Fallout 4: Automatron DLC | SECRET ENDING – How to Skip Mechanist Fight Scene
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During the mission when you reach the mechanists lair you can find a terminal connected to an elevator pretty early on. You will need master lock to even attempt it along with 3 halotapes that are scattered throughout the building. Follow the video along to find all 3 then make your way back to the terminal and play all three in full. The elevator will unlock after that giving you the abiltiy to skip the fight scene and unmask the mechanist.