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X4-18 is an Institute courser in the Commonwealth in 2287.


X4-18 is sent to Bunker Hill to aid the Sole Survivor in apprehending the runaway synths hiding there during the quest, The Battle of Bunker Hill.

Interactions with the player character

Interactions overview

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This character is essential. Essential characters cannot be killed.
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This character is involved in quests.


  • The Battle of Bunker Hill: X4-18 is waiting for the player character to help him and the Institute recapture the synths at Bunker Hill.


Apparel Weapon Other items On death
Courser uniform


  • X4 will turn hostile if the player character kills any of the synths they were supposed to capture.
  • If The Battle of Bunker Hill is not completed, and the player character has not sided with the Institute, X4 can be found wandering around Bunker Hill.


X4-18 appears only in Fallout 4.

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