Lightning Javelin

Damage: 1d6 Piercing
Range: 30/120 Charges: 1 per day
When thrown with magic 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. Target takes full damage.