The infobox template in this article is missing some required data. You can help Nukapedia by filling it in.
Interactions with the player character
|This character is essential. Essential characters cannot be killed.|
|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|
- 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.
Community content is available under CC-BY-SA unless otherwise noted.