Carl's Fallout 4 Guide
for PC, Xbox One, and PS4

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Fallout 4 Mass Fusion

Choices - Finishing with Institue or Brotherhood

Mass Fusion in Fallout 4 The Mass Fusion Building in Fallout 4

The Mass Fusion Quest takes part after Makind-Redefined when pursing the Institute Quest line. It is a moment of decision-making for the player, as if you continue you will get yourself kicked out o the Brotherhood of Steel, who also want the Beryllium Agitator found at the Mass Fusion building. They have a similar version of this quest called, "Spoils of War". Additionally, alerting the Brotherhood will result in you being banished from the Institute, and thus unable to complete the game with that faction. Similarly, doing Spoils of War will result in you being kicked out of the Institute.

Should you inform the Brotherhood of Steel during the Mass Fusion quest in Fallout 4 Informing the Brotherhood may be desireable, see the possibilities of doing so below.

To continue the quest, choose between:

Getting to this point in the Institute quest line is one way to avoid tough choices you face in the BoS quest line, as you can skip the quest Blind Betrayal as well as Tactical Thinking, both of which will potentially permanently remove you from a faction and/or strike a companion from your roster. You may want to do this if you'd like to leave more factions intact toward the end of the game. This skips those choices with ramifications on your relationship with Danse and the Railroad.

From here on, I'll assume you've chosen to continue doing this the Institute way, so that you can see the rewards this quest offers and any good things you can find along the way.

Relay to Mass Fusion

How to relay to mass fusion in Fallout 4 Head to the top level of the Institute to automatically relay to the top floor of the Mass Fusion building. Doing so immediately cuts your ties to the Brotherhood of Steel.

Head to the Institute, then take the elevator directly up to where you first entered. Once you go inside the relay room, you'll be informed choosing to relay will instantly make you enemies with the Brotherhood. From a story standpoint this makes sense, as they want the same thing out of this building and you're helping the enemy. You can choose to back out at that point if you so desire.

Fighting the brotherhood in mass fusion building An intense fight begins immediately. There's no shortage of enemies in this building.

Once you relay to Mass Fusion you can expect instant resistance from leveled Brotherhood soldiers, both in and out of Power Armor. Since you may not have fought many BoS in Power Armor if youv'e just now become hostile to them, it can be a challenge given their high armor values. You can use jet to get behind them and target fusion cores, while also using critical hits on the cores so long as you can get the required 1% chance to hit by flanking them. Of course, you can also use head shots as usual.

Key card and required password in Mass Fusion building. You'll need the password and key card found in this desk to proceed.

Once the first fighting is done, head inside and up the stairs to this desk to get the executive terminal password and keycard. Jumping across the broken floor will lead you to the room with a large computer, where you can use the executive password to read the first mail and find the Agitator is on the first sublevel of the building. Use the key card reader in the nearby elevator to go down.

Go up the broken floor and use it as a ramp (you need to jump) and you'll find a Tesla Science magazine on the opposite side.

The Brotherhood will shoot at you as you descend, but you can easily fight back. Kill the weaker members first to lower incoming damage, then focus on any enemies in power armor. They will cut the power and you'll need to finish off the remainder of the ambush.

Lab Key and Terminal used to restore power to the elevator Look for the lab key here. The terminal can be used to restore power and head to the bottom level if you've already got the Strength Bobblehead in a previous visit. Be sure to also get the Tesla Science magazine near this level.

You have three options here: use the expert-level terminal through the door to the right to restore power, head up a broken floor (ramp) to use the fuse box and restore it that way, or get the labs key off the terminal desk to decend the stairwell. Heading up the ramp is a good idea anyway, as you can find an issue of Tesla Science as well as an Expert-level safe that can be picked.

If you've not yet acquired the Strength Bobblehead, you might as well take the door unlocked with the lab key (where you fall down a level) as opposed to the elevator so that you can grab it. It involves some fighting, but you'd have to fight your way up otherwise and it's better to hold the high ground in any fight.

Strength Bobblehead location in the Mass Fusion building in Fallout 4 The Strength Bobblehead location is atop this statue. Climb up on the couch and carefully grab it from the statue's head.

If you've taken the lab path down and haven't been to Mass Fusion before, get the Strength Bobblehead from off the back of this statue just after dropping down a level. Climb up the couch and it'll be on top of the statue's head, though I had already grabbed it on a previous trip, it should be there for you!

Open the door marked Mass Fusion Balcony and continue your path downward toward the main lobby, which will require some maneuvering through doors and spotting broken floors to continue. Once you've reached the floor with the large globe statue, you're ready to proceed to the reactor level.

To the Beryllium Agitator

The reactor level where the Beryllium Agitator is found in Fallout 4's Mass Fusion Quest To the reactor level! Beware high levels of radiation.

Fight to the lobby, and you'll be ready to proceed to the sublevel where the biggest challenges await. Mass Fusion were very good about security and have Sentry Bots, Assaultrons and Protectrons to guard the reactor. There is no fighting initially, but you may want to save in case things go very badly for you.

Hazmat suit in Fallout 4 Get a hazmat suit from the locker room unless you're wearing Power Armor.

Before going all the way to the reactor, note that there is high radiation that can kill you. Hazmat suits can be found in the locker room if you take the stairs down to the left. Do not drink the water here, either as it is highly irradiated and not worth it. If you talk to Allie Filmore here, she will give you two Rad-X if you tell her you do not have radiation protection. Since they're useful, there's no harm in a little lie. Rad-X increases radiation resistance by 100 for 3 minutes and is stackable, meaning you can pop 4-5 if you like and get 400-500 radiation resistance. Don your hazmat suit, or proceed normally if you have Power Armor.

This reactor in the Mass Fusion building houses the Beryllium Agitator you need for the quest This reactor in the Mass Fusion building houses the Beryllium Agitator you need for the quest

When you pull the Beryllium Agitator from the reactor, alarms will go off and the robotic security will kick into full gear. Head back out to the decontamination room, and when the cleaning is complete and you can exit, take off the hazmat suit immediately unless you're wearing Power Armor.

While the Sentry Bot is a challenge, the Assaultrons can be worse. Aim for the legs to make the fight a bit easier. Do NOT aim for Assaultrons' heads. It deals LESS damage.

After a tough fight with a Sentry Bot, two Assaultrons, Protectrons and turrets, you should be free to leave. To deal with Assaultrons in such close quarters is not easy - aim for the legs to take them to the ground, and avoid head shots as they take much less damage (33%) when shot in the head. Their weak limbs are the go-to for dispatching them quickly. The Sentry bot is a pain, but Ally Filmore may tank it for you, allowing you to - again- focus on the limbs. Do NOT be near to it when you deal the finishing blow, because they detonate when destroyed and it's like a mini-nuke.

With the Agitator in hand, you can now proceed back to the lobby. It's likely Synths and BoS will be fighting it out - I'd take the chance for some extra kill XP and ammo, especially if there's a Legendary Enemy among the Brotherhood. You can simply exit if you like and return to the Institute to complete the quest.

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For the rooms in the basement, if you hack a few terminals you can fight the assaultrons and sentry bot separately and on your own terms. I activated the sentry bot and sneak attack sniped him from cover before he even started moving. Just a tip to make it a little easier.
25th October 2018 6:28pm
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Far Harbor DLC Guides

See my Far Harbor Guide for new features in the DLC. There, you can also watch the trailer and view new weapons that can be found. The area is massive, so we can expect plenty of quests and exploration in a foggy, rugged area with new and challenging creatures to battle.

Pleae note there are different endings for this DLC, something we all wanted! It's like the actual end-game of FO4 in that you can choose the outcome.

Islander's Almanac Magazine Locations
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Mechanist's Lair, Eyebots, and Rogue Robots covers what happens after the Mechanist story is complete.

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