Blasted Smite

The next time you hit a creature with a melee weapon attack during the spell’s duration, your weapon flares with crackling, blue energy that lances out toward the hit creature, forming a sustained arc of lightning between your weapon and the target. On a hit, the target takes an extra 2d6 lightning damage, and on each of your turns for one minute, you can use your action to deal 2d6 lightning damage to the target automatically. The spell ends if you use your action to do anything else. The spell also ends if the target is ever more than 30 ft from you or if it has total cover from you.

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