack with acidic chains. The target takes 2d4 acid damage and must make a Strength saving throw. On a failed save, it is restrained and it takes an additional 2d4 damage at the beginning of each of its turns. It may repeat this saving throw at the end of each of its turns, ending the effect on a success.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 2d4 for each slot level above 3rd.