History of Keymaster

Overview

Keymasters are Cabal enemies that carry keycards, which open locked doors during a mission. They appear throughout the Lightfall campaign mission First Contact, where a Keymaster's keycard is needed to progress past each locked door.

Lightfall

In First Contact, Keymasters include several Keymasters, including a Centurion and an Incendior, each guarding a keycard that opens a locked door. Late in the mission, one Keymaster's key is needed to leave the ship, and a Colossus carries the key for the reactor fight instead.