|The following is based on Fallout: Brotherhood of Steel and has not been confirmed by canon sources.|
It's one of the most powerful weapons in the game, and can be obtained very soon if you know where to look.
Beware, if you equip it, you cannot dodge.
With a few modifications, this weapon uses pre-loaded explosives bathed in blood and so it needs no ammunition. It shoots five explosives at the same time and causes considerable damage to anyone standing near the impact point, even the player.
To find this, you must leap into the dark void just to the east of the last save game terminal near the level's exit. You will not die and you must continue straight on towards a destroyed bridge. A little farther from it you will find a few ghouls, you must kill them and loot the footlocker near the ice cream truck.
- Los Bridge East, found in footlocker on hidden island.