Javelin of Lightning

When you throw this weapon at a target no farther than 120 feet from you, you can forgo making a ranged attack roll and instead turn the weapon into a bolt of lightning. This bolt forms a 5-foot-wide Line [Area Of Effect] between you and the target. The target and each other creature in the Line [Area Of Effect] (excluding you) makes a DC 13 Dexterity saving throw, taking 4d6 Lightning damage on a failed save or half as much damage on a successful one. Immediately after dealing this damage, the weapon reappears in your hand. This property can't be used again until the next dawn.