the one, where you have to destroy the Institute’s HQ.
it’s possible for you to become the enemy of the Brotherhood by, e.g.
attacking any of the Brotherhood soldiers, atCambridge Police Stationor atBoston Airport.
order it to be delivered by the robot merchant inGreygarden.
you might build, e.g.
new cannons or new traps there.
The attack ends in a success, e.g.
in the destruction of Prydwen.
What works best here is rocket launcher.
Sooner or later, this leads to fights on the ground.
Keep fighting up until the Castle defense bar reaches 100%.
Talk toPreston Garveyto complete this quest.
Rewards for completing the quest:Experience points.
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