Final Judgment The Final Judgment is a unique weapon in " Fallout 4 " . Characteristics . Final Judgment is a unique Gatling laser that bears the " rapid " legendary effect . It is the personal weapon of Arthur Maxson who carries it into battle during the quests Airship Down , Rockets ' Red Glare , Ad Victoriam and The Nuclear Option for the Brotherhood of Steel . Due to the way the game calculates bonus percentages , the Rapid affix massively boosts the damage output of a Gatling laser outfitted with the charging barrels mod . Instead of increasing the 25 % rate of fire that is left of the standard value by another 25 % , resulting in 31 . 25 % , the affix simply adds the two values for a result of 50 % of the regular rate of fire and a 100 % increase in damage output . This , combined with the quadrupled per - shot damage the charging barrels provide , makes Final Judgement one of the most powerful weapons in the game as it deals extremely high energy damage with a still very decent rate of fire , has remarkable accuracy and the most cost - efficient ammunition type of any weapon in the Commonwealth . It shoots fast enough for effective crowd control , yet packs more than enough punch to easily shred through even the most heavily armored targets as well . Final Judgment upgraded with charging barrels is arguably the most well - rounded weapon for player characters who specialize in heavy weapons can acquire as it has only two weaknesses - its high weight and the few moments its barrels need to spin up to firing speed , a trait which makes it slightly handicapped in close quarters combat . Locations . It is carried by Arthur Maxson during the quest Airship Down . Maxson will appear with a full set of T - 60f power armor and the weapon aboard a Vertibird while the Institute synths are trying to hack Liberty Prime . There is a small possibility to recover this weapon after the Prydwen is destroyed but it may glitch under the wreckage of the airship . If this happens , try the command to access Maxson ' s inventory without finding his body . If one is currently siding with the Minutemen and wants to obtain this weapon without siding with the Brotherhood of Steel , just continue the Railroad quests until receiving the quest Precipice of War , but do not go to Police Station . Instead go to the Prydwen , and kill Elder Maxson in order to retrieve Final Judgment . Alternately , one can still acquire the weapon after completing Precipice of War by continuing with Rockets ' Red Glare ; engage the Brotherhood of Steel members in the main deck area , plant the explosives , and then the player character should get ambushed by Maxson and two unnamed Brotherhood of Steel members ( one will have power armor and a Gatling laser ) as the player character exits the Prydwen via the command deck . They ' ll open fire as soon as loading completes , there ' s very little cover available and the energy weapons can deplete one ' s health very quickly . Maxson also uses it during The Nuclear Option . This can only be acquired by attacking Maxson with a weapon that has a chance to disarm . One then needs to quickly pick Final Judgement up and bring it somewhere where no one can see . This action may turn Elder Maxson hostile , however .