Drowning Strike

The next time you hit a creature with a melee weapon attack, the attack deals an extra 3d6 acid damage as water forms in the target's lungs. The target must make a Constitution saving throw. On a failed save, it has disadvantage on attack rolls and ability checks, and can’t take reactions, until the end of its next turn.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d6 for each slot level above 2nd.