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What were the long-term effects of finishing the game with one of the four factions? More specifically I was wondering about becoming allies with the Institute. Will the people of the Commonwealth be unhappy and hate me? What about your companions?

This question is for all of the four factions (Institute, Brotherhood, Railroad, and Minutemen), but I'm really more interested in the effects of ending the game with the Institute.

  • @ForgottenMaiden Thank you for the edit/clarification! Unfortunately modifying a question with some input is not the preferred method of adding information to an answer, but I appreciate the sentiment :) – Jonathan Pitre Mar 14 '16 at 13:11
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I have limited experience since I'm only on my second playthrough however so far I have observed -

If you join the Minutemen you'll end up allied with the Railroad and will end up destroying the Brotherhood of Steel and the Institute.

Additionally, if you've progressed through the Minutemen missions (upto and including retaking the castle) then during the mission where the Institute attempt to "invite" Wallace to join their Biosciences team it will be the Minutemen that respond to Wallace's distress call (thus giving you the opportunity to talk them out of it). If you haven't joined the Minutemen, the Gunners will turn up to respond to Wallace's call for help. Progressing through the Minutemen story will also result in numerous groups of wandering Minutemen patrolling the wastelands in addition to unlocking artillery.

If you join the Brotherhood of Steel, you'll declare war against the Institute and Railroad while being allied with the Minutemen.

If you join the Railroad you'll be allied with the Minutemen and destroy the Brotherhood of Steel and the Institute.

If you join the Institute you'll be allied with the Minutemen and destroy the Railroad and the Brotherhood of Steel.

After completing the storyline allied with the Institute, groups of synths start showing up all over the commonwealth announcing that the Institute is now in charge - they'll also set up a variety of checkpoints and roam the wastelands killing mutants and raiders. The various companions I used during my playthrough didn't mind that I had sided with the Institute however I expect that Deacon and Danse might (since you destroyed their factions).

Regardless of which choice you make,

"Father" will die, however the cutscene will be different if you aren't allied with the Institute. If you attack the Institute you'll lose that as a fast travel location. Any factions that you wipe out will not be available for missions after the final cutscene.

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    Which means that the Minutemen always win ... Makes me wanna try a run without ever going to Concord, to see what it is possible to prevent the rebirth of the Minutemen and what it means to the story (if it's even possible). Because I suppose Garvey is tagged as essential at all times and thus immortal -_- preventing me from destroying them. – Autar Nov 19 '15 at 14:07
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    @Autar I've almost done that, one of my playthroughs I went to concord but had zero interaction with the minutemen after that point. I joined BoS and there was no mention of the minutemen that I can recall - I wonder if the alliance only happens / gets mentioned if you progress with minutemen and another allied faction. – jammypeach Mar 8 '16 at 20:59
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Actually you can have the Minutemen and the Brotherhood of Steel work together. In my playthrough I initially joined the Minutemen. Then when the Brotherhood asked me to go towns and get them "compliant" I only did the initial town Sanctuary. This flipped it and turned me back on the Minutemen's side.

In the ending, the Brotherhood decided to align themselves with the Minutemen and "use them as cannon fodder" to take out the Institute in order to minimize casualties to their own men.

protected by Community Nov 25 '15 at 23:41

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