X1-91 is a synth courser working for the Institute in 2287. He was under repair in advanced systems at one point, with the completion date being pushed back a few additional weeks.[1]


X1-91 is mentioned only in Fallout 4.


  1. DialogueInstituteAlanaJustin3Scene - Alana Secord: "Just got an update on the repairs to X1-91. It's going to take a few more weeks."
    Justin Ayo: "Bastards are dragging their feet just to make a point."
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