Arcing Javelin

You raise your hand and a bolt of lightning forms in grasp, then throw it a  target within 30 feet or up to 60 feet with disadvantage. Make a ranged spell attack against the target. On a hit, the target takes 2d6 lightning damage. Hit or miss, the bolt then jolts through the target. Then each creature in a 10 foot line behind the target must succeed on a Dexterity saving throw or take 2d4 for the first 5 feet, and 1d4 for the second 5 feet.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the lightning damage increases by 1d6 for the primary target and 1d4 for each secondary target, for each slot level above 1st.

Example:

Caster----bolt---->| Target | 5 Feet | 5 Feet |

Caster----bolt---->|   2D6   |   2D4   |  1D4    |