Conduct Lightning

You cast a jolt of lightning from your fingertips towards an area of metal, the area (maximum of a 10ft square) becomes electrically charged and any creature who makes contact with the metal takes 2d8 lightning damage and has to make a Constitution saving throw. On a failed save, the creature cannot take reactions for one round and its movement speed becomes 0. Any creature still in contact with the area at the beginning of their turn takes 1d10 lightning damage.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the initial damage increases by 1d8 for each slot level above 2nd and the continued damage increases by 1d10.