Ancient Brotherhood disk

The Ancient Brotherhood disk is a holodisk

Location
It can be found on the first level of The Glow, on dead Brotherhood of Steel member D. Allen.

Behind the scenes

 * A man named "Camarillo" muttering about "Gehenna" is a reference to the World of Darkness tabletop RPG Vampire: The Masquerade.
 * An unused version of this disk exists in the game files as an honor code.