The Thunderbolt of Zeus

Simple weapon (Javelin), very rare

This crackling three foot long lightning bolt booms with energy every few seconds. It is nigh impossible to hide while carrying this bolt. Stealth is not the way of the storm.

Unerring

This weapon has a +1 bonus to hit and damage.

Lightning

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 damage from the javelin plus 4d6 lightning damage. This effect can be used once and recharges daily at dawn.

Thunderous Strike

When throwing this weapon you can choose to vanish with a spark into it, reappearing with the javelin within 5 feet of the target, holding the Javelin. Doing this deals 4d6 thunder damage to everyone (including you) within 20 feet of where you are appearing (DC13 Constitution saving throw for half).