The experimental MIRV is a unique Fat Man that can be found in the bomb shelter area in the National Guard depot. This weapon deals the most damage of any weapon in the entire game, as it acts like a shotgun version of the Fat Man, delivering eight mini nukes at once. The MIRV actually does the same damage as a Fat Man per mini nuke, as 12,880/8 equals 1,610. This means that the MIRV is simply a Fat Man with extra capacity and increased ammunition usage. It will not fire if you don't have at least 8 mini nukes in your inventory to load it with. If you have fewer than 8 mini nukes, the weapon will reload but never discharge the payload.
The Experimental MIRV can fire a total of 63 shots, the equivalent of 504 mini-nukes, from full condition before breaking.
- Fat Man - The common variant in Fallout 3.
|Weapon name (current weapon is highlighted)||- Weapon name (melee or unarmed)||Attacks in V.A.T.S.||- Attacks in V.A.T.S.|
|Weapon name (current weapon is highlighted)||- Weapon name (gun, energy or explosive)||Action point cost||- Action point cost|
|Damage per attack (damage per projectile)||- Damage per attack (damage per projectile)||Damage per action point||- Damage per action point|
|Damage per second||- Damage per second||Weapon spread||- Weapon spread|
|Area of effect damage||- Area of effect damage||Magazine capacity (shots per reload)||- Magazine capacity (shots per reload)|
|Effect damage & duration||- Effect damage & duration||Durability (number of attacks before breaking)||- Durability (number of attacks before breaking)|
|Bonus effects||- Bonus effects||Weight||- Weight|
|Attacks per second||- Attacks per second||Value in caps||- Value in caps|
|Critical chance % multiplier||- Critical chance % multiplier||Value to weight ratio||- Value to weight ratio|
|Critical damage||- Critical damage||Skill required||- Skill required|
|Critical effect damage & duration||- Critical effect damage & duration||Strength required||- Strength required|
|With all mods attached||- With all mods attached|
|Weapon name (current weapon is highlighted)||Damage per attack (damage per projectile)||Damage per second||Area of effect damage||Bonus effects||Attacks per second||Critical Chance % multiplier||Critical damage||Action Point cost||Damage per action point||Weapon spread||Magazine capacity (shots per reload)||Durability (number of attacks before breaking)||Weight||Value in caps||Value to weight ratio|
|Fat Man||10||2542||1600||+10 radiation/12s||1.58||x0||0||65||24.8||2.0||1||167||30||1000||33.3|
The player must complete the unmarked quest Keller Family Refuge before they can gain access to the secure section of the depot housing the weapon.
It's also possible to gain entrance to the armory by using a glitch.
- The MIRV looks identical to the Fat Man, meaning only 1 mini nuke appears to be loaded on to the weapon; however the game overlaps all eight mini nukes, which separate upon exiting the weapon.
- Sometimes the MIRV (or Fat Man), is set up such that using it in V.A.T.S. will cause the player to aim directly at the enemy, without aiming upwards to compensate for the distance. This, coupled with the fact that only the 8th nuke shot out of the MIRV will go as far as the Fat Man's single nuke (and all other nukes will travel shorter distances), means that using the MIRV in V.A.T.S. will cause the player's death.
- If you look directly at the ground and fire the MIRV, the 8 mini nukes' combined power is enough to launch your dead body to the height limit (roughly the height of Tenpenny Tower).
- Similarly, the MIRV can potentially send the bodies of human enemies hit by multiple mini nukes flying hundreds of feet into the air, potentially rendering their bodies impossible (or very hard) to find. Keep this in mind before using the MIRV on an opponent whose body you want to loot.
- It costs more to fire this weapon once than it does to repair a regular Fat Man twice. At several hundred caps per nuke and firing eight nukes per shot, this is the most expensive weapon in the game, albeit the most powerful.
- Depending on your game system, its age, and the amount of excessive use of the MIRV, it may cause your system to lag and possibly crash.
- Out of every weapon in Fallout 3, the MIRV is the most powerful in terms of base damage.
- Considering everything mentioned above, the experimental MIRV is one of most inefficient, unnecessary, and impractical weapons in the game. However, with an ammo console command (PC), this weapon can easily take down large groups of more powerful enemies (e.g. super mutants, Enclave, and deathclaws).
Behind the scenes
MIRV is a military term for Multiple Independent Reentry Vehicle (or Multiple Independently Targetable Reentry Vehicle). It is a collection of nuclear weapons carried on a single intercontinental ballistic missile (ICBM). Using a MIRV warhead, a single launched missile can strike several targets, or fewer targets redundantly. The MIRV system was developed throughout the middle of the 20th Century, and one of the main ideas behind the weapon system was to take out an enemy country with a single missile attack before the enemy nation could be able to respond.
- xbox360 Sometimes a graphics error can occur when detonation is very close. It can cause large, black rectangles to extend from the weapon out to as far as you can see. A console restart will fix this. [verified]
- xbox360 pc Sometimes when lifting the item, it will twirl around in the air, making it very hard to decorate your Megaton house or Tenpenny suite with it. [verified]