Thunderbolt

You hurl a bolt of lightning you can see within range. Make a ranged spell attack against the target. On a hit, the target suffers 1d10 lightning damage.
Additionally, the lightning will arc to a nearby creature of your choice within 5 feet of the initial target. You must make a separate spell attack roll for each additional target.

The lightning can arc to one additional target at 5th level, 11th level, and 17th level. A single creature can only be damaged once with this spell.