Want the Enclave's X-01 power armor for your Sole Survivor in Fallout 4? Here's what you need to do.
First, you need to be at least level 28 and head to the Custom House Tower in Boston.
Nearby there's a building with a sign out front reading '35 Court'. There'll likely be a few raiders and Gunners outside and you may want to put on a hazmat suit or take some Rad-X as the Gunners come equipped with Gamma Guns, which shoot out radiation damage.
Two laser turrets are also placed over the door.
Head inside and you'll find a lobby area, the door to the right offers a hackable terminal and a safe which you can open with the computer or pick the lock of. There's also a Protectron here. Take the elevator up to an open area protected by a sentry bot and an assaultron.
You can lure the robots towards you by heading down the slope in the corner. Be careful, as you can actually fall through the hole in the hall if you walk back too far, you won't die if you fall out of the building but you'll either need to reload or make your way back up. Once they're both dealt with, push both of the red buttons in the small rooms they came out of and this will open a door leading to a complete set of X-01 power armor.
If you find or make a headlamp mod you can add it to the helmet so your eyes appear to glow.
You can also find randomly generated pieces of the suit in the armory in the National Guard Training Yard but if you want the full set, you'll have to come here.
For those of you who may not be aware, the Enclave was the remnants of the US government in the aftermath of the Great War of 2077 and unlike other power armor suits in the game, the X-01 was actually developed after the bombs fell and is stronger than those that came before it.