When you hurl it and speak its Command Word, 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 13 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 reaches the target. Make a ranged weapon Attack against the target. On a hit, the target takes 1d6 piercing plus 4d6 lightning damage.
The javelin's property can't be used again until the next dawn.
Inactive
Roll to hit target - 1d6+STR Piercing
Active
120 feet line - DC 13 Dex Save - 4d6 Lightning
Roll to hit target - 1d6+STR Piercing + 4d6 Lightning