Big Boy

The Big Boy is a unique weapon in Fallout 4.

Characteristics
The "Big Boy" is a Legendary Fat Man with the Two-Shot prefix, allowing it to shoot two mini nukes at once for the cost of only one, giving it the most damage potential from a single shot in the entire game.

The Big Boy is compatible with the Experimental MIRV mod; the Big Boy will shoot an astounding twelve mini nukes, while only consuming one. Be aware that the blast radius from shooting this is substantially larger than normal. Also, the cost of this weapon is astoundingly high (the most expensive item in the game), at around 14,000+ caps with no charisma and charisma related perks.

Variants

 * Fat Man

Locations
Can be bought from Arturo in the Diamond City market.