Call to Arms

Call to Arms is a Brotherhood of Steel main quest in Fallout 4.

Detailed walkthrough
Paladin Danse asks you to follow him to ArcJet Systems where he hopes to get his hands on a deep range transmitter to repair the Brotherhood of Steel communications array.

Once you've agreed to assist Danse, he will order Scribe Haylen and Knight Rhys back into the police station. Follow them into the police station, where Danse offers you the option to "resupply yourself" i.e. grab everything good in sight. After optionally talking to Scribe Haylen or Knight Rhys, tell Danse that you're ready to head out.

Follow Paladin Danse west to the abandoned ArcJet Systems building. Alternatively you can simply meet Danse at ArcJet Systems, but by doing so you will likely miss scripted encounters along the way, and along with them the opportunity for loot and XP. As Danse first reaches the river shore road, you will find a pile of ghoul and raider bodies which was not there before, along with two active frag mines. Then, a group of raiders will be found ambushing some traders under the railroad bridge: after the fireworks are over, the pack brahmin in particular usually contains excellent loot. Note that these bodies will all despawn as soon as you leave the area, so your only chance to obtain this loot is during the trip to ArcJet. Further along, you may be attacked by various local dogs and insects before finally reaching the ArcJet building.

After a chat about the transmitter and automated security, provide fire support for the Paladin. He is dismayed to discover the presence of Institute Synths. Head into the lab analysis room.

Here you have the option to: Hack (Advance) into the lab control terminal or use the lab analyst's terminal to receive the lab control terminal password.

Use the lab control terminal to open the door, and the two of you will now begin fighting your way through numerous synths. When you reach the second floor corridor just outside the CEO's office, you can fight through the turret-lined hallway with Paladin Danse, or head into the server room nearby and use the terminal to disable them. Follow Paladin Danse to the elevator leading down to the ArcJet engine core.

Paladin Danse and you need to reach the top of the engine core in ArcJet Systems, but first you will have to search for a way to restore power to the access elevator. You can access the facilities terminal (Novice) and hacking it. Start the auxiliary generators before returning to help Paladin Danse with his synth problem.

Alternatively you can press the Engine Start button on the Engine Core panel and watch the synths fry, noting that waiting longer before frying the synths will result in a higher body count for subsequent looting. Check on Paladin Danse, who will prove stunned-but-unhurt by the rocket blast, and then head to the elevator and ascend.

Battle to the control room and secure the Deep Range Transmitter off the corpse of a synth then leave the facility via the control room elevator. Outside, Danse will reward you with Righteous Authority and offer you the chance to join the Brotherhood. Whether you join or not at this time, he will subsequently be found back at the Cambridge Police Station, where additional quests can be obtained from him, Haylen, and Rhys if you do choose to join.

Bugs

 * After Paladin Danse notes that there are turrets up ahead, he might turn around and head back in the direction you came, eventually coming to a stop and not moving at all. To get the quest to progress, destroy the turrets, and Danse will resume heading in the direction he is supposed to.
 * If this quest is not completed before Reunions and The Prydwen shows up, it will trigger a glitch that not all Brotherhood vertibirds and patrols will spawn correctly.
 * After you finish the quest and head into the service elevator, the elevator door might not open, leaving you stuck in there. PC users can fix this issue by opening the console once they are trapped in the elevator and typing "CompleteQuest 001A7BD2", without quotes. Note that this may cause excessive lag afterwards, in which case, open the console again and type "PCB", without quotes.
 * The terminal found in the room with the Fat Man is mislabeled as an Expert level hack, when in reality it is a Master level.
 * Finishing stage 290 (Clear the control room) adds 1 to the Crime/Murders statistic.

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