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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 characterEdit

Interactions overviewEdit

General Services Quests
Essential: yesIcon check
  • Always
Companion: noIcon cross
Merchant: noIcon cross
Repairman: noIcon cross
Doctor: noIcon cross
Rents bed/room: noIcon cross
Starts quests: noIcon cross
Involved in quests: yesIcon check



Apparel Weapon Other items On death
Courser uniform


  • X4 will turn hostile if you kill any of the synths you were supposed to capture.
  • If the Battle of Bunker Hill is not completed, and the player 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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