Weapons

A unique weapon in Fallout 4 is an ordinary weapon with one sentence attached, and that sentence is the whole product. The Gatling Laser you can build yourself is the same gun as Final Judgment; what you are actually acquiring is a 25 percent fire rate increase. Read the list that way and the ten weapons in our unique weapons guide stop being ten guns and become four kinds of solution to four different problems.

This guide sorts them by what the effect does for a build rather than by the weapon class, and then covers the thing the list does not say out loud, which is that two of the ten cannot exist in the same save.

Effects that solve a resource problem

The strongest effects in the game are not damage numbers, they are the ones that stop something running out. The Wazer Wifle sits at the top of our ranking for exactly this reason: it has an unlimited magazine, so it never reloads as long as you are carrying ammunition for it, on top of more than double the base damage. It is the reward for three unmarked quests for Shaun after the main story.

Kellogg's Pistol does the same trick with Action Points instead of ammunition, generating AP on every critical hit, which turns V.A.T.S. from a resource you spend into one that partly refills itself. It comes off Kellogg's body during the main quest Reunions, which means almost everyone already has it and most people never notice what it does.

Effects that multiply criticals

The second group is built for V.A.T.S. characters and stacks with the Luck-heavy spreads in our builds guide. Righteous Authority doubles critical damage and refills the critical meter 15 percent faster, which is two effects for the price of one, and Paladin Danse hands it over for finishing Call to Arms early in the Brotherhood questline. Final Judgment's +25 percent fire rate and +15 percent reload speed do the same job through volume rather than multipliers.

Effects with a condition attached

Three weapons pay out enormously but only in a specific situation, which makes them build choices rather than upgrades. The Sentinel's Plasmacaster deals double damage to targets at full health, so it rewards opening a fight rather than finishing one, and it is the natural sniper's weapon on this list. The Last Minute's +50 percent limb damage only exists if you are targeting limbs, which means V.A.T.S. again. The Furious Power Fist climbs 15 percent per consecutive hit on the same target, so it is worthless against a crowd and devastating against a single large enemy.

Read together, those three are a reasonable summary of Fallout 4's combat: pick whether you are an opener, a crippler or a grinder, and the game has a named weapon waiting for that answer.

Effects that buy you room

The last group does not increase your damage at all. Lorenzo's Artifact is a radiation pistol that knocks enemies backward on every successful shot, which is a way of holding a boss at arm's length while something else kills it. The Institute Beacon is a grenade that spawns a couple of Synths where it lands; they are not strong, and that is not the point, because what you are buying is somewhere else for the room to be looking.

The Big Boy is the outlier, an upgraded Fat Man firing two projectiles at once for roughly double the damage, at the cost of +150 percent spread and +100 recoil. It is the only weapon here whose downside is as large as its upside, and Arturo in Diamond City will sell you one.

The two you cannot both have

The list quietly contains a contradiction, and it is worth spelling out before anyone plans a collection run. The Sentinel's Plasmacaster is bought from Proctor Teagan after finishing A New Dawn, the last quest in the Brotherhood questline. Final Judgment is looted from Elder Maxson's corpse during Airship Down, Precipice of War or Rockets' Red Glare, which are the Institute and Railroad quests that destroy the Brotherhood.

One requires the Brotherhood to win and the other requires Maxson to die. No single playthrough can produce both, which makes this bucket the clearest illustration of the point the quests guide is built on: allegiance is the only thing in the Commonwealth you genuinely cannot have twice.

The same logic applies more loosely across the whole list. Three of the ten are faction rewards, one is Institute-issued, and one depends on siding with Lorenzo in a side quest. If you want a specific weapon, check which faction it belongs to before you commit, and check the armor guide too, since Honor and Vengeance are gated on Brotherhood rank in exactly the same way.