Masterbrain

Located in Vault-Tec Headquarters,  is a unique Robobrain that controls all the other security robots in that facility. The player can shut down Masterbrain using 3 terminals scattered throughout the building. It is also possible to disable it using the Robotics Expert perk, if you have a high enough sneak. Masterbrain will attack the player on sight. It is the only known Robobrain without a visible brain. As it would be a vulnerable target, Masterbrain's brain is likely armor plated, or alternatively, may be entirely cybernetic.

The Masterbrain also has a large Vault-Tec logo on its chassis.

If it is defeated, and you 'search' it, it will say: "You have accessed the Masterbrain's internal mechanism. If you destroy it's uplink, it will cause all the automated security units in vault-Tec to shut down." If you do so, this will disable all other robots in the Vault-Tec Headquarters building, but it will not disable the Automated Turrets.