Mass Fusion (quest)

Mass Fusion is an Institute main quest in Fallout 4.

Quick walkthrough

 * 1) Speak with Allie Filmore.
 * 2) Relay to Mass Fusion building or Inform the Brotherhood.
 * 3) Locate the Beryllium Agitator.
 * 4) Retrieve the Executive keycard.
 * 5) Proceed to the reactor level.
 * 6) (Optional) Restore power to the elevator.
 * 7) Retrieve the Beryllium Agitator.
 * 8) Unlock the reactor.
 * 9) Take the Beryllium Agitator.
 * 10) Eliminate reactor level security.
 * 11) Exit Mass Fusion.
 * 12) (Optional) Assist Institute forces in the lobby.
 * 13) Speak with Allie Filmore.

Detailed walkthrough
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Behind the scenes
A beryllium initiator is used to generate neutron flux for starting nuclear fission reactions.

Bugs

 * The survivor can occasionally appear underneath of the rising elevator when taking it from the ground floor to the executive suite. You can use to get back onto the elevator.
 * There is an occasion when using elevator to proceed down to the underground sector where the beryllium agitator is, Allie Filmore will appear in the elevator in the exhausted state, even though she is at full health. This makes the situation become awkward as you have to proceed the quest alone from then on, to the last of the quest.

Mass Fusion