You've got the iconic power armor, but you really need to be part of the Brotherhood of Steel. Here's how.
If you want to get in with the Brotherhood of Steel - either in the original Fallout 4, or in the new VR version - we're here to help.
The Brotherhood of Steel is the most iconic group in the Fallout universe, striding around in Power Armor and protecting the Commonwealth. They are the do-gooders, and you'll probably want to join them as soon as possible. Not least because once you do you get handed a tasty customised laser rifle.
Firstly, make sure you have started The First Step quest, which marks the Corvega Assembly Plant on your map. You don't need to complete the quest at this stage. Head over to the plant, and circle around the building. It's around here you'll pick up the Military Frequency AF95 radio signal. If you haven't started The First Step, head over to here on your world map:
You'll hear a distress call asking for help, which will mark the Cambridge Police Station on your map. This is the Fire Support quest.
Head over to the location. As you arrive you'll see Brother Danse in power armor fighting off a whole bunch of ghouls and a super mutant. Help him out (there's ammo here if you need it) and when he battle is over talk to him.
This will kick off the Call To Arms quest, and it's completing this that will result in an invite to join the Brotherhood. Go inside the police station and load up on ammo and anything else you can loot. Check out the Motor Pool for some extra ammo too. You can read Danse's diary on the computer here if you like. When you're ready, talk to Danse.
You're now going to get a Deep Range Transmitter from ArcJet Systems. Danse knows the way, so follow him out the station and along the shoreline where you'll run into a few ghouls. Danse tells you his story on the way and you'll be there in no time.
Inside ArcJet, have a look around, then arm a decent weapon before opening the twin doors. As they open you'll both be rushed by synths. These synthetic humans aren't too tough, but they can become overwhelming in high numbers so don't get cocky.
The good thing here is that even if you're not the toughest character at this point Brother Danse will do a lot of the work. He's rock hard. Both of you work your way down into the depths of the building to fix the elevator, fighting handfuls of synths on the way. At the bottom you'll have to fix the power. There's a fusion core here, so make sure you pick that up before cracking the computer terminal.
As soon as the power is back on a shit-tonne of synths will drop down into the main room. Danse stays there and fights them, but you're better off using the corridor for cover and attacking from the corner. If you step into the main room you'll likely get cut to ribbons by laser fire. There's a lot of bad guys.
Once they're all dead, ride the elevator up to the control room and kill the rest of the synths. Search the bodies to find the Deep Range Transmitter, then take the next elevator up and outside.
How to get Righteous Authority
Talk to Danse to compete the task and it's at this point he will gift you his modified laser rifle, Righteous Authority.
He will also now ask you to join The Brotherhood of Steel, which initiates the Sempa Invicta quest. Say yes and meet him back at the Cambridge Police Station. Congratulations, you are now a member of the Brotherhood of Steel!