Javelin of Lightning

When you hurl this javelin, it transforms into a
bolt of lightning, forming a line 5 feet wide that
extends out from you to a target within 120 feet.
Each creature in the line excluding you and the
target must make a DC 14 Dexterity saving
throw, taking 4d6 lightning damage on a failed
save, and half as much damage on a successful
one. The lightning bolt turns back into a javelin
when it hits. Make a ranged weapon attack
against the target. On a hit, the target takes
damage from the ja