Ceraunic Orb

You conjure a electric orb in your free hand. The orb is a 10 diameter that sheds bright light in a 20-foot radius and dim light for an additional 20 feet, and it lasts for the duration. Make a melee spell attack against the target. On a hit, the target takes 1d8 lightning damage, and it take an additional 1d8 thunder damage at start of their next turn.

At Higher Levels.  When you cast this spell using a spell slot of 3rd level or higher, the lightning and thunder damages increase by 1d8 and the number of attacks increases by one for every two slot levels above 2nd.