Bastet

This javelin is a special weapon, kept by a once great barbarian who was sent insane and imbued his power into it before his death.

This weapon has 7 charges. 

Upon expending one charge, you can hurl it and speak its command word. It will transform 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 16 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 damage from the javelin plus 4d6 lightning damage.

Upon speaking its command word again, the javelin will be called back to your hand, and regains 1d6+1 charges upon each dawn.

This weapon cannot be destroyed, as it carries the indomitable will of a barbarian.

Proficiency with a Javelin allows you to add your proficiency bonus to the attack roll for any attack you make with it.

Notes: Damage: Lightning, barbarian, Damage, Combat, Thrown, Slow