Spoils of War Spoils of War is a Brotherhood of Steel main quest in " Fallout 4 " . Detailed walkthrough . Fly to Mass Fusion . Proctor Ingram explains that in order to fully power up Liberty Prime , they need a beryllium agitator . The only beryllium agitator available is located in the Mass Fusion building . Ingram insists that she should accompany the player character to get the agitator , because her technical knowledge will be essential for the mission . There is a Vertibird docked at the Prydwen that will fly to the roof of the Mass Fusion building when the player character is ready to go . Taking the Vertibird officially makes the player character get Banished from the Institute . As the Vertibird closes in on the Mass Fusion roof , a contingent of synths will open fire . Take out as many as possible with the Vertibird ' s minigun . Make use of the various explosive containers spread across the roof . After a period of time , the pilot informs the player character that the Vertibird has sustained a dangerous amount of damage and needs to leave . Jump to Mass Fusion ' s roof . At this point , the player character is given a prompt to disembark from the Vertibird and land on the roof . Clear out any remaining synths and head inside the structure . Locate the beryllium agitator . Go to the upper level and take the Mass Fusion executive lab password and ID from a desk . Access the marked executive research lab terminal - - either with the password or by hacking if the password was left on the desk - - and read the file from 07 - 30 - 77 to determine the location of the agitator . Retrieve the executive keycard . If the player character did not grab the ID before the previous step , leave the terminal room and take it from the desk on the left to complete this objective . The ID is needed to use the elevator that leads into the building . Proceed to the reactor level . Use the ID on the card slot in the elevator to activate it . After a short spectacle of riding the elevator down while overlooking the Boston skyline , the player character will load into the building ' s interior . While the elevator slowly descends , synths will teleport into the building on the various platforms around the room and attack the player character and Proctor Ingram . As the elevator approaches a glass floor , the synths will set off an explosion , knocking out the power and stopping the elevator . Next , the player character must reach the lobby either by reactivating the power and continuing to ride the elevator down , or by dropping down a hole in the floor and traversing to the bottom . If the player character chooses the latter , a number of synths will attack them along the way ; choosing the former avoids most of these encounters ( unless otherwise sought after the fact ) . The Strength bobblehead is located in the upcoming area . Once in the lobby , take care of the nearby synths and head to the left to find the marked elevator . Swipe the ID card to open the doors and ride down to the reactor level . After exiting the elevator , head to the right and down the stairs to the control room . Enter the reactor chamber . Removal of the beryllium agitator will trigger the security system , which consists of five ceiling - mounted turrets , a sentry bot , two assaultrons and two protectrons . If the player character cannot hack Master terminals , they may want to manually take out as many robots as they can access before going into the reactor chamber . Otherwise , they can hack the reactor security control terminal in the main control room . This terminal has the option to disable security , but it fails ; instead , use it to open the security doors . Go into the now - open room that contains the inactive sentry bot and access the facilities terminal inside to disable the security system . If the player character approaches Ingram , she will ask whether they have enough radiation protection on hand . Any answer given will lead to her giving the player character two Rad - Xs . Ingram indicates that there are probably some items lying around that can also help . There are three hazmat suits in the area - two regular , one damaged . One is in the locker room , on a locker ' s shelf . The other regular suit is on top of a safe in the office under the stairs next to the decontamination airlock . The damaged suit is in a drawer in front of the window of the airlock . Power armor is also a sufficient method of protection if the player character happens to be wearing it . Head into the airlock and press the button . The doors will shut and the player character will be sprayed , which will cure any radiation poisoning . After decontamination , the door to the reactor chamber will open . The player character will begin soaking up a lot of rads upon entering the chamber , so be prepared before continuing . Unlock the reactor . Walk up the scaffolding to the top of the room . Press the marked interlock release button to the right of the gray orb with blue lights in order to expose the agitator . Take the beryllium agitator . Take the agitator from its housing , which triggers the security system if still enabled . Exit Mass Fusion . Go back down the scaffolding and out of the reactor room . Press the button for the airlock and wait for the decontamination . Return to the elevator and take it back up to the lobby . As the elevator ascends , another explosion occurs . The Institute has sent reinforcements , but so has the Brotherhood of Steel . Ingram will tell the player character to leave with the agitator while she stays behind . The player character can either heed her advice and run for the exit , or stay and help finish off the synths . Return to Boston Airport . Leave the building and travel back to Boston Airport . Speak to Proctor Ingram . Once at the airport , speak to Ingram at the base of Liberty Prime to complete the quest . If Tactical Thinking is already finished , Ad Victoriam will begin . Otherwise , Ingram will take the beryllium agitator and store it until Ad Victoriam starts .