Elemental Strike

The next time you hit a creature with a melee weapon attack during the spell’s duration, your weapon glows a dim color that matches the chosen element, and the attack deals an extra 2d6 elemental damage of your choice: lightning, fire, cold, or acid. At the start of each of its turns until the spell ends, the target must make a Constitution saving throw. On a failed save, it takes 2d6 damage of the same type. On a successful save, the spell ends.

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