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Gametitle-FO76 Steel Dawn.png
Gametitle-FO76 Steel Dawn.png

XB-55 is an Enclave sentry bot in The Enclave research facility.


XB-55 is a security unit programmed by the Enclave to protect SODUS from any who would try to harm her. During the destruction of the facility XB-55 was presumably left inactive. In 2103, when the Vault Dweller of Vault 76 - accompanied by Knight Daniel Shin and Paladin Leila Rahmani - enter SODUS's chamber, the AI will upload its programming into XB-55 and fight the trio.[1]

Interactions with the player character

Interactions overview

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This character is involved in quests.

Over and Out


Over and Out: SODUS uploads herself to XB-55 and acts as the end boss of the quest.


Apparel Weapon Other items On death


XB-55 appears only in Fallout 76, being introduced in the Steel Dawn update.


  1. Events of Over and Out.