Final Judgment

The Final Judgment is a unique weapon (Gatling laser) in Fallout 4 it is carried by Arthur Maxson during the quest Airship Down.

Characteristics
Functions relatively the same as a standard Gatling Laser albeit with bonus 25% faster fire rate, 15% faster reload. It uses Fusion cores as ammo.

When attached with Overcharging Barrels, it's rate of fire is doubled instead.

Locations
It is carried by Arthur Maxson during the quest Airship Down.

If you are currently siding with the Minutemen and you want to obtain this weapon without siding with the Brotherhood of Steel, just continue the Railroad quests until you receive the quest Precipice of War, but do not go to Police Station. Instead go to the Prydwen, and kill Elder Maxson in order to receive Final Judgment.

Bugs
It is unconfirmed at this point, but some players have reported that their Final Judgement never uses up Fusion Cores. It is unclear if this is a bug or a hidden effect of the weapon.